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Special Weather Statement

Special Weather Statement
National Weather Service San Francisco Bay Area
457 PM PDT Thu Oct 21 2021

CAZ006-505>513-517-528>530-221100-
San Francisco-
Coastal North Bay Including Point Reyes National Seashore-
North Bay Interior Valleys-North Bay Mountains-
San Francisco Bay Shoreline-San Francisco Peninsula Coast-
East Bay Interior Valleys-East Bay Hills and the Diablo Range-
Santa Cruz Mountains-Santa Clara Valley Including San Jose-
Santa Lucia Mountains and Los Padres National Forest-
Northern Salinas Valley/Hollister Valley and Carmel Valley-
Northern Monterey Bay-Southern Monterey Bay and Big Sur Coast-
Including the cities of San Francisco, Tamalpais-Homestead,
Sausalito, Santa Rosa, South Santa Rosa, Napa, San Rafael,
Petaluma, Novato, Rohnert Park, Angwin, Lagunitas-Forest Knolls,
Woodacre, Oakland, Fremont, Hayward, Daly City, Berkeley,
Pacifica, Concord, Antioch, Livermore, Walnut Creek, Pleasanton,
Pittsburg, San Ramon, Blackhawk, Scotts Valley, Boulder Creek,
Day Valley, San Jose, Salinas, Santa Cruz, Watsonville, Live Oak,
Seaside, Monterey, and Marina
457 PM PDT Thu Oct 21 2021

...Two storm systems to impact the Bay Area and Central Coast
through Monday...

Light rain is already falling in the North Bay and will continue
overnight. A cold front will reach the North Bay after midnight
and bring a band of rain through the Bay Area for the Friday
morning commute. Inland locations that haven`t received much rain
the last few days should expect to receive some light rainfall
Friday morning. The morning commute will be adversely impacted
with wet roadways. Slow down, use wipers and headlights and plan
for extra time to reach your destination Friday morning.

A brief break in the weather as dry weather returns Friday
afternoon through Saturday afternoon. Use this window of time for
any storm preparations.

Light rain will start in the North Bay Saturday evening. By Sunday
morning rain will become heavy in the North Bay as the long
awaited atmospheric river takes aim at Northern California. The
band of heavy rain is then forecast to drift southward through the
Bay Area during the day Sunday reaching the Santa Cruz Mountains
by late afternoon. The heavy rain will then drift into the Central
Coast by Sunday evening as precip begins to wind down across the
greater Bay Area.

Several inches of rainfall are forecast across the region with
higher amounts in the hills. Now is the time to clear storm drains
and gutters. In addition to heavy rain, a period of gusty winds
will accompany the front on Sunday. Drought stressed trees will be
susceptible to toppling leading to possible power outages. Burn
scars throughout the state will be prone to debris flows with
likely significant impacts across the Sierra. Plan your travel
accordingly. Rain will taper to showers by Monday.

$$



U.S. Dept. of Commerce
NOAA National Weather Service
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Silver Spring, MD 20910
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Page last modified: May 16, 2007
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