Cirrus uncinus. Started out looking like radiating lines of Cirrus, but this look is due to perpspective:
In case you missed them…these stunning skies
Cis fib and Cis spis lead to nice sunset; big trough, big wind ahead
Cirrus fibratus and Cirrus spissatus, of course. Here they are from yesterday.
The weather ahead
Troughulent weather is ahead as you can plainly see here from the NOAA spaghetti factory:
Here’s what it looks like on a regular 500 millybar map (IPS MeteoStar):
No rain in it for us, but if you missed having wind yesterday the 21st, well this situation will make up for it. Likely to be gusts over 40 mph in these here parts when it actually peaks out in about a week. In the meantime, a West Coast trough ahead of this violent jet streamer from the Pacific will keep the air moving long before this unusual event slams into Cal.
The End for now.
Pretty castellanus
Along with Altocumulus “floccus1” as well, many with ice virga. Some clumps got so enthusiastic that they went into sizes that we really can’t name, too large to be Altocumulus elements, and too small to be what we normally would call Cumulus or Cumulonimbus. Here are some more examples of yesterday’s clouds:
Taking a bite out of drought in the Plains States
Here the Drought Monitor for May 7th. Looks pretty bad in the central and southern Plains States and the central and southern Rockies. 
But here’s what’s happened according to WSI’s radar-derived rain totals over the 7 days ending since this map. Makes you fell that bit better for our drought-stricken brothers even if we didn’t get anything. And it looks like rains will continue off and on in droughty Plains areas now for another two weeks. Excellent. Nothing in sight here, sadly.
The End (still putting life together after moving; posts will be a bit sparse).
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1“Floccus” has a ragged or lofted base, one higher than the other ones around.
Big trough coming
In case you missed it, and a note about missing cold air reports
Took time out from a bazillion chores concerned with moving to a new house here, and other doings for a U of WA archive project to savor another great sunset here in Catalina: 
The weather way ahead
Before looking ahead, look outside now (6:20 AM) There are some gorgeous patterns in Altocu and Cirrocu!
The models have gone real bad on us, taking away rain that was once predicted here in early May. Sure, its unusual, but it could have happened. Now its pretty much gone (for now).
In the meantime, sometime very unusual is forecast for the central and southeast US. Can’t remember seeing a pattern like this so late in the winter where in really cold upper low center just goes down to Natchez, MS as in this loop. Lots of low temperature records likely to be set for early May if this pattern comes to pass.
- Valid for mid-day, Tuesday, May 7th.
This continues a trend, too, this spring of well below normal temperatures in the Plains States in the middle portion of this forecast loop. They had one of the coldest springs ever in the northern Plains, and the latest measurable snowfall ever just happened in Wichita, KS. Just yesterday, the latest freeze date in the 91 years of records was established at Wichita Falls, TX, when the temperature dipped to 29 F, nine days later than any prior freeze day.
Here are some additional details, as provided by climate issues troublemaker Mark Albright, former Washington State Climatologist, and friend, who has been complaining lately that if these were high temperature records, they’d be all over the news, but low ones get swept under the media rug.
Here’s Mark’s statement from a few days ago:
“The coldest baseball game in major league history was played yesterday in Denver where the game time temperature was 23 F. It breaks the record set just last week in Denver. You can watch the video here to see the conditions at Coors Field.
“This story echoes my thoughts exactly. Why aren’t we hearing from the news outlets about the historic spring cold wave gripping the US and Canada in 2013. When it was warm last year we heard all about it.
In Fargo ND 45 consecutive days (10 March – 23 April) have passed without a single day of above normal temperature. In fact, they have yet to record a temperature warmer than 43 F this year through the 23rd of April. March 2013 averaged -10.5 F below normal and April 2013 is even colder at -12.6 F below normal so far in Fargo ND. This sets up a major risk of severe flooding in a week or two when the Spring thaw finally arrives.
