Napa County Under Flood Watch

NAPA COUNTY, CA — Napa County residents should monitor later forecasts and be alert for possible flood warnings Friday and Saturday, the National Weather Service said.

A flood watch is expected to go into effect Friday afternoon and continue through Saturday afternoon during the significant rainfall forecast for the Marin Coastal Range, Sonoma Coastal Range, North Bay interior mountains, Coastal North Bay including Point Reyes National Seashore and North Bay interior valleys.

The cities and towns under flood watch are Tamalpais-Homestead, Novato, South Santa Rosa, Rohnert Park, Napa, Santa Rosa, San Rafael, Sausalito, Woodacre, Lagunitas-Forest Knolls, Petaluma and Angwin.

Expected rainfall totals are 2-3 inches in the valleys and up to 5 inches in the higher elevations. Excessive runoff may result in flooding of rivers, creeks, streams and other low-lying and flood-prone locations. Creeks and streams may rise out of their banks, and flooding may occur in poor drainage and urban areas, the weather service said. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Flooding of the Napa River is not expected in Napa or Saint Helena during this storm. The river is forecast to peak at 14.30 feet Saturday night, up from 3.61 feet Wednesday. Minor flood stage does not begin in Napa until the river reaches 25 feet.

The Napa River in Saint Helena is expected to rise to 8.74 feet on Saturday. Minor flood stage in Saint Helena does not start until the river rises to 18 feet.

Coastal Flood Advisory

A National Weather Service coastal flood advisory was also issued. It remains in effect from 6 a.m. Thursday to 1 p.m. Monday.

Minor coastal flooding is expected along San Francisco Bay and San Pablo Bay. Parking lots, parks and roads are forecast to flood. Isolated road closures are expected.

Tidal levels are increasing as a result of higher astronomical tides. Low-lying areas within the San
Francisco Bay Area may see minor flooding during the following high tides:

• 6.74 feet at 8:12 a.m. Thursday
• 6.98 feet at 8:54 a.m. Friday
• 7.07 feet at 9:37 a.m. Saturday
• 7.02 feet at 10:22 a.m. Sunday
• 6.82 feet at 11:08 a.m. Monday

Those who need to travel should allow extra time as roads may be closed. Drivers should not go around barricades or through water of unknown depth, the weather service said.

7-Day Napa County Weather Outlook

Thursday

Rain likely, mainly between 10am and 3pm. Cloudy, with a high near 50. West southwest wind 7 to 15 mph, with gusts as high as 18 mph. Chance of precipitation is 70%. New precipitation amounts between a tenth and quarter of an inch possible.

Thursday Night
A chance of rain before 10pm, then rain likely after 3am. Patchy fog after 2am. Otherwise, mostly cloudy, with a low around 42. South southwest wind around 6 mph becoming calm in the evening. Chance of precipitation is 60%. New precipitation amounts of less than a tenth of an inch possible.

Friday
Rain likely, mainly after 4pm. Cloudy, with a high near 50. East wind 5 to 11 mph becoming south in the morning. Chance of precipitation is 60%. New precipitation amounts between a tenth and quarter of an inch possible.

Friday Night
Rain. Low around 46. South wind 16 to 21 mph, with gusts as high as 25 mph. Chance of precipitation is 80%. New precipitation amounts between three quarters and one inch possible.

Saturday
Rain, mainly before 4pm. The rain could be heavy at times. High near 51. Chance of precipitation is 100%. New precipitation amounts between 1 and 2 inches possible.

Saturday Night
A 50 percent chance of rain, mainly before 10pm. Mostly cloudy, with a low around 39.

Sunday
Mostly sunny, with a high near 51.

Sunday Night
A chance of rain after 4am. Mostly cloudy, with a low around 40.

Monday
Rain, mainly after 10am. Mostly cloudy, with a high near 47.

Monday Night
Rain likely. Mostly cloudy, with a low around 43.

Tuesday
Partly sunny, with a high near 55.

Tuesday Night
Partly cloudy, with a low around 41.

Wednesday
Mostly sunny, with a high near 56.