Hail, McClain
- When
- August 11, 8:25 AM CST
- Where
- McClain County, Blanchard
- Measured
- 1 in hail
- Reported by
- Law Enforcement
- Coordinates
- 35.140, -97.660
Hail and Damaging Wind in Oklahoma, August 11, 2011
Thunderstorms developed along and north of Interstate 40, and additional storms moved into western Oklahoma from the Texas panhandle. The storms produced some marginally severe hail and wind gusts.
Where it happened
Every event with a place to put it. Tap one for its entry below.
- Tornadoes
- Tropical storms and surge
- Floods
- Wind
- Hail
- Winter weather
- Heat and drought
- Cold
- Fire, smoke and dust
- Marine and coastal
- Other
The toll
- Deaths
- 0
- Injuries
- 0
- Property damage
- None recorded
- Crop damage
- None recorded
- Events
- 4
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.
What happened
The episode as NWS OUN wrote it up.
Thunderstorms developed along and north of Interstate 40, and additional storms moved into western Oklahoma from the Texas panhandle. The storms produced some marginally severe hail and wind gusts.
What forecasters said that day
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 Norman, OK wrote its last area forecast discussion before the first event at Aug 11, 6:00 AM CST, 2 hours 25 minutes earlier.
Area forecast discussion, Aug 11, 6:00 AM CST, 2 hours 25 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NORMAN OK 700 AM CDT THU AUG 11 2011 .AVIATION... /12Z TAFS/ WITH MULTIPLE TSTM OUTFLOWS... WIND FORECASTS ARE HIGHLY UNCERTAIN THROUGH TODAY. THUNDERSTORMS MAY AFFECT ANY TERMINAL NORTH OF INTERSTATE 40 THROUGH THE MORNING... WITH STORMS EXPECTED TO WEAKEN WITH TIME. STRONG WIND GUSTS... VISIBILITY REDUCTIONS... AND LIGHTNING WILL ALL BE POSSIBLE. STORMS MAY DEVELOP ALONG A SURFACE FRONT NEAR THE RED RIVER THIS AFTERNOON AFFECTING KLAW AND KSPS... WITH ANOTHER STORM COMPLEX POTENTIALLY FORMING IN WEST TX AFFECTING LAW AND SPS OVERNIGHT. && .PREV DISCUSSION... /ISSUED 353 AM CDT THU AUG 11 2011/ DISCUSSION... A BUSY MORNING IS UNDERWAY. CONVECTION BEGAN DEVELOPING OVER THE TX/OK PANHANDLES JUST AFTER MIDNIGHT... AND SHOWERS/STORMS ARE NOW FORMING EASTWARD ACROSS CENTRAL OK APPROXIMATELY ALONG THE INTERSTATE 40 CORRIDOR. A LOW LEVEL JET IS LIKELY INTERACTING WITH AN ELEVATED FRONTAL BOUNDARY... WITH THE ASSOCIATED SURFACE BOUNDARY NEAR THE RED RIVER. A FEW STRONG TO SEVERE WIND GUSTS... ALONG WITH SOME LARGE HAIL... COULD OCCUR. WITH SOME UNCERTAINTY REGARDING HOW LONG STORMS WILL PERSIST INTO THE MORNING... POPS ARE IN THE CHANCE TO LIKELY CATEGORIES... THOUGH UPDATES CAN BE EXPECTED. ADDITIONALLY... DEPENDING