Alert archive / California / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 2, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Feb 7, 1998, 5:53 PM PST for Santa Clara County, Santa Cruz County, California. It was in force for 37 min. 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, 5:53 PM PST (01:53 UTC)
- Expired
- Feb 7, 1998, 6:30 PM PST
- In force
- 37 min
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
Counties Santa Clara County, CA, Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 5 km from the middle of the area, began a volume at 01:53 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 00:00Z, 1.9 hours before the alert went out and 74 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
- 502 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 650 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 137 m²/s²
- 0-3 km storm-relative helicity
- 167 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.7
The text
As transmitted, in the capitals the NWS used until 2016.
922 WUUS1 KSFO 080159 RRA SVRSFO CAC085-087-080230- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 553 PM PST SAT FEB 7 1998 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 630 PM PST FOR PEOPLE IN THE FOLLOWING LOCATIONSS... IN CENTRAL CALIFORNIA ...SOUTHWESTERN SANTA CLARA COUNTY ...EASTERN SANTA CRUZ COUNTY DOPPLER WEATHER RADAR INDICATES A SEVERE THUNDERSTORM OVER WATSONVILLE A655 PM. THIS STORM IS MOVING NORTHEAST AT 30 MPH AND WILL MOVE INTO SOUTHWEST SANTA CLARA COUNTY NEAR THE TOWN OF GILROY AT 605 PM. THIS SEVERE STORM WILL BRING STRONG GUSTY WINDS...LARGE HAIL...AND LOCAL HEAVY RAIN. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DONT DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. DIAZ
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, 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, 6:55 AM PST | Flash Flood Warning | MTR | Santa Clara | 8 hr |
| Feb 8, 1:55 PM PST | Flash Flood Warning | MTR | Santa Clara | 4 hr |
Nearby
Severe Thunderstorm Warnings in California, 1998Every severe thunderstorm 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.