Alert archive / Texas / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 13, NWS Houston/Galveston, TX
NWS Houston/Galveston, TX issued this severe thunderstorm warning at Apr 13, 1987, 12:50 PM CDT for Polk County, San Jacinto County, Trinity County, Texas. It was in force for 55 min.
The area
The counties it named.
The facts
- Issued
- Apr 13, 1987, 12:50 PM CDT (17:50 UTC)
- Expired
- Apr 13, 1987, 1:45 PM CDT
- In force
- 55 min
- Issued by
- NWS Houston/Galveston, TX
- Area
- Whole counties
Counties Polk County, TX, San Jacinto County, TX, Trinity 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
Longview/Gregg, TX (KGGG), launched 12:00Z, 5.8 hours before the alert went out and 175 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
- 1954 J/kg
- Mixed-layer CIN
- -139 J/kg
- Mixed-layer LCL
- 590 m above ground
- 0-6 km bulk shear
- 30 kt
- 0-1 km storm-relative helicity
- 154 m²/s²
- 0-3 km storm-relative helicity
- 152 m²/s²
- Significant tornado parameter
- 0.4
- Supercell composite
- 1.8
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KHOU 131750
SVRHOU
TXC455-373-407-131845-
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE HOUSTON TX
1250 PM CDT MON APR 13 1987
THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM WARNING
EFFECTIVE UNTIL 145 PM CDT FOR PEOPLE IN THE FOLLOWING COUNTIES...
IN NORTHEAST TEXAS
...TRINITY
IN SOUTHEAST TEXAS
...NORTHERN POLK...NORTHERN SAN JACINTO
WEATHER SERVICE RADAR INDICATED A CLUSTER OF POSSIBLY SEVERE
THUNDERSTORMS NEAR THE NORTHERN PART OF LAKE LIVINGSTON...MOVING
NORTHEAST AT 40 MPH.
REMEMBER SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES WITH LITTLE OR NO ADVANCE WARNING. REMAIN CALM BUT BE
ALERT TO RAPIDLY CHANGING WEATHER CONDITIONS.
THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH YOU SHOULD
PREPARE FOR DAMAGING WIND IN EXCESS OF 55 MPH...LARGE HAIL...AND
DEADLY LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER...
PREFERABLYa INSIDE A STRONG BUILDING BUT STAY AWAY FROM WINDOWS.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, Apr 13, 8:08 AM CDT, 4 hours 42 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HOUSTON TX 810 AM CDT MON APR 13 1987 A TORNADO WATCH HAS BEEN ISSUED FROM NEAR COLLEGE STATION TO NEAR TEXARKANA AND INCLUDES THE FOLLOWING COUNTIES IN EAST AND SOUTHEAST TEXAS...HOUSTON...TRINITY...GRIMES...WALKER...SAN JACINTO...POLK AND MONTGOMERY. THE WATCH IS IN EFFECT FROM 800 AM UNTIL 200 PM CDT. THUNDERSTORMS WERE SCATTERED BETWEEN SAN ANTONIO AND WACO AND WILL BE MOVING INTO THE WATCH AREA IN THE NEXT TWO OR THREE HOURS. STAY TUNED FOR LATER STATEMENTS OR WARNINGS AS NEEDED.
Special weather statement, Apr 13, 9:31 AM CDT, 3 hours 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HOUSTON TX 930 AM CDT MON APR 13 1987 A TORNADO WATCH REMAINS IN EFFECT FROM NEAR COLLEGE STATION TO NEAR TEXARKANA AND INCLUDES THE FOLLOWING COUNTIES IN EAST AND SOUTHEAST TEXAS...HOUSTON...TRINITY...GRIMES...WALKER...SAN JACINTO...POLK AND MONTGOMERY. THE WATCH IS IN EFFECT UNTIL 200 PM THIS AFTERNOON. A LINE OF THUNDERSTORMS STRETCHED FROM EAST OF WACO TO NEAR COLLEGE STATION TO JUST EAST OF AUSTIN. THE LINE IS MOVING EAST AT ABOUT 40 MPH. BOATERS ON LAKE SOMERVILLE SHOULD MOVE TO SHORE UNTIL THESE STORMS PASS. STAY TUNED FOR LATER STATEMENTS OR WARNINGS AS NEEDED.
