The flood watch will begin at 9 a.m. Monday and be in effect until Monday night. It is in effect in the San Diego County coastal areas, deserts, mountains and valleys.
Flooding may occur in poor drainage and urban areas. The NWS recommends monitoring forecasts throughout the day for possible flood warnings. Those in flood prone areas should be prepared to evacuate if flooding develops.
Heavy rain is expected to develop Monday morning with a slight chance of thunderstorms.
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