US: Flash flood warning in effect for parts of San Diego County, California until at least 11:30 Jan. 22

The US National Weather Service (NWS) has issued a flash flood warning for parts of San Diego County, California, including Oceanside, Carlsbad, Vista, and Solana Beach, north of the city of San Diego through at least 11:30 Jan. 22. Officials could amend or expand the warning to the surrounding areas on short notice.

Sustained heavy rainfall could trigger flooding in low-lying communities near rivers, streams, and creeks. Urban flooding is also possible in developed areas with easily overwhelmed stormwater drainage systems. Sites downstream from large reservoirs or rivers may be subject to flash flooding after relatively short periods of intense rainfall. Landslides are possible in hilly or mountainous areas, especially where the soil has become saturated by heavy rainfall.

Localized business disruptions may occur in low-lying areas; some businesses might not operate at full capacity because of flood damage to facilities, possible evacuations, and some employees' inability to reach work sites. Transport, electricity, and telecommunications disruptions are also possible in areas impacted by flooding.