Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 59, NWS Tulsa, OK

April 28, 2021LeFlore County, Sequoyah County, Oklahoma; Crawford County, Sebastian County, Arkansas

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 28, 2021, 9:06 PM CDT for LeFlore County, Sequoyah County, Oklahoma; Crawford County, Sebastian County, Arkansas. It was in force for 39 min. 4 reports 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 28, 2021, 9:06 PM CDT (02:06 UTC)
Expired: Apr 28, 2021, 9:45 PM CDT
In force: 39 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Tornado: Possible
Hail: 1.0 in
Wind: 70.0 mph

Counties Crawford County, AR, Sebastian County, AR, LeFlore County, OK, Sequoyah County, OK

The radar

The Western Arkansas radar (KSRX), 17 km from the middle of the area, began a volume at 02:05 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 28, 9:21 PM CDT	TSTM WND GST 73	2 Sw Rock Island, OK	REPORTED FROM MEDIA STORM TRACKER.
Apr 28, 9:25 PM CDT	HAIL 1	Bonanza, AR	FIRE DEPARTMENT REPORTS PEA TO QUARTER SIZE HAIL.
Apr 28, 9:33 PM CDT	TORNADO	Greenwood, AR	REPORTED ON HIGHWAY 10.
Apr 28, 9:38 PM CDT	TSTM WND DMG	1 N Dayton, AR	TREES DOWN ON HIGHWAY 252.

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 28, 7:55 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 2.1 hours before the alert went out and 201 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: 48 J/kg
Mixed-layer CIN: -143 J/kg
Mixed-layer LCL: 761 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 320 m²/s²
0-3 km storm-relative helicity: 258 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

485 
WUUS54 KTSA 290206
SVRTSA
ARC033-131-OKC079-135-290245-
/O.NEW.KTSA.SV.W.0059.210429T0206Z-210429T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
906 PM CDT Wed Apr 28 2021

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southwestern Crawford County in northwestern Arkansas...
  Northwestern Sebastian County in west central Arkansas...
  Southeastern Sequoyah County in east central Oklahoma...
  Northeastern Le Flore County in southeastern Oklahoma...

* Until 945 PM CDT.

* At 906 PM CDT, a severe thunderstorm was located 3 miles northwest
  of Cameron, moving northeast at 30 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* Locations in or near the path include...
  Fort Smith...                     Van Buren...
  Poteau...                         Greenwood...
  Barling...                        Pocola...
  Spiro...                          Arkoma...
  Panama...                         Hackett...
  Huntington...                     Bonanza...
  Midland...                        Cameron...
  Moffett...                        Excelsior...
  Fort Smith Regional Airport...    Jenny Lind...
  Burnville...                      Shady Point...

This includes the following highways,
 Interstate 40 in Arkansas between mile markers 4 and 6.
 Interstate 540 between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

Intense thunderstorm lines can produce brief tornadoes and widespread
significant wind damage. Although a tornado is not immediately
likely, it is best to move to an interior room on the lowest floor of
a building. This storm may cause serious injury and significant
property damage.

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

A Tornado Watch remains in effect until 200 AM CDT for northwestern
and west central Arkansas...and southeastern Oklahoma.

LAT...LON 3500 9461 3532 9474 3548 9432 3510 9415
TIME...MOT...LOC 0206Z 244DEG 24KT 3517 9458 

TORNADO...POSSIBLE
HAIL...1.00IN
WIND...70MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 28, 7:19 PM CDT	Special Weather Statement	TSA	LeFlore	41 min
Apr 28, 7:56 PM CDT	Special Weather Statement	TSA	Haskell, Latimer	49 min
Apr 28, 8:25 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, Latimer, LeFlore	50 min
Apr 28, 8:31 PM CDT	Flash Flood Warning	TSA	Haskell, Latimer, LeFlore, Pittsburg, Sequoyah	4 hr
Apr 28, 8:50 PM CDT	Tornado Warning	TSA	LeFlore	25 min
Apr 28, 9:14 PM CDT	Tornado Warning	TSA	LeFlore	31 min
Apr 28, 9:19 PM CDT	Areal Flood Advisory	TSA	LeFlore, Sequoyah	3 hr
Apr 28, 9:27 PM CDT	Flash Flood Warning	TSA	LeFlore, Sequoyah	3 hr
Apr 28, 10:21 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	28 min
Apr 28, 10:40 PM CDT	Flash Flood Warning	TSA	Adair, Sequoyah	4 hr
Apr 28, 10:58 PM CDT	Special Weather Statement	TSA	Choctaw	47 min
Apr 29, 12:04 AM CDT	Special Weather Statement	TSA	Pushmataha	26 min
Apr 29, 12:19 AM CDT	Flash Flood Warning	TSA	Haskell, Latimer, LeFlore, Muskogee, Pittsburg, Sequoyah	6 hr
Apr 29, 12:25 AM CDT	Special Weather Statement	TSA	Pittsburg	35 min
Apr 29, 12:54 AM CDT	Special Weather Statement	TSA	LeFlore	36 min
Apr 29, 1:47 AM CDT	Areal Flood Advisory	TSA	Choctaw, LeFlore, Pushmataha	4 hr
Apr 29, 1:49 AM CDT	Special Weather Statement	TSA	Choctaw	41 min
Apr 29, 2:35 AM CDT	Flash Flood Warning	TSA	Adair, Sequoyah	4 hr
Apr 29, 7:18 AM CDT	Areal Flood Warning	TSA	Choctaw, Haskell, Latimer, LeFlore, Pittsburg, Pushmataha and 1 more	10 hr
Apr 29, 10:56 AM CDT	River Flood Warning	TSA	Cherokee	4 hr
Apr 28, 7:22 PM CDT	Special Weather Statement	TSA	Franklin	23 min
Apr 28, 7:34 PM CDT	Severe Thunderstorm Warning	TSA	Franklin	26 min
Apr 28, 7:42 PM CDT	Areal Flood Warning	TSA	Benton, Carroll, Crawford, Franklin, Madison, Washington	9 hr
Apr 28, 9:27 PM CDT	Severe Thunderstorm Warning	TSA	Franklin, Sebastian	48 min
Apr 28, 9:29 PM CDT	Tornado Warning Considerable damage threat	TSA	Sebastian	28 min
Apr 29, 2:13 AM CDT	Special Weather Statement	TSA	Franklin	32 min
Apr 29, 11:36 AM CDT	River Flood Warning	TSA	Crawford, Franklin	9 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Severe Thunderstorm Warnings in Arkansas, 2021 Every severe thunderstorm warning in 2021

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.