Alert archive / California / Flash Flood Warnings in 1998
Flash Flood Warning 44, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 7, 1998, 12:24 PM PST for Monterey County, San Benito County, California. It was in force for 8 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
- Feb 7, 1998, 12:24 PM PST (20:24 UTC)
- Expired
- Feb 7, 1998, 8:30 PM PST
- In force
- 8 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
Counties Monterey County, CA, San Benito County, CA
The radar
The San Francisco radar (KMUX), 103 km from the middle of the area, began a volume at 20:27 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, 8.4 hours before the alert went out and 171 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
- 139 J/kg
- Mixed-layer CIN
- -4 J/kg
- Mixed-layer LCL
- 532 m above ground
- 0-6 km bulk shear
- 54 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 268 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSFO 072029 FFWSFO CAC053-069-080430- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 1224 PM PST SAT FEB 7 1998 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 830 PM PST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN CENTRAL CALIFORNIA ...MONTEREY COUNTY...SAN BENITO COUNTY HEAVY RAINFALL RANGING FROM ONE HALF TO ONE INCH AN HOUR ACROSS MUCH OF MONTEREY COUNTY WILL CONTINUE FOR THE NEXT SEVERAL HOURS THIS AFTERNOON. THE HEAVY RAINFALL WILL CONTINUE SPREADING TO THE EAST INTO SAN BENITO COUNTY ALSO THIS AFTERNOON. MORE HEAVY RAIN AND THUNDERSTORMS CONTINUE DEVELOPING OFF THE COAST AND MOVING THROUGH THE WARNED AREA. THE HEAVY RAIN IS EXPECTED TO DECREASE LATE THIS AFTERNOON. 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.
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 6, 9:15 PM PST | Flash Flood Warning | MTR | San Mateo | 3 hr |
| Feb 6, 9:15 PM PST | Flash Flood Warning | MTR | Sonoma | 3 hr |
| Feb 7, 8:30 AM PST | Flash Flood Warning | MTR | Amador | 6 hr |
| Feb 7, 8:30 AM PST | Flash Flood Warning | MTR | Riverside | 6 hr |
| Feb 7, 12:05 PM PST | Flash Flood Warning | MTR | Alameda, San Mateo, Santa Clara, Santa Cruz | 8 hr |
| Feb 7, 12:05 PM PST | Flash Flood Warning | MTR | Contra Costa | 8 hr |
| Feb 7, 12:05 PM PST | Flash Flood Warning | MTR | City and County of San Francisco | 8 hr |
| Feb 7, 1:25 PM PST | Flash Flood Warning | MTR | Napa, Sonoma | 7 hr |
| Feb 7, 1:25 PM PST | Flash Flood Warning | MTR | Marin | 7 hr |
Nearby
Flash Flood Warnings in California, 1998Every flash flood warning in 1998
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.