Frosty, the Lemmon

When one first encounters this title with its unexpected play on words, we wonder what the author had in mind.   Of course, most of us know that at Christmastime, we are often regaled by a Christmas tune called, “Frosty the Snowman1“.   But here, we are surprised as we continue reading the title that instead of encountering the word, “snowman,” we encounter the word “Lemmon!”  Hah!

What is meant here?  What is author trying to tell us? Perhaps the word, “lemon”,  has been misspelled.   But if so,  why would a “lemon” be frosty?  Perhaps there was a cold spell in Florida and the author is harkening the reader to a long ago memory.  Or, perhaps misspelling “lemon” was a literary device to emphasize that word in an eccentric way.

Yet, upon further investigation, we find that the issue is more complexed than first imagined.  We find that there was an art teacher, nurse, and eventually, a self-educated botanist from New England, Sara Plummer Lemmon, who, with her husband and another worker, hiked to the top of the Catalina Mountains right here next to us, and while doing so, they logged the vegetation that was unique to the area.  In their excitement when reaching the top, they named that highest peak after Mrs. Lemmon.

So, what does this piece of history add to our literary dilemma encapsulated in the title?

Perhaps Mrs. Lemmon did some work in the field of glaciology as well, hence, the word “frosty” as a possible hint of that work.  Yet, upon investigation,  we find no mention of work on ice crystals, hoar frost, nor glaciology not only in the work of Mrs. Lemmon, but neither in the work of any the team that mounted what is now known as Mt. Ms. Lemmon.   We add that the note that the Lemmons, J. G. and Sara,  were on their honeymoon at this time, historians tell us.  Perhaps there is another avenue we can explore due to that latter element.

Could it be, too, that we are missing a characterization of Ms. Lemmon by our author?  Perhaps she was shy,  seen inadvertentlhy as “cold” by some, or was not particularly interested in the physical advances of her husband, J. G.  The word “frosty” alert may be alerting us those possibilities.

Ultimately, we remain perplexed by this title; it forms an enigma that may never be confidently resolved.

But then good titles,  and good books, are supposed to make us think,  try to imagine what the author is telling us through his/her use of metaphor and other literary devices, and  this title has done that.

We, of course, reject the most plausible, superficial explanation, that the author’s play on words was merely describing a local, snow and rimed-tree mountain named after Ms. Mt. Lemmon,  as in the photo below.  No, Occam’s Razor, the idea that the simplest explanation is usually the best one, will not do.

4:43 PM.
4:43 PM.  Those trees are rimed, like the airframe of an aircraft that collects drops that freeze and cause icing.  Here the wind blowing across the mountain top, and cloud droplets that were below freezing, hit the trees and froze over a period of many hours, creating this scene.  Its not snow resting on the branches.  That would’ve blowed off in the strong winds up there.

———End of Literary Criticism Parody Module———-

There was a rousing 0.24 inches of rain yesterday!  Our storm total has topped out at 0.89 inches!

In other photos from yesterday:

9:42 AM.  Altostratus translucidus again, this time with bulging Stratocumulus giving portent of a good Cumulus day if the As clouds will only depart.  They did.
9:42 AM. Altostratus translucidus again, with a few scattered Altocumulus cloud flakes, but this time with bulging Stratocumulus topping Samaniego Ridge, giving portent of a good Cumulus day if the As clouds will only depart and allow a LITTLE warmth.  They did.

 

10:24 AM.  Before long, cloud bases darkened here and there, indicating mounding tops above a general layer, and with the low freezing level of about 7,000 feet, the formation of ice and precip was not far behind.
10:24 AM. Before long, cloud bases darkened here and there, indicating mounding tops above a general layer, and with the low freezing level of about 7,000 feet, the formation of ice and precip was not far behind.
10:51 AM.  Mountain obscuring showers were soon in progress due to both a little warming, but also because of a cloud energizing swirl in the upper atmosphere that passed over us at 1 PM AST.  Did you notice that windshift aloft as that bend in the winds went by up there?  You probably noticed that it was no dice, er, no ice, after 1 PM as the mash down of air that follows "troughs" did that very effectively after 1 PM.
10:51 AM. Mountain obscuring showers were soon in progress due to both a little warming, but also because of a cloud energizing swirl in the upper atmosphere that passed over us at 1 PM AST. Did you notice that windshift aloft as that bend in the winds went by up there? You probably noticed that it was no dice, er, no ice, after 1 PM as the mash down of air that follows “troughs” did that very effectively after 1 PM.

