Crepuscular rays of the setting sun bathe altocumulus castellanus (ACCAS) clouds in their golden glow, as another spring day ends on the Minnesota glacial prairie. ACCAS is a sure sign of an unstable layer aloft, whether or not any deeper and lower convection ever takes advantage. In the distance, a low stratus band signals the approach of a cold front. 4 N Clarkfield MN (7 Jun 4) Looking … [Read more...]
Search Results for: crepuscular
Doppler Ray-dar
In the early–mid 1990s, the National Weather Service, in word and deed, established the WSR-88D (a Doppler radar) as its own "ray of hope". This shot, therefore, would be ideal for a promotional brochure touting its marvelous powers. Actually, the radar dome located on OU's North Campus was fortuitously juxtaposed in this early-morning view, with crepuscular rays beaming through a notch in some … [Read more...]
TCu (not TCU)
A classical towering cumulus (meteorological acronym: TCu, as opposed to TCU the university) shoots skyward in a low-level convergence zone connecting other, larger areas of convection. Storm observers who can see through towers don't assign them much of a future, and for good reason; they are entraining dry air aloft. Still, the shifting crepuscular rays helped to make the scene splendid as we … [Read more...]
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