Alert archive / California / Flash Flood Warnings in 1997

Flash Flood Warning 19, NWS San Francisco Bay Area, CA

January 1, 1997Santa Clara County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 1, 1997, 5:03 PM PST for Santa Clara County, California. It was in force for 117 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
Jan 1, 1997, 5:03 PM PST (01:03 UTC)
Expired
Jan 1, 1997, 7:00 PM PST
In force
117 min
Issued by
NWS San Francisco Bay Area, CA
Area
Whole counties

County Santa Clara County, CA

The radar

The San Francisco radar (KMUX), 20 km from the middle of the area, began a volume at 01:04 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 nearest sounding before it

Oakland, CA (KOAK), launched 00:00Z, 1.1 hours before the alert went out and 71 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.

Skew-T log-pSkew-T log-p diagram, Oakland, CA at 00:00Z on 1997-01-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 00:00Z on 1997-01-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 216 square meters per square second.1939587897Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
533 m above ground
0-6 km bulk shear
77 kt
0-1 km storm-relative helicity
216 m²/s²
0-3 km storm-relative helicity
322 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KSFO 020107
FFWSFO
CAC085-020300-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
503 PM PST WED JAN 1 1997
 
THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  700 PM PST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN CENTRAL CALIFORNIA
 
   ...WESTERN SANTA CLARA COUNTY
 
RADAR AND REMOTE PRECIPITATION GAGES CONTINUE TO INDICATE VERY HEAVY
RAIN OVER SOUTHWESTERN SAN MATEO...SANTA CRUZ AND WESTERN SANTA CLARA
COUNTIES. HEAVY RAINFALL SHOULD CONTINUE OVER THE WARNING AREA OVER THE
NEXT FEW HOURS. WESTERN SANTA CLARA SHOULD SEE SMALL CREEKS COME OUT OF
THEIR BANKS...ALONG WITH URBAN FLOODING.
 
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.

IssuedProductOfficeCountiesLasted
Jan 1, 7:00 PM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz4 hr
Jan 1, 7:22 PM PSTFlash Flood WarningMTRSan Luis Obispo6 hr
Jan 1, 10:59 PM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz3 hr
Jan 2, 5:52 AM PSTFlash Flood WarningMTRSan Mateo, Santa Clara, Santa Cruz3 hr
Jan 2, 5:52 AM PSTFlash Flood WarningMTRAlameda, Contra Costa3 hr
Jan 2, 11:45 AM PSTFlash Flood WarningMTRAlameda, San Mateo, Santa Clara, Santa Cruz4 hr
Jan 2, 11:45 AM PSTFlash Flood WarningMTRMonterey4 hr
Jan 2, 11:45 AM PSTFlash Flood WarningMTRContra Costa4 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.