Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 35, NWS Tulsa, OK

April 9, 2021Osage County, Pawnee County, Oklahoma

NWS Tulsa, OK issued this severe thunderstorm warning at Apr 9, 2021, 5:59 PM CDT for Osage County, Pawnee 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, 5:59 PM CDT (22:59 UTC)
Expired: Apr 9, 2021, 6:45 PM CDT
In force: 46 min
Issued by: NWS Tulsa, OK
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Osage County, OK, Pawnee County, OK

The radar

The Tulsa radar (KINX), 66 km from the middle of the area, began a volume at 23:02 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, 11.0 hours before the alert went out and 166 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.

773 
WUUS54 KTSA 092259
SVRTSA
OKC113-117-092345-
/O.NEW.KTSA.SV.W.0035.210409T2259Z-210409T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tulsa OK
559 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...
  Southeastern Pawnee County in northeastern Oklahoma...

* Until 645 PM CDT.

* At 559 PM CDT, severe thunderstorms were located along a line
  extending from near Hominy to 3 miles northwest of Westport, moving
  east at 25 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations in or near the path include...
  Tulsa...                          Hominy...
  Cleveland...                      Westport...
  Osage...                          Walnut Creek State Park...

LAT...LON 3655 9614 3621 9604 3618 9644 3647 9651
TIME...MOT...LOC 2259Z 263DEG 20KT 3642 9643 3624 9638 

HAIL...1.75IN
WIND...60MPH
 
$$

1 follow-up statement

002 
WWUS54 KTSA 092324
SVSTSA

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

OKC117-092334-
/O.CAN.KTSA.SV.W.0035.000000T0000Z-210409T2345Z/
Pawnee OK-
624 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN PAWNEE COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area therefore the warning has been cancelled.

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

LAT...LON 3655 9614 3621 9604 3620 9624 3621 9624
      3623 9626 3623 9628 3651 9633
TIME...MOT...LOC 2324Z 263DEG 20KT 3644 9627 3626 9622 

$$

OKC113-092345-
/O.CON.KTSA.SV.W.0035.000000T0000Z-210409T2345Z/
Osage OK-
624 PM CDT Fri Apr 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTHEASTERN OSAGE COUNTY...

At 624 PM CDT, severe thunderstorms were located along a line
extending from 7 miles east of Hominy to 3 miles east of Walnut Creek
State Park, moving east at 25 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...                          Walnut Creek State Park...

LAT...LON 3655 9614 3621 9604 3620 9624 3621 9624
      3623 9626 3623 9628 3651 9633
TIME...MOT...LOC 2324Z 263DEG 20KT 3644 9627 3626 9622 

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, 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, 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, 6:29 PM CDT	Severe Thunderstorm Warning	TSA	Osage, Tulsa, Washington	46 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.