A squall line was located across south central Oklahoma into north central Texas during the early afternoon hours of May, 11th. This line of storms propagated northeast and clipped extreme southeast Oklahoma in McCurtain County.
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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.
A squall line was located across south central Oklahoma into north central Texas during the early afternoon hours of May, 11th. This line of storms propagated northeast and clipped extreme southeast Oklahoma in McCurtain County. Damaging winds were the primary result across a portion of the county.
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 May 11, 1:44 PM CST, 2 hours 46 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 244 PM CDT WED MAY 11 2011 .DISCUSSION... MAIN FEATURE IN THE SHORT TERM IS A RAPIDLY DEVELOPED SQUALL LINE MOVING ACROSS THE DALLAS FORT WORTH METROPLEX...CONTAINING WIDESPREAD DAMAGING WIND REPORTS ADN VERY HEAVY RAIN. THIS GRID HAS BEEN EXPLICITY OUTLINED FOR THE EVENING HOURS...ACROSS MUCH OF PORTIONS OF NE TX...NORTH OF INTERSTATE 20...SE OK...AND A SMALL PART OF EXTREME ADJACENT SW AR. SLIGHTLY DRIER AIR OVERNIGHT COINCIDING WITH DUIRNAL MINIMUM FOR CONVECTION...SO EXPECT STORM ACTIVITY TO DIMINISH LATER TONIGHT. EXPECTING DUIRNAL DESTABILIZATION TO COME INTO PLAY ON THURSDAY... ALONG WITH OUTFLOW BOUNDARIES FROM THE WEST...REDEVELOPMENT ALONG DRYLINE...AND DIFFERENTIAL HEATING BOUNDARIES. HOWEVER...FOCUS FOR GREATEST OR STRONGEST ACTIVITY SEEMS DIFFUSE SO MORE OF A BROAD BRUSH FCST. FINALLY...COLD FRONT ARRIVES ON FRIDAY...STILL A BIT SLOWER WITH NAM SOLUTION. ONCE UPPER LOW MOVES TO THE NE...DRY SLOTTING WILL CLEAR OUT SKIES...WITH LITTLE IN WAY OF CLOUDS REMAINDER OF WKND. UPPER LOW MOVES INTO OHIO VALLEY. EARLY NEXT WEEK A SECONDARY UPPER LOW MOVES INTO NW FLOW BEHIND THIS LOW...DEEPENS...AND DIVES INTO SE STATES. THIS WILL PROVIDE A PROLONGED SHOT OF DEEP NW FLOW... AND UNSEASONALLY COOL TEMPS FOR REMAINDER OF EXTENDED PERIOD. && .PRELIMINARY POINT TEMPS/POPS... SHV 71 86 65 81 57 / 30 40 40 30 10 MLU 70 89 65 81 58 / 20 30 50 40 10 DEQ 67 82 60 75 51 / 60 40 40 30 20 TXK 69 83 63 78 53 / 40 40 40 30 20 ELD 69 86 62 79 55 / 30 40 50 40 20 TYR 72 84 64 77 54 / 40 40 30 20 10 GGG 71 85 63 79 55 / 30 40 30 20 10 LFK 72 87 66 82 57 / 30 40 40 30 10 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...NONE. LA...NONE. OK...NONE. TX...NONE. &&
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 515 PM CDT WED MAY 11 2011 ARZ072-073-LAZ001>006-010>014-017>022-TXZ138-149>153-165>167- 121100- 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-HARRISON-CHEROKEE-RUSK- PANOLA-NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-SABINE TX- 515 PM CDT WED MAY 11 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA... NORTHWEST LOUISIANA...EAST TEXAS AND NORTHEAST TEXAS. .DAY ONE...TONIGHT... SHOWERS AND THUNDERSTORMS MAY AFFECT PORTIONS OF THE AREA LATE TONIGHT. HOWEVER...THROUGH DAYBREAK...ORGANIZED SEVERE WEATHER IS NOT ANTICIPATED. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY... THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF THE AREA ON THURSDAY AND FRIDAY AS A LARGE UPPER LEVEL DISTURBANCE SLOWLY MOVES ACROSS THE SOUTHERN PLAINS AND A DRYLINE AND COLD FRONT APPROACH FROM THE WEST. SOME STORMS MAY BECOME STRONG TO SEVERE WITH LARGE HAIL AND DAMAGING WINDS BEING THE PRIMARY THREATS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED TONIGHT. ARZ050-051-059>061-070-071-OKZ077-TXZ096-097-108>112-124>126-136- 137-121100- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- MCCURTAIN-RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD- UPSHUR-MARION-SMITH-GREGG- 515 PM CDT WED MAY 11 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST ARKANSAS...SOUTHEAST OKLAHOMA AND NORTHEAST TEXAS. .DAY ONE...TONIGHT... SHOWERS AND THUNDERSTORMS WILL DEVELOP ALONG A DRYLINE LOCATED IN CENTRAL TEXAS. THESE THUNDERSTORMS ARE EXPECTED TO MOVE EAST INTO PORTIONS OF NORTHEAST TEXAS...SOUTHEAST OKLAHOMA AND SOUTHWEST ARKANSAS TONIGHT. SOME OF THESE STORMS MAY BECOME SEVERE WITH DAMAGING WINDS AND LARGE HAIL BEING THE PRIMARY THREATS. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY... THUNDERSTORMS ARE EXPECTED ACROSS MUCH OF THE AREA ON THURSDAY AND FRIDAY AS A LARGE UPPER LEVEL DISTURBANCE SLOWLY MOVES ACROSS THE SOUTHERN PLAINS AND A DRYLINE AND COLD FRONT APPROACH FROM THE WEST. SOME STORMS MAY BECOME STRONG TO SEVERE WITH LARGE HAIL AND DAMAGING WINDS BEING THE PRIMARY THREATS. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED TONIGHT. 09
The Western Arkansas radar (KSRX), 135 km away, was scanning. The volume nearest the first event began at 22:31 UTC.
1 thunderstorm wind. Local standard time, as filed.
A tree was downed across a road in Beavers Bend State Park.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Oklahoma in 2011Every state in 2011This day in weather historyWarnings in Oklahoma, May 2011
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: 297679.