Cooler now, but windy, ovenly conditions just ahead

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Here is the temperature change from yesterday morning at this time to today at this time, courtesy of The Weather Channel and due to that dry cool front that went through yesterday.  Its about 8 degrees cooler this morning here in Catalina compared to yesterday at this same time.  Nice.

But, its back to above normal temperatures for a few days after this respite.  Normal is around 90-92 F here in Catalina for this time of year, but a 100 F is just ahead I’m afraid.  No rain seen in mods for the next 15 days, too.  Feeling glum.

Yesterday’s clouds

Had some nice supercooled Altocumulus translucidus clouds yesterday after the Cirrus departed.  Here’s a shot that was taken as an aircraft flew through a patch of it.  Note fine contrail.  These clouds, from the Tucson sounding at 5 AM AST, appear to have been at temperatures between -15 and -20 C, ripe for aircraft to produce icy canals or holes, and that’s what happened.  Below is the rest of the sequence, taken from different locations.   In the last shot, the tip of that icy contrail began to light up and I thought I might see some color due to refracting ice crystals, but it didn’t happen. These aircraft effects on supercooled clouds are receiving more attention in the scientific community, BTW.

For a time, too, we had our lenticular cloud friend downstream of the Catalina Mountains in its normal position.


Powerful, but dry system progged for later next week

Check this “four panel” out, bottom of blog, from the Canadians from their model run last night.   Its valid for the afternoon of Thursday, May 24th at 5 PM AST.

My first thoughts:  Egad!  Holy Smokes!

Looks like low temperature records will be broken in the West and Pac Northwest as this comes through those areas.  However,  the thought of the ovenly air over the Southwest at this same time, being drawn into the western High Plains States was alarming.  This is because it could get superhot over there as our hot air comes down out of the Rockies.  Fortunately, the models don’t show the 120 F temperatures in the Plains my alarmist mind was generating.

What WE will get here in Catalina as this giant trough settles in the West for several days is a LOT of wind and dust in a lot of hot air before the cooler air arrives sometime after May 25th.

This period of wind and hot air will be awful for the fire situation.  No rain is indicated with this giant low, too.

I dread these days because you’re thinking about how much is on the line as far as our forests go.

The End.

Cooler hot air riding in from the West later today

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Should arrive by later this afternoon as foretold in models, unfortunately, in view of fires, with a lot of wind before and after a dry cold front gets here, too.  Check the NWS forecast for Catalina here.

The Cirrus clouds this morning?  The only trace of clouds we’ll see with this trough and “cold front” today, if you can call it “cold”,  with temperatures still in the 90s.  Those clouds will be gone by mid-day.Tomorrow morning we’ll notice a temperature difference!

The weather ahead, as you likely know, fiercely hot early next week, after our little cold front goes by today, followed by another dry, windy,  ”cool” front around May 25th.

Of course, if you’ve had your NOAA spaghetti plot this morning, you probably already know about that weather change eight days from now.   Here’s a chart from last night’s spaghetti run.

What do you see in the map below?

 

Except here at this blog, you have NEVER seen a weather map like this before!  Imagine your TEEVEE weather presenter showing you something like this!  Heck, where’s the land?  Well, you can see Florida and Communist Cuba in the lower right hand corner.  Just remember that Arizona is somewhere to the west of Florida.  The outer dotted line is the Equator, where the date changes.  (Just kidding, want to see if you are paying attention.  Eyebrows should be raised on a couple of counts because TWO things are wrong in that ONE sentence.)  OK, on to the map and no silliness….

First, those yellow lines are where the actual weather map contours of 576 and 552 “decameters” at 500 millibars pressure are predicted to be in last night’s run, on the afternoon of May 25th.   When those yellow lines bulge southward, as they do in our domain in the West, a trough was foretold in that run.   All the other red and turqoise lines help determine how reliable where those two yellow lines will be.

Look at all the red lines pushed down toward the Equator in our sector!  There is nowhere in the northern hemisphere where so many red lines (576 decameter contour) extrude so far toward to the south!  These red lines are from the same model, but run with slight changes in “initial conditions” (you might think of it as with a couple “bad balloon” readings) to see how robust the “signal”, the predicted features in the model are.

So, when all the lines, as wobbly as they are, do the same thing (extrude to the south, or bulge toward the north as they do northeast of the Hawaiian Islands) then the “signal” is quite strong, and the foretold feature more reliable.  So eight days from now, a pretty long time in model predictions, we can be pretty darn confident there’ll be a MAJOR trough in the West that will affect Arizona.   See how the turqoise lines also dip southward for the most part.

