NOAA's National Weather Service
Weather Alerts for San Francisco   (CAC075)

icn  FLASH FLOOD WATCH
SAN FRANCISCO   (CAC075)

Effective: Sun, Jan 22, 2017 12:11pm PST Severity: Severe
Updated: Sun, Jan 22, 2017 12:11pm PST Urgency: Expected
Expires: Mon, Jan 23, 2017 06:00pm PST Certainty: Possible

Areas Affected: Coastal North Bay Including Point Reyes National Seashore; East Bay Hills and the Diablo Range; East Bay Interior Valleys; Mountains Of San Benito County And Interior Monterey County Including Pinnacles National Monument; North Bay Interior Valleys; North Bay Mountains; Northern Monterey Bay; Northern Salinas Valley, Hollister Valley and Carmel Valley; San Francisco; San Francisco Bay Shoreline; San Fransisco Peninsula Coast; Santa Clara Valley Including San Jose; Santa Cruz Mountains; Santa Lucia Mountains and Los Padres National Forest; Southern Monterey Bay and Big Sur Coast; Southern Salinas Valley, Arroyo Seco and Lake San Antonio
 
Alert:
...FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE SAN
FRANCISCO BAY AREA AND CENTRAL COAST THOUGH MONDAY EVENING...
.A COLD FRONT PUSHED THROUGH THE REGION EARLY SUNDAY MORNING
BRINING PERIODS OF MODERATE TO HEAVY RAINFALL. THE AREA IS NOW IN
THE UNSTABLE POST FRONTAL ENVIRONMENT. SHOWERS AND
THUNDERSTORMS ARE ANTICIPATED TO MOVE INLAND THIS AFTERNOON BEFORE
STRENGTHENING INTO THIS EVENING. ADDITIONAL SHOWERS AND
THUNDERSTORMS WILL MOVE THROUGH THE AREA TONIGHT AND THROUGH
MONDAY. THIS ADDITIONAL RAINFALL ON ALREADY SATURATED SOILS AND
FULL RESERVOIRS WILL LIKELY LEAD TO FLASH FLOODING OF AREA STREAMS
AND RIVERS AS WELL AS LOCALIZED URBAN AREAS. MUD/ROCK SLIDES AND
DOWNED TREES SHOULD ALSO BE EXPECTED... ESPECIALLY DURING INTENSE
BURSTS OF RAINFALL THAT OCCUR DURING THUNDERSTORMS.
...FLASH FLOOD WATCH NOW IN EFFECT THROUGH MONDAY AFTERNOON...
THE FLASH FLOOD WATCH IS NOW IN EFFECT FOR
* A PORTION OF WESTERN CALIFORNIA...INCLUDING THE FOLLOWING
AREAS...COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL
SEASHORE...EAST BAY HILLS AND THE DIABLO RANGE...EAST BAY
INTERIOR VALLEYS...MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR
MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT...NORTH
BAY INTERIOR VALLEYS...NORTH BAY MOUNTAINS...NORTHERN MONTEREY
BAY...NORTHERN SALINAS VALLEY/HOLLISTER VALLEY AND CARMEL
VALLEY...SAN FRANCISCO...SAN FRANCISCO BAY SHORELINE...SAN
FRANCISCO PENINSULA COAST...SANTA CLARA VALLEY INCLUDING SAN
JOSE...SANTA CRUZ MOUNTAINS...SANTA LUCIA MOUNTAINS AND LOS
PADRES NATIONAL FOREST...SOUTHERN MONTEREY BAY AND BIG SUR
COAST AND SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN
ANTONIO.
* THROUGH MONDAY AFTERNOON
* PERIODS OF HEAVY RAIN ON ALREADY SATURATED SOILS AND FULL
RESERVOIRS WILL IMPACT THE REGION BEGINNING THIS AFTERNOON AND
LASTING THROUGH MONDAY.
* THE PRIMARY IMPACTS WILL BE LOCALIZED PONDING OF WATER ON LOW
LYING ROADWAYS WITH POOR DRAINAGE...RAPID RISES ON STREAMS AND
CREEKS WITH SOME LIKELY EXCEEDING BANKFULL...SOME RIVER
FLOODING...AND POTENTIAL ROCK AND MUD SLIDES. RECENT BURN
SCARS WILL ALSO BE SUSCEPTIBLE TO DEBRIS FLOWS DURING PERIODS
OF INTENSE RAINFALL.
Instructions:
A FLASH FLOOD WATCH MEANS THAT CONDITIONS MAY DEVELOP THAT LEAD
TO FLASH FLOODING. FLASH FLOODING IS A VERY DANGEROUS SITUATION.
YOU SHOULD MONITOR LATER FORECASTS AND BE PREPARED TO TAKE ACTION
SHOULD FLASH FLOOD WARNINGS BE ISSUED.

 

icn  HIGH SURF ADVISORY
SAN FRANCISCO   (CAC075)

Effective: Sun, Jan 22, 2017 05:50pm PST Severity: Minor
Updated: Sun, Jan 22, 2017 05:50pm PST Urgency: Expected
Expires: Tue, Jan 24, 2017 03:00am PST Certainty: Likely

Areas Affected: Coastal North Bay Including Point Reyes National Seashore; Northern Monterey Bay; San Francisco; San Fransisco Peninsula Coast; Southern Monterey Bay and Big Sur Coast
 
Alert:
LARGE AND DANGEROUS SWELLS CONTINUE ALONG THE COAST WITH SWELLS
STILL IN THE 15 TO 20 FOOT RANGE. THESE SWELLS WILL CONTINUE
THROUGH TUESDAY MORNING BEFORE SLOWLY DECREASING.
...HIGH SURF ADVISORY REMAINS IN EFFECT UNTIL 3 AM PST TUESDAY...
* SWELL...WEST SWELL 14 TO 18 FEET. SWELL PERIODS 15 SECONDS.
* SURF...BREAKER HEIGHTS 25 TO 30 FT.
* TIMING...CONTINUING THROUGH EARLY TUESDAY MORNING.
* IMPACTS...LARGE BREAKING WAVES...STRONG RIP CURRENTS...AND
SNEAKER WAVES.
A HIGH SURF ADVISORY MEANS THAT HIGH SURF WILL AFFECT BEACHES IN
THE ADVISORY AREA...PRODUCING RIP CURRENTS AND LOCALIZED BEACH
EROSION.
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