LOS ANGELES (CBSLA.com) — Temperatures are expected to remain abnormally high on Monday as a low-pressure system, combined with sub-tropical moisture, will bring showers and possible thunderstorms to Southern California.

According to the National Weather Service, the forecast does not call for precipitation during the daytime hours in Los Angeles County at this time.

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However, a 30 percent chance for showers and thunderstorms remains possible at night.

The forecast calls for a slight chance of showers and thunderstorms in Orange County this morning and afternoon, with a 60 percent chance for storms in the evening.

A flash flood watch will go into effect from 11 a.m. today until 5 p.m. on Tuesday for Fontana, Moreno Valley, Riverside and San Bernardino.

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Sweltering temperatures are expected to reach 94 degrees in downtown Los Angeles, 96 degrees in Woodland Hills and 97 degrees in Palmdale and Lancaster.

A heat alert was issued by the Los Angeles County Department of Public Health for the Los Angeles Basin, eastern San Gabriel Valley and San Fernando Valley. Precautions were recommended for older adults, caretakers of infants and children, people sensitive to heat, schools, day camps and other sports organizations.

Meteorologists explained humidity levels should remain normal.

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