And what does that mean as far as Catalina weather?   Dust, wind, and cooler weather for awhile; “dusty cool snap.”

No rain is indicated at this time, though the summer thunderstorms will be close prior to the dusty cool snap.

OK, I think I have confused things enough.

 

The End.

 


 

 

Cooking with solar; dusty cool snap still ahead (25th or so)

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It was 99 F here in Catalina yesterday.

Spinning entity in AZ today.  See it here in the water vapor imagery from the Huskies, the Washington ones.  Not much moisture with it, but we did see a couple of….. of…..yes, “Cumulus fractus” yesterday, maybe one big enough to be a humilis, if “big” and “humilis” can be used in the same sentence.  In case you missed them:

No ice.

The zoomed shot is because Mr. Cloud-maven person could detect a “pyrocumulus” on top of the Crown King fire on the horizon.  Can you?

Here’s the sat image, also from the Huskies, and you can see the tiniest little white spec on the top of the smoke on the left side.


Likely more Cumulus today.  Yay.

At least some hot air relief is on the doorstep as a couple of weak troughs buzz the State in the next couple of days, but then its back to The Oven for a couple more.

However, after that, a much bigger cool down is still ahead…

Dusty Coolsnap coming to town

I wish there was a western singer by that name because I would probably buy his/her records.

Anyway, he’s coming to town around the 24-25th-26th, and its going to be real windy, REALLY windy with a lot of dust around, but then we won’t be cooking with solar so much then.

This is due to “big trough” implanting itself in the Southwest then.  Will cause a lot of weather mayhem in the West for late May.  Here are some scenes from the upcoming “show”, courtesy of IPS Meteostar:  Opening the show will be The Ovens, with their hot rendition of 102 degrees (or more) here in Catalina on the 21st.

It will be so great to see “Dusty” after that! Hahahaha.  Oh, well, I’m trying really hard here.

OK….now look at all the isobars in the maps below, valid for the afternoon of the 24th and then the 25th! Bunched in the State of AZ those days around that huge low center, first in southern Nevada and then,  the next day,  over Needles, CA!  Wow.  It just sits there!  This is going to be fun, something besides hot air to think about.

Note, too, all that precip that creeps down into southern Nevada on the 25th.  Sadly, that’s about as close as it gets to us here in Catalina.  Oh, well, maybe things will “improve” for us as the event gets closer in the models.   The real cool down is after the low goes by,  after the 25th.

The End.

 

 

 

Fires and smoke

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Yesterday afternoon smoke from the Gladiator-Crown King and Tonto fires began spreading toward Catalina.  Here are a couple of photos taken toward evening.  The first photo is of the Gladiator fire plume and the second has the Tonto fire plume on the horizon on the right.  You can see a bit of separation between the two plumes.

As is typical of fires, they flare up during the hot daytime hours as these did yesterday, and those plumes are the evidence from that.  This morning, like yesterday morning, the plumes are likely to be more like haze layers than plumes, but then the plume characteristic will likely return this afternoon and evening as the fires heat up again.

Plumes like these in the photos show fairly close origins of fires, where smoke that has drifted in from Alaska or Asian fires would not have the streaks and irregularities in density that you saw yesterday evening.  Those from very far away would be more of a whitish vellum over the whole sky in which the layer seems to be almost the same thickness as you look toward the sun.  Generally, you don’t see those “long-range transport” layers when looking opposite to the sun.

Below, a satellite image from the University of Washington showing where the two fires were as of 6:15 PM yesterday relative to Catalina (the circle).  You can just barely make out the plumes that were heading our way.

Also you can see how close a bunch of Cumulonimbus clouds got to us yesterday evening, ones moving from the N as a new round of rain spread over eastern Arizona, New Mexico and Texas.  Sadly, they will stay well to the east of us.


 

 

 

 

 

 

 

 

 

 

 

 

Earth on fire map

How does fire activity in the US and Arizona compare with worldwide fires?  Not so bad.

Below is a summary map of fires for the last ten days of this past April as detected by satellite. This image was provided by the University of Freiburg, Germany. These are not campfires, but full blown deliberately set or wildfires.



Kinda depressing. Those in the Saudi desert may just be those due to the burnoff of natural gas, yikes what a waste!

Also, you may notice not so much going on in the Brazilian rainforest, say compared with the jungles in central Africa-Zambia. This is mainly due to the fact that the rainy season is just coming to a close in Brazil,and most “biomass burning” takes place during the dry season, one that peaks in August, but also due to the Brazilian government’s attempts to reduce such fires in the “Green Ocean.”