 

10:52 AM.  As the clouds (weak Cumulonimbus ones) broke, there was a fantastic rainbow for just a seconds to the north, landing on my neighbor's house.
10:52 AM. As the clouds (weak Cumulonimbus ones) broke, there was a fantastic rainbow for just a seconds to the north, landing on my neighbor’s house.  It was even better before this, but was slow getting to the camera!  Dang.

 

10:54 AM.  Pictures a poppin' now as breaks in clouds allows highlights of glinting rocks and scruffy Stratus fractus or Cumulus fractus clouds lining Sam Ridge.
10:54 AM. “Pictures a poppin’ ” now as breaks in clouds allows those fabulous highlights of glinting rocks and scruffy Stratus fractus or Cumulus fractus clouds lining Sam Ridge, those highlight scenes that we love so much when the storm breaks.  And these scenes change by the second, too!

 

11:00 AM.
11:00 AM.
Also 11 AM.  Out of control with camera now.....
Also 11 AM. Out of control with camera now…..

 

11:12 AM.  Meanwhile, back upwind...  This line of modest Cumulonimbus clouds fronted by a weak shelf cloud roared in across Oro Valley to Catalina.  What a great sight this was since now there was a chance of some more decent rains!
11:12 AM. Meanwhile, back upwind… This line of modest Cumulonimbus clouds fronted by a weak shelf cloud roared in across Oro Valley to Catalina. What a great sight this was since now there was a chance of some more decent rains!  Before long, the rains pounded down, puddles formed, and another 0.18 inches had been added to our already substantial total of 0.65 inches.

 

12:01 PM.  But that wasn't the end, was it?  Before long, a heavy line of Cumulus and weak Cumulonimbus clouds formed again to the southwest and drenched Catalina with another round of rain, this time, only 0.06 inches.  And with it came the End.  This line of showers was spurred by that upper level wind shift that was going to occur over the next hour.
12:01 PM. But that wasn’t the end, was it? Before long, a heavy line of Cumulus and weak Cumulonimbus clouds formed again to the southwest and drenched Catalina with another round of rain, this time, only 0.06 inches. And with it came the End. This line of showers was spurred by that upper level wind shift that was going to occur over the next hour.

 

1:01 PM.  Sometimes those clearing skies, the deep blue accentuating the smaller Cumulus clouds provide our most postcard scenes of the great life we have here in the desert.
1:01 PM. Sometimes those clearing skies, the deep blue accentuating the smaller Cumulus clouds provide our most postcard scenes of the great life we have here in the desert.
2:13 PM.  While it was sad looking for ice in the afternoon clouds and finding none, the scenes themselves buoyed one.
2:13 PM. While it was sad looking for ice in the afternoon clouds and finding none, the scenes themselves buoyed one.  The instability was great enough that even brief pileus cap clouds were seen on top of our Cu.
2:21 PM.  Pileus cap cloud (right turret) tops honest-to-goodness December Cumulus congestus cloud.  No ice nowhere.
2:21 PM. Pileus cap cloud (right turret) tops honest-to-goodness December Cumulus congestus cloud. No ice nowhere.

 

2:28 PM.  And if the sky and mountains splendor isn't enough for you, then consider our blazing fall-winter vegetation as evidenced by a cottonwood tree in the Sutherland Wash, that yellow dot, lower center.
2:28 PM. And if the sky and mountains splendor isn’t enough for you, then consider our blazing fall-winter vegetation as evidenced by a cottonwood tree in the Sutherland Wash,’ that yellow dot, lower center.  We have it ALL now!
2:48 PM.  And, as the cloud tops are kept low, we get those fantastic, quilted, rich color scenes on our Catalina Mountains.  Here, looking toward Charouleau Gap.
2:48 PM. And, as the cloud tops are kept low, we get those fantastic, quilted, richly colored scenes on our Catalina Mountains we love so much.  Here, looking toward Charouleau Gap and Samaniego Peak.   I could show you so many more like this from just yesterday!

 

5:08 PM.  Even our lowly regarded teddy bear chollas have luster on days like this, the weak winter sunlight being reflected off its razor-hook-like spines.
5:08 PM. Even our lowly regarded teddy bear chollas have luster on days like this, the weak winter sunlight being reflected off its razor-hook-like spines, ones that many of us know too well.

 

5:12 PM.  And like so many of our days here in old Arizony, closed out with a great sunset.
5:12 PM. And like so many of our days here in old Arizony, closed out with a great sunset.
 Possibility raised in mods for giant southern Cal floods, maybe some flooding in AZ floods, too

Something in the spaghetti plots has been tantalizing as far as West Coast weather goes.  They have been consistently showing a stream of flow from the tropics and sub-tropics, blasting into the West Coast.  Recall that yesterday, that tropical flow was so strong and so far south, that at least one major gully washed was shown to pass across central and southern California on New Year’s Day, but weaken and shift to the north of southern AZ after that.

