Alert archive / California / Flash Flood Watches in 2017
Flash Flood Watch 4, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood watch at Jan 20, 2017, 1:27 PM PST for 11 counties in California. It took effect at Jan 22, 2017, 12:00 AM PST. It was in force for 38 hr.
The area
The counties it named.
The facts
- Issued
- Jan 20, 2017, 1:27 PM PST (21:27 UTC)
- In effect from
- Jan 22, 2017, 12:00 AM PST
- Expired
- Jan 23, 2017, 2:17 PM PST
- In force
- 38 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Flood severity
- None
Counties Alameda County, CA, City and County of San Francisco, CA, Contra Costa County, CA, Marin County, CA, Monterey County, CA, Napa County, CA, San Benito County, CA, San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA, Sonoma County, CA
The radar
The San Francisco radar (KMUX), 46 km from the middle of the area, began a volume at 21:29 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 9.5 hours before the alert went out and 24 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 774 m above ground
- 0-6 km bulk shear
- 73 kt
- 0-1 km storm-relative helicity
- 501 m²/s²
- 0-3 km storm-relative helicity
- 746 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
491 WGUS66 KMTR 202127 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE SAN FRANCISCO CA 127 PM PST FRI JAN 20 2017 ...FLASH FLOOD WATCH FOR THE ENTIRE SAN FRANCISCO BAY AREA AND CENTRAL COAST... .THE THIRD IN A SERIES OF STRONG STORMS IS EXPECTED TO PRODUCE PERIODS OF MODERATE TO HEAVY RAIN SATURDAY NIGHT THROUGH SUNDAY MORNING. THIS ADDITIONAL RAIN ON ALREADY SATURATED SOILS WILL LIKELY LEAD TO FLASH FLOODING OF AREA STREAMS AND RIVERS AS WELL AS IN LOCAL URBAN AREAS. CAZ006-505>513-516>518-528>530-211200- /O.NEW.KMTR.FF.A.0004.170122T0800Z-170123T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 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...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 127 PM PST FRI JAN 20 2017 ...FLASH FLOOD WATCH IN EFFECT FROM LATE SATURDAY NIGHT THROUGH SUNDAY AFTERNOON... THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A * FLASH FLOOD WATCH 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. * FROM LATE SATURDAY NIGHT THROUGH SUNDAY AFTERNOON * PERIODS OF HEAVY RAIN ON SATURATED SOILS WILL IMPACT THE REGION FROM LATE SATURDAY NIGHT THROUGH SUNDAY AFTERNOON. ADDITIONAL RAINFALL AMOUNTS FROM 0.75 TO 1.5 INCHES ARE POSSIBLE AT LOWER ELEVATIONS WITH 2 TO 4 INCHES ACROSS HIGHER TERRAIN. * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$
7 follow-up statements
465 WGUS66 KMTR 211146 FFAMTR FLOOD WATCH NATIONAL WEATHER SERVICE SAN FRANCISCO CA 346 AM PST SAT JAN 21 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE SAN FRANCISCO BAY AREA AND CENTRAL COAST... .THE THIRD IN A SERIES OF STRONG STORM SYSTEMS IS EXPECTED TO PRODUCE PERIODS OF MODERATE TO HEAVY RAIN LATE TONIGHT THROUGH SUNDAY MORNING. THIS ADDITIONAL RAIN ON ALREADY SATURATED SOILS WILL LIKELY LEAD TO FLASH FLOODING OF AREA STREAMS AND RIVERS AS WELL AS LOCAL URBAN AREAS. CAZ006-505>513-516>518-528>530-212300- /O.CON.KMTR.FF.A.0004.170122T0800Z-170123T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 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...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 346 AM PST SAT JAN 21 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM LATE TONIGHT THROUGH SUNDAY AFTERNOON... THE FLASH FLOOD WATCH CONTINUES 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. * FROM LATE TONIGHT THROUGH SUNDAY AFTERNOON * PERIODS OF HEAVY RAIN ON ALREADY SATURATED SOILS WILL IMPACT THE REGION FROM LATE TONIGHT THROUGH SUNDAY AFTERNOON. ADDITIONAL RAINFALL AMOUNTS FROM 0.75 TO 1.5 INCHES ARE POSSIBLE AT LOWER ELEVATIONS WITH 2 TO 5 INCHES ACROSS THE NORTH BAY AND COASTAL SLOPES. * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$
