Alert archive / Oklahoma / Tornado Warnings in 2011
Tornado Warning 32, NWS Norman, OK
NWS Norman, OK issued this tornado warning at May 21, 2011, 7:40 PM CDT for Johnston County, Murray County, Pontotoc County, Oklahoma. It was in force for 31 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
- May 21, 2011, 7:40 PM CDT (00:40 UTC)
- Expired
- May 21, 2011, 8:11 PM CDT
- In force
- 31 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
Counties Johnston County, OK, Murray County, OK, Pontotoc County, OK
The radar
The Norman radar (KTLX), 98 km from the middle of the area, began a volume at 00:40 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 |
|---|---|---|---|
| May 21, 7:40 PM CDT | TORNADO | 1 Ese Hickory, OK | MULTIPLE REPORTS |
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 |
|---|---|---|---|
| May 21, 7:08 PM CDT | Tornado Watch | SPC | 3 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 0.7 hours before the alert went out and 95 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
- 1388 J/kg
- Mixed-layer CIN
- -20 J/kg
- Mixed-layer LCL
- 2020 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 144 m²/s²
- 0-3 km storm-relative helicity
- 205 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.5
The text
As transmitted, in the capitals the NWS used until 2016.
080 WFUS54 KOUN 220040 TOROUN OKC069-099-123-220130- /O.NEW.KOUN.TO.W.0032.110522T0040Z-110522T0130Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE NORMAN OK 740 PM CDT SAT MAY 21 2011 THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A * TORNADO WARNING FOR... SOUTHERN PONTOTOC COUNTY IN EAST CENTRAL OKLAHOMA... EXTREME NORTHERN JOHNSTON COUNTY IN SOUTHEAST OKLAHOMA... EASTERN MURRAY COUNTY IN SOUTHERN OKLAHOMA... * UNTIL 830 PM CDT * AT 740 PM CDT...RADAR AND STORM SPOTTERS OBSERVED A TORNADO NEAR HICKORY...MOVING EAST AT 15 MPH. * LOCATIONS IN THE WARNING INCLUDE FITTSTOWN...HICKORY AND SCULLIN. 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 3470 9657 3449 9655 3451 9688 3458 9689 TIME...MOT...LOC 0040Z 258DEG 11KT 3455 9682 $$ 30
2 follow-up statements
897 WWUS54 KOUN 220054 SVSOUN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 754 PM CDT SAT MAY 21 2011 OKC069-099-220104- /O.CAN.KOUN.TO.W.0032.000000T0000Z-110522T0130Z/ MURRAY OK-JOHNSTON OK- 754 PM CDT SAT MAY 21 2011 ...THE TORNADO WARNING HAS BEEN CANCELLED FOR EXTREME NORTHWESTERN JOHNSTON AND EASTERN MURRAY COUNTIES... LAT...LON 3452 9655 3456 9682 3461 9682 3470 9657 TIME...MOT...LOC 0054Z 232DEG 16KT 3461 9675 $$ OKC123-220130- /O.CON.KOUN.TO.W.0032.000000T0000Z-110522T0130Z/ PONTOTOC OK- 754 PM CDT SAT MAY 21 2011 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 830 PM CDT FOR SOUTHERN PONTOTOC COUNTY... AT 754 PM CDT...NATIONAL WEATHER SERVICE RADAR DETECTED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 7 MILES WEST OF FITTSTOWN...MOVING NORTHEAST AT 20 MPH. * LOCATIONS IN THE WARNING INCLUDE FITTSTOWN. LAT...LON 3452 9655 3456 9682 3461 9682 3470 9657 TIME...MOT...LOC 0054Z 232DEG 16KT 3461 9675 $$ 30
146 WWUS54 KOUN 220111 SVSOUN SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE NORMAN OK 811 PM CDT SAT MAY 21 2011 OKC123-220120- /O.CAN.KOUN.TO.W.0032.000000T0000Z-110522T0130Z/ PONTOTOC OK- 811 PM CDT SAT MAY 21 2011 ...THE TORNADO WARNING HAS BEEN CANCELLED FOR SOUTHERN PONTOTOC COUNTY... THE STORM HAS MOVED OUT OF THE AREA. A TORNADO WARNING DOES CONTINUE FOR CENTRAL PONTOTOC COUNTY UNTIL 845 PM FOR A STORM SOUTH OF ADA. LAT...LON 3452 9655 3456 9682 3461 9682 3470 9657 TIME...MOT...LOC 0110Z 232DEG 16KT 3468 9669 $$ 30
The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 21, 7:14 PM CDT | Special Weather Statement | OUN | Pottawatomie | 31 min |
| May 21, 7:38 PM CDT | Severe Thunderstorm Warning | OUN | Garvin, McClain, Pontotoc, Pottawatomie, Seminole | 52 min |
| May 21, 7:49 PM CDT | Tornado Warning | OUN | Garvin, McClain, Pontotoc | 41 min |
| May 21, 8:04 PM CDT | Tornado Warning | OUN | Pontotoc | 19 min |
| May 21, 8:24 PM CDT | Tornado Warning | OUN | Pontotoc | 51 min |
| May 21, 9:07 PM CDT | Tornado Warning | OUN | Pontotoc, Seminole | 23 min |
| May 21, 9:29 PM CDT | Severe Thunderstorm Warning | OUN | Hughes, Pontotoc, Seminole | 11 min |
| May 22, 4:35 PM CDT | Special Weather Statement | OUN | Love | 25 min |
| May 22, 4:41 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Jefferson, Love, Marshall | 49 min |
| May 22, 5:15 PM CDT | Severe Thunderstorm Warning | OUN | Carter, Garvin, Johnston, Love, Murray | 45 min |
| May 22, 5:51 PM CDT | Severe Thunderstorm Warning | OUN | Coal, Garvin, Johnston, Murray, Pontotoc, Seminole | 39 min |
| May 22, 6:27 PM CDT | Severe Thunderstorm Warning | OUN | Coal, Hughes, Pontotoc, Seminole | 63 min |
| May 22, 6:31 PM CDT | Severe Thunderstorm Warning | OUN | Jefferson | 59 min |
| May 22, 6:36 PM CDT | Special Weather Statement | OUN | Love | 24 min |
| May 22, 6:55 PM CDT | Severe Thunderstorm Warning | OUN | Love, Marshall | 50 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.