Alert archive / Texas / Flash Flood Warnings in 2001

Flash Flood Warning 57, NWS Austin/San Antonio, TX

August 31, 20019 counties in Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 31, 2001, 10:45 PM CDT for 9 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 31, 2001, 10:45 PM CDT (03:45 UTC)
Expired: Sep 1, 2001, 2:00 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

Counties Atascosa County, TX, Bastrop County, TX, Bexar County, TX, Caldwell County, TX, Comal County, TX, Guadalupe County, TX, Hays County, TX, Travis County, TX, Wilson County, TX

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 3.8 hours before the alert went out and 203 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 2099 J/kg
Mixed-layer CIN: -11 J/kg
Mixed-layer LCL: 567 m above ground
0-6 km bulk shear: 27 kt
0-1 km storm-relative helicity: 78 m²/s²
0-3 km storm-relative helicity: 125 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.4

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 010342
FFWSAT
TXC013-021-029-055-091-187-209-453-493-010700-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1045 PM CDT FRI AUG 31 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES IN TEXAS...
  COMAL
  WILSON
  BASTROP
  TRAVIS
  BEXAR
  HAYS
  ATASCOSA
  GUADALUPE
  CALDWELL

* UNTIL 200 AM CDT

* AT 1040 PM...WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF 
VERY HEAVY RAINS EXTENDING FROM JUST EAST OF NEW BRAUNFELS SOUTHWEST 
TO NEAR NATALIA...MOVING SOUTHEAST AT 15 MPH.  IN ADDITION...LIGHT
TO MODERATE RAINS EXTENDED NORTHWARD TO ENCOMPASS THE ESCARPMENT 
COUNTIES FROM TRAVIS SOUTHWEST THROUGH HAYS AND COMAL COUNTIES TO 
BEXAR COUNTY.  MUCH OF SOUTH CENTRAL TEXAS INCLUDING THESE 
ESCARPMENT COUNTIES ARE TOTALLY SATURATED...ANY FURTHER RAINFALL CAN 
BE EXPECTED TO  CAUSE RAPID RUNOFF AND RESULTANT FLASH FLOODING.   

RAINS FROM THESE ESCARPMENT COUNTIES MAY LESSEN OR END IN THE NEXT 
HOUR OR SO...HOWEVER RUNOFF FROM THESE STORMS WILL CONTINUE WELL 
BEYOND MIDNIGHT.  

RESIDENTS ACROSS THESE WARNED COUNTIES ARE URGED NOT TO VENTURE OUT 
TONIGHT. MOTORISTS ARE WARNED TO AVOID LOW WATER CROSSINGS AND RURAL
ROADS WHICH APPEAR FLOODED.    

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.

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.

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 2877 9879 2865 9865 3012 9712 3053 9798

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 31, 7:02 PM CDT	Flash Flood Warning	EWX	Kerr	118 min
Aug 31, 7:40 PM CDT	Flash Flood Warning	EWX	Blanco, Kendall	2 hr
Aug 31, 7:45 PM CDT	Flash Flood Warning	EWX	Bexar, Comal, Hays, Travis	3 hr
Aug 31, 8:00 PM CDT	Flash Flood Warning	EWX	Bandera	2 hr
Aug 31, 9:02 PM CDT	Flash Flood Warning	EWX	Kerr	118 min
Aug 31, 10:05 PM CDT	Flash Flood Warning	EWX	Blanco, Kendall	85 min
Aug 31, 11:57 PM CDT	Flash Flood Warning	EWX	Gonzales, Karnes	4 hr

Nearby

Flash Flood Warnings in Texas, 2001 Every 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.