 

The End.

Feeling good about others on mom’s day

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In this case, we can feel really good about the people and mom’s in Texas today.

Why?

A huge dent was made in the drought there over the past seven days there.  Below is the radar-derived rainfall (its not from rain gauges) for just one week ending yesterday in the US, courtesy of WSI Intellicast, one of the writer’s favorite weather sites.  Check out the amounts in Texas!  Some locales (those yellowish areas) have received between 8 and 16 inches of rain for those seven days!  Imagine how good those folks feel in view of all the sad droughty, hot days they have endured over the past 12 months!  There has been drought relief, too, in southeast New Mexico.   This map, BTW, also still has our little rain event here in Catalina on it, too.


Coming into this “water year”, October 1-September 30th, the drought was about as bad as it could get.  See below from US Drought Monitor folks at Big Red in Lincoln.  Fortunately, the forecasts for continuing drought conditions in these parts of the SW and southern Plains, largely based on the presence of a La Nina regime in the eastern tropical Pacific,  were only partly correct for the ensuing fall-winter-spring period and the drought has been much alleviated.  The second drought monitor map, though not yet reflecting the most recent heavy rains (will post that on Tuesday when it comes out), gives you an idea of how our past eight months did in alleviating these horrible conditions, ones that helped drive hay prices so high as us horsey people know.

Also typical of weather patterns:  when its raining a lot in one segment of the country, its usually NOT in another segment.  So, you can see in the second map, while some of AZ and NM, and the southern Plains have gotten relief from drought, its gotten worse or spread to other areas in the West.

Not much else going on here, other than the chance of passing isolated Cirrus clouds today with a lot of hot air.

Dusty cool snap still in models for later in May, 25th plus or minus a day or two.

The End


 


Let’s talk about May

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Now in a really good web site about weather, clouds and climate, we would have talked about May around the first of May.  But let’s face it, this site really isn’t that great.  So now we’ll talk about the climate of May on May 11th.

Below is the rain frequency climate, such as it is, for May here in Catalina.   Surprisingly, to Mr. Cloud-maven person, there is no downward trend in the chances of measurable rain from the very first days of May until the end as was expected.  Instead, each day of the whole month has about the same small chance of rain from the 35 year record mostly made by the folks (Wayne and Jenny) at Our Garden here in Catalina.

Where the rising temperature graph for May, you ask? Well, I don’t do temperature. I am cloud and rain person. A nice graph of the temperature trend for May, which we know is upward on average for the whole month, can be found here at the Western Regional Climate Center, housed at the cloud seeding-inclined Desert Research Institute of the University of Nevada which issues misleading PR pieces on cloud seeding which they conduct for the State of Nevada (no, you won’t find them, in spite of being an academic institution, doing proper randomized cloud seeding experiments, but rather bogus-style “operational” seeding.  They’d be AFRAID of doing a proper long-term, double blind randomized experiment using independent evaluators!  If I was them, I would be afraid, too, about what such an experiment might tell their long term funders!  Don’t get me started on cloud seeding discussions!

Now, where was I?

Oh, yeah, climate.  Don’t get me started about the parallels between some aspects of the purveyors of global warming info (I’m talking exaggerations, not the prospect of it which I have to grudgingly go along with, “grudgingly” because I really hope there’ll be an ice age tomorrow when I read some of the exaggerations that come out for the purpose of scaring people,  like this or that storm or tornado was due to global warming.

Yes, there are parallels between cloud seeding claims and some of the GW ones, mostly, in this writer’s opinion, driven by the need for funding.

Now, an hour later,  back to that graph at DRI….  You can see that the temperature at the U of A rises steadily throughout May on average.   We knew that already, so there really wasn’t much point in showing it, but I feel a lot better now having exhausted some hot air myself.

 

The End.

 

 

 

Dusty humbug produces 0.01 inch of rain in Catalina

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When the massive dust cloud rolled in from Tucson-Oro Valley, I heard a neighbor screaming at the kids outside, “Go inside, the rain is coming!”  A “humbug” is an imposter, meant to deceive, and for a time, I’ll bet many folks, like my neighbor,  thought a good rain was coming along with the darkening sky (composed mainly of….”Altostratus cumulonimbogenitus”–kind of a silly name, some with areas of virga).  There were also dark-looking Altocumulus opacus clouds, and Cumulus humilis at the bottom of the As here and there (e.g., see second photo).  So, it was a threatening sky to be sure!