946 WGUS66 KMTR 212227 FFAMTR FLOOD WATCH NATIONAL WEATHER SERVICE SAN FRANCISCO CA 227 PM PST SAT JAN 21 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE SAN FRANCISCO BAY AREA AND CENTRAL COAST... .ANOTHER STRONG STORM SYSTEM IS EXPECTED TO PRODUCE PERIODS OF MODERATE TO HEAVY RAIN LATE TONIGHT THROUGH SUNDAY MORNING. THIS ADDITIONAL RAIN ON ALREADY SATURATED SOILS WILL LIKELY LEAD TO FLASH FLOODING OF AREA STREAMS AND RIVERS AS WELL AS LOCAL URBAN AREAS. CAZ006-505>513-516>518-528>530-221200- /O.CON.KMTR.FF.A.0004.170122T0800Z-170123T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 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...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 227 PM PST SAT JAN 21 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT FROM MIDNIGHT PST TONIGHT THROUGH SUNDAY AFTERNOON... THE FLASH FLOOD WATCH CONTINUES 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. * FROM MIDNIGHT PST TONIGHT THROUGH SUNDAY AFTERNOON * PERIODS OF HEAVY RAIN ON ALREADY SATURATED SOILS WILL IMPACT THE REGION FROM LATE TONIGHT THROUGH SUNDAY AFTERNOON. ADDITIONAL RAINFALL AMOUNTS FROM 1 TO 2 INCHES ARE POSSIBLE AT LOWER ELEVATIONS WITH 2 TO 5 INCHES ACROSS THE NORTH BAY AND COASTAL SLOPES. * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$
792 WGUS66 KMTR 221150 FFAMTR FLOOD WATCH NATIONAL WEATHER SERVICE SAN FRANCISCO CA 350 AM PST SUN JAN 22 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE SAN FRANCISCO BAY AREA AND CENTRAL COAST THOUGH THIS AFTERNOON... .A STRONG COLD FRONT PUSHING THROUGH THE REGION WILL PRODUCE PERIODS OF MODERATE TO HEAVY RAINFALL THROUGH THIS MORNING. IN ADDITION, SHOWERS AND THUNDERSTORMS ANTICIPATED THIS AFTERNOON WILL ALSO PRODUCE BRIEF HEAVY DOWNPOURS. THIS ADDITIONAL RAINFALL ON ALREADY SATURATED SOILS WILL LIKELY LEAD TO FLASH FLOODING OF AREA STREAMS AND RIVERS AS WELL AS LOCAL URBAN AREAS. CAZ006-505>513-516>518-528>530-230000- /O.CON.KMTR.FF.A.0004.000000T0000Z-170123T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 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...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 350 AM PST SUN JAN 22 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS AFTERNOON... THE FLASH FLOOD WATCH CONTINUES 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 THIS AFTERNOON. * PERIODS OF HEAVY RAIN ON ALREADY SATURATED SOILS WILL IMPACT THE REGION THROUGH THIS AFTERNOON. * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$
914 WGUS66 KMTR 222011 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED FLOOD WATCH NATIONAL WEATHER SERVICE SAN FRANCISCO CA 1211 PM PST SUN JAN 22 2017 ...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. CAZ006-505>513-516>518-528>530-240200- /O.EXT.KMTR.FF.A.0004.000000T0000Z-170124T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 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...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 1211 PM PST SUN JAN 22 2017 ...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. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$ DRP
381 WGUS66 KMTR 231046 FFAMTR FLOOD WATCH NATIONAL WEATHER SERVICE SAN FRANCISCO CA 246 AM PST MON JAN 23 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE SAN FRANCISCO BAY AREA AND CENTRAL COAST THROUGH MONDAY EVENING... .SCATTERED TO NUMEROUS SHOWERS AND POSSIBLE THUNDERSTORMS WILL IMPACT THE REGION THROUGH THIS EVENING. ANY ADDITIONAL RAINFALL, ESPECIALLY BRIEF HEAVY DOWNPOURS IN STRONGER SHOWERS OR THUNDERSTORMS, WILL LIKELY RESULT IN 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 ANY THUNDERSTORMS. CAZ006-505>513-516>518-528>530-240200- /O.CON.KMTR.FF.A.0004.000000T0000Z-170124T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 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...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 246 AM PST MON JAN 23 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... THE FLASH FLOOD WATCH CONTINUES 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 THIS EVENING. * PERIODS OF HEAVY RAIN, POTENTIALLY HEAVY AT TIMES, ON ALREADY SATURATED SOILS AND FULL RESERVOIRS WILL IMPACT THE REGION THROUGH THIS EVENING. * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$
