Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 136, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at May 1, 2011, 12:08 PM CDT for Atoka County, Bryan County, Marshall County, Oklahoma. It was in force for 67 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- May 1, 2011, 12:08 PM CDT (17:08 UTC)
- Expired
- May 1, 2011, 1:15 PM CDT
- In force
- 67 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Atoka County, OK, Bryan County, OK, Marshall County, OK
The radar
The Norman radar (KTLX), 159 km from the middle of the area, began a volume at 17:10 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 5.1 hours before the alert went out and 155 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1724 m above ground
- 0-6 km bulk shear
- 79 kt
- 0-1 km storm-relative helicity
- 10 m²/s²
- 0-3 km storm-relative helicity
- 547 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at May 1, 10:09 AM CDT, 1 hour 59 minutes earlier.
Area forecast discussion, May 1, 10:09 AM CDT, 1 hour 59 minutes before
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</html>Hazardous weather outlook, May 1, 11:00 AM CDT, 1 hour 8 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE NORMAN OK
1100 AM CDT SUN MAY 1 2011
OKZ004>048-050>052-TXZ083>090-021000-
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-
1100 AM CDT SUN MAY 1 2011
THIS HAZARDOUS WEATHER OUTLOOK COVERS NORTHERN...WESTERN...
CENTRAL...AND SOUTHERN OKLAHOMA...AND WESTERN NORTH TEXAS.
.DAY ONE...THIS AFTERNOON AND TONIGHT...
THUNDERSTORM OUTLOOK...
THUNDERSTORMS WILL AFFECT PARTS OF OKLAHOMA AND WESTERN NORTH TEXAS
THROUGH TONIGHT. HOWEVER... NO ORGANIZED SEVERE WEATHER IS EXPECTED.
DISCUSSION...
A SURFACE COLD FRONT WILL REMAIN SOUTH OF THE REGION...STRETCHED
ACROSS CENTRAL AND NORTHEAST TEXAS. ABOVE THE SURFACE...HOWEVER...
GULF MOISTURE WILL ADVANCE NORTHWARD...WHILE AN APPROACHING UPPER
LEVEL TROUGH PROVIDES INCREASING LIFT. ISOLATED TO SCATTERED
THUNDERSTORMS WILL AFFECT PARTS OF CENTRAL AND SOUTHERN OKLAHOMA...
AND WESTERN NORTH TEXAS TODAY. SOME OF THESE STORMS MAY BECOME
STRONG PRODUCING SMALL HAIL AND GUSTY WINDS. OTHERWISE... CLOUD TO
GROUND LIGHTNING AND BRIEF HEAVY DOWNPOURS WILL BE THE MAIN CONCERN
WITH THE STORMS.
THE SHOWER AND THUNDERSTORM ACTIVITY IS EXPECTED TO DECREASE LATER
THIS AFTERNOON AND EVENING. HOWEVER... A SECOND WAVE OF RAIN AND
THUNDERSTORM DEVELOPMENT IS EXPECTED LATER TONIGHT OVER WESTERN
NORTH TEXAS AND PARTS OF OKLAHOMA...AS THE UPPER LEVEL TROUGH
ARRIVES FROM THE WEST.
PROBABILITY TABLE...
VALID THROUGH 700 AM CDT MONDAY MAY 2.
PROBABILITY OF THUNDERSTORMS OCCURRING IN THE
NWS NORMAN COUNTY WARNING AREA...100 PERCENT.
PROBABILITY OF SEVERE STORMS IF STORMS OCCUR...15 PERCENT.
OTHER HAZARDOUS WEATHER...
NONE.
.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...
THUNDERSTORM OUTLOOK...
AS THE UPPER LEVEL TROUGH SLOWLY SWINGS THROUGH THE SOUTHERN
PLAINS...SHOWERS AND A FEW THUNDERSTORMS WILL LIKELY OCCUR ON MONDAY
OVER NORTH TEXAS AND SOUTHERN AND CENTRAL OKLAHOMA. SEVERE WEATHER
IS NOT EXPECTED. MUCH OF THE REST OF THE WEEK WILL SEE DRY WEATHER.
A SLIGHT CHANCE OF THUNDERSTORMS MAY RETURN BY FRIDAY.
OTHER HAZARDOUS WEATHER...
