Alert archive / California / Flash Flood Warnings in 1998
Flash Flood Warning 33, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Feb 6, 1998, 9:38 AM PST for San Mateo County, Santa Clara County, California. It was in force for 5 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, 9:38 AM PST (17:38 UTC)
- Expired
- Feb 6, 1998, 2:45 PM PST
- In force
- 5 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
Counties San Mateo County, CA, Santa Clara County, CA
The radar
The San Francisco radar (KMUX), 23 km from the middle of the area, began a volume at 17:41 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, 5.6 hours before the alert went out and 47 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 061745 FFWSFO CAC081-085-062245- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 938 AM PST FRI FEB 6 1998 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL 245 PM PST FOR PEOPLE IN THE FOLLOWING LOCATIONSS... IN CENTRAL CALIFORNIA ...SOUTHERN SAN MATEO COUNTY ...NORTHWESTERN SANTA CLARA COUNTY RAINFALL AMOUNTS OF ONE TO TWO INCHES HAVE FALLEN OVER THE PAST FEW HOURS IN THE MOUNTAINS OF SAN MATEO COUNTY. SMALL RIVERS AND CREEKS ARE HIGH FROM THE STORM EARLIER THIS WEEK. THE RUNOFF AND THE COMBINATION OF SATURATED CONDITIONS IS CAUSING SHARP RISES ON THE SAN FRANCISQUITO CREEK AT PALO ALTO. BUTANO...PESCADERO AND SAN GEGORIO WILL ALSO RISE OUT OF THEIR BANKS THIS MORNING. 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.
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, 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 |
| Feb 6, 2:44 PM PST | Flash Flood Warning | MTR | San Mateo | 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.