Yesterday night, western Washington had the visible deal with of an impressive lightning show alongside the western foothills of the Cascades. A shocking image by Sigma Sreedharan, illustrated the energetic thunderstorms that hit the area after roughly 5 PM
And the lightning strike map over the 24-h ending 1 AM at this time (Wednesday) reveals the a whole lot of lightning strikes west of the Cascade crest.
Theses thunderstorms have been related to big towering cumulonimbus clouds as illustrated by this glorious cloud shot by Dr. Peter Benda, wanting east from Bellevue. Virtually mountains within the sky.
The big cumulonimbus clouds have been related to the method of an upper-level trough (low stress), which induced upward movement (which helps provoke thunderstorms) and cooler air aloft (which helps to advertise a big decline in temperature aloft, which in flip produces instability). Low stage westerly winds pushed the unstable air up the western facet of the Cascades, releasing the convection.
500 hPa (about 18,000 ft) heights, winds, and temperature (colour shaded).
The seen satellite tv for pc picture at 7:01 PM clearly reveals the effervescent thunderstorms on each side of Seattle (the Kitsap had a storm as nicely).
Lots of lightning…however what about snow?
A reasonably robust entrance (white arrow pointing to it) was lurking offshore yesterday afternoon (see seen picture round 5 PM). Behind the entrance was a lot cooler air, one thing made evident by the popcorn-looking instability clouds behind it (they’re produced by cool air shifting over hotter water).
Behind the entrance, the freezing stage dropped to round 5000 ft (snow stage round 4000 ft), however snow within the central Cascades received supercharged by the event of a Puget Sound convergence zone (which fashioned because the winds behind the entrance veered right into a westerly path). The radar imagery this morning round 9 AM reveals the convergence zone extending from Seattle eastward in direction of the Cascades–providing a number of precipitation and serving to to drop the freezing stage additional (melting snow cools the air under).
The scene at Steven Pass at 10 AM this morning was, nicely, wintry and exquisite.
The chilly air will quickly be historical past and dry situations, with temperatures zooming up into the decrease 80s will probably be loved by western WA residents this weekend.