Go here to see dust storm roar through Tucson, courtesy of your University of Arizona Wildcats Weather Department.  Very exciting!  Plus you will see all the cloud movement that was going on before the dust hit.

Below are a few shots from yesterday’s dramatic dust cloud as it rolled and roiled northwestward out of the Tucson metro area and up the Oro Valley.  First, a cloud shot that showed truly remarkable Cumulus-Cumulonimbus development east of the Catalinas just after 7 AM AST yesterday.   You knew at this point, it was going to be an interesting day with so much so early.

Then, "whilst" in a local gym, this came round the corner of Pusch Ridge (2:59 PM AST)

3:04 PM AST: Within 5 minutes it attained the classic "haboob" shape roaring into Oro Valley.

By 3:10 PM AST, it had filled the valley.

Finally, 4:33 PM AST, descending on Catalina from the NNE, a weak thunderstorm and a bit of rain to turn the deposited dust into mud. Cleaning all windows this morning.

All this was caused by the huge splash of rain to the east and southeast of Tucson yesterday earlier in the day.  With high bases, and lots of dry air below, as you all know by now, the scene was set for a massive drop of cold air as the rain evaporated below the bottoms of those clouds.
Next: June preview in May
The total of maximum temperatures added together over the next 7 days will be HUNDREDS of degrees!  This makes no sense at all, but it does sound dramatic.  It will be hot for awhile.
But then what?
Pretty strong signal from the NOAA Spaghetti Factory that another cut off low or trough will barge into the State by the 25th of May.  With that would be a strong cooling, and maybe some rain.
The End.

Yesterday’s awful Cumulus clouds; better ones today!

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From the University of WY Cowpokes, this awful sounding from yesterday afternoon at Tucson.  Where the two lines first pinch together, around the “500″ label, is where the Cumulus cloud bases were yesterday afternoon (marked by the oval)!  To see why those Cumulus were awful ones with too much ice, check the temperature lines, the ones that slope upward to the right with the labels on the bottom, “0″, -10, -20, etc.   Yep, that’s right, the bottoms of those clouds were at 500 mb, and -20 C!  The Weather Cowboy sounding algorithm, the one that produces all the numbers in the column at right, thinks the bottoms of Cumulus clouds were even HIGHER, at 428 mb and nearly at -30 C (that “LCLP” number)!

So, the awful looking, dried out, Cumulus clouds have been explained.

Too high, too cold, too much ice.  Reminded me of the old days in Durango, Colorado, in the early 1970s.  Charming town, but awful place if you wanted to see Cumulus clouds without much ice.  Too high, too cold, and too much ice there, too.

What’s wrong with too much ice?

Too many ice crystals completing for itty bitty amounts of “condensate” (yes, Virginia, even at those temperatures, cloud begin as liquid droplets).  But when they are so cold to begin with, so many of the droplets freeze, that they all try to take the water from the ones that haven’t frozen (cause them to evaporate, the water molecules rushing to the nearest ice spec.

So when nearly ALL the droplets freeze, the ice crystals are all itty bitty as well, and can’t fall out, even though individually they may have a bit more mass in them than the droplets.  They just float up there and gradually die.

Stories from the field interlude

OK, gotta get this out…   In the domain of cloud seeding, where ice-forming nucleants are put into clouds, the phenomenon of having too many ice crystals would be called, “over-seeding”.  Believe it or not, deliberately “overseeding” clouds to make them look like the ones we had yesterday, and so that they wouldn’t rain has been tried!

Yikes.  Why?

The Coors Brewing Company, in the early 1970s,  did not want their hops in the San Luis Valley of southern Colorada (around Alamosa) spoiled by having rain fall on them at the wrong time.  The program was ended when alfalfa farmers in the same area, ones that WANTED RAIN, terminated the program prematurely with sticks of dynamite;  they blew up the seeding contractor’s radar, used to direct aircraft into the clouds to seed them.  Mr. Cloud-maven person, the writer,  was working in Durango in those days, on the other side of the mountains from Alamosa, on a scientific cloud seeding project (a randomized one) to see if seeding could cause more snow to fall from winter storms, so he was close to the “action.”

Yes, everyone gets excited about clouds and weather, especially alfalfa farmers!  Its so great.

Below a few shots of yesterday’s small, ice-ed out Cumulus.

The haze below this little Cumulus fractus cloud is due to ice having formed in it! Bad news from the get go if you're hoping for virga and rain later in the day.

Merely a Cumulus humilis, center, and having a bit of puffery. But its mostly ice. Quite awful-looking, really.