Well, my jaw dropped when this model run from yesterday at 11 AM AST came out, re-enforcing, even raising the bar on flooding, in central and southern California, and with those stronger storms, the possibility of flooding and major winter rains here in Arizona was raised.  The severity of the pattern shown aloft is not one I have seen before, and for that reason alone,  might be considered somewhat of an outlier prediction, one really not likely to occur.

Now, while there is some support in this model flooding “solution” in the spaghetti plots, the main reason I am going to present a series of what a disastrous Cal flood looks like is just FYI and how it develops.  The closest analog to this situation was in January 1969 when a blocking high in the Gulf of Alaska (GOA), forced the major jet stream far south across the central and eastern Pacific on several occasions producing disastrous floods in southern California in particular, where one mountain station received more than 25 inches of rain in ONE DAY!

Also that blocking high in the GOA in Jan 1969 also forced unusually cold air into the Pac NW, where Seattle (SEA-TAC AP) accumulated 21 inches of snow over the month, still a record.

Here we go, in   prog maps of our WRF-GFS rendered by IPS MeteoStar:

In the Beginning, the blocking high, shunting the jet stream to the south and to the north takes shape in the GOA.  Note low far to the south between Hawaii and southern California.  Get sand bags out now!
In the Beginning, the blocking high, shunting the jet stream to the south and to the north takes shape in the GOA. Note low far to the south between Hawaii and southern California. Get sand bags out now!  This is for 11 PM AST, 28th of December.

24 h later:

Valid at 11 PM AST 29 December.  Southern Cal flooding underway.
Valid at 11 PM AST 29 December. Southern Cal flooding underway.  Cold air pocket in Oregon has slipped southwestward helping to energize the lower band of jet stream winds by bringing cold air out over the ocean.  The greater the temperature contrast between the north and the south, the greater the speed of the jet stream between the deep warm air to the south, and the deep cold air to the north.  Note, too, high is getting farther out of the way in the Gulf of Alaska.

The situation continues to strengthen, and leads to this Coup de Gras, 11 PM AST January 1st.  A system this strong barging into southern Cal is mind-boggling, and this panel is what brought this part of the blog, to show you what a devastating flood in that area would look like:

Valid at 11 PM, January 1st.  In my opinion, I doubt the Rose Bowl game between the Oregon Ducks and Florida State would take place.
Valid at 11 PM, January 1st. In my opinion, I doubt the Rose Bowl game between the Oregon Ducks and Florida State would take place in Pasadena, CA, if this were to transpire.

Now for AZ.  Here’s the prog for 12 h later, 11 AM AST January 2nd, Cactus Bowl Day in Tempe, AZ between the Washington Huskies and the Oklahoma A&M Aggies, to continue with sport’s notes here.  Rain would be expected for that game should this pattern persist:

Valid at 11 AM AST, January 2nd.  This is an unbelievably strong wave that has roared in from the lower latitudes of the Pacific.  While it rushes through Arizona in a hurry, heavy rains, and some flooding are likely should things transpire like this.
Valid at 11 AM AST, January 2nd. This is an unbelievably strong wave that has roared in from the lower latitudes of the Pacific. While it rushes through Arizona in a hurry, heavy rains, and some flooding are likely should things transpire like this.

Now for a gee-whiz, scary analog….one from WAY back in the winter of 1861-62 when the situation decribed above was likely very similar to what it was in that terrible flood; severe cold in progress in the Pac NW, as it would be in the upcoming situation; a tropical torrent raging in from the Pacific.   This 1861-62 flood episode is still remembered.  However, it went on for 30-40 days (!) with recurring episodes turning much of California’s central valley into a lake, Los Angeles area, too, where there was a report of 35 inches of rain in 30 days.

What’s ahead, really?

Well the models are going to fluctuate on the strength of this breakthrough flow “underneath” the blocking high in the Gulf of Alaska.   But almost certainly one major rain event will break through as that this happens.   Its kind of a fragile flow regime, so it usually doesn’t last long.

Whether it will be stupefyingly historic,  or just another ordinary southern Cal gully washer, can’t be pinned down.  But, if you lived down there, you’d want to be looking around and seeing what you could do to divert water, fix a roof, etc.

There would be strong, damaging winds with one of these “coming-in-underneath”, too, and, for surfers,   giant waves!

Interesting times ahead!  “Floodmagedon”, as we like to say these days?

No real weather here for awhile, except around Christmas when a mild cold snap, and a little chance of precip occurs as a cold front goes by.

The End, for awhile.

