The Bay Area is set for a brief but extreme heat wave as temperatures rise dramatically on Thursday and peak at over 100 degrees in Eastern Contra Costa County on Friday. However, relief is swift, with temps expected to drop 6-8 degrees by Saturday and hover in the 70s by midweek. Meteorologists cite a complex weather pattern involving a 'dirty ridge' affecting temperatures across the state, warning of elevated fire conditions as this anomaly unfolds, encapsulating a uniquely fluctuating weather situation for the region.
By Saturday, temperatures may fall 6-8 degrees in some areas and on Sunday, the hottest spots in the region won't get past 85 degrees.
What we've had for a while now is a series of short-wave high-pressure ridges with short upper-wave low-pressure troughs, and that's created a temperature roller-coaster.
Now, the long-range pattern is starting to evolve into what we call a dirty ridge because there's a low-pressure trough off the California-Mexico border near Baja that's affecting how it evolves.
Extreme heat is about to make a return to the Bay Area in time to bid May adieu, but it won't be hanging out for too long.
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