Alert archive / California / Flash Flood Warnings in 1998
Flash Flood Warning 36, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 6, 1998, 2:44 PM PST for San Mateo 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
- Feb 6, 1998, 2:44 PM PST (22:44 UTC)
- Expired
- Feb 6, 1998, 6:00 PM PST
- In force
- 3 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
County San Mateo County, CA
The radar
The San Francisco radar (KMUX), 51 km from the middle of the area, began a volume at 22:45 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, 10.7 hours before the alert went out and 35 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.
000 TTAA00 KSFO 062249 FFWSFO CAC081-097-070200- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 244 PM PST FRI FEB 6 1998 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 600 PM PST FOR PEOPLE IN THE FOLLOWING LOCATIONSS... IN CENTRAL CALIFORNIA ...SOUTHERN SAN MATEO COUNTY IN NORTH CENTRAL CALIFORNIA ...SOUTHERN SONOMA COUNTY THE FLASH FLOOD WARNING FOR SOUTHERN SONOMA AND SOUTHERN SAN MATEO IS EXTENDED UNTIL 6PM. THE PESCADERO AND BUTANO CREEKS IN SOUTHERN SAN MATEO COUNTY ALONG WITH THE PETALUMA RIVER IN SOUTHERN SONOMA COUNTY REMAIN WELL OUT OF THEIR BANKS. SHOWERS AND THUNDERSTORMS WILL CONTINUE OVER THE WARNING AREA THROUGH THIS EVENING WHICH WILL PREVENT THESE CREE AND RIVERS FROM RECEDEING. 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. 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 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, 2:02 PM PST | Severe Thunderstorm Warning | MTR | Santa Clara, Santa Cruz | 58 min |
| Feb 6, 2:44 PM PST | Flash Flood Warning | MTR | Sonoma | 3 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.