Alert archive / Texas / Flash Flood Warnings in 1987
Flash Flood Warning 77, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Jun 12, 1987, 1:31 AM CDT for Dimmit County, La Salle County, Texas. It was in force for 4 hr.
The area
The counties it named.
The facts
- Issued
- Jun 12, 1987, 1:31 AM CDT (06:31 UTC)
- Expired
- Jun 12, 1987, 5:30 AM CDT
- In force
- 4 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
Counties Dimmit County, TX, La Salle 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
Del Rio, TX (KDRT), launched 00:00Z, 6.5 hours before the alert went out and 176 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.
- Mixed-layer CAPE
- 1550 J/kg
- Mixed-layer CIN
- -33 J/kg
- Mixed-layer LCL
- 1020 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- -0.1
- Supercell composite
- -0.4
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSAT 120631
FFWSAT
TXC127-283-121030-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
131 AM CDT FRI JUN 12 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 530 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN SOUTH TEXAS
...DIMMIT...LASALLE
RADAR INDICATES THAT THUNDERSTORMS PRODUCING HEAVY RAINFALL HAVE
MOVED INTO THE NORTHERN PORTIONS OF DIMMIT AND LASALLE COUNTIES.
THESE THUNDERSTORMS ARE MOVING VERY SLOWLY AND RAINFALL RATES OF UP
TO 3 INCHES PER HOUR ARE POSSIBLE. FLOODING OF LOW WATER CROSSINGS
AND LOW LYING AREAS IS POSSIBLE AND MOTORISTS SHOULD EXERCISE
CAUTION.
DANGEROUS LIGHTNING AND GUSTY WINDS OFTEN ACCOMPANY FLASH FLOOD
PRODUCING THUNDERSTORMS.
PLEASE LISTEN TO YOUR LOCAL RADIO...TV OR NOAA WEATHER RADIO STATION
FOR LATER STATEMENTS OR WARNINGS REGARDING THIS SEVERE WEATHER EVENT.
DANGEROUS LIGHTNING AND GUSTY WINDS OFTEN xACCOMPANY FLASH FLOODWhat 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 11, 8:06 PM CDT, 5 hours 25 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DEL RIO TX 810 PM CDT THU JUN 11 1987 AT 805 PM CDT RADAR INDICATED THUNDERSTORMS 50 MILES NORTHWEST OF DEL RIO. PANDALE CROSSING...60 MILES NORTHWEST OF DEL RIO...REPORTED THUNDERSTORMS WITH HEAVY RAIN...STRONG GUSTY WINDS AND FREQUENT DANGEROUS LIGHTNING DURING THE PAST FIVE MINUTES. THESE STORMS WERE MOVING TO THE EAST NORTHEAST AT 10 MPH...BUT ALSO BUILDING TO THE SOUTHEAST TOWARD DEL RIO. SOME LOW AREAS OF ROADWAYS MAY BECOME FLOODED...HIGHWAYS 163 AND 189 IN NORTHERN VAL VERDE COUNTY ARE ALREADY CLOSED. MOTORISTS ARE URGED TO USE CAUTION AND NOT TO ATTEMPT TO CROSS FLOODED LOW WATER CROSSINGS. CAMPERS AND CANOEISTS ALONG THE PECOS RIVER SHOULD USE EXTREME CAUTION...KEEP A LOOKOUT AND BE READY TO MOVE TO HIGHER GROUND.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 8:11 PM CDT | Flash Flood Warning | EWX | Bandera, Kerr | 4 hr |
| Jun 11, 8:18 PM CDT | Flash Flood Warning | EWX | Gillespie | 3 hr |
| Jun 11, 9:43 PM CDT | Flash Flood Warning | EWX | Uvalde | 3 hr |
| Jun 11, 11:06 PM CDT | Flash Flood Warning | EWX | Medina | 4 hr |
| Jun 12, 12:05 AM CDT | Flash Flood Warning | EWX | Frio | 4 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.