Outflow from thunderstorms over northwest Mexico has pushed an outflow boundary across Imperial County and into the San Diego County deserts and the southern end of the Coachella Valley.
This is the leading edge of the monsoonal moisture that will continue to spread into southwest California from the southeast through Monday. This moisture may be sufficient for a few thunderstorms over the mountains this afternoon. Moisture is limited and mostly above 600 mb.
Any thunderstorms that do develop this afternoon over the mountains and upper deserts could have some dry lightning strikes and strong gusty winds to around 40 miles per hour.
Rainfall is expected to be limited. The increasing monsoonal moisture will take a slight edge off the heat today with the greatest decrease in temperatures in the lower deserts. For tonight...a greater influx of moisture from the southeast is expected.
This could bring a few showers or isolated thunderstorms late tonight into early Monday morning mainly across about the southeast half of the forecast area. This increased moisture will bring a chance of thunderstorms Monday afternoon and early evening to the mountains and deserts. A little greater cooling for most areas is expected for Monday from the increasing moisture. A weaker additional influx of moisture from the southeast is shown for late Monday night into early Tuesday.
This will continue the chance for thunderstorms in the mountains and deserts Tuesday afternoon and early evening.
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