Alert archive / California / Flash Flood Warnings in 1990

Flash Flood Warning 4, NWS San Diego, CA

July 14, 1990Imperial County, California

NWS San Diego, CA issued this flash flood warning at Jul 14, 1990, 7:17 PM PDT for Imperial County, California. It was in force for 58 min.

The area

The counties it named.

The facts

Issued
Jul 14, 1990, 7:17 PM PDT (02:17 UTC)
Expired
Jul 14, 1990, 8:15 PM PDT
In force
58 min
Issued by
NWS San Diego, CA
Area
Whole counties

County Imperial County, CA

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

San Diego, CA (KNKX), launched 00:00Z, 2.3 hours before the alert went out and 173 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, San Diego, CA at 00:00Z on 1990-07-15Temperature 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°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, San Diego, CA at 00:00Z on 1990-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 44 square meters per square second.1939Sfc1 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
NaN m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
44 m²/s²
0-3 km storm-relative helicity
61 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 KSAN 150223 RRA
FFWSAN
CAC025-150315-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
717 PM PDT SAT JUL 14 1990
 
THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  815 PM PDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHEAST CALIFORNIA
 
   ...NORTHEASTERN IMPERIAL COUNTY
 
ALONG HIGHWAY 78 BETWEEN PALO VERDE AND MIDWAY WELL SOUTHWEST OF
BLYTHE CALIFORNIA.
 
AT 7:15 PM PDT RADAR INDICATED HEAVY THUNDERSTORMS IN NORTHEASTERN
IMPERIAL COUNTY.  FLASH FLOODING OF NORMALLY DRY RIVERS...CREEKS...
AND ARROYOS WILL OCCUR. IF YOU ARE DRIVING IN THE GET TO HIGHER GROUND
IMMEDIATELY.
 
IF YOU SEE WATER PASSING OVER THE HIGHWAY DO NOT ATTEMPT TO CROSS IT.
IT MAY SUDDENLY SWEEP YOU AWAY.

The office that day

Everything else NWS San Diego, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 14, 5:08 PM PDTFlash Flood WarningSGXImperial67 min

Nearby

Flash Flood Warnings in California, 1990Every flash flood warning in 1990

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.