Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 43, NWS Tulsa, OK

April 9, 2021Adair County, Cherokee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 9, 2021, 8:49 PM CDT for Adair County, Cherokee County, Oklahoma. It was in force for 41 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 9, 2021, 8:49 PM CDT (01:49 UTC)
Expired: Apr 9, 2021, 9:30 PM CDT
In force: 41 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Adair County, OK, Cherokee County, OK

The radar

The Tulsa radar (KINX), 70 km from the middle of the area, began a volume at 01:53 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 9, 3:55 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 1.8 hours before the alert went out and 161 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: 9 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 1268 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 6 m²/s²
0-3 km storm-relative helicity: 182 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

759 
WUUS54 KTSA 100149
SVRTSA
OKC001-021-100230-
/O.NEW.KTSA.SV.W.0043.210410T0149Z-210410T0230Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
849 PM CDT Fri Apr 9 2021

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southwestern Adair County in northeastern Oklahoma...
  Southern Cherokee County in east central Oklahoma...

* Until 930 PM CDT.

* At 849 PM CDT, a severe thunderstorm was located 7 miles north of
  Pumpkin Center, moving east at 35 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations in or near the path include...
  Tahlequah...                      Bunch...
  Cookson...                        Eldon...
  Cherokee Landing State Park...    Christie...

LAT...LON 3564 9468 3572 9513 3581 9513 3581 9519
      3592 9517 3596 9465
TIME...MOT...LOC 0149Z 275DEG 31KT 3582 9511 

HAIL...1.25IN
WIND...60MPH
 
$$

2 follow-up statements

944 
WWUS54 KTSA 100159
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
859 PM CDT Fri Apr 9 2021

OKC001-021-100230-
/O.CON.KTSA.SV.W.0043.000000T0000Z-210410T0230Z/
Adair OK-Cherokee OK-
859 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR SOUTHWESTERN ADAIR AND SOUTHERN CHEROKEE COUNTIES...

At 859 PM CDT, a severe thunderstorm was located 7 miles southwest of
Tahlequah, moving east at 30 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations in or near the path include...
Tahlequah...                      Bunch...
Cookson...                        Eldon...
Cherokee Landing State Park...    Christie...

LAT...LON 3564 9468 3572 9513 3581 9513 3581 9519
      3592 9517 3596 9465
TIME...MOT...LOC 0159Z 274DEG 28KT 3582 9504 

HAIL...1.25IN
WIND...60MPH
 
$$

295 
WWUS54 KTSA 100213
SVSTSA

Severe Weather Statement
National Weather Service Tulsa OK
913 PM CDT Fri Apr 9 2021

OKC001-021-100230-
/O.CON.KTSA.SV.W.0043.000000T0000Z-210410T0230Z/
Adair OK-Cherokee OK-
913 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 930 PM CDT
FOR SOUTHWESTERN ADAIR AND SOUTHEASTERN CHEROKEE COUNTIES...

At 913 PM CDT, a severe thunderstorm was located 3 miles north of
Cherokee Landing State Park, moving east at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations in or near the path include...
Tahlequah...                      Bunch...
Cookson...                        Eldon...
Cherokee Landing State Park...    Christie...

LAT...LON 3571 9506 3593 9500 3596 9465 3564 9468
TIME...MOT...LOC 0213Z 275DEG 31KT 3581 9489 

HAIL...1.00IN
WIND...60MPH
 
$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 7:02 PM CDT	Special Weather Statement	TSA	Rogers	28 min
Apr 9, 7:09 PM CDT	Severe Thunderstorm Warning	TSA	Okfuskee	51 min
Apr 9, 7:12 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Okfuskee	48 min
Apr 9, 7:24 PM CDT	Special Weather Statement	TSA	Tulsa	36 min
Apr 9, 7:29 PM CDT	Special Weather Statement	TSA	Ottawa	31 min
Apr 9, 7:38 PM CDT	Special Weather Statement	TSA	Craig, Nowata	37 min
Apr 9, 7:38 PM CDT	Severe Thunderstorm Warning	TSA	Creek, Muskogee, Okmulgee, Rogers, Tulsa, Wagoner	52 min
Apr 9, 7:41 PM CDT	Tornado Warning	TSA	Creek, Tulsa	20 min
Apr 9, 7:52 PM CDT	Special Weather Statement	TSA	Cherokee, Mayes	23 min
Apr 9, 7:56 PM CDT	Special Weather Statement	TSA	Okfuskee	34 min
Apr 9, 8:02 PM CDT	Severe Thunderstorm Warning	TSA	Delaware	29 min
Apr 9, 8:28 PM CDT	Special Weather Statement	TSA	Cherokee, Mayes	32 min
Apr 9, 8:29 PM CDT	Severe Thunderstorm Warning	TSA	Pittsburg	46 min
Apr 9, 8:59 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, Pittsburg, Pushmataha	50 min
Apr 9, 9:03 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, McIntosh, Muskogee, Sequoyah	42 min
Apr 9, 9:24 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, Pushmataha	66 min
Apr 9, 9:27 PM CDT	Severe Thunderstorm Warning	TSA	Adair, Cherokee, Sequoyah	48 min
Apr 9, 9:30 PM CDT	Special Weather Statement	TSA	Muskogee	30 min
Apr 9, 9:35 PM CDT	Severe Thunderstorm Warning	TSA	Latimer, LeFlore, Pushmataha	55 min
Apr 9, 9:37 PM CDT	Severe Thunderstorm Warning	TSA	Haskell, LeFlore, Muskogee, Sequoyah	38 min
Apr 9, 9:58 PM CDT	Severe Thunderstorm Warning	TSA	Choctaw, LeFlore, Pushmataha	47 min
Apr 9, 10:24 PM CDT	Special Weather Statement	TSA	LeFlore	36 min
Apr 9, 10:33 PM CDT	Severe Thunderstorm Warning	TSA	LeFlore, Sequoyah	42 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.