Alert archive / Texas / Flash Flood Warnings in 2004

Flash Flood Warning 92, NWS Austin/San Antonio, TX

May 13, 2004Llano County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at May 13, 2004, 6:57 PM CDT for Llano County, Texas. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
May 13, 2004, 6:57 PM CDT (23:57 UTC)
Expired
May 13, 2004, 9:00 PM CDT
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

County Llano County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 12.0 hours before the alert went out and 246 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, Del Rio, TX at 12:00Z on 2004-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3925 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, Del Rio, TX at 12:00Z on 2004-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 88 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
3925 J/kg
Mixed-layer CIN
-42 J/kg
Mixed-layer LCL
585 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
88 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
1.3
Supercell composite
7.0

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 132358
FFWSAT
TXC299-140200-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
657 PM CDT THU MAY 13 2004

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL 900 PM CDT

* AT 657 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED   
  FLASH FLOODING WILL BE POSSIBLE FROM A THUNDERSTORM 6 MILES WEST   
  OF CASTELL...OR ABOUT 16 MILES WEST OF LLANO...MOVING EAST AT 20   
  MPH.

* THE STORM PRODUCING FLASH FLOODING WILL BE OVER THE MAINLY THE 
  WESTERN THIRD OF LLANO COUNTY AND COULD AFFECT THE COMMUNITY OF 
  CASTELL.

A VERY SLOW MOVING STORM HAS ALREADY PRODUCED UP TO 2 INCHES OF RAIN 
OVER THE CASTELL AREA...AND ANOTHER 1 TO 2 INCHES OF RAIN IS 
POSSIBLE FROM THIS SECOND THUNDERSTORMS. THIS SECOND STORM WILL 
LIKELY PRODUCE FLASH FLOODING OF LOW WATER CROSSINGS OVER NORMALLY 
DRY WASHES AND THE SMALLER TRIBUTARIES TO THE LLANO RIVER.

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 3085 9895 3062 9896 3062 9869 3086 9869

$$
1 follow-up statement
000 
WGUS74 KEWX 140020
FFSSAT
TXC299-140200-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
720 PM CDT THU MAY 13 2004

...A FLASH FLOOD WARNING CONTINUES UNTIL 900 PM CDT FOR LLANO
COUNTY...

AT 715 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE A THUNDERSTORM PRODUCING VERY HEAVY RAINFALL.  THIS STORM 
WAS LOCATED 15 MILES WEST OF LLANO...MOVING EAST AT 15 MPH.  DOPPLER 
RADAR ESTIMATED RAINFALL TOTALS OF 3 TO 5 INCHES ACROSS WESTERN 
LLANO COUNTY.

THE THIS THUNDERSTORM WITH EXCESSIVE RAIN WILL OTHERWISE REMAIN OVER
MAINLY RURAL AREAS OF THE INDICATED COUNTY.

BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODING. 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.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE.

LAT...LON 3091 9904 3058 9899 3058 9855 3089 9859

$$

MSL

The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 8:28 AM CDTFlash Flood WarningEWXWilliamson3 hr
May 13, 11:29 AM CDTFlash Flood WarningEWXWilliamson2 hr
May 13, 2:17 PM CDTSevere Thunderstorm WarningEWXWilson58 min
May 13, 2:30 PM CDTFlash Flood WarningEWXGonzales, Karnes, Wilson3 hr
May 13, 3:02 PM CDTFlash Flood WarningEWXBastrop, Caldwell, Fayette4 hr
May 13, 3:36 PM CDTTornado WarningEWXKarnes54 min
May 13, 4:34 PM CDTFlash Flood WarningEWXDeWitt, Gonzales, Karnes, Lavaca, Wilson3 hr
May 13, 4:40 PM CDTFlash Flood WarningEWXKarnes3 hr
May 13, 6:24 PM CDTSevere Thunderstorm WarningEWXLlano66 min

Nearby

Flash Flood Warnings in Texas, 2004Every flash flood warning in 2004

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.