—————————–

1The most intellectually satisfying version of “Frosty the Snowman” was, of course, has been rendered by Bob Dylan.

Ice cream “Sunday” with a pileus topping

Yesterday’s cloud of the day:

DSC_0045-1

6:20 PM. Cumulonimbus calvus pileus. Hope you had your camera. This would have been a good example to add to your collection.  “Calvus” or “bald” is a short-lived period when a Cumulus congestus top is converting to a fibrous (“capillatus”) appearance.  That left bulge is clearly loaded with ice.  The pileus forms in moist air being pushed up by the rising turret below it.  I wanted to be inside that cloud so bad!  There’s real magic going on when the droplets are being converted to ice, along with the appearance of hail and/or its soft, squashable version, graupel.

DSC_0046

 Fantasy storm of the day

….popped out of the WRF-GFS run from 12 Z yesterday, rendered,  as we say, by IPS MeteoStar.  Tropical storm “Q” is shown in the Gulf of Cal/Sea of Cortez racing north into Arizona.  Pretty cool, huh?

A map configuration like this hasn’t been back yet, and wasn’t there in any run before this one, so we can throw it in the trash pile of bogus model predictions so far, though the models DO have a strong hurricane “Q” in the works. Mods now show it going NW and out to sea off Baja.  Still its fun to see how much fantasy rain can fall in Arizona.  Kinda reminds one of the track of infamous Tropical Storm Octave, October 1983, almost passing over Tucson on the same day 31 years ago.  You remember “Octave” I am sure.  You can read about it and a very similar eastern Pacific hurricane season to this one here.

Valid October 1st at 5 PM AST.  Flooding rains from tropical storm "Q" move into Arizona.
Valid Wednesday, October 1st at 5 PM AST.  Flooding rains from tropical storm “Q” move into Arizona.

The Cumulus ahead

Whilst CMP was glumly anticipating the end of Cumulus clouds, tropical ones on a daily basis anyway, due to the onset of westerly winds aloft, it has been pointed out by more astute forecasters, like forecasting legend, Mike L, at the U of AZ, TEEVEE ones, NWS, etc., (i e., namely, everyone else who knows anything at all about weather) that tropical air will still be feeding in enough from the east below the westerlies to keep some Cumulus going here and there, some even becoming Cumulonimbi with rain! Your errorful CMP was actually glad to be “informed”, glumness disappearing.

Also, we got that cold front coming on the 27th or so, with another chance of rain as humid air is drawn northward ahead of it. So, another coupla chances to make this a decent water year, one that ends on September 30th. We’re just surpassing 15 inches now; the normal, computed from 37 years at Our Garden here in Catalina, is a little less than 17 inches.

The End

More like it; 0.43 inches in The Heights, 3.07 inches on Ms. Mt. Lemmon!

Thank you,  second burst of rain after about 8:15 PM.   And what a great total on The Lemmon!  Fantastic, unless some roads were washed out.  1.93 inches fell in only an hour up there.  1.85 inches fell in an hour at White Tail over there by the highway.

Below, cribbed from the Pima County ALERT gauge line up, these 24 h totals, ending at 4 AM AST:

Catalina Area
    1010     0.00       0.00       0.00        0.00         0.28      Golder Ranch                 Horseshoe Bend Rd in Saddlebrooke
    1020     0.00       0.00       0.00        0.00         0.28      Oracle Ranger Stati          approximately 0.5 mi SW of Oracle
    1040     0.00       0.00       0.00        0.00         0.43      Dodge Tank                   Edwin Rd 1.3 mi E of Lago Del Oro Parkway
    1050     0.00       0.00       0.00        0.00         0.43      Cherry Spring                approximately 1.5 mi W of Charouleau Gap
    1060     0.00       0.00       0.00        0.00         0.55      Pig Spring                   approximately 1.1 mi NE of Charouleau Gap
    1070     0.00       0.00       0.00        0.04         0.87      Cargodera Canyon             NE corner of Catalina State Park
    1080     0.00       0.00       0.00        0.00         0.24      CDO @ Rancho Solano          Cañada Del Oro Wash NE of Saddlebrooke
    1100     0.00       0.00       0.00        0.00         0.51      CDO @ Golder Rd              Cañada Del Oro Wash at Golder Ranch Rd

