Southern California Weather Force has issued a hazardous weather outlook that starts on the night (overnight) of August 28th and goes from then through September 1st for an increase in shower and thunderstorm activity for the Eastern half of Southern California. An upper level low is set to pull in moisture from what will be Tropical Storm or Hurricane Nora by around Saturday.
As this pulls northward, Arizona has already been taken care of with their forecast over at Arizona Weather Force. But for our area, the upper level system does look like it will have upper dynamics with it, enough so to warrant the chance of thunderstorms capable of flooding all the way into the San Diego forecast zones, north to the Inland Empire, northeast to Big Bear, and further to Las Vegas with the Morongo Basin, Low Deserts, and Colorado River Valley in the risk as well.
Southern California Weather Force flood risk model does paint a mostly notable risk during this period for those locations, with a higher risk in the San Diego County Mountain areas. This risk does not go further west than about Riverside or March Air Base.
Given what I see, the stronger dynamics do hit Las Vegas more so on Monday and Tuesday, San Diego proper on Sunday, and San Diego Mountains both Sunday and Monday. This is about what I would time these locations are. As always I will have updates the morning of the events on the e-mailed micro-climate alert system or the SCWF Facebook Group (not page unless it affects more people) …
The following map below is of the larger image of the SCWF flood risk model for this event – and it is clickable –
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