ON CONVECTIVE EVOLUTION... PART OR ALL OF THE HEAT ADVISORY ACROSS SOUTHERN OK AND WESTERN NORTH TX MAY BE EVENTUALLY REMOVED EARLY. THE NAM AND GFS BOTH POINT TO THE FORMATION OF A TSTM CLUSTER NEAR THE SURFACE FRONTAL BOUNDARY OVER WEST TX THIS AFTERNOON/EVENING... MOVING INTO SOUTHWEST PORTIONS OF THE CWA THIS EVENING/TONIGHT. ALONG WITH SOME MUCH NEEDED RAIN... SUCH A STORM COMPLEX WOULD LIKELY BRING WITH IT THE THREAT OF DAMAGING WIND GUSTS. FRIDAY... THE SURFACE FRONTAL BOUNDARY WILL RETURN NORTH SOME AS A MID LEVEL TROUGH MOVES INTO THE NORTHERN PLAINS. THE TROUGH WILL MOVE SOUTHEAST INTO THE GREAT LAKES AREA ON SATURDAY... DRIVING THE BAROCLINIC ZONE WHICH HAS BEEN IN THE AREA FOR SOME TIME BACK SOUTHWARD. MED RANGE MODELS POINT TO THE POSSIBILITY OF ANOTHER STORM COMPLEX FRIDAY NIGHT... MOST LIKELY AFFECTING THE EASTERN HALF OF THE CWA. EVEN SOUTHERN PORTIONS OF THE CWA MAY SEE A COOL DOWN THIS WEEKEND... SO WE WILL NOT EXTEND THE HEAT ADVISORY. MED RANGE MODELS SUGGEST THE RETURN OF THE MID LEVEL RIDGE CENTER TO THE SOUTHERN PLAINS EARLY NEXT WEEK... BRINGING VERY WARM TO HOT TEMPERATURES BACK TO THE CWA. A FRONTAL BOUNDARY MAY BEGIN TO AFFECT THE AREA MID WEEK. && .PRELIMINARY POINT TEMPS/POPS... OKLAHOMA CITY OK 93 75 99 75 / 40 20 20 40 HOBART OK 99 74 100 73 / 40 30 20 30 WICHITA FALLS TX 107 79 104 76 / 30 20 10 20 GAGE OK 87 71 98 68 / 60 20 20 30 PONCA CITY OK 88 72 97 73 / 40 20 30 60 DURANT OK 103 78 99 76 / 20 10 10 30 && .OUN WATCHES/WARNINGS/ADVISORIES... OK...HEAT ADVISORY UNTIL 10 PM CDT FRIDAY FOR OKZ033>048-050>052. TX...HEAT ADVISORY UNTIL 10 PM CDT FRIDAY FOR TXZ083>090. && 11/03/03 TAYLOR
Hazardous weather outlook, Aug 11, 3:20 AM CST, 5 hours 5 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
420 AM CDT THU AUG 11 2011
OKZ004>048-050>052-TXZ083>090-111700-
HARPER-WOODS-ALFALFA-GRANT-KAY-ELLIS-WOODWARD-MAJOR-GARFIELD-NOBLE-
ROGER MILLS-DEWEY-CUSTER-BLAINE-KINGFISHER-LOGAN-PAYNE-BECKHAM-
WASHITA-CADDO-CANADIAN-OKLAHOMA-LINCOLN-GRADY-MCCLAIN-CLEVELAND-
POTTAWATOMIE-SEMINOLE-HUGHES-HARMON-GREER-KIOWA-JACKSON-TILLMAN-
COMANCHE-STEPHENS-GARVIN-MURRAY-PONTOTOC-COAL-COTTON-JEFFERSON-
CARTER-JOHNSTON-ATOKA-LOVE-MARSHALL-BRYAN-HARDEMAN-FOARD-WILBARGER-
WICHITA-KNOX-BAYLOR-ARCHER-CLAY-
420 AM CDT THU AUG 11 2011
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...TODAY AND TONIGHT...
THUNDERSTORM OUTLOOK...
THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS MOST OF
OKLAHOMA AND PARTS OF WESTERN NORTH TEXAS.
LOCATION...
THE RISK AREA COVERS LOCATIONS NORTH OF A LINE EXTENDING FROM ARCHER
CITY AND HENRIETTA TEXAS...TO ARDMORE AND COALGATE.
TIMING...