689 WGUS66 KMTR 231053 CCA FFAMTR FLOOD WATCH...CORRECTED NATIONAL WEATHER SERVICE SAN FRANCISCO CA 253 AM PST MON JAN 23 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT FOR THE ENTIRE SAN FRANCISCO BAY AREA AND CENTRAL COAST THROUGH MONDAY EVENING... .SCATTERED TO NUMEROUS SHOWERS AND POSSIBLE THUNDERSTORMS WILL IMPACT THE REGION THROUGH THIS EVENING. ANY ADDITIONAL RAINFALL, ESPECIALLY BRIEF HEAVY DOWNPOURS IN STRONGER SHOWERS OR THUNDERSTORMS, WILL LIKELY RESULT IN 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 ANY THUNDERSTORMS. CAZ006-505>513-516>518-528>530-232300- /O.COR.KMTR.FF.A.0004.000000T0000Z-170124T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ 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- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- 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...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 253 AM PST MON JAN 23 2017 ...FLASH FLOOD WATCH REMAINS IN EFFECT THROUGH THIS EVENING... THE FLASH FLOOD WATCH CONTINUES 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 THIS EVENING. * PERIODS OF HEAVY RAIN ON ALREADY SATURATED SOILS AND FULL RESERVOIRS WILL IMPACT THE REGION THROUGH THIS EVENING. * 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. PRECAUTIONARY/PREPAREDNESS ACTIONS... 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. && $$
915 WGUS66 KMTR 232217 FFAMTR FLOOD WATCH NATIONAL WEATHER SERVICE SAN FRANCISCO CA 217 PM PST MON JAN 23 2017 ...FLASH FLOOD WATCH IS CANCELLED... .SHOWERS WILL CONTINUE THIS EVENING AND OVERNIGHT. HOWEVER WIDESPREAD HEAVY RAIN IS NO LONGER EXPECTED. CAZ006-505>513-516>518-528>530-232330- /O.CAN.KMTR.FF.A.0004.000000T0000Z-170124T0200Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ SAN FRANCISCO- COASTAL NORTH BAY INCLUDING POINT REYES NATIONAL SEASHORE- NORTH BAY INTERIOR VALLEYS-NORTH BAY MOUNTAINS- SAN FRANCISCO BAY SHORELINE-SAN FRANCISCO PENINSULA COAST- EAST BAY INTERIOR VALLEYS-EAST BAY HILLS AND THE DIABLO RANGE- SANTA CRUZ MOUNTAINS-SANTA CLARA VALLEY INCLUDING SAN JOSE- SOUTHERN SALINAS VALLEY/ARROYO SECO AND LAKE SAN ANTONIO- SANTA LUCIA MOUNTAINS AND LOS PADRES NATIONAL FOREST- MOUNTAINS OF SAN BENITO COUNTY AND INTERIOR MONTEREY COUNTY INCLUDING PINNACLES NATIONAL MONUMENT- NORTHERN SALINAS VALLEY/HOLLISTER VALLEY AND CARMEL VALLEY- NORTHERN MONTEREY BAY-SOUTHERN MONTEREY BAY AND BIG SUR COAST- INCLUDING THE CITIES OF...SAN FRANCISCO...TAMALPAIS-HOMESTEAD... SAUSALITO...SANTA ROSA...SOUTH SANTA ROSA...NAPA...SAN RAFAEL... PETALUMA...NOVATO...ROHNERT PARK...ANGWIN... LAGUNITAS-FOREST KNOLLS...WOODACRE...OAKLAND...FREMONT... HAYWARD...DALY CITY...BERKELEY...PACIFICA...CONCORD...ANTIOCH... LIVERMORE...WALNUT CREEK...PLEASANTON...PITTSBURG...SAN RAMON... BLACKHAWK...SCOTTS VALLEY...BOULDER CREEK...DAY VALLEY... SAN JOSE...GREENFIELD...KING CITY...SALINAS...SANTA CRUZ... WATSONVILLE...LIVE OAK...SEASIDE...MONTEREY...MARINA 217 PM PST MON JAN 23 2017 ...FLASH FLOOD WATCH IS CANCELLED... THE FLASH FLOOD WATCH FOR A PORTION OF NORTHERN CALIFORNIA HAS BEEN CANCELLED. SHOWERS WILL CONTINUE THIS EVENING AND OVERNIGHT BUT WIDESPREAD HEAVY RAIN IS NO LONGER EXPECTED. THEREFORE THE FLASH FLOOD WATCH HAS BEEN CANCELLED. $$
What forecasters said that day
The local office's own words before this flash flood watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS San Francisco Bay Area, CA wrote its last area forecast discussion before this flash flood watch went out at Jan 20, 9:21 AM PST, 4 hours 6 minutes earlier.
