Lamorinda Under Flood Advisory As Atmospheric River Pounds Bay Area

LAMORINDA, CA —A National Weather Service flood advisory was issued early Tuesday for Orinda, Moraga, Lafayette and elsewhere in western Contra Costa County and northwestern Alameda County.

Heavy rain in the early-morning hours was forecast to cause urban and small stream flooding in low-lying and poor drainage areas.

"Up to 0.5 inches of rain have fallen," the National Weather Service said. "Additional rainfall amounts of 1 to 2 inches are expected over the area. This additional rain will result in minor flooding."

The flood advisory was set to expire at 5 a.m. Tuesday. However, a flood watch was expected to remain in effect for Lamorinda and the East Bay through 4 a.m. Wednesday.

"You should monitor later forecasts and be alert for possible Flood Warnings," the weather service said. "Those living in areas prone to flooding should be prepared to take action should flooding develop."

Initial rain late last week and over the weekend helped saturate soils and prime portions of the Bay Area for increase flooding potential as an atmospheric river moves through.

"Flooding caused by excessive rainfall continues to be possible," the weather service said. "Excessive runoff may result in flooding of rivers, creeks, streams and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas."

The flood watch encompasses the counties of Sonoma, Napa, Marin, San Francisco, San Mateo, Contra Costa, Alameda, Santa Clara, Santa Cruz, San Benito and Monterey.

The weather service also issued a wind advisory for the East Bay and Bay Area until 11 p.m. Tuesday. South winds 20-30 mph with gusts up to 60 mph are forecast.

"Gusty winds will blow around unsecured objects," the weather service said. "Tree limbs could be blown down and a few power outages may result."

7-Day Weather Outlook For Lamorinda

Tuesday

Rain before 10am, then showers between 10am and 4pm, then showers and possibly a thunderstorm after 4pm. High near 58. Breezy, with a south wind 14 to 24 mph, with gusts as high as 47 mph. Chance of precipitation is 100%. New rainfall amounts between 1 and 2 inches possible.

Tuesday Night
Showers and possibly a thunderstorm before 7pm, then showers between 7pm and 10pm. Low around 38. West wind 8 to 11 mph, with gusts as high as 26 mph. Chance of precipitation is 100%. New precipitation amounts between a quarter and half of an inch possible.

Wednesday
Sunny, with a high near 53. South southwest wind 5 to 7 mph becoming west in the morning.

Wednesday Night
Rain, mainly after 4am. Low around 38. Light and variable wind. Chance of precipitation is 80%. New precipitation amounts of less than a tenth of an inch possible.

Thursday
Rain. High near 49. Chance of precipitation is 90%. New precipitation amounts between a half and three quarters of an inch possible.

Thursday Night
Rain, mainly before 4am. Low around 41. Chance of precipitation is 90%.

Friday
A chance of rain before 10am. Mostly sunny, with a high near 53.

Friday Night
Mostly clear, with a low around 35.

Saturday
Sunny, with a high near 54.

Saturday Night
Mostly clear, with a low around 36.

Sunday
Sunny, with a high near 55.

Sunday Night
Mostly clear, with a low around 37.

Monday
Sunny, with a high near 55.