Santa Catalina Mountains
    1030     0.00       0.00       0.00        0.00         0.75      Oracle Ridge                 Oracle Ridge, approximately 1.5 mi N of Rice Peak
    1090     0.00       0.00       0.00        0.04         3.07      Mt. Lemmon                   Mount Lemmon
    1110     0.00       0.00       0.00        0.00         0.63      CDO @ Coronado Camp          Cañada Del Oro Wash 0.3 mi S of Coronado Camp
    1130     0.00       0.00       0.00        0.00         1.69      Samaniego Peak               Samaniego Peak on Samaniego Ridge
    1140     0.00       0.00       0.00        0.00         0.94      Dan Saddle                   Dan Saddle on Oracle Ridge
    2150     0.00       0.00       0.00        0.04         2.72      White Tail                   Catalina Hwy 0.8 mi W of Palisade Ranger Station
    2280     0.00       0.00       0.00        0.00         0.59      Green Mountain               Green Mountain
    2290     0.00       0.00       0.00        0.00         1.18      Marshall Gulch               Sabino Creek 0.6 mi SSE of Marshall Gulch

Looks like scattered showers today;  a typical sequence after something major happens, like last night, is for the atmosphere to compensate with some drier air.  So, today should be GORGEOUS in Cumulus clouds that pile up here and there on the mountains, but don’t expect to get shafted unless you’re real lucky.  Wider spread rains expected tomorrow….

Yesterday’s clouds, if you care

Of course, you can the whole day in a hurry here, courtesy of the U of Arizona Wildcats Weather Department, in case you’d like to avoid all the cloud blather below….

DSC_0239-1
6:20 AM. I/m calling this Altocumulus. Don’t see any ice falling out here, but some did off to the SW. Being an all water droplet cloud, I hope you were telling anyone that you were with,  that, “Hell, this layer will burn off fast” since you know that water droplet clouds are more vulnerable to evaporating in sunlight than ice clouds like Altostratus, or Cirrus. And when this layer burns off fast, the Cumulus will arise in a hurry.  Its great that you might have said that.
DSC_0240
9:13 AM. That layer is mostly gone, and there come the Cu!
DSC_0247
1:03 PM. The inevitable Cumulonimbus capillatus incus has arisen over there by  Kitt Peak.
But this photo is special for you because if you look closely, as I know you will, there is also a big dust devil near the Tucson Mountains (center of photo). I’ve noticed a LOT of dust devils form in nearly that same spot where this one is. Must be exciting to live down there!
DSC_0250
1:30 PM. Another daily benchmark, “First Ice”  on the Catalinas. The ragged turret remains on the left have some ice underneath them if you look closely again, as I know you probably will. If you had an aircraft with cloud physics instrumentation and you were looking for the amount ice that formed in those ragged turrets, ones that once looked like the one in the center, nice and puffy, you would best fly toward the bottom of the rags, not at the top since as the droplets in the cloud shrink due to evaporation, the ice-forming stops. Thus sometimes the coldest part of the cloud in those rags has the fewest ice crystals, and more are found lower down, ones that formed by the freezing of those once larger drops, as would be starting to take place in the puffy parts.
DSC_0261
3:56 PM. The rarely seen pileus cap which I seem to photograph everyday on a Catalina mountain Cumulus congestus cloud top. Very pretty, and SO DELICATE!
Things had kind of stagnated as far as Cumulus development went at this point over the Catalinas. Lots of small Cbs, but nothing really shot up, as it was beginning to do to the southwest and west.
DSC_0270
4:15 PM. Another rarely seen pileus top on a Cumulus congestus converting into a Cumulonimbus calvus; ice in a fading, glaciated turret is visible on the left (that smooth portion).  Still, these tops ain’t much in height.
DSC_0281
5:57 PM. Now the big boys to the SW are approaching with huge “plumes” of Altostratus cumulonimbogenitus–you knew that, though in fading versions it appeared. Note dust plume on the right obscuring part of the Tortolita Mountains. And with their approach, and with the dust plume over there, you could easily figure that the wind was gonna blow pretty hard.
DSC_0286
6:00 PM. Only four minutes later, the dust was moving in and the wind was blowing from the SW at 25 to 35 mph. When the wind starts up, look up! That wind will be pushing the air over you up, and often existing darken as their tops rise, or new clouds form. Here, and in the next shot, that SW wind is pushing the air up on the slopes of the Catalina Mountains. Was hoping to see the strands start to fall from these bases near us, maybe feel some “rain plops” as we call them, those giant drops first out the bottom, but that didn’t happen here, but over there on Ms. Lemmon and Samaniego Ridge after that. Oh, well.
DSC_0290
6:06 PM. Another example of the clouds that piled up on the Catalinas as that SW wind was blowing. Wasn’t long after this that Ms. Lemmon was obscured in rain.

 

Last chance for August rain#2

That would be today….  🙁

First, this sight yesterday afternoon was interesting to me and I thought you should see it.

