- Associated Press - Monday, September 21, 2015

LOS ANGELES (AP) - Southern California is in for more end-of-summer heat and then a chance of showers and thunderstorms.

The National Weather Service says Monday will be about 10 degrees above normal, but below Sunday’s blistering highs, which included records ranging from 100 degrees at Long Beach Airport to 105 at the Paso Robles airport.

Forecasters say things will then change as a low-pressure system off northern Baja California combines with subtropical moisture.

Flash-flood watches will be in effect through Tuesday afternoon for valleys of San Diego, Riverside and San Bernardino counties. Los Angeles County will have a chance of thunderstorms.

The weather service says rainfall rates will be highly variable, and impacts could include roadway flooding, local flash floods in the mountains and deserts, debris flows and lightning on the beaches.

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