Alert archive / Texas / Flash Flood Warnings in 1997

Flash Flood Warning 170, NWS Austin/San Antonio, TX

June 21, 1997Lavaca County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jun 21, 1997, 5:17 PM CDT for Lavaca County, Texas. It was in force for 6 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
Jun 21, 1997, 5:17 PM CDT (22:17 UTC)
Expired
Jun 21, 1997, 11:15 PM CDT
In force
6 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Lavaca County, TX

The radar

The Austin/San Antonio radar (KEWX), 112 km from the middle of the area, began a volume at 22:20 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, 10.3 hours before the alert went out and 188 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 1997-06-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3868 joules per kilogram.LCLEL10008507005003002001001 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 1997-06-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 69 square meters per square second.193958Sfc1 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
3868 J/kg
Mixed-layer CIN
-1 J/kg
Mixed-layer LCL
570 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
69 m²/s²
0-3 km storm-relative helicity
73 m²/s²
Significant tornado parameter
1.0
Supercell composite
5.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 212217
FFWSAT
TXC019-285-220415-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
517 PM CDT SAT JUN 21 1997
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 1115 PM CDT
FOR PEOPLE IN THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL TEXAS
 
   ...BANDERA COUNTY...LAVACA COUNTY
 
AT 510 PM...NATIONAL WEATHER SERVICE RADAR INDICATED NUMEROUS SHOWERS
AND THUNDERSTORMS WITH VERY HEAVY RAIN CONTINUING ACROSS BANDERA COUNTY.
SOME AREAS HAVE RECEIVED OVER 6 INCHES OF RAIN AND NEW SHOWERS AND
THUNDERSTORMS CONTINUE TO REDEVELOP ACROSS THE AREA.
 
ADDITIONAL RAIN...HEAVY AT TIMES...THIS EVENING WILL PRODUCE MORE
FLOODING.
 
IN LAVACA COUNTY...DANGEROUS AND POTENTIALLY LIFE THREATENING FLOODING
MAY BE ONGOING.  RADAR INDICATED 6 TO 10 INCHES OF RAIN HAS FALLEN
NEAR SPEAKS AND WEST TO THE COUNTY LINE NEAR HIGHWAY 77.
 
ADDITIONAL HEAVY RAIN AND FLOODING IS EXPECTED TO CONTINUE THIS
EVENING WITH A STRONG POTENTIAL FOR THUNDERSTORM REDEVELOPMENT
OVERNIGHT TONIGHT.
 
AVOID ALREADY FLOODED AREAS.  TRAVELERS SHOULD NOT ATTEMPT TO
CROSS FLOODED ROADS.  IF YOUR VEHICLE STALLS...LEAVE IT AND MOVE
IMMEDIATELY TO HIGHER GROUND IF YOU CAN DO SO SAFELY.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT IS
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS AND OTHER
PEOPLE IN RECREATION AREAS ALONG CREEKS...STREAMS...AND RIVERS IN
THE WARNING AREA SHOULD MOVE TO HIGH GROUND IMMEDIATELY.
 
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.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 20, 7:51 PM CDTSevere Thunderstorm WarningEWXVal Verde69 min
Jun 20, 8:57 PM CDTSevere Thunderstorm WarningEWXVal Verde63 min
Jun 21, 1:51 AM CDTFlash Flood WarningEWXKerr3 hr
Jun 21, 6:01 AM CDTFlash Flood WarningEWXFrio3 hr
Jun 21, 7:30 AM CDTFlash Flood WarningEWXAtascosa3 hr
Jun 21, 7:45 AM CDTFlash Flood WarningEWXBexar3 hr
Jun 21, 9:01 AM CDTFlash Flood WarningEWXFrio119 min
Jun 21, 9:33 AM CDTFlash Flood WarningEWXGonzales, Guadalupe, Wilson3 hr
Jun 21, 10:25 AM CDTFlash Flood WarningEWXDeWitt, Karnes3 hr
Jun 21, 10:39 AM CDTFlash Flood WarningEWXBandera, Medina3 hr
Jun 21, 10:59 AM CDTFlash Flood WarningEWXCaldwell3 hr
Jun 21, 11:16 AM CDTFlash Flood WarningEWXBastrop, Fayette, Lavaca3 hr
Jun 21, 11:16 AM CDTFlash Flood WarningEWXBlanco, Comal, Hays, Travis3 hr
Jun 21, 11:16 AM CDTFlash Flood WarningEWXKendall3 hr
Jun 21, 11:38 AM CDTFlash Flood WarningEWXBandera, Bexar3 hr
Jun 21, 12:08 PM CDTFlash Flood WarningEWXLee, Williamson3 hr
Jun 21, 1:25 PM CDTFlash Flood WarningEWXGuadalupe3 hr
Jun 21, 1:25 PM CDTFlash Flood WarningEWXGillespie3 hr
Jun 21, 1:25 PM CDTFlash Flood WarningEWXDeWitt3 hr
Jun 21, 1:25 PM CDTFlash Flood WarningEWXBandera3 hr
Jun 21, 2:07 PM CDTFlash Flood WarningEWXKendall, Kerr3 hr
Jun 21, 2:07 PM CDTFlash Flood WarningEWXLavaca3 hr
Jun 21, 3:20 PM CDTFlash Flood WarningEWXBexar, Medina3 hr
Jun 21, 3:20 PM CDTFlash Flood WarningEWXComal3 hr
Jun 21, 3:36 PM CDTFlash Flood WarningEWXKarnes3 hr
Jun 21, 4:39 PM CDTFlash Flood WarningEWXGuadalupe6 hr
Jun 21, 4:39 PM CDTFlash Flood WarningEWXBandera6 hr
Jun 21, 4:39 PM CDTFlash Flood WarningEWXDeWitt6 hr
Jun 21, 5:09 PM CDTFlash Flood WarningEWXCaldwell, Travis6 hr
Jun 21, 5:17 PM CDTFlash Flood WarningEWXBandera6 hr
Jun 21, 5:42 PM CDTFlash Flood WarningEWXHays6 hr
Jun 21, 6:16 PM CDTFlash Flood WarningEWXBexar, Comal3 hr

Nearby

Flash Flood Warnings in Texas, 1997Every flash flood warning in 1997

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.