Alert archive / Oklahoma / Tornado Warnings in 2011
Tornado Warning 22, NWS Norman, OK
NWS Norman, OK issued this tornado warning at Apr 22, 2011, 7:45 PM CDT for 5 counties in Oklahoma. It was in force for 45 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 22, 2011, 7:45 PM CDT (00:45 UTC)
- Expired
- Apr 22, 2011, 8:30 PM CDT
- In force
- 45 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Garvin County, OK, McClain County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK
The radar
The Norman radar (KTLX), 58 km from the middle of the area, began a volume at 00:46 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 22, 8:04 PM CDT | TORNADO | 2 Se Byars, OK | TORNADO AT US HWY 177 AND STATE HWY 59 |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 22, 3:47 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Lamont, OK (KLMN), launched 00:00Z, 0.8 hours before the alert went out and 196 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
- 2322 m above ground
- 0-6 km bulk shear
- 58 kt
- 0-1 km storm-relative helicity
- -25 m²/s²
- 0-3 km storm-relative helicity
- 231 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
869 WFUS54 KOUN 230045 TOROUN OKC049-087-123-125-133-230130- /O.NEW.KOUN.TO.W.0022.110423T0045Z-110423T0130Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE NORMAN OK 745 PM CDT FRI APR 22 2011 THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A * TORNADO WARNING FOR... SOUTHEASTERN MCCLAIN COUNTY IN CENTRAL OKLAHOMA... SOUTHEASTERN POTTAWATOMIE COUNTY IN CENTRAL OKLAHOMA... NORTHWESTERN PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA... SOUTHWESTERN SEMINOLE COUNTY IN EAST CENTRAL OKLAHOMA... NORTHEASTERN GARVIN COUNTY IN SOUTHERN OKLAHOMA... * UNTIL 830 PM CDT * AT 746 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR BYARS...MOVING EAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE ASHER...BYARS AND KONAWA. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW. LEAVE MOBILE HOMES AND VEHICLES. IF POSSIBLE...MOVE TO A BASEMENT OR STORM SHELTER. OTHERWISE MOVE TO AN INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM WINDOWS AND OUTSIDE WALLS. && LAT...LON 3506 9675 3479 9669 3482 9709 3491 9713 TIME...MOT...LOC 0046Z 270DEG 15KT 3487 9706 $$
3 follow-up statements
539 WWUS54 KOUN 230050 SVSOUN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 750 PM CDT FRI APR 22 2011 OKC049-087-123-125-133-230130- /O.CON.KOUN.TO.W.0022.000000T0000Z-110423T0130Z/ POTTAWATOMIE OK-SEMINOLE OK-MCCLAIN OK-GARVIN OK-PONTOTOC OK- 750 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR NORTHWESTERN PONTOTOC...NORTHEASTERN GARVIN...SOUTHEASTERN MCCLAIN... SOUTHWESTERN SEMINOLE AND SOUTHEASTERN POTTAWATOMIE COUNTIES... PEOPLE IN BYARS SHOULD TAKE SHELTER IMMEDIATELY. AT 749 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED THAT A TORNADO IS LIKELY OCCURRING NEAR BYARS. THE STORM IS MOVING EAST AT 10 MPH. * LOCATIONS IN THE WARNING INCLUDE ASHER...BYARS AND KONAWA. LAT...LON 3506 9675 3479 9669 3482 9709 3491 9713 TIME...MOT...LOC 0049Z 269DEG 8KT 3487 9706 $$ ..SPEG.
467 WWUS54 KOUN 230105 SVSOUN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 805 PM CDT FRI APR 22 2011 OKC049-087-123-125-133-230130- /O.CON.KOUN.TO.W.0022.000000T0000Z-110423T0130Z/ POTTAWATOMIE OK-SEMINOLE OK-MCCLAIN OK-GARVIN OK-PONTOTOC OK- 805 PM CDT FRI APR 22 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR NORTHWESTERN PONTOTOC...NORTHEASTERN GARVIN...SOUTHEASTERN MCCLAIN... SOUTHWESTERN SEMINOLE AND SOUTHEASTERN POTTAWATOMIE COUNTIES... RESIDENTS OF BYARS SHOULD BE IN SHELTER. AT 805 PM CDT...SPOTTERS AND METEOROLOGISTS CONFIRM A TORNADO IS OCCURRING BETWEEN BYARS AND STRATFORD. THE STORM IS MOVING EAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE ASHER...BYARS AND KONAWA. LAT...LON 3506 9675 3479 9669 3482 9709 3491 9713 TIME...MOT...LOC 0101Z 270DEG 12KT 3486 9704 $$ ..SPEG.
