Alert archive / California / Flash Flood Warnings in 1998
Flash Flood Warning 37, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 6, 1998, 9:15 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, 9:15 PM PST (05:15 UTC)
- Expired
- Feb 7, 1998, 12:00 AM 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 05:16 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, 5.3 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
- 35 J/kg
- Mixed-layer CIN
- -10 J/kg
- Mixed-layer LCL
- 666 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 163 m²/s²
- 0-3 km storm-relative helicity
- 170 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSFO 070518 FFWSFO CAC081-097-070800- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 915 PM PST FRI FEB 6 1998 ...THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS EXTENDED THE FLASH FLOOD WARNING FOR SOUTHERN SAN MATEO AND SOUTHERN SONOMA COUNTIES UNTIL MIDNIGHT TONIGHT... THE FLASH FLOOD WARNING FOR SOUTHERN SONOMA AND SOUTHERN SAN MATEO IS EXTENDED UNTIL MIDNIGHT TONIGHT. THE PESCADERO CREEK IS STILL FLOWING ABOVE FLOOD STAGE AND SAN MATEO COUNTY OFFICIALS REPORT FLOODING CONTINUES IN THE TOWN OF PESCADERO. ALSO...THE PETALUMA RIVER IN SOUTHERN SONOMA COUNTY REMAINS ABOVE FLOOD STAGE. ONLY A FEW LIGHT SHOWERS CONTINUE OVER THE WARNING AREA SO NO FURTHER RISES ARE EXPECTED ON AREA CREEKS AND RIVERS. HOWEVER...RUNOFF FROM HEAVIER RAINS EARLIER THIS EVENING CONTINUE AND THE PESCADERO CREEK AND PETALUMA RIVER WILL BE SLOW TO SUBSIDE WITH FLOODING ALONG THEIR BANKS LIKELY TO CONTINUE FOR THE NEXT FEW HOURS. 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. DYKEMA
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 | 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, 12:24 PM PST | Flash Flood Warning | MTR | Monterey, San Benito | 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.