Alert archive / Texas / Flash Flood Warnings in 2003

Flash Flood Warning 79, NWS Austin/San Antonio, TX

September 5, 2003Atascosa County, Wilson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Sep 5, 2003, 2:55 PM CDT for Atascosa County, Wilson County, 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 as issued.

The facts

Issued
Sep 5, 2003, 2:55 PM CDT (19:55 UTC)
Expired
Sep 5, 2003, 6:00 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Counties, with a storm outline in the text

Counties Atascosa County, TX, Wilson County, TX

The radar

The Austin/San Antonio radar (KEWX), 92 km from the middle of the area, began a volume at 19:57 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, 7.9 hours before the alert went out and 176 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 2003-09-05Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1835 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 2003-09-05The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -13 square meters per square second.1939Sfc1 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
1835 J/kg
Mixed-layer CIN
-19 J/kg
Mixed-layer LCL
611 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
-13 m²/s²
0-3 km storm-relative helicity
-11 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 051957
FFWSAT
TXC013-493-052300-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
255 PM CDT FRI SEP 5 2003

THE NATIONAL WEATHER SERVICE IN AUSTIN SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR THE FOLLOWING COUNTIES...
  WILSON
  ATASCOSA

* UNTIL 600 PM CDT

* AT 255 PM...WEATHER SERVICE DOPPLER RADAR INDICATED VERY HEAVY RAIN
  OVER SOUTHEAST WILSON COUNTY AND OVER NORTHERN ATASCOSA. THESE     
  AREAS ARE EXPECTED TO MERGE OVER ATASCOSA OVER THE NEXT HOUR AND 
  PRODUCE 1 TO 2 INCHES OF RAIN OVER THE NEXT COUPLE OF HOURS.

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.

LAT...LON 2868 9876 2870 9838 2910 9798 2933 9815
          2905 9840 2926 9879

$$
2 follow-up statements
000 
WGUS74 KEWX 052137
FFSSAT
TXC013-493-052300-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
437 PM CDT FRI SEP 5 2003

...A FLASH FLOOD WARNING CONTINUES FOR WILSON AND ATASCOSA COUNTIES 
UNTIL 600 PM CDT...

AT 435 PM...THE HEAVIEST RAINFALL WAS ALONG THE ATASCOSA COUNTY LINE 
WITH MCMULLEN AND LIVE OAK COUNTIES WITH RAINFALL RATES OF 1 TO 2 
INCHES PER HOUR.  THIS RAIN WAS MOVING SOUTH AND WILL EXIT ATASCOSA 
COUNTY BY 5 PM.  HOWEVER...LIGHT RAIN WILL PERSIST AND STREAMS WILL 
CONTINUE TO RISE FOR THE NEXT HOUR OR SO WITH LOW LYING AREAS AND 
LOW WATER CROSSINGS FLOODED.  

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. STAY TUNED TO LOCAL MEDIA OUTLETS FOR THE LATEST
WEATHER INFORMATION.

$$
000 
WGUS74 KEWX 052310
FFSSAT
TXC013-493-060000-

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
608 PM CDT FRI SEP 5 2003

...THE FLASH FLOOD WARNING FOR WILSON AND ATASCOSA COUNTIES HAS
EXPIRED...

NATIONAL WEATHER SERVICE RADAR INDICATED ONLY ISOLATED PATCHES OF 
LIGHT RAIN OVER ATASCOSA AND WILSON COUNTY.  THE FLOOD THREAT WAS 
DIMINISHING. SOME MINOR FLOODING OF LOW LYING AREAS AND LOW WATER 
CROSSINGS MAY CONTINUE...BUT THE THREAT OF SERIOUS FLOODING HAS 
ENDED AND THE FLASH FLOOD WARNING HAS EXPIRED.

STAY TUNED TO LOCAL MEDIA OUTLETS FOR THE LATEST WEATHER INFORMATION.

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 5, 1:02 PM CDTFlash Flood WarningEWXBexar3 hr
Sep 5, 2:23 PM CDTFlash Flood WarningEWXBandera3 hr

Nearby

Flash Flood Warnings in Texas, 2003Every 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.