THE PRIMARY RISK FOR SEVERE WEATHER ACROSS NORTHERN AND CENTRAL
OKLAHOMA WILL BE THIS MORNING AND EARLY AFTERNOON...WHILE THE THREAT
SHIFTS INTO SOUTHERN OKLAHOMA AND WESTERN NORTH TEXAS LATE THIS
AFTERNOON THROUGH TONIGHT.
IMPACTS...
DAMAGING WINDS 60 TO 70 MPH AND HAIL TO THE SIZE OF GOLFBALLS. THERE
WILL BE A RISK FOR EVEN STRONGER WIND GUSTS ACROSS WESTERN NORTH
TEXAS THIS EVENING AND TONIGHT IF A STORM COMPLEX CAN FORM OVER WEST
TEXAS AND MOVE EAST.
RECOMMENDED ACTIONS...
STORM SPOTTER GROUPS AND EMERGENCY MANAGEMENT PERSONNEL IN AND NEAR
THE RISK AREA SHOULD BE PREPARED FOR SEVERE WEATHER OPERATIONS.
DISCUSSION...
SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS ARE EXPECTED TO
DEVELOP ACROSS NORTHERN AND CENTRAL OKLAHOMA THIS MORNING AS A
LOW-LEVEL JET INTERACTS WITH STEEP LAPSE RATES NORTH OF A FRONTAL
BOUNDARY. ADDITIONAL THUNDERSTORMS OVER THE PANHANDLES AND SOUTHWEST
KANSAS ARE ALSO EXPECTED TO MOVE INTO THE BODY OF OKLAHOMA THIS
MORNING. THE PRIMARY CONCERNS THROUGH NOON WILL BE LARGE HAIL...UP
TO THE SIZE OF GOLFBALLS...ALONG WITH WIND GUSTS AROUND 60 MPH.
LATER TODAY...SHOWERS AND THUNDERSTORMS WILL TRY TO DEVELOP NEAR THE
MENTIONED FRONTAL BOUNDARY...WHICH WILL BE LOCATED ACROSS FAR
NORTHERN TEXAS OR SOUTHERN OKLAHOMA. ANY STORMS THAT DEVELOP WILL
LIKELY BECOME SEVERE WITH AMPLE SHEAR AND INSTABILITY. A MORE LIKELY
SCENARIO WILL BE A THUNDERSTORM COMPLEX FORMING ACROSS THE SOUTHERN
TEXAS PANHANDLE...OR FAR WEST TEXAS...NEAR THE FRONT. IF THIS
COMPLEX BECOMES STRONG ENOUGH...IT COULD MOVE INTO FAR SOUTHWEST
OKLAHOMA AND WESTERN NORTH TEXAS LATE TODAY AND TONIGHT...AND
PRODUCE VERY DAMAGING WIND GUSTS.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT FRIDAY AUG 12.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...40 PERCENT.
OTHER HAZARDOUS WEATHER...
THE HOT AIRMASS IS EXPECTED TO PERSIST ACROSS FAR SOUTHERN OKLAHOMA
AND WESTERN NORTH TEXAS. A HEAT ADVISORY REMAINS IN EFFECT.
DRY VEGETATION WILL KEEP WILDFIRE POTENTIAL HIGH...ESPECIALLY IN
LOCATIONS THAT HAVE NOT RECEIVE SIGNIFICANT RAIN IN RECENT DAYS.
.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...
THUNDERSTORM OUTLOOK...
LOW TO MODERATE THUNDERSTORM CHANCES WILL PERSIST INTO THE
WEEKEND...WITH THE POSSIBILITY OF STORMS DEVELOPING NEAR ANY OUTFLOW
BOUNDARIES OR FRONTS. ADDITIONAL STORMS DEVELOPING OVER THE HIGH
PLAINS COULD ALSO APPROACH THE AREA DURING THE OVERNIGHT HOURS. THE
GREATEST CHANCES FOR WIDESPREAD RAIN WILL BE FRIDAY NIGHT THROUGH
THE FIRST PART OF SATURDAY.
OTHER HAZARDOUS WEATHER...
