Alert archive / Texas / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 92, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 20, 1987, 6:13 PM CDT for Bexar County, Texas. It was in force for 2 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- May 20, 1987, 6:13 PM CDT (23:13 UTC)
- Expired
- May 20, 1987, 8:15 PM CDT
- In force
- 2 hr
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Bexar County, TX
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 20, 6:47 PM CDT | Hail 1.75 | Bexar, TX |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
Victoria Regiona, TX (KVCT), launched 12:00Z, 11.2 hours before the alert went out and 171 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
- 1847 J/kg
- Mixed-layer CIN
- -22 J/kg
- Mixed-layer LCL
- 564 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 159 m²/s²
- 0-3 km storm-relative helicity
- 257 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 4.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSAT 202313
SVRSAT
TXC029-210115-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
613 PM CDT WED MAY 20 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 815 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH TEXAS
...EASTERN BEXAR
A SEVERE THUNDERSTORM HAS DEVELOPED ALONG THE WILSON BEXAR COUNTY
LINE AND IS MOVING NORTH AT 10 TO 15 MPH. RADAR HAS INDICATED HAIL IN
THIS STORM. PERSONS TRAVELING IN THIS AREA SHOULD AVOID LOW WATER
CROSSINGS.
REMEMBER SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MP
...HAIL 3/4 INCH OR MORE IN DIAMETER...FREQUENT LIGHTNING AND VERY HEA
RAIN. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE TORNADOES
WITH LITTLE OR NO WARNING.
PLEASE LISTEN TO YOUR LOCAL RADIO...TV OR NOAA WEATHER RADIO STATION
FOR LATER STATEMENTS OR WARNINGS REGARDING THIS SEVERE WEATHER EVENT.What forecasters said that day
The local office's own words before this severe thunderstorm 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, May 20, 5:14 PM CDT, 59 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN ANTONIO TX 515 PM CDT WED MAY 20 1987 HONDO RADAR INDICATES A THUNDERSTORM HAS DEVELOPED IN THE DILLEY AREA... IN SOUTHERN FRIO COUNTY...DURING THE PAST HALF HOUR. THIS THUNDERSTORM LIKELY CONTAINS SMALL HAIL...FREQUENT LIGHTNING... GUSTY WINDS AND LOCALLY HEAVY RAIN WHICH MAY CAUSE LOCALIZED FLOODING OF LOW-LYING AREAS IN AND AROUND DILLEY AND SOUTHERN FRIO COUNTY. THE FRIO RIVER MAY COLLECT SOME OF THIS RUNOFF AND REFLECT SMALL RISES DOWNSTREAM BELOW DILLEY TONIGHT. THE MOVEMENT OF THIS THUNDERSTORM IS TOWARD THE NORTHEAST...WHICH WILL TRACK IT ALONG INTERSTATE 35. TRAVEL BETWEEN DEVINE...PEARSALL AND DILLEY MAY BE RESTRICTED BY HEAVY RAIN...SLICK ROADWAYS AND REDUCED VISIBILITY FOR ANOTHER HOUR OR SO. ADDITIONAL STATEMENTS OR WARNINGS WILL BE ISSUED AS CONDITIONS WARRANT...SO PLEASE STAY TUNED.
Special weather statement, May 20, 6:06 PM CDT, 7 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN ANTONIO TX 610 PM CDT WED MAY 20 1987 HONDO RADAR INDICATES A THUNDERSTORM HAS DEVELOPED BETWEEN SAN ANTONIO AND FLORESVILLE...IN EXTREME WESTERN WILSON COUNTY. THIS THUNDERSTORM LIKELY CONTAINS SMALL HAIL...FREQUENT LIGHTNING... GUSTY WINDS AND LOCALLY HEAVY RAIN WHICH MAY CAUSE LOCALIZED FLOODING OF LOW-LYING AREAS BETWEEN SAN ANTONIO AND FLORESVILLE. FISHERMEN AND BOATERS CLOSE TO BRAUNIG LAKE AND CALAVERAS LAKE SHOULD SEEK SHELTER AND MOVE TO SHORE AND AWAY FROM THE WATER AT ONCE. THE MOVEMENT OF THIS THUNDERSTORM WILL TAKE IT ACROSS EXTREME EASTERN BEXAR COUNTY...TO THE EAST OF THE CITY OF SAN ANTONIO. MOTORISTS ON US 181 SHOULD BE ALERT FOR REDUCED VISIBILITIES IN HEAVY RAIN...AS WELL AS SLICK AND WET ROADS AND HIGHWAYS. ADDITIONAL STATEMENTS OR WARNINGS WILL BE ISSUED AS CONDITIONS WARRANT...SO PLEASE STAY TUNED.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 19, 7:26 PM CDT | Flash Flood Warning | EWX | Bexar | 3 hr |
| May 19, 8:00 PM CDT | Severe Thunderstorm Warning | EWX | Bexar | 60 min |
| May 19, 8:09 PM CDT | Flash Flood Warning | EWX | Guadalupe | 3 hr |
| May 19, 8:28 PM CDT | Tornado Warning | EWX | Bexar | 62 min |
| May 19, 8:50 PM CDT | Severe Thunderstorm Warning | EWX | McMullen | 55 min |
| May 19, 9:16 PM CDT | Severe Thunderstorm Warning | EWX | Guadalupe | 59 min |
| May 19, 9:39 PM CDT | Severe Thunderstorm Warning | EWX | Wilson | 66 min |
| May 19, 10:55 PM CDT | Severe Thunderstorm Warning | EWX | Gonzales, Karnes | 65 min |
| May 19, 11:20 PM CDT | Severe Thunderstorm Warning | EWX | DeWitt | 55 min |
| May 20, 12:05 AM CDT | Severe Thunderstorm Warning | EWX | Lavaca | 55 min |
| May 20, 5:44 PM CDT | Severe Thunderstorm Warning | EWX | Frio | 61 min |
| May 20, 6:39 PM CDT | Severe Thunderstorm Warning | EWX | Frio | 66 min |
Nearby
Severe Thunderstorm Warnings in Texas, 1987Every severe thunderstorm 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.