792
WWUS54 KOUN 230123
SVSOUN
SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE NORMAN OK
823 PM CDT FRI APR 22 2011
OKC125-133-230129-
/O.CAN.KOUN.TO.W.0022.000000T0000Z-110423T0130Z/
POTTAWATOMIE OK-SEMINOLE OK-
823 PM CDT FRI APR 22 2011
...THE TORNADO WARNING HAS BEEN CANCELLED FOR SOUTHWESTERN SEMINOLE
AND SOUTHEASTERN POTTAWATOMIE COUNTIES...
THE TORNADIC PORTION OF THE SEVERE THUNDERSTORM HAS BEGUN TO MOVE
EAST-SOUTHEAST AND IS EXPECTED TO REMAIN SOUTH OF POTTAWATOMIE AND
SEMINOLE COUNTIES. HOWEVER... A SEVERE THUNDERSTORM WARNING REMAINS
IN EFFECT FOR SOUTHERN POTTAWATOMIE AND SOUTHERN SEMINOLE COUNTIES
AND HAIL TO THE SIZE OF HALF DOLLARS AND WINDS OF 60 MPH ARE STILL
POSSIBLE.
LAT...LON 3479 9669 3482 9709 3492 9706 3491 9702
3496 9696 3496 9691 3493 9688 3495 9681
3491 9678 3489 9674 3487 9673 3486 9670
TIME...MOT...LOC 0119Z 270DEG 12KT 3486 9697
$$
OKC049-087-123-230130-
/O.CON.KOUN.TO.W.0022.000000T0000Z-110423T0130Z/
MCCLAIN OK-GARVIN OK-PONTOTOC OK-
823 PM CDT FRI APR 22 2011
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR
NORTHWESTERN PONTOTOC...NORTHEASTERN GARVIN AND SOUTHEASTERN MCCLAIN
COUNTIES...
FARHTER SOUTH... A TORNADO WARNING REMAINS IN EFFECT FOR WESTERN
PONTOTOC AND EASTERN GARVIN COUNTIES UNTIL 845 PM INCLUDING THE
STRATFORD AREA. NATIONAL WEATHER SERVICE RADAR CONTINUES TO DETECTED
A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR
STRATFORD...MOVING EAST AT 15 MPH.
* LOCATIONS IN THE WARNING INCLUDE BYARS.