ON WEDNESDAY...DRY AND WINDY WEATHER WILL ELEVATE THE FIRE RISK
ACROSS WESTERN OKLAHOMA AND WESTERN NORTH TEXAS.
THE NEXT SCHEDULED HAZARDOUS WEATHER OUTLOOK WILL BE ISSUED BY 5 AM
MONDAY.
MAXWELLIn the hours before
Local storm report, May 1, 9:55 AM CDT, 2 hours 13 minutes before
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</html>Special weather statement, May 1, 11:39 AM CDT, 29 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1139 AM CDT SUN MAY 1 2011
OKZ051-052-011715-
BRYAN OK-MARSHALL OK-
1139 AM CDT SUN MAY 1 2011
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR BRYAN AND MARSHALL COUNTIES.
AT 1139 AM CDT...A STRONG THUNDERSTORM WAS LOCATED 27 MILES SOUTHWEST
OF WILLIS...MOVING NORTHEAST AT 50 MPH. THIS STORM WILL AFFECT THE
LAKE TEXOMA AREA.
HAZARDS INCLUDE...
HAIL UP TO THE SIZE OF NICKELS...
FREQUENT CLOUD TO GROUND LIGHTNING...
MONITOR THE WEATHER SITUATION CLOSELY AND BE ALERT FOR THREATENING
WEATHER CONDITIONS.
LAT...LON 3378 9642 3377 9649 3381 9652 3383 9659
3385 9662 3389 9660 3391 9667 3385 9668
3383 9675 3386 9680 3385 9686 3391 9689
3391 9688 3408 9672 3385 9617 3375 9639Special weather statement, May 1, 11:58 AM CDT, 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1158 AM CDT SUN MAY 1 2011
OKZ025-026-028>030-039>042-046-011730-
LINCOLN OK-OKLAHOMA OK-POTTAWATOMIE OK-CLEVELAND OK-MCCLAIN OK-
MURRAY OK-GARVIN OK-PONTOTOC OK-CARTER OK-STEPHENS OK-
1158 AM CDT SUN MAY 1 2011
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR CARTER...CLEVELAND...
GARVIN...LINCOLN...MCCLAIN...MURRAY...OKLAHOMA...PONTOTOC...
POTTAWATOMIE AND STEPHENS COUNTIES.
AT 1156 AM CDT...SCATTERED THUNDERSTORMS EXTENDED FROM OKLAHOMA
CITY...TO LINDSEY AND DUNCAN...TO NEAR ARDMORE. THE STORMS WERE
MOVING NORTHEAST AT 60 MPH. ALL OF THE STORMS WILL BE CAPABLE OF
PRODUCING SMALL HAIL.
HAZARDS INCLUDE...
THE STRONGEST STORMS MAY PRODUCE HAIL UP TO THE SIZE OF PENNIES...
NO SEVERE WEATHER IS EXPECTED.
LAT...LON 3588 9687 3532 9688 3456 9680 3431 9766
3491 9750 3537 9759Special weather statement, May 1, 12:00 PM CDT, 8 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
1200 PM CDT SUN MAY 1 2011
OKZ051-052-011715-
BRYAN OK-MARSHALL OK-
1200 PM CDT SUN MAY 1 2011
...SIGNIFICANT WEATHER ADVISORY...
THIS SIGNIFICANT WEATHER ADVISORY IS FOR BRYAN AND MARSHALL COUNTIES.
AT NOON CDT...A SEVERE THUNDERSTORM WAS LOCATED 23 MILES SOUTHWEST OF
LAKE TEXOMA...MOVING NORTHEAST AT 45 MPH.
HAZARDS INCLUDE...
HAIL THE SIZE OF QUARTERS...
FREQUENT CLOUD TO GROUND LIGHTNING...
MONITOR THE SITUATION CLOSELY. BE READY TO ACT QUICKLY IF A WARNING
IS ISSUED OR STORMS THREATEN YOU.
