Alert archive / Texas / Flash Flood Warnings in 1991

Flash Flood Warning 7, NWS Austin/San Antonio, TX

January 18, 1991Guadalupe County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jan 18, 1991, 6:06 AM CST for Guadalupe County, Texas. It was in force for 3 hr.

The area

The counties it named.

The facts

Issued
Jan 18, 1991, 6:06 AM CST (12:06 UTC)
Expired
Jan 18, 1991, 9:15 AM CST
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Guadalupe County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 0.1 hours before the alert went out and 214 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, Corpus Christi, TX at 12:00Z on 1991-01-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1104 joules per kilogram.LCLLFCEL10008507005003002001001 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, Corpus Christi, TX at 12:00Z on 1991-01-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 387 square meters per square second.1939587897117136Sfc1 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
1104 J/kg
Mixed-layer CIN
-17 J/kg
Mixed-layer LCL
601 m above ground
0-6 km bulk shear
64 kt
0-1 km storm-relative helicity
387 m²/s²
0-3 km storm-relative helicity
479 m²/s²
Significant tornado parameter
3.4
Supercell composite
12.8

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 181209
FFWSAT
TXC187-181515-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
606 AM CST FRI JAN 18 1991
 
THE NATIONAL WEATHER SERVICE IN SAN ANTONIO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  915 AM CST
FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH TEXAS
          ...GUADALUPE
 
THUNDERSTORMS PRODUCING HEAVY RAIN HAVE CAUSED FLOODING IN GUADALUPE
COUNTY. PEOPLE HAVE HAD TO BE EVACUATED FROM THEIR HOMES IN SEGUIN.
FARM TO MARKET ROAD 725 IS CLOSED FROM INTERSTATE 10 TO FM 78.
FM 78 IS CLOSED FROM MARION TO FM 744.  PORTIONS OF FM 1044 AND FM 20
ARE ALSO CLOSED DUE TO FLOODING.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR HAS BEEN
REPORTED.
 
YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR
SEVERE WEATHER REPORTS TO THE LOCAL NATIONAL WEATHER SERVICE OFFICE.
 
PLEASE LISTEN TO YOUR LOCAL RADIO...TV OR NOAA WEATHER RADIO STATION
FOR LATER STATEMENTS OR WARNINGS REGARDING THIS SEVERE WEATHER EVENT.

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jan 18, 3:02 AM CSTFlash Flood WarningEWXBexar118 min
Jan 18, 5:05 AM CSTFlash Flood WarningEWXBexar115 min

Nearby

Flash Flood Warnings in Texas, 1991Every flash flood warning in 1991

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.