Alert archive / Texas / Flash Flood Warnings in 1997

Flash Flood Warning 47, NWS Austin/San Antonio, TX

April 25, 1997Val Verde County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Apr 25, 1997, 9:56 PM CDT for Val Verde 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: Apr 25, 1997, 9:56 PM CDT (02:56 UTC)
Expired: Apr 26, 1997, 1:00 AM CDT
In force: 3 hr
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties

County Val Verde County, TX

The nearest sounding before it

Del Rio, TX (KDRT), launched 00:00Z, 2.9 hours before the alert went out and 66 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 22 J/kg
Mixed-layer CIN: -210 J/kg
Mixed-layer LCL: 1669 m above ground
0-6 km bulk shear: 65 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 379 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 260258
FFWSAT
TXC465-260600-
 
BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
956 PM CDT FRI APR 25 1997
 
THE NATIONAL WEATHER SERVICE IN AUSTIN/SAN ANTONIO HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  100 AM CDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTH CENTRAL TEXAS
 
   ...VAL VERDE COUNTY
 
AT 950 PM CDT...DOPPLER RADAR INDICATED THUNDERSTORMS WITH VERY HEAVY
RAINFALL FROM 10 MILES SOUTHWEST OF DEL RIO TO 10 MILES SOUTH OF LAKE
AMISTAD DAM. THESE THUNDERSTORMS WILL MOVE INTO THE DEL RIO AND LAKE
AMISTAD AREAS WITHIN 20 MINUTES AS THEY ARE MOVING NORTHEAST AT 30 MILES
AN HOUR. RAINFALL RATES OF 1 TO 2 INCHES PER HOUR ARE BEING ESTIMATED.
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE
DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS OBSERVED
ACT QUICKLY.  MOVE UP TO HIGHER GROUND TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
 
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 DURINGz THREATENING RAINS.

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 25, 11:04 PM CDT	Severe Thunderstorm Warning	EWX	Edwards, Real	56 min
Apr 25, 11:11 PM CDT	Severe Thunderstorm Warning	EWX	Maverick	2 hr
Apr 25, 11:50 PM CDT	Flash Flood Warning	EWX	Uvalde	115 min
Apr 25, 11:50 PM CDT	Severe Thunderstorm Warning	EWX	Uvalde	115 min
Apr 25, 11:54 PM CDT	Severe Thunderstorm Warning	EWX	Kerr	66 min
Apr 26, 12:53 AM CDT	Flash Flood Warning	EWX	Bandera	2 hr
Apr 26, 1:11 AM CDT	Flash Flood Warning	EWX	Dimmit	2 hr
Apr 26, 1:11 AM CDT	Severe Thunderstorm Warning	EWX	Dimmit	2 hr
Apr 26, 1:25 AM CDT	Flash Flood Warning	EWX	Gillespie, Kerr	65 min
Apr 26, 1:25 AM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Kerr	65 min
Apr 26, 2:55 AM CDT	Severe Thunderstorm Warning	EWX	Atascosa	65 min
Apr 26, 3:12 AM CDT	Flash Flood Warning	EWX	Bandera	3 hr
Apr 26, 5:03 AM CDT	Flash Flood Warning	EWX	Hays, Travis	3 hr
Apr 26, 5:43 AM CDT	Flash Flood Warning	EWX	Williamson	3 hr

Nearby

Flash Flood Warnings in Texas, 1997 Every 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.