Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 33, NWS Austin/San Antonio, TX

August 30, 2001Karnes County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 30, 2001, 7:32 AM CDT for Karnes 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 outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued
Aug 30, 2001, 7:32 AM CDT (12:32 UTC)
Expired
Aug 30, 2001, 10:30 AM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Karnes County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 12:00Z, 0.5 hours before the alert went out and 142 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 301232
FFWSAT
FFWSAT
TXC255-301530-

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

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  KARNES

* UNTIL 1030 AM CDT

* AT 730 AM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  FROM KENEDY TO HELENA AND FROM KARNES CITY TO COY...MOVING NORTH
  AT 10 MPH.  RAINFALL RATES OF AROUND 2 INCHES PER HOUR CAN BE 
  EXPECTED AND AROUND 3 INCHES HAS BEEN ESTIMATED TO ALREADY HAVE 
  FALLEN.

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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES...DIPS...OR OTHER 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 UP TO HIGHER GROUND.


LAT...LON 2873 9799 2882 9760 2900 9778 2912 9765
          2921 9773 2890 9816

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this flash flood warning went out at Aug 30, 7:00 AM CDT, 32 minutes earlier.

Area forecast discussion, Aug 30, 7:00 AM CDT, 32 minutes before
SOUTH CENTRAL TEXAS FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
700 AM CDT WED AUG 29 2001

UPDATE...BOOSTING POPS TODAY MOST GROUPS BASED ON CURRENT TRENDS.

TEMPS YESTERDAY MORE LIKE NOVEMBER THAN AUGUST  SHOULD BE MORE
MODERATE TODAY...WARMING SLOWLY NEXT FEW DAYS.  WILL REISSUE FLASH
FLOOD WATCH THROUGH THIS EVENING ALONG AND EAST OF I35...ALTHOUGH
MAIN POTENTIAL SHOULD BE EASTERN PORTIONS OF WATCH AREA.  ANOTHER
VORT MAX WILL BRING INCREASED ACTIVITY WEST TONIGHT.  GRADUAL
DECREASE FRIDAY AND FRIDAY NIGHT THEN CHANCE POPS AREA-WIDE SATURDAY
AS WEAK FRONT EDGES INTO REGION...CONTINUING THROUGH LABOR DAY.
WARMER AND DRY TOWARD MIDDLE OF NEXT WEEK.

PRELIMINARY NUMBERS...
AUS 86/72/89/73 6332
DRT 91/73/94/75 2430
SAT 88/73/90/73 6332

.EWX...FLASH FLOOD WATCH THROUGH THIS EVENING ALONG AND EAST OF
       INTERSTATE 35.

3/4/WR

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, 10:00 AM CDTFlash Flood WarningEWXBexar, Comal, Guadalupe, Wilson3 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.