Alert archive / California / Flash Flood Warnings in 1997
Flash Flood Warning 23, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 2, 1997, 5:52 AM PST for San Mateo County, Santa Clara County, Santa Cruz County, California. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jan 2, 1997, 5:52 AM PST (13:52 UTC)
- Expired
- Jan 2, 1997, 9:00 AM PST
- In force
- 3 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
Counties San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 14 km from the middle of the area, began a volume at 13:55 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, 1.9 hours before the alert went out and 58 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
- 2 J/kg
- Mixed-layer CIN
- -23 J/kg
- Mixed-layer LCL
- 474 m above ground
- 0-6 km bulk shear
- 79 kt
- 0-1 km storm-relative helicity
- 148 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSFO 021355 FFWSFO CAC001-013-081-085-087-021700- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 552 AM PST THU JAN 2 1997 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 900 AM PST FOR PEOPLE IN THE FOLLOWING LOCATIONSS... IN CENTRAL CALIFORNIA ...ALAMEDA COUNTY...CONTRA COSTA COUNTY...SAN MATEO COUNTY ...SANTA CLARA COUNTY...SANTA CRUZ COUNTY RADAR AND PAST HOUR RAINFALL RATES INDICATE THAT ANOTHER BAND OF MODERATE TO HEAVY RAIN IS MAKING ITS WAY OVER THE PENNINSULA...EAST BAY...SANTA CRUZ AND SANTA CLARA COUNTIES WITH RAINFALL RATES OF A THIRD TO ONE HALF AND INCH AN HOUR. URBAN FLOODING CAN BE EXPECTED OVER THE NEXT THREE HOURS AND MUDSLIDES ARE ALSO POSSIBLE. THE SMALLER RIVERS AND STREAMS IN THE WARNING AREA WILL CONTINUE TO RISE OVER THE NEXT THREE HOURS. 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. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS BRIDGES...DIPS...OR LOW SPOTS IF WATER COVERS THE ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND. DIAZ/COX
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 5:03 PM PST | Flash Flood Warning | MTR | Santa Clara | 117 min |
| Jan 1, 7:00 PM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara, Santa Cruz | 4 hr |
| Jan 1, 7:22 PM PST | Flash Flood Warning | MTR | San Luis Obispo | 6 hr |
| Jan 1, 10:59 PM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara, Santa Cruz | 3 hr |
| Jan 2, 5:52 AM PST | Flash Flood Warning | MTR | Alameda, Contra Costa | 3 hr |
| Jan 2, 11:45 AM PST | Flash Flood Warning | MTR | Alameda, San Mateo, Santa Clara, Santa Cruz | 4 hr |
| Jan 2, 11:45 AM PST | Flash Flood Warning | MTR | Monterey | 4 hr |
| Jan 2, 11:45 AM PST | Flash Flood Warning | MTR | Contra Costa | 4 hr |
Nearby
Flash Flood Warnings in California, 1997Every flash flood warning in 1997
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.