2:09 PM.  Multi-strands of rain pour out of large cloud base.  You won't see such tiny features like this very often.  Usually represent very large drops, formerly hail or soft hail we call graupel.
2:09 PM. Multi-strands of rain (aka, “dancing strands”) pour out of large, firm cloud base in Oro Valley.   You won’t see such tiny features like this very often. Usually represent very large drops, formerly hail or soft hail we call graupel up higher.  There are in this type of cloud always very tiny strands of graupel and hai aloft like this, but not so separated and so dense as here.  The ones aloft might only be 10 yards (“meters”, if you’re thinking outside of football) wide.  The rest of the rain shaft on the far right is in the fading mode, decreasing as the Cumulonimbus cloud above has exhausted its liquid water fuel (the part above the rain; its just rain, its “rained out”, no real cloud until much higher up when you get into the ice part, snowflakes.)

Second, it would appear that I hit the “publish” button before I intended to, before I really got going and figured out what I was going to say.  I was no where near that button!

Third, this will be an assembly job, if anyone is out there, this piece will be gradually coming together, the nuerous errors being corrected on the fly, if it ever really does come together….

Maybe I will deflect attention with a spaghetti plot, get people wondering about that. Yeah, that’s a good idea. They won’t know what to make of it while I think up something to write.

Valid September 9th, 5 PM AST.
Valid September 9th, 5 PM AST.  I think you should really consider this today; talk to your friends about it.  You might want to go to NOAA and look at all of them, to see how this one gets to this point.  I strongly recommend that you do that.

Next, here is some rain data from Pima County.   Then,  some from the USGS.  Dan Saddle, up there on Oracle Ridge looks to have gotten the most in a nearby gauge in the Catalinas, with 0.83 inches measured.  Was that really the most that fell up in our mountains yesterday.  Of course not!  Not enough gauges to hit all the cores that struck those mountains, and its without doubt than 1-2 inches fell in the best ones.

2:10 PM.
2:10 PM.
2:10 PM.  Looking at a second core.
2:10 PM. Looking at a second core.
2:17 PM.  Combining cores.
2:17 PM. Combining cores.
2:21 PM.  Dancing strands storm joins the fray from the west, dark base about to unload.
2:21 PM. Dancing strands storm joins the fray from the west, dark base about to unload.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In conclusion, Q. E. D.

In spite of the numerous heavy shafts of rain around yesterday, none formed above Catalina, except at the north end of town over there by Edwin Road where they had quite a dump in the middle of the afternoon. Only 0.12 inches here in the Heights of Sutherland. Still it was nice to see those Cumulonimbus blossom into such majestic clouds yesterday. So, today may be it for them, at least close to us. Here are a few more sights from yesterday’s fine day:

6:06 AM.  Day started with some fine-looking Altocumulus castellanus, which, according to my cloud chart, one that can be found in fine school catalogs everywhere, it might rain within 6-96 hours.  Worked out pretty well yesterday.
6:06 AM. Day started with some fine-looking Altocumulus castellanus, which, according to my cloud chart, one that can be found in fine school catalogs everywhere, it might rain within 6-96 hours. Worked out pretty well yesterday.
9:34 AM.  Of course, the best indicator of a good Cumulonimbus day ahead is tall spindly clouds like these.  Shows the atmosphere is loaded with instability, or, if you really want to get fancy, CAPE (Convective Availiable Potential Energy).  Clouds are going to mushroom up very easily, and way past the ice-forming level where rain will form.
9:34 AM. Of course, the best indicator of a good Cumulonimbus day ahead is tall spindly clouds like these. Shows the atmosphere is loaded with instability, or, if you really want to get fancy, CAPE (Convective Availiable Potential Energy). Clouds are going to mushroom up very easily, and way past the ice-forming level where rain will form.
10:32 AM.  And within the hour, rain was falling beyond the C-Gap.
10:32 AM. And within the hour, rain was falling beyond the C-Gap.
11:34 AM.  A siting of the seldom seen "pileus" cap cloud on top of a rapidly rising turret.  They were all over the place yesterday, but are "seldom seen" since they last only a few seconds as the turrets punch through them.
11:34 AM. A siting of the seldom seen “pileus” cap cloud on top of a rapidly rising turret. They were all over the place yesterday, but are “seldom seen” since they last only a few seconds as the turrets punch through them.
12:18 PM.  This pretty sight of Cumulus congestus with a remnant of a thin tower that had shot up and glaciated.
12:18 PM. This pretty sight of Cumulus congestus with a remnant of a thin tower that had shot up and glaciated.
12:34 PM.  Within a few minutes, those two congestus clouds had erupted into this beauty toward the north end of town.
12:34 PM. Within a few minutes, those two congestus clouds had erupted into this beauty with another pileus cap toward the north end of town.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OK, that’s it. The End.

