Alert archive / Texas / Flash Flood Warnings in 1987

Flash Flood Warning 51, NWS Austin/San Antonio, TX

June 4, 1987Gonzales County, Texas

NWS Austin/San Antonio, TX issued this flash flood warning at Jun 4, 1987, 5:02 AM CDT for Gonzales County, Texas. It was in force for 4 hr.

The area

The counties it named.

The facts

Issued
Jun 4, 1987, 5:02 AM CDT (10:02 UTC)
Expired
Jun 4, 1987, 9:00 AM CDT
In force
4 hr
Issued by
NWS Austin/San Antonio, TX
Area
Whole counties

County Gonzales County, TX

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Victoria Regiona, TX (KVCT), launched 00:00Z, 10.0 hours before the alert went out and 89 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, Victoria Regiona, TX at 00:00Z on 1987-06-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 175 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, Victoria Regiona, TX at 00:00Z on 1987-06-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 79 square meters per square second.1939Sfc1 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
175 J/kg
Mixed-layer CIN
-177 J/kg
Mixed-layer LCL
986 m above ground
0-6 km bulk shear
35 kt
0-1 km storm-relative helicity
79 m²/s²
0-3 km storm-relative helicity
132 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAT 041002
FFWSAT
TXC177-041400-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
502 AM CDT THU JUN 4 1987
 
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL  900 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
 
IN SOUTH TEXAS
          ...GONZALES
 
VERY HEAVY RAINS CONTINUE ACROSS GONZALES COUNTY AND THE RAINS ARE
EXPECTED TO CONTINUE FOR THE NEXT SEVERAL HOURS.  DURING THE PAST 3
HOURS THE HEAVIEST RAINS EXTEND ALONG A LINE FROM MATAGORDA BAY ON
THE CENTRAL TEXAS COAST NORTHWESTWARD ACROSS LAVACA COUNTY AND
GONAZLES COUNTY.  THE HEAVY RAINS ALSO EXTEND FARTHER NORTHWESTWARD
TOWARD AUSTIN.
 
 
A FLASH FLOOD WARNING MEANS 1THAT FLOODING IS IMMINENT OR HAS BEEN
REPORTED.

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

Special weather statement, Jun 3, 11:53 PM CDT, 5 hours 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE AUSTIN TX
1145 PM CDT WED JUN 3 1987

...THE FLASH FLOOD WATCH CONTINUES THROUGH THE NIGHT TONIGHT...

JUST BEFORE MIDNIGHT...WEATHER RADAR SHOWED SCATTERED HEAVY THUNDER-
STORMS FORMING IN THE SAN MARCOS AREA...MOVING WESTWARD AT 10 TO 15
MPH.  OTHER MOSTLY LIGHT RAINS WERE ALSO REDEVELOPING TO THE SOUTH
AND SOUTHEAST. WIDESPREAD RAINS COVER ABOUT 60 PERCENT OF CENTRAL
TEXAS..NORTH AND WEST OF A WACO...AUSTIN AND JUNCTION LINE.  OTHER
HEAVY SHOWERS REMAIN WEST AND NORTHWEST OF SAN ANTONIO...OVER THE
FLOODED MEDINA RIVER WATERSHED.

DURING THE LAST SEVERAL HOURS...RAIN ACTIVITY APPEARS TO BE INCREASING
IN AREAL COVERAGE, WITH ONLY A FEW SPOTS SHOWING INTENSITY LEVEL
INCREASES.  OUR MAIN CONCERN FOR THE NEXT 3 OR 4 HOURS WILL BE THOSE
COUNTIES TO THE SOUTH AND WEST OF AUSTIN, CALDWELL...HAYS...BLANCO AND
GILLESPIE.  PERSONS IN THOSE COUNTIES SHOULD STAY ALERT FOR THE ONSET
OF HEAVY RAIWNS AND BE PREPARED IF WARNINGS OR FLOODING TAKES PLACE.

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 4, 1:53 AM CDTFlash Flood WarningEWXGonzales3 hr
Jun 4, 3:10 AM CDTFlash Flood WarningEWXKendall110 min
Jun 4, 3:32 AM CDTFlash Flood WarningEWXCaldwell3 hr
Jun 4, 4:24 AM CDTFlash Flood WarningEWXTravis3 hr
Jun 4, 4:44 AM CDTFlash Flood WarningEWXLavaca2 hr
Jun 4, 6:35 AM CDTFlash Flood WarningEWXLavaca2 hr
Jun 4, 7:31 AM CDTFlash Flood WarningEWXCaldwell, Hays, Travis6 hr
Jun 4, 8:30 AM CDTFlash Flood WarningEWXLavaca2 hr
Jun 4, 8:46 AM CDTFlash Flood WarningEWXBurnet, Williamson3 hr
Jun 4, 8:47 AM CDTFlash Flood WarningEWXGonzales4 hr
Jun 4, 11:47 AM CDTFlash Flood WarningEWXBexar3 hr
Jun 4, 2:30 PM CDTSevere Thunderstorm WarningEWXCalhoun60 min
Jun 4, 4:08 PM CDTFlash Flood WarningEWXAtascosa, Frio4 hr

Nearby

Flash Flood Warnings in Texas, 1987Every flash flood warning in 1987

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.