First, let’s see how excited the NWS is about our upcoming major, drought-denting storm, now “in the bag”:
Tucson, here and a nice NWS YouTube presentation here.
As you will see from these links, they’re getting pretty worked up, and have issued the SAME “Special Statement” for ALL of Arizona, that’s how big the storm is. We’re all in this together. BTW, the U of AZ model forecast from 11 PM AST last night had as much as 5-6 inches of rain indicated in the central mountains of AZ over the next 24-36 h! Will the washes flow here, eventually as the major rain moves east? Hope so.
But, must point that the range of amounts that will fall here in Catalina has to be considered quite large; something from “just a nice rain” (0.4 inches total) to a gully washer (1.5 inches total) due to the fine-scale of the heaviest rainfall bands rotating around the dawdling low over the next couple of days. Its really not possible to pin it down better than a large range of possible values in situations like this, but it does appear that most of it will fall on Friday night into Saturday.
In the meantime, more pretty skies today before the deeper clouds and rain get here overnight or tomorrow morning. Very little rain is indicated here, though, through tomorrow evening,in this latest U of AZ mod run. while inches pile up just to the west and in the AZ mountains.
Yesterday’s clouds
Had pretty skies all day yesterday, even saw some clouds that as far as I know, have no name, these ones below that LOOK like Altocumulus perlucidus but are all ice at Cirrus levels. Could be called, to make up a name, “Cirrus perlucidus” I guess:
12:04 PM. Cirrocumulus lenticularis, a bit too thin to be Ac lenticularis.
The weather way ahead
Valid at 5 AM AST, December 2nd. A near twin of the upcoming situation.
Now showing up on mods, as November closes out, a low center that looks an awful like the situation we’ll have tomorrow and Saturday, another vortex aloft tracks S along the coast, settling in around San Diego, then moving along to the east very slowly. As you know, weather patterns like to get in a groove and repeat themselves for awhile. Could be we’re in that phase where the SW is a low “magnet” and that would mean above normal precip over a spell of a few weeks. Above, a map for December 2nd at 5 AM AST that looks a lot like what we have coming right up. For that reason, you tend to place a bit more credibility than you might otherwise in a forecast that far away. The exact day this occurs will be most likely be off, but it is likely that a troughs/clouds and precip will to affect the SW over the next couple of weeks or more. Good bye dry spell!
If you don’t believe me, check this 10 day outlook from the NOAA spaghetti factory:
“Lorenz plot” from NOAA,
valid at 5 PM AST, November 30th. Its pretty plain to see that there is a strong likelihood of a cutoff low in the extreme SW US, if you can find it. (The vast number of contours is due to a software glitch today. Usually only a few upper level contours are tracked.)