Crazy over pileus

Lost control for awhile yesterday evening at sunset as pretty little pileus caps formed repeatedly on top of new Cumulus congestus/Cumulonimbus turrets to the west.  It like an entomologist seeing a spotted owl, or some other rare bird like that.  You don’t see pileus caps that often, and when you do, you’d better have your camera ready because they only last seconds.  Nice sunset color along with them, too. Some nice lightning over that way later, too.

If you were in a research aircraft and wanted to find the most liquid water around at a particular flight level, a pileus cap on a Cumulus turret at that level is a good sign that that’s where it will be compared to other clouds. But don’t  sample too close to cloud top, maybe 100 m below since dry, ambient air is being mixed into the extreme top and you MIGHT not measure the most liquid water there, especially if the top looks a little “frizzy.” .  Its fun to see how much you can hit with an airplane; see what the instruments do.

The rest of the day was very nice before this pretty much replicated the day before in virtually every detail;   several Cumulonimbus clouds arose on Ms. Lemmon beginning in mid-afternoon, anvils trailed over Oro Valley, and there were again a number of distant Cumulonimbus clouds to the NW-NE scattered over the high terrain way up that way.  There were  also Cumulonimbus far to the S-SW toward Mexico, as well as an active cluster to the west at sunset that generated so many pileus clouds.  Here is your cloud diary day in photos:

SONY DSC
6:36 PM. First, before the pileus shots, the overall scene to the southwest and west, and also why telephone poles and overground wiring, relics of the past, are offensive and need to be removed; those wires put under ground. Don’t blow down that way, either.  I’d like to start digging right now!  Hope I’m not upsetting you too much with this scene.  As a CM Jr., , overground wires are the bane of civilization.
5:58 PM.  Grouping of Cumuloni,bus and Cumulus congestus clouds distant west, ones with repeated pileus caps as new turrets surged upward through a thin moist layer, also shoved up due to the approaching rising air in the turret.
5:58 PM. Grouping of Cumuloni,bus and Cumulus congestus clouds distant west, ones with repeated pileus caps as new turrets surged upward through a thin moist layer, also shoved up due to the approaching rising air in the turret.
6:56 PM.  Yet another pileus cap formed, but this time, is above the top of the surging Cumulonimbus calvus (its got rain coming out of it) top.
6:56 PM. Yet another pileus cap formed, but this time, is above the top of the surging Cumulonimbus calvus top. (Its got rain coming out of it, so its that bit better to call it that instead of just a Cumulus congestus.)

 

The clouds prior to the pileus eruptions were these ones:

SONY DSC
2:42 PM. Just a pretty picture looking NW across Saddlebrooke with Cumulus humilis and Cu fractus in the foreground and scattered Cumulonimbus and Cumulus congestus on the horizon.
SONY DSC
11:45 AM. A good sign of an interesting day ahead, that Cumulus sprout over Ms. Lemmon that indicates there is a lot instability (the decline in temperature with increasing height is pretty large) and that further heating will likely lead to deep clouds.
SONY DSC
4:26 PM. A sight very reminiscent of the previous day, a narrow Cumulonimbus shoots up off the Catalinas. This was the second one in a row like this. Kind of blew up into something considerably larger than the one around 3 PM, with this one’s vast anvil eventually overspreading Catalina and Oro Valley.  Here, playfully, it appears to be in the shape of an alien with two arms reaching out, a fibrous, icy one on the left, and a fragmented, droplet cloud one on the right, with a big head between them.

 

5:19 PM.  Pretty much all over here, just a big anvil as bottom got rained out with no more surges of Cumulus to keep feeding it.
5:19 PM. Pretty much all over here, just a big anvil as bottom got rained out with no more good surges of Cumulus to keep feeding it.  Just getting too cool up there.

Want to get one more thing in here, in case you haven’t paid attention to all the rain that’s been falling in Arizona, particularly in the NW part, SE CA, and southern Nevada. They are having a spell that is just incredible. Here, from WSI Intellicast, the 7-day rainfall totals for the US, which highlights how well those areas are doing compared to the rest of the county even. This is an amazing graphic, and so pleasing since all this rain in the Southwest has been falling on very drought-impacted areas.

The seven day, radar-derived precipitation totals for the US.  Mountains, of course, interfere with radar beams that do this, and so in mountainous regions these estimates are likely too low, or can be missing altogether.
The seven day, radar-derived precipitation totals for the US. Mountains, of course, interfere with radar beams that do this, and so in mountainous regions these estimates are likely too low, or can be missing altogether.

