Alert archive / California / Flash Flood Warnings in 1993

Flash Flood Warning 4, NWS San Francisco Bay Area, CA

January 13, 1993Alameda County, California

NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 13, 1993, 9:18 AM PST for Alameda County, California. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jan 13, 1993, 9:18 AM PST (17:18 UTC)
Expired
Jan 13, 1993, 12:15 PM PST
In force
3 hr
Issued by
NWS San Francisco Bay Area, CA
Area
Whole counties

County Alameda County, CA

The nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 5.3 hours before the alert went out and 26 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 12:00Z on 1993-01-13Temperature 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 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Oakland, CA at 12:00Z on 1993-01-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 square meters per square second.193958Sfc1 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
604 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
181 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 131725
FFWSFO
CAC001-132015-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN FRANCISCO CA
918 AM PST WED JAN 13 1993
 
THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 12 NOON PST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN CENTRAL CALIFORNIA
 
   ...SOUTHERN ALAMEDA COUNTY
 
ALAMEDA CREEK WAS STILL RISING IN NILES CANYON AT 8:45 AM..WHEN IT WAS
AT 11.2 FT..UNOFFICIAL FLOOD STAGE AT NILES IS 11.5 FT. SLIDES WERE ALSO
REPORTED TO BE OCCURRING IN NILES CANYON.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT. MOST
FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT ATTEMPT TO CROSS
BRIDGES..DIPS.. OR> LOW SPOTS IF WATER COVERS THE ROADWAY.  NEVER TRY TO
CROSS A FLOWING STREAM..EVEN A SMALL ONE..ON FOOT.  TO ESCAPE RISING
WATER MOVE TO HIGHER GROUND.
 
IN ADDITION..BE ALERT FOR THE POSSIBILITYOF MUDSLIDES IN THE AREA.
 
BARBATO

The office that day

Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 13, 4:10 AM PSTFlash Flood WarningMTRMarin5 hr
Jan 13, 6:10 AM PSTFlash Flood WarningMTRSanta Clara, Santa Cruz3 hr
Jan 13, 6:10 AM PSTFlash Flood WarningMTRAlameda, Contra Costa3 hr

Nearby

Flash Flood Warnings in California, 1993Every flash flood warning in 1993

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.