To the north of Fargo, Saskatchewan is reporting their coldest spring in over 100 years:
Unusual cold has also been seen in interior Alaska where Fairbanks is running -14.9 F below normal in April 2013.”
While it will likely be getting warmer over the next 100 years, we seem to be afraid of reporting low temperatures and cold; that is, while it gets gradually warmer, we seem to be afraid or mentioning that weather will be pretty much doing what its always done, being abnormal a lot of the time, too. Even I get worked up if I think there is a news bias against reporting cold air! It ain’t right.
Dawdling low to bring scattered showers for a couple of days in 10-13 days
We’re not into streamlined titles here.
In the meantime, before taking a hopeful look way ahead; wind and dust. Today begins the well-forecast model trough and low event from more than 10 days ago for the 17th, except its happening on the 15th and 16th. It means afternoon dust and wind, wind and dust, followed by unusually cool air on the 17th. No rain likely in this one, though, like the last dust event; just some scattered Cumulus on late on the 16th and 17th.
The weather way ahead: After the dust, idle speculations of distant rain
There’s a tiny low now east of Hawaiian Islands, that, models say, will dawdle around out there for awhile, but also be drifting eastward eventually, not being picked by the jet stream and Nike swooshed to the northeast as most such lows would be. Just continues along at low latitudes until reaching us late on Thursday, April 25th. Here it is in the NOAA spaghetti plots. It would be astonishing if this itty-bitty low gets here, but, here’s the hopeful sequence in “spaghetti.” This is only brought up because its the first model rain that has shown up for southern AZ in a long, LONG time.
In case you don’t still don’t believe me, here’s a colorful model loop showing that this is supposed to happen to that low east of Hawaii. Further support can be seen in some green pixelation over Arizona from IPS MeteoStar’s rendering of our WRF-GFS model, our best, for the amounts of rain in the 12 h ending on the morning of the 26th.
I hope you’re happy now.
The End.
PS: Pretty happy myself, after learning through a bz website that this blog has value! How much? TWENTY-FIVE US dollars! Thanks tremendously to both readers!
Less splotchy; more filling
The clouds yesterday were supposed to be “splotchy”, big clearings between interesting middle clouds like Altocumulus with long virga strands. Instead there was a vast coverage of Altostratus opacus “dullus” with long streaks of virga, with a few drops reaching the ground here and there but not here. There was some mammatus-t clouds, too. Also, the end of the clouds didn’t get here until after nightfall, not in the afternoon as anticipated from this keyboard.
The result was a much cooler day than expected, too. On TV, they were talkin’ low 80s for yesterday, a reasonable expectation given “splotchy clouds”, but in Catalinaland, it only reached 73 F under the heavy overcast. Very pleasant for being out-of-doors.
Oh, well. Maybe I’ll try building model airplanes and talk about those instead. Or make up historical anecdotes that aren’t true, mixing characters up from different eras and see if anybody notices. Now that would be fun! (Naw. Too silly.)
Here’s your day, beginning just before sunrise when some fabulous, fine-grained Cirrocumulus clouds came over top:
If you want, you can go to this loop from the U of WA Huskies Weather Department here and see how the little splotchy cloud thing with that passing upper trough became a big fat thing as it came by. Also in this retrospective, you should examine the U of AZ Weather Department time lapse film. You’ll be amazed at all the stuff going on in a day that looked pretty dull all in all. Also, at the end (after 5 PM AST) you’ll seen the winds aloft change completely in direction as the backside of the trough, the clearing side, approached. I saw stuff I didn’t know was happening. You’ll also see how the mammatus pouches, if I may, open up into fibrous virga. Thank you, U of AZ Weather Department, for posting these great instruction films!
Not expecting clouds for most of today, but will likely see a couple of Cirrus streaming in from the NW late.
The weather ahead
Still no precip in sight, unless you consider lithometeors a form of precip, dust accumulations, that is, such as we had a few days ago. Half inch (of dust) I predicted wasn’t that bad (hahahah). Dust accumulations expected now on the afternoon of the 16th, and again on during the afternoons of the 25th and 26th of April.
