Storm #3 – Desert monsoonal slopover moves in

California has been affected all weekend by a murky sky full of subtropical moisture dragged up from the Golfo de California by the hot air rising, pockmarked with thunderstorms here and there. It follows a very intense heat wave, intense even by mid-summer standards. There’s no prevailing wind at all, lots of moisture in the air. Whenever this happens, late night and morning thunderstorms form over the mid valley, just west of highway 99, never on the sides. The reason is, I figure, is night-time downslope winds pour down both sides of the valley. Where the two downhill winds meet, the air gets forced up. With lots of night-time heat and humidity, that’s enough to touch off a plume of unstable air. This will be where thunderstorms form.

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