Special weather statement, Apr 13, 12:05 PM CDT, 45 minutes before
SPEACIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HOUSTON TX 1206 PM CDT MON APR 13 1987 A TORNADO WATCH REMAINS IN EFFECT FROM NEAR COLLEGE STATION TO NEAR TEXARKANA AND INCLUDES THE FOLLOWING COUNTIES IN EAST AND SOUTHEAST TEXAS...HOUSTON...TRINITY...GRIMES...WALKER...SAN JACINTO...POLK AND MONTGOMERY. THE WATCH IS IN EFFECT UNTIL 200 PM THIS AFTERNOON. AT 12 NOON....RADAR SHOWS A LINE OF THUNDERSTORMS MOVING INTO SOUTHEAST TEXAS...EXTENDING FROM NEAR LUFKIN ACROSS THE NORTHERN PORTION OF LAKE LIVINGSTON...TO HEMPSTEAD...TO JUST WEST OF EAGLE LAKE....MOVING EAST TO SOUTHEAST AT 30 MPH. ONE OF THE STORNGEST STORMS IN THE LINE WAS BETWEEN MONTGOMERY AND HUNSTVILLE...MOVING EAST AT ABOUT 40 MPH. OTHER THUNDERSORMS IN THE LINE WERE OF CONSIDERABLY LESS INTENSITY AND APPARANTLY WELL BELOW SEVERE LEVEL CATAGORIES AT THE MOMENT. HOWEVER...INTENSITIES COULD INCREASE QUICKLY AT ANY TIME AS THE LINE MOVES DEEPER INTO SOUTHEAST TEXA6S. SOME OF THE THUNDERSTORMS IN THE LINE WILL BE MOVING TO NEAR THE HOUSTON AREA BETWEEN 1 AND 2 PM. STAY TUNED TO YOUR WEATHER RADIO..LOCAL RADIO AND TV...FOR THE LATEST STATEMENTS AND POSSIBLE WARNINGS AS CONDITIONS WARRANT.
Special weather statement, Apr 13, 12:27 PM CDT, 23 minutes before
SPEACIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE HOUSTON TX 1228 PM CDT MON APR 13 1987 ..A TORNADO WATCH REMAINS IN EFFECT FROM NEAR COLLEGE STATION TO NEAR TEXARKANA AND INCLUDES THE FOLLOWING COUNTIES IN EAST AND SOUTHEAST TEXAS...HOUSTON...TRINITY...GRIMES...WALKER...SAN JACINTO...POLK AND MONTGOMERY. THE WATCH IS IN EFFECT UNTIL 200 PM THIS AFTERNOON... AT 1225 PM...RADAR SHOWS A CLUSTER OF STRONG THUNDERSTORMS FROM THE NORTHERN END OF LAKE LIVINGSTON...TO JUST EAST OF HUNTSVILLE..TO NEAR MONTGOMERY. THESE STORMS WERE PART OF A LINE OF THUNDERSTORMS THAT WERE MOVING EAST AT 30 MPH. SOME OF THESE STORMS WILL LIKELY PRODUCE STRONG GUSTY WINDS AND COULD HAVE SMALL HAIL AS THEY MONVE THROUGH MONTGOMERY...WALKER...AND SAN JACINTO COUNTIES DURING THE NEXT HOUR. SMALL CRAFT OPERATORS ON LAKE LIVINGSTON SHOULD HEAD FOR SAFE HARBOUR IMMEDIATELY.
The office that day
Everything else NWS Houston/Galveston, TX issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 13, 10:05 AM CDT | Severe Thunderstorm Warning | HGX | Grimes, Walker | 40 min |
| Apr 13, 10:27 AM CDT | Severe Thunderstorm Warning | HGX | Houston, Trinity | 63 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.