Alert archive / Texas / Flash Flood Warnings in 1987
Flash Flood Warning 27, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this flash flood warning at Jun 1, 1987, 11:42 PM CDT for Zavala County, Texas. It was in force for 2 hr.
The area
The counties it named.
The facts
- Issued
- Jun 1, 1987, 11:42 PM CDT (04:42 UTC)
- Expired
- Jun 2, 1987, 1:45 AM CDT
- In force
- 2 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Zavala 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, 4.7 hours before the alert went out and 119 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
- 3771 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 849 m above ground
- 0-6 km bulk shear
- 20 kt
- 0-1 km storm-relative helicity
- 27 m²/s²
- 0-3 km storm-relative helicity
- 190 m²/s²
- Significant tornado parameter
- 1.7
- Supercell composite
- 9.2
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSAT 020442
FFWSAT
TXC507-020645-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
1142 PM CDT MON JUN 1 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 145 AM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH TEXAS
...ZAVALA
VERY INTENSE THUNDERSTORMS HAVE CONTINUED OVER CENTRAL ZAVALA COUNTY
FOR THE PAST THIRTY MINUTES. RAINFALL HAS BEEN ESTIMATED AT NEAR 2
INCHES WITH THE SHERIFFS DEPARTMENT REPORTING STREETS ALREADY RUNNING
FULL AND HEAVY RAIN CONTINUING. FLASH FLOODING IS EXPECTED
ACROSS THE COUNTY AS THE SLOW MOVING STORMS CONTINUE FOR AT LEAST
ANOTHER HOUR.
A FLASH FLOOD WARNING MEANS THAT 9FLOODING 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 1, 7:47 PM CDT, 3 hours 55 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DEL RIO TX 745 PM CDT MON JUN 1 1987 ...THUNDERSTORMS ARE MOVING INTO THE DEL RIO-LAKE AMISTAD AREA... AT 735 PM CDT RADAR INDICATED A BAND OF THUNDERSTORMS FROM 20 TO 50 MILES NORTH AND WEST OF DEL RIO MOVING INTO THE DEL RIO-LAKE AMISTAD AREA AT AROUND 10 MPH. A PARTICULARLY INTENSE STORM IS ABOUT 40 MILES SOUTHWEST OF THE CITY OF DEL RIO AT THIS TIME MOVING EAST. OTHER THUNDERSTORMS AND SHOWERS STRECH BACK UP THE PECOS VALLEY INTO SOUTHERN NEW MEXICO AND ARE MOVING DOWN IT TO SOUTHEAST DOWN THE VALLEY OF THE PECOS INTO THE COUNTY. BOATERS SHOULD CONSIDER IMMEDIATELY SEEKING SAFE HARBOUR AS STRONG WINDS AND DANGEROUS LIGHTNING ARE LIKELY NEAR THESE STORMS. THE POSSIBLITY OF HEAVY RAINS WITH THESE STORMS IS HIGH AS THEY ARE MOVING SLOWLY EVERYONE DRIVING IN THE CITY AREA SHOULD BE PREPARED FOR THE FLOODING OF LOW WATER CROSSINGS. YOUR NATIONAL WEATHER SERVICE WILL ISSUE ADDITIONALS STATEMENTS...SO STAY TUNED TO YOUR LOCAL RADIO...TV OR NOAA WEATHER RADIO.
Special weather statement, Jun 1, 8:12 PM CDT, 3 hours 30 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN ANTONIO TX 812 PM CDT MON JUN 1 1987 SCATTERED THUNDERSTORMS WITH FREQUENT LIGHTNING AND VERY HEAVY RAIN HAVE CONTINUED FROM NORTHEAST WEBB COUNTY NORTHWARD TO NEAR COTULLA FOR THE PAST HOUR. THESE STORMS WERE MOVING TO THE NORTH AT NEAR 15 MPH. THE MOST INTENSE STORM WAS LOCATED IN NORTHEAST WEBB COUNTY AND WAS POISED TO MOVE OVER STATE HIGHWAY 44 WITHIN THE NEXT HALF HOUR. DUE TO THE HEAVY RAIN AND REDUCED VISIBILITY...TRAVEL MAY BE VERY DIFFICULT IN AND NEAR THIS STORM. MOTORISTS SHOULD ALSO BE ALERT TO BRIEF FLOODING OF LOW LYING AND POORLY DRAINED AREAS AROUND AND NEAR THESE STRONG THUNDERSTORMS FOR THE NEXT HOUR OR TWO. 1 NO ONE SHOULD ATTEMPT TO CROSS INTO DEEP WATER.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 1, 10:45 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 70 min |
| Jun 1, 11:05 PM CDT | Flash Flood Warning | EWX | Val Verde | 4 hr |
| Jun 2, 3:50 PM CDT | Flash Flood Warning | EWX | Guadalupe | 3 hr |
| Jun 2, 6:32 PM CDT | Flash Flood Warning | EWX | Gonzales, Wilson | 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.