Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 34, NWS Austin/San Antonio, TX

August 30, 20014 counties in Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 30, 2001, 10:00 AM CDT for 4 counties in 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 30, 2001, 10:00 AM CDT (15:00 UTC)
Expired
Aug 30, 2001, 1:00 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

Counties Bexar County, TX, Comal County, TX, Guadalupe County, TX, Wilson County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 3.0 hours before the alert went out and 211 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 2001-08-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 884 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 2001-08-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 65 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
884 J/kg
Mixed-layer CIN
-8 J/kg
Mixed-layer LCL
614 m above ground
0-6 km bulk shear
21 kt
0-1 km storm-relative helicity
65 m²/s²
0-3 km storm-relative helicity
230 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.7

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 301507
FFWSAT
TXC029-091-187-493-301800-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1000 AM CDT THU AUG 30 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  COMAL
  WILSON
  BEXAR
  GUADALUPE

* UNTIL 100 PM CDT

* AT 955 AM...WEATHER SERVICE DOPPLER RADAR INDICATED THUNDERSTORMS 
  WITH VERY HEAVY RAIN REDEVELOPING ACROSS BEXAR AND WILSON COUNTIES
  MOVING NORTHEAST AT 10 TO 15 MPH INTO COMAL AND WILSON COUNTIES. 
  RAINFALL RATES ARE ESTIMATED AT ONE TO TWO INCHES AN HOUR.

EXCESSIVE RUNOFF FROM THIS STORM WILL CAUSE FLASH FLOODING OF SMALL
CREEKS AND STREAMS...HIGHWAYS AND UNDERPASSES. ADDITIONALLY...COUNTRY
ROADS AND FARMLANDS ALONG THE BANKS OF CREEKS AND STREAMS AND OTHER
LOW LYING AREAS ARE SUBJECT TO FLASH 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.


LAT...LON 2928 9877 2926 9844 2895 9815 2965 9773
          2998 9833

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 12:00 AM CDTFlash Flood WarningEWXDeWitt, Lavaca2 hr
Aug 30, 7:32 AM CDTFlash Flood WarningEWXKarnes3 hr
Aug 30, 12:56 PM CDTFlash Flood WarningEWXBexar, Comal, Guadalupe, Wilson3 hr
Aug 30, 3:45 PM CDTFlash Flood WarningEWXBexar, Gonzales, Guadalupe, Wilson3 hr
Aug 30, 6:30 PM CDTFlash Flood WarningEWXAtascosa, Bexar, Gonzales, Guadalupe, Wilson4 hr

Nearby

Flash Flood Warnings in Texas, 2001Every flash flood warning in 2001

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.