LAT...LON 3383 9659 3385 9662 3389 9659 3390 9667
3385 9668 3383 9671 3383 9675 3387 9681
3414 9643 3397 9626 3381 9652The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 1, 5:17 AM CDT | Special Weather Statement | OUN | Love | 43 min |
| May 1, 5:28 AM CDT | Severe Thunderstorm Warning | OUN | Jefferson, Love | 62 min |
| May 1, 5:51 AM CDT | Special Weather Statement | OUN | Bryan, Marshall | 39 min |
| May 1, 6:15 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Jefferson, Johnston, Love, Marshall | 60 min |
| May 1, 6:27 AM CDT | Severe Thunderstorm Warning | OUN | Bryan | 48 min |
| May 1, 6:51 AM CDT | Special Weather Statement | OUN | Tillman | 24 min |
| May 1, 7:15 AM CDT | Severe Thunderstorm Warning | OUN | Atoka, Bryan | 45 min |
| May 1, 7:19 AM CDT | Special Weather Statement | OUN | Cotton, Tillman | 41 min |
| May 1, 7:50 AM CDT | Severe Thunderstorm Warning | OUN | Bryan | 60 min |
| May 1, 8:31 AM CDT | Special Weather Statement | OUN | Cotton | 14 min |
| May 1, 8:48 AM CDT | Special Weather Statement | OUN | Cotton | 27 min |
| May 1, 9:12 AM CDT | Special Weather Statement | OUN | Stephens | 18 min |
| May 1, 9:18 AM CDT | Special Weather Statement | OUN | Comanche | 27 min |
| May 1, 9:25 AM CDT | Special Weather Statement | OUN | Grady | 20 min |
| May 1, 9:40 AM CDT | Special Weather Statement | OUN | McClain | 20 min |
| May 1, 9:53 AM CDT | Special Weather Statement | OUN | Cleveland | 22 min |
| May 1, 11:09 AM CDT | Special Weather Statement | OUN | Cleveland, Garvin, McClain, Oklahoma | 21 min |
| May 1, 11:28 AM CDT | Special Weather Statement | OUN | Carter, Cleveland, Garvin, McClain, Oklahoma | 32 min |
| May 1, 11:39 AM CDT | Special Weather Statement | OUN | Bryan | 36 min |
| May 1, 11:58 AM CDT | Special Weather Statement | OUN | Cleveland, Garvin, Lincoln, McClain, Murray, Pottawatomie | 32 min |
| May 1, 12:00 PM CDT | Special Weather Statement | OUN | Marshall | 15 min |
| May 1, 12:23 PM CDT | Special Weather Statement | OUN | Cleveland, Garvin, Lincoln, McClain, Oklahoma, Payne and 2 more | 22 min |
| May 1, 12:52 PM CDT | Special Weather Statement | OUN | Cleveland, Garvin, Hughes, Lincoln, McClain, Oklahoma and 3 more | 23 min |
| May 1, 1:12 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Bryan | 49 min |
| May 1, 3:45 PM CDT | Special Weather Statement | OUN | Marshall | 15 min |
| May 1, 4:30 PM CDT | Special Weather Statement | OUN | Johnston | 15 min |
| May 1, 4:47 PM CDT | Special Weather Statement | OUN | Marshall | 28 min |
| May 1, 5:11 PM CDT | Special Weather Statement | OUN | Coal, Johnston, Marshall | 34 min |
| May 1, 6:18 PM CDT | Special Weather Statement | OUN | Atoka, Bryan | 27 min |
| May 1, 6:49 PM CDT | Areal Flood Advisory | OUN | Atoka, Bryan | 3 hr |
| May 1, 6:56 PM CDT | Special Weather Statement | OUN | Atoka, Bryan | 34 min |
| May 1, 2:41 AM CDT | Special Weather Statement | OUN | Knox | 19 min |
| May 1, 3:02 AM CDT | Special Weather Statement | OUN | Foard, Knox | 28 min |
| May 1, 3:34 AM CDT | Severe Thunderstorm Warning | OUN | Baylor, Foard, Knox, Wilbarger | 56 min |
| May 1, 4:32 AM CDT | Severe Thunderstorm Warning | OUN | Archer, Baylor, Clay | 58 min |
| May 1, 5:13 AM CDT | Special Weather Statement | OUN | Wichita | 17 min |
| May 1, 6:20 AM CDT | Special Weather Statement | OUN | Wilbarger | 25 min |
| May 1, 8:16 AM CDT | Special Weather Statement | OUN | Wichita | 14 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2011Every severe thunderstorm warning in 2011
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; radar from the NEXRAD Level II archive.