Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 71, NWS Norman, OK

May 24, 2011Bryan County, Oklahoma

NWS Norman, OK issued this tornado warning at May 24, 2011, 9:17 PM CDT for Bryan County, Oklahoma. It was in force for 28 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: May 24, 2011, 9:17 PM CDT (02:17 UTC)
Expired: May 24, 2011, 9:45 PM CDT
In force: 28 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

County Bryan County, OK

The radar

The Dallas/Ft Worth radar (KFWS), 197 km from the middle of the area, began a volume at 02:20 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 24, 12:47 PM CDT	Tornado Watch PDS	SPC	11 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 2.3 hours before the alert went out and 176 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2867 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1457 m above ground
0-6 km bulk shear: 69 kt
0-1 km storm-relative helicity: 357 m²/s²
0-3 km storm-relative helicity: 602 m²/s²
Significant tornado parameter: 6.2
Supercell composite: 44.3

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

152 
WFUS54 KOUN 250217
TOROUN
OKC013-250245-
/O.NEW.KOUN.TO.W.0071.110525T0217Z-110525T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE NORMAN OK
917 PM CDT TUE MAY 24 2011

THE NATIONAL WEATHER SERVICE IN NORMAN HAS ISSUED A

* TORNADO WARNING FOR...
  EXTREME SOUTHEASTERN BRYAN COUNTY IN SOUTHEAST OKLAHOMA...

* UNTIL 945 PM CDT

* AT 918 PM CDT...NATIONAL WEATHER SERVICE RADAR INDICATED A SEVERE
  THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 14 MILES SOUTH OF
  BOSWELL...MOVING EAST AT 50 MPH.

* THE TORNADO WILL GENERALLY REMAIN IN RURAL AREAS OF BRYAN COUNTY.

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 3385 9576 3386 9580 3383 9584 3389 9593
      3385 9596 3385 9598 3388 9600 3392 9588
      3389 9584 3388 9576 3386 9575
TIME...MOT...LOC 0218Z 250DEG 42KT 3383 9586

$$

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 24, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Love	34 min
May 24, 7:13 PM CDT	Tornado Warning	OUN	Seminole	17 min
May 24, 7:19 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	41 min
May 24, 7:25 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Marshall	65 min
May 24, 7:29 PM CDT	Tornado Warning	OUN	Love, Marshall	46 min
May 24, 7:33 PM CDT	Tornado Warning	OUN	Johnston	42 min
May 24, 7:39 PM CDT	Tornado Warning	OUN	Marshall	51 min
May 24, 7:46 PM CDT	Tornado Warning	OUN	Coal	44 min
May 24, 7:54 PM CDT	Tornado Warning	OUN	Atoka, Bryan, Johnston	51 min
May 24, 7:58 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	62 min
May 24, 8:06 PM CDT	Tornado Warning	OUN	Atoka, Coal	39 min
May 24, 8:20 PM CDT	Tornado Warning	OUN	Bryan	55 min
May 24, 8:23 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	67 min
May 24, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	61 min
May 24, 8:44 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	37 min
May 24, 9:00 PM CDT	Severe Thunderstorm Warning	OUN	Bryan	60 min
May 24, 9:32 PM CDT	Special Weather Statement	OUN	Hughes	28 min
May 24, 9:48 PM CDT	Special Weather Statement	OUN	Hughes	27 min
May 24, 10:05 PM CDT	Special Weather Statement	OUN	Bryan	25 min
May 25, 1:49 AM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 10 more	17 hr
May 25, 2:01 AM CDT	Special Weather Statement	OUN	Harper	59 min
May 25, 3:09 AM CDT	Special Weather Statement	OUN	Ellis, Harper, Woods, Woodward	51 min

Nearby

Tornado Warnings in Oklahoma, 2011 Every tornado warning in 2011 Tornadoes 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.