Isolated pulse type severe thunderstorms developed across Harrison County in Northeast Texas during the afternoon hours of August 15th. These storms developed in a moist and unstable airmass and produced strong downburst winds once they collapsed.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SHV wrote it up.
Isolated pulse type severe thunderstorms developed across Harrison County in Northeast Texas during the afternoon hours of August 15th. These storms developed in a moist and unstable airmass and produced strong downburst winds once they collapsed.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Shreveport, LA wrote its last area forecast discussion before the first event at Aug 15, 11:47 AM CST, 2 hours 4 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 1247 PM CDT WED AUG 15 2012 .UPDATE... I HAD TO DO A QUICK AND LATE UPDATE OF THE AFTERNOON TEMPS...AS CLOUD COVER WILL INHIBIT TEMPS FROM WARMING INTO THE MID 90S GENERALLY ALONG AND NORTH OF I20. ELEVEN && .PRELIMINARY POINT TEMPS/POPS... SHV 92 75 96 75 94 / 40 20 20 20 50 MLU 93 74 94 73 93 / 40 20 20 20 50 DEQ 89 71 95 71 90 / 30 20 20 30 50 TXK 90 73 95 74 92 / 40 20 20 30 50 ELD 90 72 94 72 92 / 40 20 20 30 50 TYR 94 76 98 75 94 / 40 20 20 20 40 GGG 93 75 97 75 94 / 40 20 20 20 40 LFK 97 76 97 75 96 / 20 20 20 10 30 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...NONE. LA...NONE. OK...NONE. TX...NONE. && 11
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1135 AM CDT WED AUG 15 2012 ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077- TXZ096-097-108>112-124>126-136>138-149>153-165>167-161200- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN- UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA- NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE- FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG- HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA- SAN AUGUSTINE-SABINE TX- 1135 AM CDT WED AUG 15 2012 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA... NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA...EAST TEXAS AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... WIDELY SCATTERED TO SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON...AS UPPER LEVEL DISTURBANCES PASS ACROSS THE AREA NEAR THE FRONT DURING PEAK HEATING. ISOLATED STRONG THUNDERSTORMS CAN NOT BE RULED OUT THIS AFTERNOON...WITH GUSTY WINDS AND BRIEF HEAVY RAIN POSSIBLE. ANY SHOWERS AND THUNDERSTORMS THAT DEVELOP THIS AFTERNOON SHOULD DIMINISH THIS EVENING WITH THE LOSS OF DAYTIME HEATING. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY... SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ACROSS MUCH OF THE REGION FRIDAY AND SATURDAY...AHEAD OF A WEAK FRONTAL SYSTEM AND ASSOCIATED UPPER LEVEL DISTURBANCE THAT WILL SLOWLY MOVE SOUTH ACROSS THE SOUTHERN PLAINS AND LOWER MISSISSIPPI VALLEY. ENOUGH HEATING AND INSTABILITY MAY BE PRESENT AHEAD OF THE FRONT TO YIELD AN ISOLATED THREAT OF SEVERE THUNDERSTORMS OVER THE REGION FRIDAY AFTERNOON AND EVENING...WITH THE THREAT FOR DAMAGING WINDS AND MARGINALLY SEVERE HAIL. THIS THREAT MAY CARRY OVER INTO SATURDAY AFTERNOON AND EVENING AS WELL...ALTHOUGH HEATING AND INSTABILITY WILL BE LIMITED DUE TO INCREASED CLOUD COVER AND RAIN. THESE SHOWERS AND THUNDERSTORMS SHOULD GRADUALLY DIMINISH FROM NORTH TO SOUTH SUNDAY...AS DRIER AIR FILTERS SOUTH BEHIND THE FRONT. .SPOTTER INFORMATION STATEMENT... THE ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND AMATEUR RADIO PERSONNEL...SHOULD NOT BE NEEDED THIS AFTERNOON OR TONIGHT. ELEVEN
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
232 PM CDT WED AUG 15 2012
TXZ138-152030-
HARRISON-
232 PM CDT WED AUG 15 2012
...SIGNIFICANT WEATHER ADVISORY...
THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 330 PM CDT...FOR THE FOLLOWING
COUNTY...
IN NORTHEAST TEXAS...
HARRISON...
INCLUDING THE FOLLOWING LOCATIONS...
HALLSVILLE...HARLETON...KARNACK...MARSHALL...WASKOM AND
WOODLAWN...
AT 230 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM NEAR MARSHALL...MOVING EAST AT 10
MPH.
WINDS AROUND 40 MPH ARE EXPECTED WITH THIS STORM.
05The national radar mosaic for the moment the first event began.
1 thunderstorm wind. Local standard time, as filed.
Trees and powerlines were downed at East Texas Baptist University in Marshall, Texas.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2012Every state in 2012This day in weather historyWarnings in Texas, August 2012
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 400009.