Area forecast discussion, Jan 20, 9:21 AM PST, 4 hours 6 minutes before
Area Forecast Discussion
National Weather Service San Francisco Bay Area
921 AM PST Fri Jan 20 2017
.SYNOPSIS...A cold front is currently exiting the district but
scattered showers are expected to continue today in the unstable
airmass behind the front. In addition, isolated thunderstorms
will be possible. A few showers will then linger into Saturday
morning with another, likely wetter system arriving late Saturday
into Sunday. Given the antecedent conditions from recent rainfall,
this system will have the potential to result in additional
flooding concerns across portions of the region. Showers will then
linger behind this cold front into Monday with dry conditions
returning by Tuesday.
&&
.DISCUSSION...as of 9:21 AM PST Friday...A fast-moving but robust
cold front moved across the district overnight and this morning,
bringing moderate to heavy rains and gusty winds. Right now, the
front has exited the CWA, but there are showers behind the front
in the unstable airmass. KMUX radar is showing several impressive
echoes just off the San Mateo coast and moving across towards the
San Francisco Bay. This shower activity will persist through the
day and gradually taper off overnight. Wind speeds have decreased
and the wind advisory will be allowed to expire at 10 am, if not
cancelled before then.
By Saturday late morning/early afternoon, showers will likely be
ended with a bit of a break in precipitation for a good portion
of the region.
The next system in this series remains on track to impact the
area from late Saturday into Sunday morning. This system appears
to have a deeper moisture tap with PWAT values forecast to range
between 1 to 1.25 inches. Given this, expecting rainfall amounts
to be greater than the previous two systems which will likely
lead to a greater threat for flooding issues. Additional rainfall
amounts from Saturday into Sunday will range from 0.75 to 1.25
inches in most urban areas and upwards of 2 inches in the North
Bay Valleys. Meanwhile, the coastal ranges and North Bay Mountains
will likely see 2 to 4 inches with isolated amounts upwards of 6
inches. Thus, a Flash Flood Watch will likely be considered for
portions of the district if the forecast models remain consistent,
especially considering a few creeks went to flood stage with last
night's storm. Along with the additional rainfall, southerly winds
will also increase and become gusty at times ahead of the frontal
boundary that will sweep through late Saturday night into early
Sunday morning.
Showers will then likely linger into Sunday night and even through
much of the day Monday as the main mid/upper level low drops
southward down along the northern California coast. By Tuesday, the
trough will shift inland while a ridge begins to develop off of
the West Coast. This ridge will maintain dry weather conditions
through the remainder of next week with temperatures near seasonal
averages.
&&
.AVIATION...As of 5:03 AM PST Friday...A very strong and fast moving
cold front is pressing eastward across the forecast area this morning
accompanied by heavy rain and wind. Pressure falls along the coastal
waters and over land have been commonly 2-3 mb per hour since late
last evening /pressure falling rapidly/. Cold unstable air is quickly
moving in this morning, expect a continuation of heavy showers and
t-storm development through this morning and afternoon. IR imagery
shows lots of open cellular clouds to our W-NW, a signature of plenty
instability to arrive today.
