Alert archive / Texas / Flash Flood Warnings in 1991

Flash Flood Warning 93, NWS Austin/San Antonio, TX

December 21, 1991Hays County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Dec 21, 1991, 3:51 AM CST for Hays County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Dec 21, 1991, 3:51 AM CST (09:51 UTC)
Expired
Dec 21, 1991, 7:30 AM CST
In force
4 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Hays County, TX

The nearest sounding before it

Stephenville/Cla, TX (KSEP), launched 00:00Z, 9.9 hours before the alert went out and 240 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, Stephenville/Cla, TX at 00:00Z on 1991-12-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Stephenville/Cla, TX at 00:00Z on 1991-12-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -6 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
543 m above ground
0-6 km bulk shear
66 kt
0-1 km storm-relative helicity
-6 m²/s²
0-3 km storm-relative helicity
-134 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 KAUS 210952
FFWAUS
TXC281-031-053-209-299-453-491-211330-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN TX
351 AM CST SAT DEC 21 1991
 
THE NATIONAL WEATHER SERVICE IN AUSTIN HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  730 AM CST
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN NORTH CENTRAL TEXAS
 
   ...LAMPASAS COUNTY
 
IN SOUTH CENTRAL TEXAS
 
   ...BLANCO COUNTY...BURNET COUNTY...HAYS COUNTY...EASTERN LLANO COUN
   ...TRAVIS COUNTY...WILLIAMSON COUNTY
 
AT 345 AM...RADAR SHOWED WIDESPREAD MODERATE TO HEAVY RAINFALL OVER
MUCH OF CENTRAL TEXAS AND IN THE HILL COUNTRY. VERY HEAVY RAIN WAS
OCCURRING OVER ALREADY SATURATED GROUNDS AND RUNOFF WILL PRODUCE FLASH
FLOODING...ESPECIALLY ALONG CREEKS AND RIVERS.
 
THEREFORE...THE FLASH FLOOD WARNING FOR THE ABOVE COUNTIES HAS BEEN
EXTENDED UNTIL 730 AM.
 
THIS IS AN EXTREMELY DANGEROUS SITUATION.  THE MAIN STORM SYSTEM
REMAINS ANCHORED OUT TO OUR WEST...AND WITH ABUNDANT MOISTURE IN
PLACE...ADDITIONAL HEAVY RAINFALL WILL LIKELY CONTINUE AS DISTURBANCES
ROTATE EASTWARD ACROSS CENTRAL TEXAS.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.

The office that day

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

IssuedProductOfficeCountiesLasted
Dec 20, 7:57 PM CSTFlash Flood WarningEWXHays, Travis, Williamson3 hr
Dec 20, 7:57 PM CSTFlash Flood WarningEWXLampasas, Mills3 hr
Dec 20, 7:57 PM CSTFlash Flood WarningEWXGillespie3 hr
Dec 20, 9:04 PM CSTFlash Flood WarningEWXBandera, Edwards, Kendall, Kerr, Real9 hr
Dec 20, 9:28 PM CSTFlash Flood WarningEWXLee, Milam3 hr
Dec 20, 9:28 PM CSTFlash Flood WarningEWXBastrop3 hr
Dec 20, 10:45 PM CSTFlash Flood WarningEWXHays, Travis2 hr
Dec 20, 11:30 PM CSTFlash Flood WarningEWXUvalde4 hr
Dec 20, 11:47 PM CSTFlash Flood WarningEWXComal6 hr
Dec 21, 1:04 AM CSTFlash Flood WarningEWXBlanco, Hays, Travis3 hr
Dec 21, 1:22 AM CSTFlash Flood WarningEWXBurnet, Llano3 hr
Dec 21, 1:22 AM CSTFlash Flood WarningEWXWilliamson3 hr
Dec 21, 1:22 AM CSTFlash Flood WarningEWXLampasas3 hr
Dec 21, 2:51 AM CSTFlash Flood WarningEWXKinney, Uvalde7 hr
Dec 21, 3:25 AM CSTFlash Flood WarningEWXBastrop, Burleson, Lee, Milam4 hr
Dec 21, 3:25 AM CSTFlash Flood WarningEWXCaldwell4 hr
Dec 21, 3:51 AM CSTFlash Flood WarningEWXBlanco, Burnet, Lampasas, Llano, Travis, Williamson4 hr
Dec 21, 8:36 AM CSTFlash Flood WarningEWXLavaca2 hr
Dec 21, 8:40 AM CSTFlash Flood WarningEWXWebb5 hr
Dec 21, 10:55 AM CSTFlash Flood WarningEWXLavaca2 hr
Dec 21, 11:05 AM CSTFlash Flood WarningEWXMilam7 hr
Dec 21, 3:25 PM CSTFlash Flood WarningEWXLavaca2 hr

Nearby

Flash Flood Warnings in Texas, 1991Every flash flood warning in 1991

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.