Alert archive / Texas / Flash Flood Warnings in 1998

Flash Flood Warning 5, NWS Austin/San Antonio, TX

January 6, 1998Bexar County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jan 6, 1998, 12:41 PM CST for Bexar 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
Jan 6, 1998, 12:41 PM CST (18:41 UTC)
Expired
Jan 6, 1998, 2:45 PM CST
In force
2 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Bexar County, TX

The radar

The Austin/San Antonio radar (KEWX), 55 km from the middle of the area, began a volume at 18:41 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, 6.7 hours before the alert went out and 223 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 1998-01-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1989 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, Corpus Christi, TX at 12:00Z on 1998-01-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 101 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
1989 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
476 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
101 m²/s²
0-3 km storm-relative helicity
124 m²/s²
Significant tornado parameter
0.5
Supercell composite
2.7

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 061842
FFWSAT
TXC029-062045-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
1241 PM CST TUE JAN 6 1998
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  245 PM CST
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTH CENTRAL TEXAS
 
   ...BEXAR COUNTY
 
AT 12:40 PM...RADAR INDICATED STRONG THUNDERSTORMS CONTINUING OVER
NORTHERN BEXAR COUNTY. THESE STORMS ARE MOVING NORTH AT 15 MPH AND
ARE PRODUCING RAINFALL RATES OF UP TO ONE AND ONE HALF INCHES PER
HOUR. ADDITIONAL STORMS WILL MOVE INTO WESTERN AND NORTHERN BEXAR
COUNTY THROUGHOUT THE AFTERNOON.
 
FLOOD PRONE URBAN AREAS FILL WITH WATER QUICKLY.  CLOGGED STORM
DRAINS MAY CAUSE OTHER AREAS TO FLOOD.  DO NOT DRIVE THROUGH
FLOOD WATERS AND STAY AWAY FROM STORM DRAINS.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IMMINENT.
MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES.  DO NOT ATTEMPT TO
CROSS BRIDGES...OR LOW SPOTS IF WATER COVERS THE ROADWAY.  NEVER TRY
TO CROSS A FLOWING STREAM...EVEN A SMALL ONE...ON FOOT TO ESCAPE
RISING WATER DURING THREATENING RAINS.

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

In the hours before

Local storm report, Jan 6, 11:13 AM CST, 1 hour 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TEXAS
1113 AM CST TUE JAN 06 1998

TIME(CST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....
 1010 AM    COUPLAND                  TX   1.75 INCH HAIL
01/06/98   WILLIAMSON
Local storm report, Jan 6, 11:13 AM CST, 1 hour 28 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TEXAS
1113 AM CST TUE JAN 06 1998

TIME(CST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....
 1010 AM    COUPLAND                  TX   1.75 INCH HAIL
01/06/98   WILLIAMSON

The office that day

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

IssuedProductOfficeCountiesLasted
Jan 5, 10:40 PM CSTSevere Thunderstorm WarningEWXBurnet50 min
Jan 6, 6:56 AM CSTFlash Flood WarningEWXBandera, Gillespie, Kerr5 hr
Jan 6, 8:11 AM CSTFlash Flood WarningEWXLlano4 hr
Jan 6, 8:45 AM CSTSevere Thunderstorm WarningEWXGillespie60 min
Jan 6, 9:52 AM CSTSevere Thunderstorm WarningEWXWilliamson68 min
Jan 6, 11:02 AM CSTSevere Thunderstorm WarningEWXFrio43 min
Jan 6, 11:51 AM CSTFlash Flood WarningEWXFrio69 min
Jan 6, 11:51 AM CSTSevere Thunderstorm WarningEWXFrio69 min
Jan 6, 12:17 PM CSTFlash Flood WarningEWXMedina3 hr
Jan 6, 12:55 PM CSTFlash Flood WarningEWXFrio2 hr
Jan 6, 1:31 PM CSTSevere Thunderstorm WarningEWXAtascosa59 min
Jan 6, 2:08 PM CSTFlash Flood WarningEWXAtascosa2 hr
Jan 6, 2:32 PM CSTFlash Flood WarningEWXBexar, Comal118 min
Jan 6, 4:13 PM CSTFlash Flood WarningEWXDeWitt, Gonzales, Lavaca3 hr

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; radar from the NEXRAD Level II archive.