Alert archive / Texas / Flash Flood Warnings in 1996

Flash Flood Warning 50, NWS Austin/San Antonio, TX

September 20, 1996Travis County, Williamson County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Sep 20, 1996, 7:46 PM CDT for Travis County, Williamson 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 counties it named.

The facts

Issued
Sep 20, 1996, 7:46 PM CDT (00:46 UTC)
Expired
Sep 20, 1996, 10:45 PM CDT
In force
3 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

Counties Travis County, TX, Williamson County, TX

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 0.8 hours before the alert went out and 263 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 00:00Z on 1996-09-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1680 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, Fort Worth, TX at 00:00Z on 1996-09-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 90 square meters per square second.19395878Sfc1 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
1680 J/kg
Mixed-layer CIN
-32 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
51 kt
0-1 km storm-relative helicity
90 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.9
Supercell composite
4.9

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 210050
FFWSAT
TXC453-491-210345-
 
BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
746 PM CDT FRI SEP 20 1996
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL
1045 PM CDT FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL TEXAS
 
   ...TRAVIS COUNTY...WILLIAMSON COUNTY...INCLUDING THE AUSTIN AND
      GEORGETOWN METRO AREAS...
 
AT 745 PM...DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS
EXTENDING FROM FORT HOOD TO MARBLE FALLS. MOVEMENT WAS SOUTHEAST AT 20
MILES PER HOUR. SINCE TRAVIS AND WILLIAMSON COUNTIES RECEIVED
SIGNIFICANT AMOUNTS OF RAIN THE PAST COUPLE OF NIGHTS...ANY ADDITIONAL
RAINFALL FROM THESE STORMS WILL CAUSE FLASH FLOODING.
 
ALTHOUGH NO TORNADOES HAVE BEEN DETECTED WITH THIS STORM...A
TORNADO WATCH REMAINS IN EFFECT.  SEVERE THUNDERSTORMS CAN AND
OCCASIONALLY DO PRODUCE TORNADOES WITH LITTLE OR NO ADVANCE WARNING
SO BE ON THE LOOKOUT.
 
PEOPLE IN THE PATH OF THIS STORM SHOULD BE ALERT TO THE POSSIBILITY
OF LARGE HAIL AND DAMAGING WINDS.  FREQUENT LIGHTNING AND LOCALLY
HEAVY RAIN CAN ALSO OCCUR WITH SEVERE THUNDERSTORMS...FLOODING SMALL
STREAMS...LOW AREAS...AND LOW WATER CROSSINGS.
 
IF YOU SEE SEVERE WEATHER TAKING PLACE...CALL YOUR REPORT TO
THE NEAREST LAW ENFORCEMENT AGENCY FOR IMMEDIATE RELAY TO THE
NATIONAL WEATHER SERVICE.

The office that day

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

IssuedProductOfficeCountiesLasted
Sep 20, 7:46 PM CDTSevere Thunderstorm WarningEWXTravis, Williamson3 hr
Sep 20, 7:56 PM CDTSevere Thunderstorm WarningEWXBurnet64 min
Sep 20, 8:18 PM CDTTornado WarningEWXBurnet, Travis57 min
Sep 20, 8:56 PM CDTTornado WarningEWXTravis64 min
Sep 20, 9:16 PM CDTSevere Thunderstorm WarningEWXHays59 min
Sep 20, 9:33 PM CDTSevere Thunderstorm WarningEWXBastrop, Lee117 min
Sep 20, 10:10 PM CDTSevere Thunderstorm WarningEWXHays65 min
Sep 20, 10:31 PM CDTSevere Thunderstorm WarningEWXCaldwell59 min
Sep 20, 10:50 PM CDTSevere Thunderstorm WarningEWXComal, Guadalupe55 min
Sep 21, 12:08 AM CDTSevere Thunderstorm WarningEWXLavaca52 min
Sep 21, 12:09 AM CDTTornado WarningEWXLavaca51 min
Sep 21, 12:40 AM CDTTornado WarningEWXDeWitt65 min

Nearby

Flash Flood Warnings in Texas, 1996Every flash flood warning in 1996

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.