Summer rain season set to sputter along today and for the foreseeable future. Looks like there will be a few more thunderheads around today compared to yesterday, a bit more instability today, too, this from a 2 min look at model outputs as choke time approaches. If you want a good forecast, you should see Bob’s writeup. I like Bob. Plus, he’s a stupendous expert on convection!

“Curve ball” of a Cumulonimbus strikes out Catalina again

It looked like it was coming straight down the middle. I didn’t see any rotation on it.   It was coming toward ME… and to Catalina.  We were going to get “shafted”, rain shafted that is, at last!

I started taking video, shooting numerous still shots of the mammoth-behemoth, churning, tropical-like, boiling-roiling Cumulonimbus cloud rolling in from the southwest toward Catalina, lightning sparking every minute or two at one point.  Pileus veils appeared and disappeared as the tops shot upward through moist layers.  What is a pileus?  Hint:  Its not Latin for somebody who flies an airplane.  But, continuing about airplanes….

If only I had a plane, I dreamed, to go inside them, fully explore and experience them in a quantitative way, those voluptuous turrets!  To penetrate their depths with instrumentation like we would used to do in the olden days at the University of Washington, recording the hail/graupel bursts on the pilot’s window, ones where it was like someone had thrown rice at the window, the huge amounts of supercooled liquid water piling up on the airframe, the plane trembling, rocking in turbulence, turbulence whose effects could only be mitigated by Marezine, the lightning strikes on the fuselage, the white knuckled, almost euphoric, glad-to-be-alive feeling afterward.

Yes, those were the good old days.

While our dogs were cowering, made restless by the approaching thunder,  I dusted off my rain gage collector, looked inside it, as you all should do, for telltale signs of recent bird visitations, droppings that might hinder the rush of water into the inner collector, or even block it all together.   Once having cleaned it off, I sprayed the outer collector with WD-40 so that the drops would roll quickly into the inner collector without the least resisitance, allowing the tipping bucket of the Davis Vantage Pro II Extra Deluxe Mark IV rain gage and weather station system to report rain as rapidly as possible.

This was going to be a great rain, it would make up for the prior two day’s of disappointments and sadness, really. BTW, its quite normal for meteorologists to feel like they live in a “hole” where the best rains hardly ever hit.

In case you didn’t call in sick yesterday as was suggested here so that you could see the those majestic Cumulonimbus clouds roll in, and in paritcular, missed this one below that literally rumbled toward Catalina from the direction of Twin Peaks, here is a sequence of shots taken at 12:53 PM, 1 PM, 1:07 PM, and 1:28 PM.  Rain seemed imminent.
Of course, it fizzled out.  Three strikes!  Three days in a row of near misses!
This one got SO CLOSE!  And as you see below, there were flanking bases even as it neared, absolutely necessary for continued life of the storm.  Without those flanking clouds, a Cumulonimbus can have a shockingly short life span, maybe 20-30 minutes of rain to the ground.
As you can see below, those dark bases sans rain shafts (flanking dark cloud bases) were a good sign that the approaching storm was going to continue propagating into Catalina with gusto, and gusts as well, as the flanking clouds piled up into new Cumulonimbus clouds, riding on top of the outflow winds of the rainshaft.

But no, the flanking clouds disappeared in minutes, leaving only the sad stratiform remains of that once proud Cumulonimbus.  Below, 2:57 PM, one of the saddest cloud sights of all, Altostratus cumulonimbogenitus, orphaned from their parent Cumulonimbus cloud, set adrift, and adrift, without being fed from below, well, they die.  Light, ever so light, rain was falling when this photos was taken.
Eventually the steady, very light rain added it up to 0.02 inches.  I felt like I was back in Seattle because the way that rain was falling yesterday afternoon, was EXACTLY like the rain that Mr. Cloud-maven person experienced year in and year out in Seattle, Washington.  Yep, that’s how it rains in SEA most of the time and you experienced that right here in Catalina yesterday afternoon.
The day ended with a remarkable clearing of all the low clouds, not a Cumulus could be seen from horizon to horizon.  But we did have “pretty Cirrus” (spissatus) clouds, also orphaned from Cumulonimbus, to make a nice sunset.
Today, after the early morning rainbow, one that I didn’t get a photo of?
Gee, the dewpoints are still high, we have a surprising amount of mid-level clouds this morning, some with turrets and showers, yet the U of A weather model suggests no rain later today based on what it sees.   Hmmmm.  Its usually correct in these matters, though I hope some surprise is waiting for us late this afternoon anyway.
The End.
Kind of upset I missed getting a shot of that unusual morning rainbow because the camera had no SD card again, so I think instead, out of spite, I will put in a recent photo of some kind of beetle.