Alert archive / Texas / Flash Flood Warnings in 2004

Flash Flood Warning 21, NWS Austin/San Antonio, TX

April 2, 2004Comal County, Guadalupe County, Maverick County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Apr 2, 2004, 1:21 PM CST for Comal County, Guadalupe County, Maverick County, Texas. It was in force for 186 days. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Apr 2, 2004, 1:21 PM CST (19:21 UTC)
Expired
Oct 5, 2004, 6:15 AM CDT
In force
186 days
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

Counties Comal County, TX, Guadalupe County, TX, Maverick County, TX

The radar

The Austin/San Antonio radar (KEWX), 15 km from the middle of the area, began a volume at 19:23 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

Corpus Christi, TX (KCRP), launched 12:00Z, 7.4 hours before the alert went out and 235 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 2004-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 891 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, Corpus Christi, TX at 12:00Z on 2004-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 106 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
891 J/kg
Mixed-layer CIN
-15 J/kg
Mixed-layer LCL
618 m above ground
0-6 km bulk shear
31 kt
0-1 km storm-relative helicity
106 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.3
Supercell composite
2.4

Open this sounding in Storm Lab

The text

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

000 
WGUS54 KEWX 021922
FFWSAT
TXC091-187-022045-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
121 PM CST FRI APR 2 2004

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  COMAL
  GUADALUPE

* UNTIL 245 PM CST

* AT 121 PM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY 
  RAINS OF 2 TO 3 INCHES HAD FALLEN OVER PARTS OF CANYON LAKE AND 
  THE CITY OF SEGUIN. THESE HEAVY RAINS WILL RESULT IN FLASH 
  FLOODING ACROSS PARTS OF COMAL AND GUADALUPE COUNTIES THROUGH 
  245 PM.

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 2978 9840 2946 9803 2960 9777 2994 9832

$$
1 follow-up statement
000 
WGUS54 KEWX 050814
FFWSAT
TXC323-051115-
/X.NEW.KEWX.FF.W.0021.041005T0812Z-041005T1115Z/
/0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
312 AM CDT TUE OCT 5 2004

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

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

* UNTIL 615 AM CDT

* AT 308 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
  VERY HEAVY RAIN FROM A THUNDERSTORM LOCATED JUST NORTH OF EAGLE
  PASS. THIS STORM WAS NEARLY STATIONARY. RAINFALL RATES OF 3 INCHES
  AN HOUR WERE BEING ESTIMATED BY RADAR.

* THE STORM PRODUCING VERY HEAVY RAIN WILL IMPACT HIGHWAYS 277 AND 57 
  NORTH AND EAST OF EAGLE PASS.

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. DO NOT STAY IN FLOOD PRONE AREAS.

LAT...LON 2859 10041 2865 10016 2907 10015 2905 10038
      2906 10065

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 2, 11:03 AM CSTFlash Flood WarningEWXBexar, Medina, Val Verde186 days
Apr 2, 1:59 PM CSTSevere Thunderstorm WarningEWXKinney91 min
Apr 2, 2:42 PM CSTFlash Flood WarningEWXDeWitt, Karnes, Kinney186 days
Apr 2, 2:48 PM CSTFlash Flood WarningEWXFayette, Maverick186 days
Apr 2, 5:04 PM CSTSevere Thunderstorm WarningEWXFrio56 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; radar from the NEXRAD Level II archive.