Alert archive / Texas / Flash Flood Warnings in 2003

Flash Flood Warning 70, NWS Austin/San Antonio, TX

August 25, 2003Gillespie County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 25, 2003, 5:04 PM CDT for Gillespie County, Texas. It was in force for 116 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 25, 2003, 5:04 PM CDT (22:04 UTC)
Expired: Aug 25, 2003, 7:00 PM CDT
In force: 116 min
Issued by: NWS Austin/San Antonio, TX
Area: Counties, with a storm outline in the text

County Gillespie County, TX

The radar

The Austin/San Antonio radar (KEWX), 116 km from the middle of the area, began a volume at 22:04 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

Del Rio, TX (KDRT), launched 12:00Z, 10.1 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-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: 2069 J/kg
Mixed-layer CIN: -42 J/kg
Mixed-layer LCL: 704 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 40 m²/s²
0-3 km storm-relative helicity: 38 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 252205
FFWSAT
TXC171-260000-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
504 PM CDT MON AUG 25 2003

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  GILLESPIE

* UNTIL 700 PM CDT

* AT 504 PM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  6 MILES NORTHWEST OF FREDERICKSBURG...MOVING NORTHWEST AT 15 MPH   
  WITH ADDITIONAL DEVELOPMENT ACROSS THE SOUTHERN HALF OF GILLESPIE.

EXCESSIVE RUNOFF FROM THESE STORMS WILL CAUSE FLASH FLOODING OF 
CREEKS AND STREAMS...ROADS AND ROADSIDE CULVERTS. 

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 3015 9905 3015 9860 3050 9859 3050 9895
          3063 9915 3044 9938

$$

2 follow-up statements

000 
WGUS74 KEWX 252321
FFSSAT
TXC171-260000-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
615 PM CDT MON AUG 25 2003

...A FLASH FLOOD WARNING CONTINUES FOR GILLESPIE COUNTY UNTIL 700 PM
CDT...

SHOWERS AND STRONG THUNDERSTORMS WITH HEAVY RAIN WERE WEAKENING OVER 
GILLESPIE COUNTY OVER THE PAST HOUR...HOWEVER ADDITIONAL RAINFALL 
AMOUNTS OF ONE HALF INCH TO ONE INCH ARE POSSIBLE.  VERY HEAVY RAINS 
IN THE PAST FEW HOURS WILL CONTINUE TO RUNOFF CONTINUING ANY 
FLOODING PROBLEMS.  

NUMEROUS LOW WATER CROSSING WERE REPORTED FLOODED IN GILLESPIE 
COUNTY AND WATER WAS JUST UNDER THE BRIDGE AT HIGHWAY 16 AT THE 
PEDERNALES RIVER. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER 
COVERS THE ROAD. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED 
QUICKLY. MOVE TO HIGHER GROUND. 

$$

000 
WGUS74 KEWX 252357
FFSSAT
TXC171-260030-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
700 PM CDT MON AUG 25 2003

...THE FLASH FLOOD WARNING FOR GILLESPIE COUNTY HAS EXPIRED...

NATIONAL WEATHER SERVICE RADAR INDICATED THE RAINFALL WAS ENDING AND 
THE FLOOD THREAT OF ADDITIONAL FLOODING WAS DIMINISHING FOR 
GILLESPIE COUNTY. SOME MINOR FLOODING MAY CONTINUE...BUT THE THREAT 
OF SERIOUS FLOODING HAS ENDED. 

DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE WATER COVERS THE ROAD.
VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO 
HIGHER GROUND. 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 25, 4:48 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie	42 min

Nearby

Flash Flood Warnings in Texas, 2003 Every flash flood warning in 2003

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.