Possible rain and thunderstorms are prompting flash flood warnings for parts of Southern California.
A flash flood watch is in effect in the San Bernardino and Riverside County valleys and the Inland Empire through Tuesday afternoon.
"If thunderstorms develop, some potential impacts will include urban roadway flooding, localized flash flooding in the mountains and desert, a threat of debris flows in recent burn areas, and dangerous lightning along the beaches," said a National Weather Service statement. "Showers and thunderstorms will also be possible over the coastal waters and Catalina Island."
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Forecasters predict rainfall in excess of an inch in the deserts and valleys around Riverside, and more than two inches in the mountains. Places in and below recently burned areas will be particularly susceptible to heavy runoff and debris flows should thunderstorms develop.
Forecasters advised residents with outdoor plans or who live near a flood-prone area to "be alert to rapidly changing weather conditions."
Temperatures are expected to remain high once again, reaching into the 90s in several communities.
Temps will cool off seven to ten degrees Tuesday, before climbing back up later in the week.