Alert archive / California / Flash Flood Warnings in 1997
Flash Flood Warning 34, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 22, 1997, 2:15 PM PST for Contra Costa County, California. It was in force for 4 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
- Jan 22, 1997, 2:15 PM PST (22:15 UTC)
- Expired
- Jan 22, 1997, 6:00 PM PST
- In force
- 4 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
County Contra Costa County, CA
The radar
The Sacramento radar (KDAX), 69 km from the middle of the area, began a volume at 22:15 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, 10.3 hours before the alert went out and 31 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
- 542 m above ground
- 0-6 km bulk shear
- 42 kt
- 0-1 km storm-relative helicity
- 131 m²/s²
- 0-3 km storm-relative helicity
- 285 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 222216
FFWSFO
CAC097-055-041-013-075-230200-
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
215 PM PST WED JAN 22 1997
THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A FLASH
FLOOD WARNING UNTIL 6PM FOR THE FOLLOWING LOCATIONS OF THE NORTHERN
SAN FRANCISCO BAY AREA...
IN CENTRAL CALIFORNIA
...SONOMA...NAPA...MARIN...SAN FRANCISCO AND CONTRA COSTA
COUNTIES...
AT 200 PM RADAR...SATELLITE...AND SPOTTER REPORTS ARE INDICATING VERY
HEAVY RAINFALL MOVING THROUGH THE NORTHERN SAN FRANCISCO BAY AREA.
STRONG CELLS...SOME WITH POSSIBLE THUNDERSTORMS... ARE CURRENTLY ON A
LINE FROM ABOUT SAN FRANCISCO TO NAPA. RAINFALL RATES IN THE NORTH
BAY HAVE EXCEEDED .5 INCHES IN THE PAST HOUR. THESE STORMS WILL MOVE
SOUTH AND EAST AND WEAKEN LATE THIS AFTERNOON.
THESE STORMS WILL CAUSE FLOODING OF STREAMS...CREEKS AND URBAN AREAS
AS WELL AS MUDSLIDES. PERSONS IN THE REGION SHOULD WATCH FOR RAPIDLY
RISING WATER AND SLIPPAGE OF UNSTABLE HILLSIDES.
A FLASH FLOOD WARNING MEANS THAT FLOODING OCCURRING OR IS IMMINENT.
ITS IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS... RIVERS...
OR CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS. MUDSLIDES ARE ALSO
POSSIBLE.
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.
JAN NULL
LEAD FORECASTERThe office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 22, 2:15 PM PST | Flash Flood Warning | MTR | Napa, Sonoma | 4 hr |
| Jan 22, 2:15 PM PST | Flash Flood Warning | MTR | Marin | 4 hr |
| Jan 22, 2:15 PM PST | Flash Flood Warning | MTR | City and County of San Francisco | 4 hr |
Nearby
Flash Flood Warnings in California, 1997Every flash flood warning in 1997
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.