C-M alive, local, and… finished with the dust report, now back to the studio.
The End.
Pillar of the sun
At sunset yesterday, this rarely seen optical display called a “sun pillar”:
Waited for a cute bird or bat to fly above or through the pillar, making it a more popular, valuable photo; instead a helicopter came by. But it “works” as shown below. You’ll have to look hard, but its there.
Some of yesterday’s other interesting cloud formations:
Today’s clouds
Weak wave/trough passing to the south of us has some great middle and high clouds in it, splotchy ones that are sometimes incredibly spectacular, clouds like Altocumulus castellanus/floccus with virga. Just looked outside now and some of those are to the southwest of us at 5:35 AM. You can see how complex the cloud coverage is at IPS MeteoStar’s sat-radar loop here. They’ll be gone later today so enjoy them while they’re here.
The Weather Ahead
There are many troughs foretold for the Southwest and Great Basin area over the next two weeks. That the good news; it also goes with long term climo patterns that troughs like to nest in the Great Basin. But none extrude far enough southward, that is, the jet stream racing around the trough bottoms does not reach us, to bring precip to southern Arizona. Occasionally precip hits northern Arizona over this two week period, which is good, of course, for them and water supplies. In fact, its not even likely that we’ll see a cloud below 10,000 feet above ground level here if this pattern holds. And with troughs and low pressure centers nearby to the north, periods of windiness and dust will occur as they go by.
Fortunately, I guess, there’s little confidence indicated in these forecasts beyond about 11 days, NOAA spaghetti says, and so there are surprises that can pop up yet.
The End.
Tracy day; OK sunset, too
BTW, finally got a “submission” in late yesterday about our neat storm after what was deemed a power outage of some type affecting the hosting service yesterday. After re-reading it, perhaps I had too much time to think about it… Oh, well, onward.
First, from yesterday, a day with occasional sprinkles, dessert:
The remarkable thing about yesterday, and you might have thought it was fog, was the amount of dust in the air after the rain and after the winds calmed down from those 50-60 mph blasts from yesterday. Well, it was plenty windy in the deserts behind the rainy frontal band and that dust-laden air moved in right after the front went by. At first glance, and since it had rained, I thought it might be fog! But a quick check of my senses and the relative humidity, which needs to be near 100%, showed that it was only around 60%, the measurement that demonstrated it could not POSSIBLY be fog. There you have it. Problem solving for you by C-M.
Here’s an example of that dust:
With cloud tops yesterday only having to reach to 11,000 feet above sea level to surpass the magical -10 C (14 F) temperature level, hardly much above Ms. Lemmon, ice and virga from these clouds was virtually guaranteed. And, if you were watching, there was plenty, including from those clouds we couldn’t really see so well due to dust, ones that produced those several morning and early afternoon sprinkles (“its not drizzle”, a continuing theme here. Only a meteorological ignoramus would call a fall of isolated drops, “drizzle” (or snow and rain mixed together “sleet”). Perhaps I am too strong here, but it is important to get it right since REAL drizzle and sleet (raindrops that freeze on their way down through a shallow cold layer) tell you important things about the clouds and layering of the air overhead. Here are some of yesterday’s clouds as the dust thinned (both due to mixing upward into a greater depth, and due to clearer air moving in):
By mid-afternoon, most of the deeper clouds with substantial virga were gone. You can see what happened in the mid-afternoon here in the U of AZ time lapse movie (as well as the thinning of the dust haze we had yesterday) here.
The weather ahead
No rain has popped now in the mods for some time regarding the passage of a trough on the 17th, just some wind with it, though not anywhere like what we just had. In the drought relief department, it was another great day yesterday for portions of KS and NE as shown in the WSI Intellicast radar-derived precip map:
The End
“Great Unexpectations” (0.38 inches fell when almost none was expected)
Of course, the title refers to Dickens’ little known sequel (and frankly, a lightly regarded one) to his popular, “Great Expectations”. Dickens fully expected that by rushing out another novel similar to “Expectations” that a financial success similar to the one that “Expectations” had garnered for him would be easily acheived.