DRY VEGETATION WILL KEEP WILDFIRE POTENTIAL HIGH IN LOCATIONS THAT
DO NOT RECEIVE SIGNIFICANT RAIN.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED AT NOON
BUT BE PREPARED FOR OCCASIONAL UPDATES THROUGHOUT THE DAY.In the hours before
Special weather statement, Aug 11, 7:01 AM CST, 1 hour 24 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
801 AM CDT THU AUG 11 2011
OKZ021-022-033>035-111330-
GREER OK-HARMON OK-KIOWA OK-WASHITA OK-BECKHAM OK-
801 AM CDT THU AUG 11 2011
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...GREER...HARMON...
KIOWA AND WASHITA COUNTIES.
AT 800 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 6
MILES NORTHWEST OF CARTER TO 3 MILES WEST OF TEXOLA...MOVING
SOUTHEAST AT 30 MPH. VERY STRONG WIND GUSTS COULD SPREAD WELL TO THE
SOUTHEAST OF THE STORMS... TOWARD HOLLIS... MANGUM... HOBART... AND
ELK CITY.
HAZARDS INCLUDE...
WIND GUSTS TO 50 MPH...
OCCASIONAL CLOUD TO GROUND LIGHTNING...
MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.
LAT...LON 3519 9989 3534 9953 3509 9910 3488 9951
3494 9994 3504 10001 3523 10001Special weather statement, Aug 11, 7:30 AM CST, 55 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 830 AM CDT THU AUG 11 2011 OKZ024-111400- CANADIAN OK- 830 AM CDT THU AUG 11 2011 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR CANADIAN COUNTY. AT 830 AM CDT...A LARGE STRONG THUNDERSTORM WAS LOCATED OVER MUCH OF CANADIAN COUNTY...MOVING EAST AT 30 MPH. HAZARDS INCLUDE... HAIL UP TO ONE-HALF INCH... WIND GUSTS TO 40 MPH... FREQUENT CLOUD TO GROUND LIGHTNING... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. LAT...LON 3573 9768 3539 9768 3543 9822 3570 9818 30
Special weather statement, Aug 11, 7:32 AM CST, 53 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 832 AM CDT THU AUG 11 2011 OKZ021-022-034-035-111400- GREER OK-KIOWA OK-WASHITA OK-BECKHAM OK- 832 AM CDT THU AUG 11 2011 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR BECKHAM...GREER...KIOWA AND WASHITA COUNTIES. AT 832 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 6 MILES NORTHEAST OF BURNS FLAT TO 11 MILES SOUTHWEST OF DELHI...MOVING EAST AT 35 MPH. HAZARDS INCLUDE... WIND GUSTS TO 40 MPH... FREQUENT CLOUD TO GROUND LIGHTNING... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. LAT...LON 3544 9950 3545 9877 3500 9910 3502 9989 30
Special weather statement, Aug 11, 7:34 AM CST, 51 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
834 AM CDT THU AUG 11 2011
OKZ012-013-018>020-111400-
GARFIELD OK-KINGFISHER OK-LOGAN OK-NOBLE OK-PAYNE OK-
834 AM CDT THU AUG 11 2011
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR GARFIELD...KINGFISHER...
LOGAN...NOBLE AND PAYNE COUNTIES.
AT 835 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 6
MILES WEST OF MORRISON TO 3 MILES SOUTHWEST OF CIMARRON CITY...MOVING
EAST AT 35 MPH.
HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...
WIND GUSTS TO 40 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.
LAT...LON 3634 9702 3634 9693 3633 9692 3626 9692
3625 9687 3624 9686 3611 9694 3584 9730
3585 9782 3622 9778 3635 9743 3636 9703
30Special weather statement, Aug 11, 7:52 AM CST, 33 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
852 AM CDT THU AUG 11 2011
OKZ023>025-027-029-111415-
CADDO OK-CANADIAN OK-CLEVELAND OK-GRADY OK-OKLAHOMA OK-
852 AM CDT THU AUG 11 2011
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR CADDO...CANADIAN...
