Alert archive / Texas / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 96, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 20, 1987, 7:42 PM CDT for Comal County, Texas. It was in force for 63 min. 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, 7:42 PM CDT (00:42 UTC)
- Expired
- May 20, 1987, 8:45 PM CDT
- In force
- 63 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Comal 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, 8:30 PM CDT | Hail 1.75 | Comal, 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 00:00Z, 0.7 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
- 2069 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 921 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- 14 m²/s²
- 0-3 km storm-relative helicity
- 13 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.5
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KSAT 210042
SVRSAT
TXC091-210145-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE SAN ANTONIO TX
742 PM CDT WED MAY 20 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 845 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTY...
IN SOUTH TEXAS
...COMAL
AT 745 PM CDT...A SEVERE THUNDERSTORM WAS INDICATED BY RADAR BETWEEN
SAN ANTONIO AND NEW BRAUNFELS ON THE BEXAR-COMAL COUNTY LINE...ALONG
IH 35. THIS THUNDERSTORM IS MOVING TOWARD THE NORTH AT 15 MPH.
MARBLE-SIZED HAIL AND BRIEF HEAVY RAIN HAS BEEN REPORTED WITH THIS
STORM AS IT MOVED ACROSS NORTHEAST SAN ANTONIO DURING THE PAST HOUR.
SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...HAIL
3/4 INCH OR MORE IN DIAMETER...FREQUENT LIGHTNING AND VERY HEAVY
RAIN.
WHEN A THUNDERSTORM THREATENS...SEEK SHELTER INSIDE A HOME OR
BUILDING AWAY FROM DOORS AND WINDOWS. REFRAIN FROM USING ELECTRICAL
APPLIANCES.
YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY TO RELAY YOUR
SEVERE WEATHER REPORTS TO THE LOCAL NATIONAL WEATHER SERVICE OFFICE.
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, 2 hours 28 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, 1 hour 36 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.
Local storm report, May 20, 7:04 PM CDT, 38 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE SAN ANTONIO TX
700 PM CDT WED MAY 20 1987
TIME EVENT
540 PM PEA SIZE HAIL AT DERBY...FRIO COUNTY
618 PM MARBLE SIZE HAIL IN DILLEY...FRIO COUNTY
619 PM MARBLE SIZE HAIL AT FAIRVIEW...WILSON COUNTY
625 PM PEA SIZE HAIL IN CHARLOTTE...ATASCOSA COUNTY
626 PM PEA SIZE HAIL AT LAKE CALAVARAS...BEXAR COUNTY
630 PM HAIL SIZE UNKNOWN...WESTERN WILSON COUNTY
635 PM S4 INCH DIAMETER HAIL AT DILLEY...FRIO COUNTY
647 PM PEA TO GOLF BALL SIZE HAIL SOUTHEAST OF LAKE CALAVARAS
...BEXAR COUNTYSpecial weather statement, May 20, 7:18 PM CDT, 24 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DEL RIO TX 718 PM CDT WED MAY 20 1987 AT 715 PM CDT AN AREA OF THUNDERSTORMS WAS DEVELOPING ABOUT 35 MILES WEST OF DEL RIO...BETWEEN COMSTOCK AND LANGTRY...AND WAS MOVING NORTHEAST INTO VAL VERDE COUNTY AT 15 MPH. AN ENTENSE THUNDERSTORM WITHIN THIS AREA WAS SOUTHEAST OF COMSTOCK AN JUST SOUTH OF THE RIO GRANDE RIVER. PERSONS LIVING BETWEEN BETWEEN COMSTOCK AND LANGTRY SHOULD BE PREPARED TO TAKE SAFETY PRECAUTIONS IF THIS STORM MOVES INTO THEIR VICINITY. BOATERS ON LAKE AMISTAD...RIO GRANDE...PECOS AND DEVILS RIVERS SHOULD BE AWARE OF THIS POTENTIAL DANGEROUS STORM AND CONSIDER MOVING TO A SAFE HARBOR. DANGEROUS CLOUD TO GROUND LIGHTNINhG HAS BEEN REPORTED OUT OF THESE THUNDERSTORMS. HEAVY RAIN...GUSTY WINDS...SMALL HAIL AND DANGEROUS LIGHTNING ARE QUITE LIKELY FROM THESE THUNDERSTORMS.
Special weather statement, May 20, 7:40 PM CDT, 2 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN TX 740 PM CDT WED MAY 20 1987 SEVERE THUNDERSTORM ACTIVITY CONTINUES IN AND AROUND THE CITY OF SAN ANTONIO SPREADING NORTH AND EASTWARD. THESE SEVERE THUNDERSTORMS ARE ONLY 50 TO 60 MILES SOUTHWEST OF AUSTIN ...BUT THEY ARE EXPECTED TO DIMINISHING IN INTENSITY AFTER SUNSET AS THEY APPROACH CALDWELL AND HAYS COUNTIES. RESIDENTS IN HAYS AND CALDWELL COUNTIES SHOULD STAY ALERT TO THE MOVMENT OF THESE STORMS FOR THE NEXT ONE TO TWO HOURS.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 20, 7:11 PM CDT | Severe Thunderstorm Warning | EWX | Wilson | 64 min |
| May 20, 7:38 PM CDT | Severe Thunderstorm Warning | EWX | Atascosa, Frio | 67 min |
| May 20, 8:34 PM CDT | Severe Thunderstorm Warning | EWX | Blanco, Hays | 56 min |
| May 20, 8:50 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 56 min |
| May 20, 8:56 PM CDT | Severe Thunderstorm Warning | EWX | Maverick | 64 min |
| May 20, 9:00 PM CDT | Tornado Warning | EWX | Uvalde, Zavala | 60 min |
| May 20, 9:03 PM CDT | Severe Thunderstorm Warning | EWX | Atascosa, Frio | 57 min |
| May 20, 9:27 PM CDT | Severe Thunderstorm Warning | EWX | Travis | 63 min |
| May 20, 9:27 PM CDT | Tornado Warning | EWX | Val Verde | 58 min |
| May 20, 9:47 PM CDT | Severe Thunderstorm Warning | EWX | Kinney | 58 min |
| May 20, 10:20 PM CDT | Severe Thunderstorm Warning | EWX | Val Verde | 60 min |
| May 20, 10:37 PM CDT | Severe Thunderstorm Warning | EWX | Edwards | 68 min |
| May 20, 10:42 PM CDT | Severe Thunderstorm Warning | EWX | Medina, Uvalde, Zavala | 63 min |
| May 20, 11:47 PM CDT | Severe Thunderstorm Warning | EWX | Medina, Uvalde, Zavala | 58 min |
| May 21, 1:00 AM CDT | Severe Thunderstorm Warning | EWX | Uvalde | 60 min |
| May 21, 6:17 AM CDT | Flash Flood Warning | EWX | Bexar | 3 hr |
| May 21, 6:23 PM CDT | Severe Thunderstorm Warning | EWX | Llano | 67 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.