Alert archive / Texas / Flash Flood Warnings in 1998

Flash Flood Warning 136, NWS Austin/San Antonio, TX

August 31, 1998Uvalde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Aug 31, 1998, 4:37 PM CDT for Uvalde 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 counties it named.

The facts

Issued
Aug 31, 1998, 4:37 PM CDT (21:37 UTC)
Expired
Aug 31, 1998, 6:40 PM CDT
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Uvalde County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 9.6 hours before the alert went out and 104 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 1998-08-31Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1176 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 1998-08-31The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -50 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
1176 J/kg
Mixed-layer CIN
-61 J/kg
Mixed-layer LCL
1149 m above ground
0-6 km bulk shear
6 kt
0-1 km storm-relative helicity
-50 m²/s²
0-3 km storm-relative helicity
8 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 
TTAA00 KSAT 312137
FFWSAT
TXC463-312340-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
437 PM CDT MON AUG 31 1998

THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  UVALDE COUNTY IN SOUTH CENTRAL TEXAS

* UNTIL 640 PM CDT

* FLASH FLOODING EXPECTED ACROSS UVALDE COUNTY AS STRONG
THUNDERSTORMS MOVE SOUTHWESTWARD ACROSS THE COUNTY.
*
IF YOU ARE IN THESE AREAS... MOVE TO HIGHER GROUND. DO NOT DRIVE
THROUGH WATER COVERING THE ROAD.

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 30, 7:25 PM CDTSevere Thunderstorm WarningEWXBandera65 min
Aug 30, 7:36 PM CDTSevere Thunderstorm WarningEWXHays, Travis64 min
Aug 30, 8:09 PM CDTSevere Thunderstorm WarningEWXCaldwell61 min
Aug 30, 8:35 PM CDTFlash Flood WarningEWXMedina3 hr
Aug 31, 3:30 PM CDTSevere Thunderstorm WarningEWXEdwards60 min
Aug 31, 3:50 PM CDTFlash Flood WarningEWXBexar80 min

Nearby

Flash Flood Warnings in Texas, 1998Every flash flood warning in 1998

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.