Alert archive / Texas / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 76, NWS Austin/San Antonio, TX
NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 18, 1987, 7:35 PM CDT for Val Verde County, Texas. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- May 18, 1987, 7:35 PM CDT (00:35 UTC)
- Expired
- May 18, 1987, 8:35 PM CDT
- In force
- 60 min
- Issued by
- NWS Austin/San Antonio, TX
- Area
- Whole counties
County Val Verde 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, 0.6 hours before the alert went out and 66 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
- 3088 J/kg
- Mixed-layer CIN
- -3 J/kg
- Mixed-layer LCL
- 821 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 48 m²/s²
- 0-3 km storm-relative helicity
- 85 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 2.9
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
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 18, 3:16 PM CDT, 4 hours 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DEL RIO TX 316 PM CDT MON MAY 18 1987 AT 305 PM CDT RADAR INDICATED THUNDERSTORMS AND RAINSHOWERS FROM 35 MILES SOUTHWEST OF DEL RIO IN OLD MEXICO TO 20 MILES NORTHWEST AND EXTENDED NORTHEAST TO SOUTH OF SONORA. THE STRONGEST STORM WAS ALONG THE RIO GRANDE RIVER 20 MILES NORTHWEST OF DEL RIO. THESE STORMS WERE MOVING TO THE NORTH AT 15 MPH. HEAVY RAIN...SMALL HAIL...FREQUENT DANGEROUS LIGHTNING qAND STRONG GUSTY WINDS ARE POSSIBLE WITH THESE STORMS. BOATERS ON LAKE AMISTAD AND THE RIO GRANDE RIVER SHOULD BE AWARE THAT NOT ONLY STRONG GUSTY WINDS BUT ALSO LIGHTNING POSES A THREAT TO SAFETY.
Special weather statement, May 18, 3:44 PM CDT, 3 hours 51 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN ANTONIO TX 340 PM CDT MON MAY 18 1987 NATIONAL WEATHER SERVICE RADAR AT HONDO, TEXAS WAS INDICATING SHOWERS AND THUNDERSTORMS DEVELOPING FROM SOUTHWEST TO WEST OF DEL RIO...ACROSS VAL VERDE COUNTY...NORTHWEST EDWARDS COUNTY...NORTHWEST OF ROCKSPRINGS INTO THE HILL COUNTRY...WEST AND NORTHWEST OF JUNCTION. OTHER ISOLATED SHOWERS WERE BEGINNING TO DEVELOP OVER OTHER SECTIONS OF SOUTH CENTRAL TEXAS. THE SHOWERS AND THUNDERSTORMS WERE MOVING TO THE NORTH AT 15 MPH.
Special weather statement, May 18, 5:08 PM CDT, 2 hours 27 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE AUSTIN TX 510 PM CDT MON MAY 18 1987 AT 505 PM AUSTIN WEATHER RADAR INDICATED THUNDERSTORMS OVER MILLS AND SAN SABA COUNTIES. THESE THUNDERSTORMS ARE MOVING VERY SLOWLY TO THE NORTHEAST. RAINFALL RATES FROM THESE STORMS ARE INTENSE.. 1 TO 2 INCHES PER HOUR. WITH THE SLOW MOVEMENT OF THESE THUNDERSTORMS..LOCALLY HEAVY RAIN.. SMALL HAIL AND DANGEROUS LIGHTNING IS OCCURRING. SOME FLOODING MAY BE OCCURRING ON ROADWAYS AND SMALL STREAMS.
Special weather statement, May 18, 5:12 PM CDT, 2 hours 23 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DEL RIO TX 512 PM CDT MON MAY 18 1987 AT 500 PM CDT VERY STRONG THUNDERSTORMS REMAIN IN THE COMSTOCK AREA AND EXTENDED NORTHEAST TO SONORA. OTHER THUNDERSTORMS AND RAINSHOWERS WERE DEVELOPING 10 MILES SOUTHEAST TO 10 MILES SOUTH OF DEL RIO. THE STRONGEST STORM REMAINED NEAR COMSTOCK. THESE STORMS WERE MOVING TO THE NORTH AT 15 MPH. HEAVY RAIN HAS BEEN REPORTED AT COMSTOCK. SINCE THESE STORMS CONTINUE TO DEVELOP IN THE SAME AREA AROUND COMSTOCK FLOODING OF LOW WATER CROSSINGS AND SMALL STREAMS IS LIKELY. HEAVY RAIN...SMALL HAIL...FREQUENT DANGEROUS LIGHTNING AND STRONG GUSTY WINDS ARE POSSIBLE WITH THESE STORMS. BOATERS ON LAKE AMISTAD AND THE SURROUNDING RIVERS SHOULD CONTINE TO REMAIN ALERT AND PLAN TO SEEK SAFE HARBOR IF CONDITIONS WORSEN.
Special weather statement, May 18, 6:24 PM CDT, 1 hour 11 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DEL RIO TX 625 PM CDT MON MAY 18 1987 ...INTENSE THUNDERSTORMS OBSERVED IN THE DEL RIO AREA... AT 620 PM CDT INTENSE THUNDERSTORMS WITH RAINSHOWERS...>GUSTY WINDS AND FREQUENT DANGEROUS LIGHTNING WERE OBSERVED AT THE DEL RIO INTERNATIONAL AIRPORT. FLOODING OF LOW WATER CROSSINGS AND LOW LYING AREAS IN DEL RIO IS LIKELY AS THESE STORMS PASS THROUGH THE AREA.
Special weather statement, May 18, 6:55 PM CDT, 40 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SAN ANTONIO TX 655 PM CDT MON MAY 18 1987 ...STRONG THUNDERSTORM NEAR EAGLE PASS TEXAS... A STRONG THUNDERSTORM HAS MOVED OUT OF MEXICO AND IS LOCATED NEAR EAGLE PASS TEXAS. THIS THUNDERSTORM CONTAINS VERY HEAVY RAIN...SMALL HAIL AND GUSTY WINDS. THE THUNDERSTORM IS MOVING NORTH ABOUT 15 MPH AND SHOULD BE OUT OF THE CITY IN ABOUT ONE HALF HOUR. OTHER THUNDERSTORMS CONTINUE TO FOhRM OVER MEXICO AND ARE MOVING EAST TOWARDS TEXAS.
The office that day
Everything else NWS Austin/San Antonio, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 7:19 PM CDT | Severe Thunderstorm Warning | EWX | Maverick | 56 min |
| May 18, 9:13 PM CDT | Severe Thunderstorm Warning | EWX | Real | 62 min |
| May 19, 10:58 AM CDT | Flash Flood Warning | EWX | Kendall | 2 hr |
| May 19, 3:15 PM CDT | Severe Thunderstorm Warning | EWX | Bexar | 60 min |
| May 19, 4:14 PM CDT | Severe Thunderstorm Warning | EWX | Bexar | 61 min |
| May 19, 4:23 PM CDT | Severe Thunderstorm Warning | EWX | Hays, Travis | 67 min |
| May 19, 5:03 PM CDT | Tornado Warning | EWX | Guadalupe | 57 min |
| May 19, 6:06 PM CDT | Severe Thunderstorm Warning | EWX | Bexar, Wilson | 54 min |
| May 19, 6:29 PM CDT | Severe Thunderstorm Warning | EWX | Travis | 61 min |
| May 19, 6:39 PM CDT | Tornado Warning | EWX | Wilson | 66 min |
| May 19, 6:59 PM CDT | Severe Thunderstorm Warning | EWX | Bexar | 61 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; the sounding from the Mesonet's radiosonde archive.