Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 63, NWS Tulsa, OK

May 20, 2011Haskell County, LeFlore County, Sequoyah County, Oklahoma

NWS Tulsa, OK issued this tornado warning at May 20, 2011, 11:47 AM CDT for Haskell County, LeFlore County, Sequoyah 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 20, 2011, 11:47 AM CDT (16:47 UTC)
Expired: May 20, 2011, 12:15 PM CDT
In force: 28 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

Counties Haskell County, OK, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 40 km from the middle of the area, began a volume at 16:50 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 20, 11:03 AM CDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 4.8 hours before the alert went out and 191 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: 537 J/kg
Mixed-layer CIN: -280 J/kg
Mixed-layer LCL: 940 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 222 m²/s²
0-3 km storm-relative helicity: 161 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.6

Open this sounding in Storm Lab

The text

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

693 
WFUS54 KTSA 201647
TORTSA
OKC061-079-135-201715-
/O.NEW.KTSA.TO.W.0063.110520T1647Z-110520T1715Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
1147 AM CDT FRI MAY 20 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHERN SEQUOYAH COUNTY IN EAST CENTRAL OKLAHOMA
  EASTERN HASKELL COUNTY IN SOUTHEAST OKLAHOMA
  NORTHERN LE FLORE COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 1215 PM CDT

* AT 1143 AM CDT...A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A
  TORNADO WAS LOCATED 2 MILES NORTHEAST OF KEOTA...MOVING NORTHEAST
  AT 30 MPH.

* SOME LOCATIONS IN OR NEAR THE PATH OF THIS STORM INCLUDE...GANS AND
  SALLISAW.

THIS INCLUDES INTERSTATE 40 BETWEEN MILE MARKERS 306 AND 319.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL MAY OBSCURE THIS TORNADO. TAKE COVER NOW! IF YOU WAIT
TO SEE OR HEAR IT COMING...IT MAY BE TOO LATE TO GET TO A SAFE PLACE.

&&

LAT...LON 3550 9475 3538 9457 3523 9489 3529 9497
TIME...MOT...LOC 1647Z 222DEG 28KT 3530 9487

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
May 19, 10:33 PM CDT	Special Weather Statement	TSA	Osage, Pawnee	57 min
May 19, 11:34 PM CDT	Special Weather Statement	TSA	Osage, Pawnee	56 min
May 20, 12:01 AM CDT	Special Weather Statement	TSA	Creek	29 min
May 20, 12:27 AM CDT	Special Weather Statement	TSA	Creek, Osage, Pawnee	33 min
May 20, 1:02 AM CDT	Special Weather Statement	TSA	Osage	28 min
May 20, 1:06 AM CDT	Special Weather Statement	TSA	Tulsa	24 min
May 20, 2:27 AM CDT	Special Weather Statement	TSA	Wagoner	33 min
May 20, 5:54 AM CDT	Special Weather Statement	TSA	Creek, Osage, Pawnee	66 min
May 20, 6:00 AM CDT	Special Weather Statement	TSA	Muskogee	30 min
May 20, 6:29 AM CDT	Special Weather Statement	TSA	Sequoyah	31 min
May 20, 6:32 AM CDT	Special Weather Statement	TSA	Latimer	28 min
May 20, 6:57 AM CDT	Special Weather Statement	TSA	Cherokee	33 min
May 20, 7:03 AM CDT	Special Weather Statement	TSA	Ottawa	27 min
May 20, 7:14 AM CDT	Special Weather Statement	TSA	Okfuskee, Okmulgee, Tulsa, Washington	31 min
May 20, 7:44 AM CDT	Areal Flood Advisory	TSA	Creek, Tulsa	61 min
May 20, 7:49 AM CDT	Special Weather Statement	TSA	Adair	26 min
May 20, 7:51 AM CDT	Special Weather Statement	TSA	Ottawa	24 min
May 20, 8:42 AM CDT	Special Weather Statement	TSA	Sequoyah	33 min
May 20, 9:34 AM CDT	Special Weather Statement	TSA	Cherokee, McIntosh, Mayes, Muskogee, Pittsburg	26 min
May 20, 9:45 AM CDT	Areal Flood Advisory	TSA	Cherokee, Craig, Delaware, Mayes, Muskogee, Ottawa and 2 more	2 hr
May 20, 9:55 AM CDT	Special Weather Statement	TSA	Adair	35 min
May 20, 10:18 AM CDT	Severe Thunderstorm Warning	TSA	Delaware	27 min
May 20, 11:08 AM CDT	Areal Flood Advisory	TSA	Haskell, Latimer, McIntosh, Muskogee, Pittsburg, Sequoyah	97 min
May 20, 11:12 AM CDT	Flash Flood Watch	TSA	Adair, Cherokee, Choctaw, Craig, Delaware, Haskell and 10 more	16 hr
May 20, 11:19 AM CDT	Special Weather Statement	TSA	Adair, Haskell, Latimer, LeFlore, Sequoyah	26 min
May 20, 11:27 AM CDT	Flash Flood Warning	TSA	Latimer, Pittsburg	2 hr
May 20, 11:35 AM CDT	Severe Thunderstorm Warning	TSA	Adair, Haskell, Latimer, LeFlore, Sequoyah	55 min
May 20, 11:36 AM CDT	Tornado Warning	TSA	Adair, Sequoyah	24 min
May 20, 11:38 AM CDT	Tornado Warning	TSA	Sequoyah	37 min
May 20, 11:54 AM CDT	Severe Thunderstorm Warning	TSA	Adair	66 min
May 20, 12:17 PM CDT	Flash Flood Warning	TSA	Haskell, Latimer, Sequoyah	3 hr
May 20, 12:30 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	60 min
May 20, 1:16 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	29 min
May 20, 1:18 PM CDT	Areal Flood Advisory	TSA	LeFlore, Sequoyah	57 min
May 20, 1:27 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	63 min
May 20, 3:39 PM CDT	Special Weather Statement	TSA	Pittsburg	51 min
May 20, 3:51 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	84 min
May 20, 4:18 PM CDT	Flash Flood Warning	TSA	Haskell, Latimer, LeFlore, Pittsburg, Pushmataha	6 hr
May 20, 4:28 PM CDT	Special Weather Statement	TSA	Latimer	32 min
May 20, 4:40 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Pittsburg, Pushmataha	65 min
May 20, 5:11 PM CDT	Special Weather Statement	TSA	Sequoyah	34 min
May 20, 5:22 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	68 min
May 20, 5:38 PM CDT	Special Weather Statement	TSA	Sequoyah	52 min
May 20, 5:52 PM CDT	Areal Flood Advisory	TSA	Adair, LeFlore, Sequoyah	53 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.