Alert archive / California / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 1, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this severe thunderstorm warning at Feb 6, 1998, 2:02 PM PST for Santa Clara County, Santa Cruz County, California. It was in force for 58 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 6, 1998, 2:02 PM PST (22:02 UTC)
- Expired
- Feb 6, 1998, 3:00 PM PST
- In force
- 58 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 22:04 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Feb 6, 11:45 AM PST | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 10.0 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1526 m above ground
- 0-6 km bulk shear
- 67 kt
- 0-1 km storm-relative helicity
- 210 m²/s²
- 0-3 km storm-relative helicity
- 448 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
211 WUUS1 KSFO 062209 RRA SVRSFO CAC085-087-062300- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 202 PM PST FRI FEB 6 1998 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 300 PM PST FOR PEOPLE IN THE FOLLOWING LOCATIONSS... IN CENTRAL CALIFORNIA ...SOUTHWESTERN SANTA CLARA COUNTY ...EASTERN SANTA CRUZ COUNTY WSR88D AND SPOTTERS REPORT A SEVERE THUNDERSTORM WITH DIME SIZE HAIL OVER SANTA CRUZ AT 2PM. THIS STORM CELL IS MOVING NOTHEAST AT 30 MILES PER HOUR. THIS STORM WILL MOVE INTO SANTA CLARA COUNTY JUST NORTH OF MORGAN HILL BY 230PM. HEAVY RAIN...STRONG GUSTY WINDS AND LARGE HAIL WILL ACCOMPANY THIS STORM. TAKE COVER. 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. COX/CARROLL/CANEPA
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 5, 4:00 PM PST | Flash Flood Warning | MTR | Napa, Sonoma | 8 hr |
| Feb 5, 4:00 PM PST | Flash Flood Warning | MTR | Marin | 8 hr |
| Feb 6, 8:42 AM PST | Flash Flood Warning | MTR | Monterey | 6 hr |
| Feb 6, 9:38 AM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara | 5 hr |
| Feb 6, 11:45 AM PST | Flash Flood Warning | MTR | Marin, Sonoma | 3 hr |
| Feb 6, 2:44 PM PST | Flash Flood Warning | MTR | Sonoma | 3 hr |
| Feb 6, 2:44 PM PST | Flash Flood Warning | MTR | San Mateo | 3 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.