Alert archive / Oklahoma / Tornado Warnings in 2011

Tornado Warning 45, NWS Tulsa, OK

April 19, 2011LeFlore County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Apr 19, 2011, 6:44 PM CDT for LeFlore 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: Apr 19, 2011, 6:44 PM CDT (23:44 UTC)
Expired: Apr 19, 2011, 7:15 PM CDT
In force: 31 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 78 km from the middle of the area, began a volume at 23:44 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 19, 6:51 PM CDT	HAIL 0.75	5 Ne Big Cedar, OK

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 19, 2:16 PM CDT	Tornado Watch	SPC	10 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 12:00Z, 11.7 hours before the alert went out and 249 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: 2420 J/kg
Mixed-layer CIN: -204 J/kg
Mixed-layer LCL: 642 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 299 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

Open this sounding in Storm Lab

The text

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

651 
WFUS54 KTSA 192344
TORTSA
OKC079-200015-
/O.NEW.KTSA.TO.W.0045.110419T2344Z-110420T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TULSA OK
644 PM CDT TUE APR 19 2011

THE NATIONAL WEATHER SERVICE IN TULSA HAS ISSUED A

* TORNADO WARNING FOR...
  SOUTHEASTERN LE FLORE COUNTY IN SOUTHEAST OKLAHOMA

* UNTIL 715 PM CDT

* AT 639 PM CDT...A SEVERE THUNDERSTORM WITH A HISTORY OF PRODUCING A
  TORNADO WAS LOCATED 5 MILES SOUTH OF BIG CEDAR...MOVING EAST AT 35
  MPH. THIS IS A DANGEROUS STORM...TAKE COVER NOW!

* THE TORNADO WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE
  INDICATED COUNTY...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF NO UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON
THE LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR
MORE SUBSTANTIAL SHELTER. AVOID WINDOWS!

&&

LAT...LON 3453 9472 3471 9473 3476 9445 3462 9445
      3451 9446
TIME...MOT...LOC 2344Z 260DEG 31KT 3458 9458

$$

2 follow-up statements

515 
WWUS54 KTSA 192358
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
658 PM CDT TUE APR 19 2011

OKC079-200015-
/O.CON.KTSA.TO.W.0045.000000T0000Z-110420T0015Z/
LE FLORE OK-
658 PM CDT TUE APR 19 2011

...TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
SOUTHEASTERN LE FLORE COUNTY...

AT 653 PM CDT...NWS METEOROLOGISTS CONTINUED TO TRACK A SEVERE 
THUNDERSTORM WITH A HISTORY OF PRODUCING A TORNADO LOCATED 10 MILES 
EAST OF BIG CEDAR...MOVING EAST AT 35 MPH. THIS VERY DANGEROUS STORM 
HAS A HISTORY OF PRODUCING A TORNADO...TAKE COVER NOW!

PRECAUTIONARY/PREPAREDNESS ACTIONS...

IF NO UNDERGROUND SHELTER IS AVAILABLE MOVE TO AN INTERIOR ROOM ON 
THE LOWEST FLOOR. MOBILE HOMES AND VEHICLES SHOULD BE ABANDONED FOR 
MORE SUBSTANTIAL SHELTER. AVOID WINDOWS!

&&

LAT...LON 3459 9470 3472 9469 3476 9445 3462 9445
      3455 9446
TIME...MOT...LOC 2357Z 257DEG 30KT 3461 9444

$$

195 
WWUS54 KTSA 200013
SVSTSA

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE TULSA OK
713 PM CDT TUE APR 19 2011

OKC079-200023-
/O.EXP.KTSA.TO.W.0045.000000T0000Z-110420T0015Z/
LE FLORE OK-
713 PM CDT TUE APR 19 2011

...THE TORNADO WARNING FOR SOUTHEASTERN LE FLORE COUNTY EXPIRES AT
715 PM CDT...

THE THUNDERSTORM HAS MOVED OUT OF THE WARNED AREA...THEREFORE THE
TORNADO WARNING WILL BE ALLOWED TO EXPIRE.

A TORNADO WATCH REMAINS IN EFFECT UNTIL 10 PM.

LAT...LON 3459 9470 3472 9469 3476 9445 3462 9445
      3455 9446
TIME...MOT...LOC 0013Z 257DEG 30KT 3464 9428

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 19, 3:46 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg, Pushmataha	59 min
Apr 19, 3:58 PM CDT	Tornado Warning	TSA	Pushmataha	62 min
Apr 19, 4:12 PM CDT	Special Weather Statement	TSA	Sequoyah	33 min
Apr 19, 4:55 PM CDT	Tornado Warning	TSA	Pushmataha	65 min
Apr 19, 5:01 PM CDT	Special Weather Statement	TSA	Choctaw	59 min
Apr 19, 5:40 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pushmataha	35 min
Apr 19, 5:51 PM CDT	Tornado Warning	TSA	LeFlore, Pushmataha	54 min
Apr 19, 6:07 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.