Alert archive / Oklahoma / Tornado Warnings in 2018

Tornado Warning 10, NWS Tulsa, OK

April 13, 2018LeFlore County, Oklahoma

NWS Tulsa, OK issued this tornado warning at Apr 13, 2018, 6:10 PM CDT for LeFlore County, Oklahoma. It was in force for 16 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: Apr 13, 2018, 6:10 PM CDT (23:10 UTC)
Expired: Apr 13, 2018, 6:26 PM CDT
In force: 16 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County LeFlore County, OK

The radar

The Western Arkansas radar (KSRX), 77 km from the middle of the area, began a volume at 23:09 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
Apr 13, 1:20 PM CDT	Tornado Watch	SPC	9 hr

The nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.2 hours before the alert went out and 246 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: 81 J/kg
Mixed-layer CIN: -535 J/kg
Mixed-layer LCL: 655 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 239 m²/s²
0-3 km storm-relative helicity: 283 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

471 
WFUS54 KTSA 132310
TORTSA
OKC079-132345-
/O.NEW.KTSA.TO.W.0010.180413T2310Z-180413T2345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Tulsa OK
610 PM CDT FRI APR 13 2018

The National Weather Service in Tulsa has issued a

* Tornado Warning for...
  Southeastern Le Flore County in southeastern Oklahoma...

* Until 645 PM CDT
    
* At 610 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 9 miles west of Hatfield, moving northeast at 45 mph.

  HAZARD...Tornado and quarter size hail. 

  SOURCE...Radar indicated rotation. 

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely. 

* This tornadic thunderstorm will remain over mainly rural areas of
  southeastern Le Flore County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 3470 9446 3451 9446 3451 9459
TIME...MOT...LOC 2310Z 220DEG 39KT 3450 9454 

TORNADO...RADAR INDICATED
HAIL...1.00IN

$$

1 follow-up statement

977 
WWUS54 KTSA 132326
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
626 PM CDT FRI APR 13 2018

OKC079-132335-
/O.CAN.KTSA.TO.W.0010.000000T0000Z-180413T2345Z/
Le Flore OK-
626 PM CDT FRI APR 13 2018

...THE TORNADO WARNING FOR SOUTHEASTERN LE FLORE COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore the warning has been cancelled.

A tornado watch remains in effect until 1000 PM CDT for southeastern
Oklahoma.

LAT...LON 3470 9446 3451 9446 3451 9459
TIME...MOT...LOC 2324Z 220DEG 39KT 3463 9441 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 13, 2:09 PM CDT	Special Weather Statement	TSA	Pawnee	51 min
Apr 13, 2:18 PM CDT	Special Weather Statement	TSA	Adair	27 min
Apr 13, 2:30 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Osage, Pawnee	30 min
Apr 13, 2:38 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee	52 min
Apr 13, 3:04 PM CDT	Special Weather Statement	TSA	Washington	41 min
Apr 13, 3:17 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee, Okmulgee, Osage, Tulsa, Wagoner	43 min
Apr 13, 3:34 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	41 min
Apr 13, 3:40 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	50 min
Apr 13, 3:49 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Washington	41 min
Apr 13, 3:50 PM CDT	Tornado Warning	TSA	Sequoyah	25 min
Apr 13, 3:54 PM CDT	Severe Thunderstorm Warning	TSA	Muskogee, Okmulgee, Rogers, Tulsa, Wagoner	37 min
Apr 13, 4:13 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg	34 min
Apr 13, 4:22 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	24 min
Apr 13, 4:52 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg, Pushmataha	53 min
Apr 13, 4:54 PM CDT	Special Weather Statement	TSA	Cherokee	36 min
Apr 13, 5:12 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Delaware	33 min
Apr 13, 5:19 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore	41 min
Apr 13, 5:20 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	40 min
Apr 13, 5:30 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore, Pushmataha	45 min
Apr 13, 5:59 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	46 min
Apr 13, 6:26 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	36 min
Apr 13, 6:44 PM CDT	Special Weather Statement	TSA	Pushmataha	31 min

Nearby

Tornado Warnings in Oklahoma, 2018 Every tornado warning in 2018 Tornadoes in 2018

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.