However, like most sequels, his effort was weak and appeared to be thrown together to merely take advantage of a gullible public. However, and much later, his sequel came to be regarded as a semi-clever, though lightly disguised, slam on the early English weather forecasting system, which was, of course in those days, was map-less, model-less, and mainly consisted of limericks and folk sayings:
“Birds flying low; beware the Low1.”
Forecasts were quite bad in those days in which Dickens lived, naturally, ships went down regularly due to unforecast storms, and Dickens wanted to dramatize this to his readers in his sequel; the various twists and turns in the plot of that sequel now thought represent ever changing, unreliable forecasts. He had hoped, with his satirical sequel, to provoke advances in weather forecasting, which he did. Isaac Newton, joined by Leibnitz, took wind of the Dickens sequel, and together they invented calculus, a tool which which allowed the calculation of the movement of air using the laws of fluid dynamics.
—-End of historical antedote2——————————
A surprising overnight rain
Well, even C-M and associated models like the Beowulf Cluster as of the 5 AM AST run on the 8th, did NOT see 0.38 inches from “Joe Cold Front”, who was supposed to pass by as a dry front, not a wet one. Still, it was fantastic surprise, one that could have only been made better by having forecasted it from this keyboard; going against the models big time. And THEN to hear Joe’s rains pounding on the roof as he went by between 10 PM and midnight. Oh, my, euphoria. BTW, the temperature dropped from 60 F to 43 F, too. Whatafront! Thank YOU, Joe.
You can see some rainfall totals from the Pima County ALERT gages (April 8th-9th rainfall). We “northenders” pretty much got the bulk of it, with Pig Spring, 1.1 miles northeast of Charoleau Gap leading the way with great 0.71 inches. Ms. Lemmon was not reporting at this time because it fell as snow. So look for a frosty Lemmon this morning. BTW, Sutherland Heights picked up 0.42 inches, and had “pre-rain” gusts to 58 mph! Whatastorm!
Continuing now at 7:21 AM after a “godaddy.com”/Wordpress meltdown an hour ago.
BTW, all the haze out there is dust under the clouds, not fog. Its pretty unusual to see something like this, especially after a good rain, so you’ll want to document it with photos and a little paragraph or two about it, and how it makes you feel. There was so much dust raised behind Joe throughout AZ and Cal that its rainband could only do away with that dust within it. This overcast situation should gradually breakup as the day goes on into more cumuliform clouds, ones with large breaks between them, the dust probably hanging on most of the day. With the -10 C level, the usual ice-forming level here at just around 11,000 feet above sea level. So it should be easy for the taller Cu to reach that and spit out some isolated precip later in the day.
Signs that the forecasts were going bad in a major way was when lines of clouds and some with precip formed in southwest Arizona late yesterday afternoon. Here’s a nice map of that development, one in which caused the tiny brain of C-M to think that it might rain, probably you, too, and anyone else that looked.
Some scenes from yesterday’s dust, from the beginning. Save these for posterity:
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Feeling good about rain here, feeling good about rain there
Not only can we exult over a surprise rain of some substance, but look what has been happening in the droughty central Plains States. Below, from WSI Intellicast’s 24 h radar-derived rainfall amounts for the US (april 8th, then April 9th at 5 AM AST. Especially take stock of the amounts over the past two days in those worst drought areas of Kansas and Nebraska. So great! And this is only the beginning of a huge rain/snow event in those drought areas!
The End
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1Hygroscopic insects adsorb water molecules and are weighed down in conditions of excess humidity, the kind that often precedes a storm. Birds then fly lower, too, to grab lower flying insects, or so the saying goes. (I am quite pleased by the kind of information I provide for you almost everyday.)
2To facts