Alert archive / Texas / Flash Flood Warnings in 2004

Flash Flood Warning 372, NWS Austin/San Antonio, TX

November 20, 2004Travis County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Nov 20, 2004, 12:13 PM CST for Travis 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
Nov 20, 2004, 12:13 PM CST (18:13 UTC)
Expired
Nov 20, 2004, 2:15 PM CST
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

County Travis County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 6.2 hours before the alert went out and 287 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, Fort Worth, TX at 12:00Z on 2004-11-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 36 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Fort Worth, TX at 12:00Z on 2004-11-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 35 square meters per square second.1939587897Sfc1 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
36 J/kg
Mixed-layer CIN
-119 J/kg
Mixed-layer LCL
895 m above ground
0-6 km bulk shear
48 kt
0-1 km storm-relative helicity
35 m²/s²
0-3 km storm-relative helicity
91 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 201815
FFWEWX
TXC453-202015-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1213 PM CST SAT NOV 20 2004

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL 215 PM CST

* AT 1210 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM OVER THE WARNED AREA.

* LOCATIONS IN THE WARNING INCLUDE WEST LAKE HILLS...ROLLINGWOOD...
  MANSFIELD DAM...MANOR...BEE CAVE AND AUSTIN.

THUNDERSTORMS WITH HEAVY RAIN OF 1 TO 2 INCHES WILL CAUSE FLASH 
FLOODING ACROSS THE AUSTIN AREA OVER THE NEXT COUPLE HOURS AS THE 
STORMS TRAIN NORTHEASTWARD AT 25 MPH.  SOME PEA SIZE HAIL CAN ALSO 
BE EXPECTED.

IF FLASH FLOODING IS OBSERVED ACT QUICKLY. MOVE UP TO HIGHER GROUND. 
DO NOT STAY IN FLOOD PRONE AREAS.  MOTORISTS SHOULD USE EXTREME 
CAUTION DUE TO RISING WATERS OVER ROADS AND LOW WATER CROSSINGS.

LAT...LON 3028 9798 3006 9774 3040 9745 3044 9796

$$
1 follow-up statement
000 
WGUS74 KEWX 201945
FFSEWX
TXC453-202015-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
145 PM CST SAT NOV 20 2004

...A FLASH FLOOD WARNING CONTINUES UNTIL 215 PM CST FOR TRAVIS
COUNTY...

AT 142 PM CST...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO 
INDICATE SHOWERS WITH LOCALLY HEAVY RAIN MOVING NORTHEEAST OVER THE 
WARNED AREA.  THE SHOWERS HAVE DECREASING IN INTENSITY...HOWEVER 
RUNOFF AND FLOODING WILL CONTINUE.

HEAVY RAINFALL WILL CAUSE FLASH FLOODING OVER SMALL CREEKS AND 
STREAMS...URBAN AREAS...HIGHWAYS...STREETS...UNDERPASSES AND POORLY 
DRAINED AREAS.

LAT...LON 3028 9798 3006 9774 3040 9745 3044 9796

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Nov 20, 2:54 PM CSTSevere Thunderstorm WarningEWXBurnet21 min
Nov 20, 4:36 PM CSTFlash Flood WarningEWXDeWitt114 min
Nov 20, 5:12 PM CSTFlash Flood WarningEWXLavaca3 hr
Nov 20, 5:59 PM CSTSevere Thunderstorm WarningEWXLavaca61 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.