Alert archive / California / Flash Flood Warnings in 1998
Flash Flood Warning 59, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 8, 1998, 6:55 AM PST for Santa Clara 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 8, 1998, 6:55 AM PST (14:55 UTC)
- Expired
- Feb 8, 1998, 3:00 PM PST
- In force
- 8 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
County Santa Clara County, CA
The radar
The San Francisco radar (KMUX), 20 km from the middle of the area, began a volume at 14:55 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, 2.9 hours before the alert went out and 71 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
- 189 J/kg
- Mixed-layer CIN
- -5 J/kg
- Mixed-layer LCL
- 722 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 74 m²/s²
- 0-3 km storm-relative helicity
- 156 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.2
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSFO 081457 FFWSFO CAC085-082300- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 655 AM PST SUN FEB 8 1998 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 300 PM PST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN CENTRAL CALIFORNIA ...NORTH CENTRAL SANTA CLARA COUNTY ...A FLASH FLOOD WARNING HAS BEEN ISSUED BY THE NATIONAL WEATHER SERVICE FOR NORTH CENTRAL SANTA CLARA COUNTY THROUGH TODAY... ANDERSON RESERVOIR CONTINUES TO SPILL THIS MORNING. AT 645 AM...ANDERSON WAS ABOUT THREE FEET ABOVE THE SPILLWAY. COYOTE CREEK IS RISING FAST THIS MORNING...AND WILL CONTINUE TO RISE THROUGHOUT THE DAY. SATELLITE AND WSR88D RADAR INDICATES MORE MODERATE TO LOCALLY HEAVY RAIN IS APPROACHING THE CENTRAL COAST. 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. COX
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 7, 5:53 PM PST | Severe Thunderstorm Warning | MTR | Santa Clara, Santa Cruz | 37 min |
| Feb 7, 8:00 PM PST | Flash Flood Warning | MTR | Napa, Sonoma | 3 hr |
| Feb 7, 8:00 PM PST | Flash Flood Warning | MTR | City and County of San Francisco, San Mateo | 3 hr |
| Feb 7, 8:00 PM PST | Flash Flood Warning | MTR | Monterey, San Benito, Santa Cruz | 3 hr |
| Feb 7, 8:00 PM PST | Flash Flood Warning | MTR | Alameda, Santa Clara | 3 hr |
| Feb 7, 8:00 PM PST | Flash Flood Warning | MTR | Contra Costa | 3 hr |
| Feb 7, 8:00 PM PST | Flash Flood Warning | MTR | Marin | 3 hr |
| Feb 7, 11:00 PM PST | Flash Flood Warning | MTR | Alameda, San Benito, San Mateo, Santa Clara, Santa Cruz | 3 hr |
| Feb 7, 11:00 PM PST | Flash Flood Warning | MTR | Napa, Sonoma | 3 hr |
| Feb 7, 11:00 PM PST | Flash Flood Warning | MTR | City and County of San Francisco | 3 hr |
| Feb 7, 11:00 PM PST | Flash Flood Warning | MTR | Marin | 3 hr |
| Feb 7, 11:00 PM PST | Flash Flood Warning | MTR | Monterey | 3 hr |
| Feb 7, 11:00 PM PST | Flash Flood Warning | MTR | Contra Costa | 3 hr |
| Feb 8, 1:55 PM PST | Flash Flood Warning | MTR | Santa Clara | 4 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.