CLEVELAND...GRADY AND OKLAHOMA COUNTIES.
AT 852 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM
EXTREME NORTHERN OKLAHOMA CITY TO 3 MILES NORTH OF LAKE CHICKASHA...
MOVING EAST AT 30 MPH.
HAZARDS INCLUDE...
HAIL UP TO ONE-HALF INCH...
WIND GUSTS TO 50 MPH...
FREQUENT CLOUD TO GROUND LIGHTNING...
MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.
LAT...LON 3531 9763 3533 9767 3527 9767 3507 9788
3512 9828 3570 9796 3569 9724
30Special weather statement, Aug 11, 8:15 AM CST, 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 915 AM CDT THU AUG 11 2011 OKZ019-020-025-026-111445- LINCOLN OK-LOGAN OK-OKLAHOMA OK-PAYNE OK- 915 AM CDT THU AUG 11 2011 ...SIGNIFICANT WEATHER ADVISORY... THIS SIGNIFICANT WEATHER ADVISORY IS FOR LINCOLN...LOGAN...OKLAHOMA AND PAYNE COUNTIES. AT 915 AM CDT...A LINE OF STRONG THUNDERSTORMS WAS LOCATED FROM 3 MILES SOUTH OF PERKINS TO CENTRAL OKLAHOMA CITY...MOVING EAST AT 25 MPH. HAZARDS INCLUDE... WIND GUSTS TO 40 MPH... FREQUENT CLOUD TO GROUND LIGHTNING... MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING WEATHER CONDITIONS. LAT...LON 3602 9683 3539 9718 3540 9761 3600 9757 30
The radar
The Norman radar (KTLX), 41 km away, was scanning. The volume nearest the first event began at 14:24 UTC.
Event by event
3 hail, 1 thunderstorm wind. Local standard time, as filed.
Hail, Garvin
- When
- August 11, 9:28 AM CST
- Where
- Garvin County, Elmore City
- Measured
- 0.75 in hail
- Reported by
- Amateur Radio
- Coordinates
- 34.620, -97.400
Hail, Garvin
- When
- August 11, 9:31 AM CST
- Where
- Garvin County, Pauls Valley
- Measured
- 0.88 in hail
- Reported by
- Public
- Coordinates
- 34.740, -97.220
Thunderstorm Wind, Carter
- When
- August 11, 10:00 AM CST
- Where
- Carter County, 7 mi WNW of Ardmore
- Measured
- 54 kt (62 mph) measured gust
- Reported by
- Mesonet
- Coordinates
- 34.209, -97.253
What these are
- Hail
- Hail three-quarters of an inch or larger, or smaller hail that caused damage, filed with the largest stone measured.
- Thunderstorm Wind
- Winds from a thunderstorm of 50 knots (58 mph) or more, or lower winds that caused damage or casualties. Measured gusts are marked MG, estimated EG.
After NWS Directive 10-1605, the rules offices file Storm Data by.
The same day elsewhere
- Tornadoes and Hail in Nebraska, August 11, 2011
- Flash Flood and Hail in Texas, August 11, 2011
- Damaging Winds in South Dakota, August 11, 2011
- Hail and Damaging Winds in Nebraska, August 11 to 12, 2011
- Flash Flood and Hail in South Carolina, August 11, 2011
- Flash Flood and Damaging Wind in Arizona, August 11, 2011
- Hail and Damaging Winds in South Dakota, August 11, 2011
- Hail and Damaging Winds in North Carolina, August 11, 2011
- Hail in South Dakota, August 11, 2011
- Hail and Damaging Wind in North Dakota, August 11, 2011
- Hail and Damaging Winds in South Dakota, August 11, 2011
- Hail and Damaging Winds in Montana, August 11, 2011
More
Every storm in Oklahoma in 2011Every state in 2011This day in weather historyWarnings in Oklahoma, August 2011
Sources
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: 345089, 345091, 345092, 345090.