Alert archive / California / Flash Flood Warnings in 2014
Flash Flood Warning 3, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 28, 2014, 6:55 AM PST for San Mateo County, Santa Clara County, Santa Cruz County, California. It was in force for 35 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Feb 28, 2014, 6:55 AM PST (14:55 UTC)
- Expired
- Feb 28, 2014, 7:30 AM PST
- In force
- 35 min
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Storm-based polygon
- Flood severity
- None
Counties San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 40 km from the middle of the area, began a volume at 14:56 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, 2.9 hours before the alert went out and 31 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
- 522 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 106 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
713
WGUS56 KMTR 281455
FFWMTR
CAC081-085-087-281530-
/O.NEW.KMTR.FF.W.0003.140228T1455Z-140228T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
655 AM PST FRI FEB 28 2014
THE NATIONAL WEATHER SERVICE IN THE SAN FRANCISCO BAY AREA HAS
ISSUED A
* FLASH FLOOD WARNING FOR...
SAN MATEO COUNTY IN WESTERN CALIFORNIA...
THIS INCLUDES THE CITIES OF...REDWOOD CITY...MENLO PARK...EAST PALO
ALTO...
SANTA CLARA COUNTY IN WESTERN CALIFORNIA...
THIS INCLUDES THE CITIES OF...PALO ALTO...MOUNTAIN VIEW...LOS
ALTOS...
SANTA CRUZ COUNTY IN WESTERN CALIFORNIA...
* UNTIL 730 AM PST.
* AT 649 AM PST...NWS DOPPLER RADAR INDICATED AN AREA OF MODERATE TO
HEAVY RAIN SOUTH OF HIGHWAY 35 OR 9 MILES SOUTHWEST OF
CUPERTINO...MOVING NORTHEAST AT 25 MPH.
* OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO LOS
ALTOS HILLS...WOODSIDE...STANFORD...ATHERTON AND PORTIONS OF HIGHWAY
35...HIGHWAY 101 AND INTERSTATE 280.
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT.
RUNOFF FROM HEAVY RAINFALL WILL CAUSE LOCALIZED FLOODING OF SMALL
CREEKS AND STREAMS AS WELL AS ROADWAYS...UNDERPASSES AND OTHER LOW
LYING SPOTS. DO NOT ATTEMPT TO CROSS SWIFTLY FLOWING WATER OR WATER
OF UNKNOWN DEPTH. TURN AROUND...DONT DROWN.
IT IS IMPORTANT FOR CAMPERS AND HIKERS TO KNOW WHERE THEY ARE
RELATIVE TO CREEKS...STREAMS...OR RIVERS WHICH CAN BECOME DANGEROUS
IN HEAVY RAINS. BE PARTICULARLY AWARE IN HILLY TERRAIN WHERE MANY LOW
WATER CROSSINGS CAN QUICKLY BECOME KILLERS.
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE
UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS
SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
TO REPORT FLOODING...HAVE THE NEAREST LAW ENFORCEMENT AGENCY RELAY
YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE.
LAT...LON 3755 12226 3752 12217 3751 12216 3751 12213
3750 12212 3749 12212 3748 12211 3748 12208
3746 12205 3719 12210 3721 12231
$$
MM2 follow-up statements
316
WGUS76 KMTR 281518
FFSMTR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
718 AM PST FRI FEB 28 2014
CAC081-085-087-281530-
/O.CON.KMTR.FF.W.0003.000000T0000Z-140228T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA CLARA CA-SANTA CRUZ CA-SAN MATEO CA-
718 AM PST FRI FEB 28 2014
...A FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 730 AM PST FOR SAN
MATEO...SANTA CRUZ AND SANTA CLARA COUNTIES...
AT 711 AM PST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THE
HEAVIEST RAINFALL HAS DIMINISHED AND EXITED THE AREA BUT EXCESSIVE
RAINFALL RUN OFF MAY STILL PRODUCING FLASH FLOODING IN THE WARNED
AREA.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS
SAFELY. MOVE TO HIGHER GROUND.
MOST FLOOD DEATHS OCCUR IN AUTOMOBILES. NEVER DRIVE YOUR VEHICLE INTO
AREAS WHERE THE WATER COVERS THE ROADWAY. FLOOD WATERS ARE USUALLY
DEEPER THAN THEY APPEAR. JUST ONE FOOT OF FLOWING WATER IS POWERFUL
ENOUGH TO SWEEP VEHICLES OFF THE ROAD. WHEN ENCOUNTERING FLOODED
ROADS MAKE THE SMART CHOICE...TURN AROUND...DONT DROWN.
&&
LAT...LON 3755 12226 3752 12217 3751 12216 3751 12213
3750 12212 3749 12212 3748 12211 3748 12208
3746 12205 3719 12210 3721 12231
$$
MM923
WGUS76 KMTR 281528
FFSMTR
FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
728 AM PST FRI FEB 28 2014
CAC081-085-087-281532-
/O.EXP.KMTR.FF.W.0003.000000T0000Z-140228T1530Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
SANTA CLARA CA-SANTA CRUZ CA-SAN MATEO CA-
728 AM PST FRI FEB 28 2014
...THE FLASH FLOOD WARNING WILL EXPIRE AT 730 AM PST FOR SAN MATEO...
SANTA CRUZ AND SANTA CLARA COUNTIES...
LAT...LON 3755 12226 3752 12217 3751 12216 3751 12213
3750 12212 3749 12212 3748 12211 3748 12208
3746 12205 3719 12210 3721 12231
$$
MMThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 28, 4:28 AM PST | Areal Flood Advisory | MTR | Alameda, Contra Costa, Monterey, San Benito, City and County of San Francisco, San Mateo and 2 more | 4 hr |
| Feb 28, 8:23 AM PST | Special Marine Warning | MTR | 37 min | |
| Feb 28, 9:03 AM PST | Areal Flood Advisory | MTR | Monterey, San Benito, Santa Cruz | 87 min |
| Feb 28, 10:47 AM PST | Special Marine Warning | MTR | 43 min |
Nearby
Flash Flood Warnings in California, 2014Every flash flood warning in 2014
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.