About today’s “better” clouds

Overnight there was an invasion of air from the east carrying increased lower level humidity. How cold will the bases be today after yesterday’s -20 C or so? Around 0 C our TUS morning sounding suggests. While that’s still cold, it should mean rain to the ground here and there in the fatter Cumulonimbus clouds that will be around even though they will be dominated by ice again. With these higher base temperatures, it means more water condensing in the clouds BEFORE ice forms. When that happens, you are likely today to get “graupel” forming in areas of the clouds where the condensation is greatest, and the ice just beginning to form. “Graupel” or soft hail, falls rapidly compared to ice crystals and aggregates of ice crystals (i.e., “snowflakes” to get away from jargon) and those graupel up there are likely to be what MAINLY gets to the ground today, melted of course, into raindrops. This because the “free air” freezing level is about 7,000 feet above us here in Catalina (3,000 feet elevation). Should be a fun day, reminding us of out upcoming summer rain season.

And, what do we think about when we think about graupel/soft hail forming in the clouds overhead?

Electricity, lightning!  Yes, these clouds will be getting “plugged in”, so to speak, this afternoon here and there.  Be watchful.

 

Nice display of Cirrus uncinus in the late morning as Cu began to form.

BTW, if you want a really expert discussion for today, go to Bob’s page here.  (He may weigh in on this later…) And,  of course,  our NWS here.  They seem to be getting pretty worked up and excited about today’s weather and all the wind that might blow out of our afternoon thunderstorms.

BTW, nice flowers out there in the desert now days; this on our “Arizona rose” (took about nine attempts to upload this!  Bad WP!)

 

The End.

Spinning on down from Glasgow to Rocky Point, a low

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This is pretty interesting; don’t see this happen too often where a lobe of low breaks off and spins from Montana, back toward the south-southwest to pretty much over Rocky Point, MX, as you will see in this past 48 h water vapor loop.  In a water vapor loop, you pretty much see all that the movement that is taking place in the atmosphere and here you can begin to understand why it takes biggest computers on earth to model it.  Here’s a close up from IPS Meteostar.

Note, too, those white puffs exploding in west Texas as our little low spins thisaway.  Those are massive thunderstorms that our low has and will be triggering in west Texas and eastern New Mexico over the next few days.  This is great to see that happening due to the drought those poor folks have been experiencing over the past couple of years.  This little low, as tiny as it is, will make a huge dent in those conditions in some areas.  It really would be great to be there in some little town, like the well-named town of “Plains”, TX, and see how happy the folks are getting as the rains hit.  It would be like the end of a Hallmark movie where everyone is quite happy about how things have turned out.

Here are two shots showing what its like now in Plains-Floydada, TX, area,  First, you can see that the earth is quite flat there.

Note green along highway. It has been raining off and on in these areas for the past month, so things are perking up. There were occasional bursts of wildflowers, too.

These aren't horses. What are they?

But while Texans are getting happier and happier (and I hope they don’t complain about flooding because that would be just plain WRONG), what’s in it for us?

Well, the quality of moisture is less here toward the center of the low, maybe about 1/3 as much in the air over us as in Texas.  So, what does that mean we will see?  Maybe a few Altocumulus in streaks, maybe finely patterned Cirrocumulus, and then as afternoon comes on, some Cumulus with high bases because its so dang dry.  I better predict some Cirrus cuz I see some now!  Also, I think I will forecast that the low temperature this morning will be about 62 F here in Catalina because that’s what it is now.   Maybe some ice optics, too, now in progress!  Continuing, these clouds, too, mean some great opportunities for sunrise/sunset color and ice optics now that I see one (parhelia).

But with those high bases goes low temperatures, likely well below freezing, and you know what that means.  The tops are likely to be colder than -10 C to -15 C, 14 F- to 5 F), an ice-forming threshold hereabouts for small, high based Cumulus.   With the formation of ice, VIRGA, snowflakes and ice crystals come out the bottom.   You can see this by the hazy look around the clouds where it is evaporating–ice takes longer to evaporate.

In the higher terrain, the virga will melt into rain and reach the ground, and the clouds will likely get tall enough to produce lightning, but not here today, but to the north of us at least early in the afternoon and evening.  Our best chance of rain with thunderstorms in southeast AZ will be tomorrow as the moisture gradually increases over us from the backflow around the north of the low.  The low is forecast to pass to the south of us tomorrow and Thursday.  You can see all this happening in our local U of AZ weather model here.  (Note the local time is in the upper left hand corner.  You will see the precip is only forecast to occur in the afternoon and evenings with this system.

So, finally, some weather excitement in the offing!