Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 37, NWS Tulsa, OK

April 9, 2021Osage County, Tulsa County, Washington County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 9, 2021, 6:29 PM CDT for Osage County, Tulsa County, Washington County, Oklahoma. It was in force for 46 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, 6:29 PM CDT (23:29 UTC)
Expired: Apr 9, 2021, 7:15 PM CDT
In force: 46 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Osage County, OK, Tulsa County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 40 km from the middle of the area, began a volume at 23:30 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

Norman, OK (KOUN), launched 12:00Z, 11.5 hours before the alert went out and 185 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: 1068 J/kg
Mixed-layer CIN: -311 J/kg
Mixed-layer LCL: 1414 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.6

Open this sounding in Storm Lab

The text

As transmitted.

979 
WUUS54 KTSA 092329
SVRTSA
OKC113-143-147-100015-
/O.NEW.KTSA.SV.W.0037.210409T2329Z-210410T0015Z/

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

The National Weather Service in Tulsa has issued a

* Severe Thunderstorm Warning for...
  Southeastern Osage County in northeastern Oklahoma...
  Southwestern Washington County in northeastern Oklahoma...
  Northeastern Tulsa County in northeastern Oklahoma...

* Until 715 PM CDT.

* At 629 PM CDT, severe thunderstorms were located along a line
  extending from 8 miles southwest of Barnsdall to 6 miles west of
  Sperry to 4 miles east of Walnut Creek State Park, moving east at
  30 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...
  Tulsa...                          Owasso...
  Skiatook...                       Collinsville...
  Sperry...                         Avant...
  Vera...                           Turley...
  Tulsa International Airport...    

LAT...LON 3645 9581 3642 9581 3642 9580 3639 9580
      3639 9581 3618 9582 3619 9625 3629 9619
      3646 9631 3653 9588
TIME...MOT...LOC 2329Z 262DEG 25KT 3646 9623 3630 9610 3623 9620 

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

2 follow-up statements

857 
WWUS54 KTSA 092345
SVSTSA

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

OKC113-143-147-100015-
/O.CON.KTSA.SV.W.0037.000000T0000Z-210410T0015Z/
Osage OK-Washington OK-Tulsa OK-
645 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR SOUTHEASTERN OSAGE...SOUTHWESTERN WASHINGTON AND NORTHEASTERN
TULSA COUNTIES...

At 645 PM CDT, severe thunderstorms were located along a line
extending from 2 miles south of Avant to near Sperry to 5 miles west
of Turley, moving east at 30 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...
Tulsa...                          Owasso...
Skiatook...                       Collinsville...
Sperry...                         Avant...
Vera...                           Turley...
Tulsa International Airport...    

LAT...LON 3645 9581 3642 9581 3642 9580 3639 9580
      3639 9581 3618 9582 3619 9617 3637 9613
      3649 9610 3653 9588
TIME...MOT...LOC 2345Z 261DEG 25KT 3646 9606 3631 9597 3624 9607 

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

833 
WWUS54 KTSA 100006
SVSTSA

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

OKC113-143-147-100015-
/O.EXP.KTSA.SV.W.0037.000000T0000Z-210410T0015Z/
Osage OK-Washington OK-Tulsa OK-
706 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN OSAGE...
SOUTHWESTERN WASHINGTON AND NORTHEASTERN TULSA COUNTIES WILL EXPIRE
AT 715 PM CDT...
    
The storms which prompted the warning have weakened below severe 
limits, and have started exiting the warned area. Therefore the 
warning will be allowed to expire.  However gusty winds and heavy 
rain are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
northeastern Oklahoma.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Tulsa.

LAT...LON 3645 9581 3642 9581 3642 9580 3639 9580
      3639 9581 3618 9582 3619 9617 3637 9613
      3649 9610 3653 9588
TIME...MOT...LOC 0005Z 262DEG 25KT 3648 9590 3633 9581 3626 9591 

$$

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 3:08 PM CDT	Special Weather Statement	TSA	Ottawa	37 min
Apr 9, 3:18 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Ottawa	42 min
Apr 9, 3:51 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Rogers, Tulsa, Washington	39 min
Apr 9, 3:53 PM CDT	Special Weather Statement	TSA	Ottawa	22 min
Apr 9, 4:01 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	44 min
Apr 9, 4:18 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata, Rogers	42 min
Apr 9, 4:19 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata, Rogers	41 min
Apr 9, 4:32 PM CDT	Severe Thunderstorm Warning	TSA	Pawnee	43 min
Apr 9, 4:45 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	45 min
Apr 9, 4:56 PM CDT	Severe Thunderstorm Warning	TSA	Craig, Nowata	14 min
Apr 9, 5:07 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	38 min
Apr 9, 5:13 PM CDT	Special Weather Statement	TSA	Osage	32 min
Apr 9, 5:22 PM CDT	Severe Thunderstorm Warning	TSA	Osage	53 min
Apr 9, 5:33 PM CDT	Wind Advisory	TSA	Craig, Creek, Mayes, Nowata, Okfuskee, Okmulgee and 5 more	5 hr
Apr 9, 5:46 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	44 min
Apr 9, 5:47 PM CDT	Severe Thunderstorm Warning	TSA	Nowata, Rogers	43 min
Apr 9, 5:47 PM CDT	Severe Thunderstorm Warning	TSA	Osage	43 min
Apr 9, 5:59 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee	46 min
Apr 9, 6:09 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Pawnee, Washington	51 min
Apr 9, 6:26 PM CDT	Special Weather Statement	TSA	Nowata	34 min
Apr 9, 6:47 PM CDT	Special Weather Statement	TSA	Craig	28 min
Apr 9, 6:55 PM CDT	Special Weather Statement	TSA	Creek	35 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.