Alert archive / Texas / Flash Flood Warnings in 1997

Flash Flood Warning 20, NWS Austin/San Antonio, TX

April 4, 1997DeWitt County, Lavaca County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Apr 4, 1997, 1:17 AM CST for DeWitt County, Lavaca County, Texas. It was in force for 3 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
Apr 4, 1997, 1:17 AM CST (07:17 UTC)
Expired
Apr 4, 1997, 4:15 AM CST
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties DeWitt County, TX, Lavaca County, TX

The radar

The Austin/San Antonio radar (KEWX), 100 km from the middle of the area, began a volume at 07:18 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

Corpus Christi, TX (KCRP), launched 00:00Z, 7.3 hours before the alert went out and 168 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 00:00Z on 1997-04-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1324 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 00:00Z on 1997-04-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.19395878Sfc1 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
1324 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
503 m above ground
0-6 km bulk shear
62 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
111 m²/s²
Significant tornado parameter
0.9
Supercell composite
3.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 040719
FFWSAT
TXC123-285-041015-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
117 AM CST FRI APR 4 1997
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  415 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL TEXAS
 
   ...DE WITT COUNTY...LAVACA COUNTY
 
DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY RAINS OVER
DE WITT AND LAVACA COUNTIES MOVING NORTH AND NORTHEAST AT 20 MPH.
RAINFALL RATES OF 2 INCHES PER HOUR ARE BEING ESTIMATED.
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS OBSERVED
ACT QUICKLY.  MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
 
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT ATTEMPT TO
CROSS BRIDGES...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 DURING THREATENING RAINS.

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 3, 8:33 PM CSTFlash Flood WarningEWXDimmit42 min
Apr 3, 8:33 PM CSTSevere Thunderstorm WarningEWXDimmit42 min
Apr 3, 9:18 PM CSTSevere Thunderstorm WarningEWXMedina, Zavala57 min
Apr 3, 10:36 PM CSTFlash Flood WarningEWXGillespie69 min
Apr 3, 10:47 PM CSTFlash Flood WarningEWXKerr58 min
Apr 3, 11:10 PM CSTSevere Thunderstorm WarningEWXBexar65 min
Apr 3, 11:32 PM CSTSevere Thunderstorm WarningEWXComal58 min
Apr 3, 11:55 PM CSTSevere Thunderstorm WarningEWXHays65 min
Apr 4, 12:25 AM CSTFlash Flood WarningEWXWilliamson65 min
Apr 4, 12:25 AM CSTSevere Thunderstorm WarningEWXWilliamson65 min
Apr 4, 12:43 AM CSTSevere Thunderstorm WarningEWXHays62 min
Apr 4, 1:34 AM CSTFlash Flood WarningEWXTravis, Williamson116 min
Apr 4, 5:36 AM CSTFlash Flood WarningEWXLavaca3 hr
Apr 4, 6:23 AM CSTFlash Flood WarningEWXTravis, Williamson3 hr
Apr 4, 6:31 AM CSTFlash Flood WarningEWXBlanco3 hr
Apr 4, 6:43 AM CSTFlash Flood WarningEWXKendall3 hr
Apr 4, 9:24 AM CSTFlash Flood WarningEWXTravis, Williamson3 hr
Apr 4, 10:12 AM CSTFlash Flood WarningEWXDeWitt2 hr
Apr 4, 11:30 AM CSTSevere Thunderstorm WarningEWXVal Verde60 min
Apr 4, 2:34 PM CSTSevere Thunderstorm WarningEWXUvalde56 min
Apr 4, 2:40 PM CSTSevere Thunderstorm WarningEWXReal65 min
Apr 4, 3:00 PM CSTFlash Flood WarningEWXReal2 hr
Apr 4, 3:25 PM CSTFlash Flood WarningEWXBandera65 min
Apr 4, 3:25 PM CSTSevere Thunderstorm WarningEWXBandera65 min
Apr 4, 3:32 PM CSTFlash Flood WarningEWXUvalde58 min
Apr 4, 3:32 PM CSTSevere Thunderstorm WarningEWXUvalde58 min
Apr 4, 3:53 PM CSTFlash Flood WarningEWXKerr2 hr
Apr 4, 4:24 PM CSTFlash Flood WarningEWXBandera2 hr
Apr 4, 4:34 PM CSTSevere Thunderstorm WarningEWXMedina56 min
Apr 4, 5:11 PM CSTSevere Thunderstorm WarningEWXBexar, Kendall79 min

Nearby

Flash Flood Warnings in Texas, 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.