LAT...LON 3479 9669 3482 9709 3492 9706 3491 9702
3496 9696 3496 9691 3493 9688 3495 9681
3491 9678 3489 9674 3487 9673 3486 9670
TIME...MOT...LOC 0119Z 270DEG 12KT 3486 9697
$$
..SPEG.The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 22, 7:00 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Lincoln, McClain, Pontotoc, Pottawatomie, Seminole | 60 min |
| Apr 22, 7:06 PM CDT | Severe Thunderstorm Warning | OUN | Cotton, Jefferson, Stephens | 39 min |
| Apr 22, 7:20 PM CDT | Special Weather Statement | OUN | McClain | 10 min |
| Apr 22, 7:26 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Grady, McClain | 34 min |
| Apr 22, 7:30 PM CDT | Severe Thunderstorm Warning | OUN | Jefferson | 45 min |
| Apr 22, 7:34 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Garvin, Stephens | 15 min |
| Apr 22, 7:59 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Grady, McClain, Pontotoc, Pottawatomie, Seminole and 1 more | 61 min |
| Apr 22, 8:09 PM CDT | Tornado Warning | OUN | Garvin, Pontotoc | 36 min |
| Apr 22, 8:14 PM CDT | Flash Flood Warning | OUN | Garvin, McClain, Pottawatomie | 3 hr |
| Apr 22, 8:14 PM CDT | Severe Thunderstorm Warning | OUN | Jefferson | 46 min |
| Apr 22, 8:19 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Stephens | 41 min |
| Apr 22, 8:44 PM CDT | Tornado Warning | OUN | Pontotoc | 31 min |
| Apr 22, 8:45 PM CDT | Severe Thunderstorm Warning | OUN | Jefferson | 34 min |
| Apr 22, 8:59 PM CDT | Severe Thunderstorm Warning | OUN | Coal, Garvin, Grady, Hughes, Murray, Pontotoc and 2 more | 61 min |
| Apr 22, 8:59 PM CDT | Severe Thunderstorm Warning | OUN | Cotton, Stephens | 61 min |
| Apr 22, 9:13 PM CDT | Severe Thunderstorm Warning | OUN | Stephens | 32 min |
| Apr 22, 9:29 PM CDT | Areal Flood Advisory | OUN | Garvin, Grady, Pontotoc, Stephens | 3 hr |
| Apr 22, 9:37 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Coal, Hughes | 53 min |
| Apr 22, 9:41 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Tillman | 64 min |
| Apr 22, 9:50 PM CDT | Flash Flood Warning | OUN | Cotton | 4 hr |
| Apr 22, 9:58 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Jefferson, Stephens | 47 min |
| Apr 22, 9:58 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, Johnston, Murray, Pontotoc | 62 min |
| Apr 22, 10:18 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Garvin, Grady, McClain, Stephens | 57 min |
| Apr 22, 10:30 PM CDT | Severe Thunderstorm Warning | OUN | Atoka, Coal | 43 min |
| Apr 22, 10:41 PM CDT | Severe Thunderstorm Warning | OUN | Comanche, Cotton, Jefferson, Stephens | 49 min |
| Apr 22, 11:06 PM CDT | Severe Thunderstorm Warning | OUN | Pontotoc | 54 min |
| Apr 22, 11:22 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Garvin, McClain, Pottawatomie | 53 min |
| Apr 22, 11:29 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Comanche, Cotton, Garvin, Jefferson, Stephens | 61 min |
| Apr 22, 11:34 PM CDT | Special Weather Statement | OUN | Atoka | 26 min |
| Apr 22, 11:49 PM CDT | Severe Thunderstorm Warning | OUN | Cleveland, Garvin, McClain, Pontotoc, Pottawatomie | 56 min |
| Apr 23, 12:13 AM CDT | Severe Thunderstorm Warning | OUN | Hughes, Pottawatomie, Seminole | 33 min |
| Apr 23, 12:29 AM CDT | Severe Thunderstorm Warning | OUN | Comanche, Grady, Stephens | 46 min |
| Apr 23, 12:32 AM CDT | Severe Thunderstorm Warning | OUN | Coal, Hughes, Pontotoc | 19 min |
| Apr 23, 12:56 AM CDT | Special Weather Statement | OUN | Coal | 19 min |
| Apr 23, 1:14 AM CDT | Special Weather Statement | OUN | Hughes | 31 min |
| Apr 23, 1:40 AM CDT | Special Weather Statement | OUN | Atoka | 20 min |
| Apr 23, 4:58 PM CDT | Special Weather Statement | OUN | Love | 17 min |
| Apr 23, 5:21 PM CDT | Special Weather Statement | OUN | Love | 24 min |
| Apr 23, 5:42 PM CDT | Special Weather Statement | OUN | Love | 18 min |
| Apr 23, 6:05 PM CDT | Special Weather Statement | OUN | Love | 10 min |
| Apr 23, 6:36 PM CDT | Special Weather Statement | OUN | Marshall | 9 min |
| Apr 23, 6:52 PM CDT | Special Weather Statement | OUN | Love | 23 min |
| Apr 23, 6:58 PM CDT | Severe Thunderstorm Warning | OUN | Love | 62 min |
Nearby
Tornado Warnings in Oklahoma, 2011Every tornado warning in 2011Tornadoes 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.