Vicinity of KSFO....Airport weather warning valid through 15z, may
need to extend warning if winds remain strong and gusty. Model guidance
indicates possible lull then re-energized westerly winds developing
later this morning into the afternoon. Expect downpours and possible
additional t-storms with reduced visibilities and ceilings to MVFR
possibly briefly IFR visibilities.
SFO Bridge Approach...Similar to SFO.
Monterey Bay Terminals...Strong and gusty southeast winds prior to
cold front moving through early this morning. MVFR possibly briefly
IFR visibilities in downpours and t-storms.
&&
.MARINE...as of 8:56 AM PST Friday...Strong southerly gale force
winds will continue across the coastal waters through this morning
ahead of an approaching cold front. As a result rough and
hazardous seas will continue through today. After the front passes
this morning winds will shift to the west but remain moderate and
gusty. Winds will increase again Saturday night as another frontal
system approaches. Very large swells arrive Friday afternoon with
swell heights building to 25 to 30 feet Friday night and Saturday.
Rogue waves of 30 feet or greater are possible during this
timeframe.
&&
.MTR WATCHES/WARNINGS/ADVISORIES...
.Tday...Wind Advisory...CAZ006-505-507-509-511-512-517-518-529-530
High Surf Warning...CAZ006-505-509-529-530
SCA...Mry Bay
SCA...Pt Arena to Pt Reyes 0-10 nm
SCA...Pt Reyes to Pigeon Pt 0-10 nm
SCA...Pigeon Pt to Pt Pinos 0-10 nm
SCA...Pt Pinos to Pt Piedras Blancas 0-10 nm
SCA...Pt Arena to Pigeon Pt 10-60 nm
SCA...Pigeon Pt to Pt Piedras Blancas 10-60 nm
SCA...Rough Bar Advisory for SF Bar
SCA...SF Bay
&&
PUBLIC FORECAST: Sims
AVIATION: Canepa
MARINE: CW
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www.twitter.com/nwsbayareaThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 19, 9:01 PM PST | Gale Warning | MTR | 10 hr | |
| Jan 19, 9:01 PM PST | Small Craft Advisory | MTR | 42 hr | |
| Jan 20, 1:26 AM PST | Areal Flood Advisory | MTR | Marin, Sonoma | 3 hr |
| Jan 20, 3:02 AM PST | Special Marine Warning | MTR | 43 min | |
| Jan 20, 3:39 AM PST | Special Weather Statement | MTR | San Mateo | 36 min |
| Jan 20, 4:07 AM PST | Special Marine Warning | MTR | 23 min | |
| Jan 20, 4:14 AM PST | Special Weather Statement | MTR | Alameda, Contra Costa, San Mateo | 31 min |
| Jan 20, 4:49 AM PST | Flash Flood Warning | MTR | Sonoma | 4 hr |
| Jan 20, 5:27 AM PST | Areal Flood Advisory | MTR | San Mateo, Santa Clara, Santa Cruz | 3 hr |
| Jan 20, 6:38 AM PST | Flash Flood Warning | MTR | Santa Cruz | 6 hr |
| Jan 20, 7:08 AM PST | Flash Flood Warning | MTR | Santa Clara | 6 hr |
| Jan 20, 7:31 AM PST | Areal Flood Warning | MTR | Santa Cruz | 12 hr |
| Jan 20, 7:55 AM PST | Areal Flood Warning | MTR | Sonoma | 18 hr |
| Jan 20, 12:20 PM PST | Flash Flood Warning | MTR | San Benito | 4 hr |
| Jan 20, 12:51 PM PST | High Wind Watch | MTR | Alameda, Contra Costa, Marin, Monterey, Napa, San Benito and 5 more | 15 hr |
| Jan 20, 2:33 PM PST | Gale Watch | MTR | 14 hr | |
| Jan 20, 2:33 PM PST | Gale Warning | MTR | 42 hr | |
| Jan 20, 3:51 PM PST | Areal Flood Advisory | MTR | San Benito, Santa Clara | 70 hr |
| Jan 20, 3:56 PM PST | Areal Flood Warning | MTR | San Benito, Santa Clara | 72 hr |
Nearby
Flash Flood Watches in California, 2017Every flash flood watch in 2017
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.