About real clouds, weather, cloud seeding and science autobio life stories by WMO consolation prize-winning meteorologist, Art Rangno
First measurable rain in recent memory falls in Catalina! Also, strange and regular undulations observed
“Recent memory” is, of course, only about three weeks, certainly not more than a month….
BTW, FROPA is occurring now (3:55 AM-4:10 AM, marked by the usual wind shift to the NW from the SW, heavy bursts of rain in this case, and a sharp drop in temperature–so far we’re down from 55-56° F to 45° F in about 20 minutes. Likely will hit the upper 30s before the cooling stops. The rain total yesterday morning by 7 AM from the first rain band, mostly fell from mid-level clouds, was but 0.02 inches. Today, the total is going to be over 0.25 inches by 7 AM. Excellent indeed.
(Update: 7 AM rain total here in Sutherland Heights is 0.51 inches, as measured in a NWS style 8-inch diameter gauge! Awesome. The U of AZ model really nailed this event, predicting 0.25 to 0.50 inches here.)
Let us begin the cloud marathon that led to “rain.”
Creeping toward the present….by yesterday morning, things looked serious. I hope you noticed how FAST the clouds were moving, ones just above Ms. Mt. Lemmon:
Some sounding comments, this nice sounding plot from IPS MeteoStar:
But what about those strange clouds later, undulations and cave-like cloud bottoms? For the person still reading this tedious blog, here are a few shots of those extraordinary scenes, ones you might only see with the ferocious winds aloft yesterday:
Well, at 6:41 AM, the rain is over, with nothing definite now in sight, though there are close calls since we seem to be in or near the “mean trough” where individual troughs and fronts like to collect and reach their farthest points south. While rain is “iffy” in these passing troughs, fluctuating temperatures from pleasant days to cold days following dry cold fronts passing by is virtually certain.
The End.
By Art Rangno
Retiree from a group specializing in airborne measurements of clouds and aerosols at the University of Washington (Cloud and Aerosol Research Group). The projects in which I participated were in many countries; from the Arctic to Brazil, from the Marshall Islands to South Africa.
Great cloud shots as usual , Art. I love particularly those scenes with the undulating, concave/convex SC bases. I should send you a photo I took similarly some years ago here. At one time I was started to get nervous , expecting a funnel cloud or something dramatic to happen. But no wind or precipitation resulted. Merry Christmas! p.s. snow expected here tomorrow
Thanks, Roland. Yes, I have seen those clouds in the SEA area, and always in situations with warm overruning Pacific air was riding over a residual cold dome in western Washington, though, not as dramatic as two days ago I have to say.
Thanks, too, for the Christmas wishes which are reciprocated. A potential snow situation is beginning to show up here in 10-13 days. It usually snows at this elevation (3350 feet, 1000 meters) once or twice each year.
Great cloud shots as usual , Art. I love particularly those scenes with the undulating, concave/convex SC bases. I should send you a photo I took similarly some years ago here. At one time I was started to get nervous , expecting a funnel cloud or something dramatic to happen. But no wind or precipitation resulted. Merry Christmas! p.s. snow expected here tomorrow
Thanks, Roland. Yes, I have seen those clouds in the SEA area, and always in situations with warm overruning Pacific air was riding over a residual cold dome in western Washington, though, not as dramatic as two days ago I have to say.
Thanks, too, for the Christmas wishes which are reciprocated. A potential snow situation is beginning to show up here in 10-13 days. It usually snows at this elevation (3350 feet, 1000 meters) once or twice each year.
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