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The National Weather Service has issued a flood advisory in the San Francisco Bay Area which includes Contra Costa County. The advisory was issued at 4:28 am and is expected to be in effect until around 7:30 am.
The warning also means that you should allow extra time to get to work because of heavy water on the roadways from runoff.
FLOOD ADVISORY NATIONAL WEATHER SERVICE SAN FRANCISCO CA 428 AM PST FRI FEB 28 2014 CAC001-013-053-069-075-081-085-087-281530- /O.NEW.KMTR.FA.Y.0010.140228T1228Z-140228T1530Z/ /00000.N.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 428 AM PST FRI FEB 28 2014 THE NATIONAL WEATHER SERVICE SAN FRANCISCO BAY AREA HAS ISSUED AN * URBAN AND SMALL STREAM FLOOD ADVISORY FOR... MONTEREY COUNTY IN WESTERN CALIFORNIA... SAN BENITO COUNTY IN WESTERN CALIFORNIA... SANTA CLARA COUNTY IN WESTERN CALIFORNIA... ALAMEDA COUNTY IN WESTERN CALIFORNIA... CONTRA COSTA COUNTY IN WESTERN CALIFORNIA... SANTA CRUZ COUNTY IN WESTERN CALIFORNIA... SAN MATEO COUNTY IN WESTERN CALIFORNIA... SAN FRANCISCO COUNTY IN WESTERN CALIFORNIA... * UNTIL 730 AM PST. * LOCATIONS IN THE ADVISORY INCLUDE BUT ARE NOT LIMITED TO ALAMO... ANTIOCH...BLACKHAWK...BRENTWOOD...CLAYTON...CONCORD...DANVILLE... DISCOVERY BAY...EL CERRITO...EL SOBRANTE...KENSINGTON... LAFAYETTE...MARTINEZ...MORAGA TOWN...OAKLEY...ORINDA...PITTSBURG... PLEASANT HILL...RICHMOND...RODEO...SAN PABLO...SAN RAMON...TARA HILLS...WALNUT CREEK...WEST PITTSBURG...ASHLAND...BERKELEY...CASTRO VALLEY...CHERRYLAND...DUBLIN...FAIRVIEW...FREMONT...HAYWARD... LIVERMORE...NEWARK...OAKLAND...PIEDMONT...PLEASANTON...SAN LEANDRO...SAN LORENZO...UNION CITY...CAMPBELL...CUPERTINO...EAST FOOTHILLS...GILROY...LOS ALTOS...LOS ALTOS HILLS...LOS GATOS... MILPITAS...MORGAN HILL...MOUNTAIN VIEW...PALO ALTO...SAN JOSE... SANTA CLARA...SARATOGA...STANFORD...SUNNYVALE...ATHERTON... BELMONT...BURLINGAME...DALY CITY...EAST PALO ALTO...EL GRANADA... FOSTER CITY...HILLSBOROUGH...MENLO PARK...MILLBRAE...NORTH FAIR OAKS...PACIFICA...REDWOOD CITY...SAN BRUNO...SAN CARLOS...SAN MATEO...WOODSIDE...APTOS...BEN LOMOND...BOULDER CREEK...CAPITOLA... CORRALITOS...FELTON...FREEDOM...INTERLAKEN...LIVE OAK...SANTA CRUZ...SCOTTS VALLEY...SOQUEL...WATSONVILLE...CASTROVILLE...DEL MONTE FOREST...MARINA...MONTEREY...PRUNEDALE...SEASIDE...ALAMEDA... ALBANY...ANO NEUVO STATE RESERVE...BIG BASIN REDWOODS STATE PARK... BONNY DOON...CARMEL-BY-THE-SEA...CARMEL HIGHLANDS...DAVENPORT... EMERYVILLE...HALF MOON BAY...HENRY COE STATE PARK...HERCULES...LA HONDA...MOUNT DIABLO STATE PARK...MT. HAMILTON...OPAL CLIFFS... PESCADERO...PINOLE...RIO DEL MAR...SAN FRANCISCO AIRPORT...SAN GREGORIO...SOUTH SAN FRANCISCO...TWIN LAKES AND UVAS CANYON PARK. * AT 426 AM PST AUTOMATED RAINGAGE AND DOPPLER RADAR DATA INDICATED RAINFALL RATES IN EXCESS OF A HALF INCH PER HOUR MOVING OVER THE ADVISORY AREA... EXCESS RUNOFF FROM HEAVY RAINFALL IS EXPECTED TO CAUSE PONDING OF WATER IN URBAN AREAS...HIGHWAYS...STREETS AND UNDERPASSES AS WELL AS OTHER POOR DRAINAGE AREAS AND LOW LYING SPOTS. ALSO...SMALL CREEKS AND STREAMS COULD FLOOD QUICKLY...POSSIBLY COVERING ROADS AND NEARBY LOW AREAS. ALLOW EXTRA TIME TO GET TO YOUR DESTINATION. IF WATER COVERS THE ROADWAY DO NOT CROSS IT. FLOOD WATERS ARE USUALLY DEEPER THAN THEY APPEAR AND THE WATER MAY BE TOO DEEP TO ALLOW YOUR VEHICLE TO CROSS SAFELY. A FLOOD ADVISORY MEANS THAT ALTHOUGH STREAMS AND CREEKS MAY BE ELEVATED OR EVEN RISE OUT OF THEIR BANKS...PROPERTY DAMAGE SHOULD BE MINIMAL. INCONVENIENCES CAN BE EXPECTED BUT THE FLOODING WILL NOT BE IMMEDIATELY LIFE THREATENING. TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.