Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 92, NWS Norman, OK

April 23, 20215 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 23, 2021, 3:05 PM CDT for 5 counties in Oklahoma. It was in force for 40 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 23, 2021, 3:05 PM CDT (20:05 UTC)
Expired: Apr 23, 2021, 3:45 PM CDT
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carter County, OK, Garvin County, OK, Jefferson County, OK, Murray County, OK, Stephens County, OK

The radar

The Norman radar (KTLX), 106 km from the middle of the area, began a volume at 20:09 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 23, 12:37 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 8.1 hours before the alert went out and 91 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 751 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 284 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

769 
WUUS54 KOUN 232005
SVROUN
OKC019-049-067-099-137-232045-
/O.NEW.KOUN.SV.W.0092.210423T2005Z-210423T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
305 PM CDT Fri Apr 23 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northeastern Jefferson County in southern Oklahoma...
  Southwestern Garvin County in southern Oklahoma...
  Eastern Stephens County in southern Oklahoma...
  Northwestern Carter County in southern Oklahoma...
  Southwestern Murray County in southern Oklahoma...

* Until 345 PM CDT.

* At 305 PM CDT, a severe thunderstorm was located 4 miles northwest
  of Ringling, moving northeast at 50 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 impacted include...
  Healdton, Wilson, Ringling, Velma, Tatums, Loco, Ratliff City,
  Graham, Pooleville, Milo, Cornish, Fox and Pernell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3425 9783 3468 9772 3468 9767 3470 9767
      3435 9715 3408 9762
TIME...MOT...LOC 2005Z 224DEG 44KT 3422 9766 

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

JP

2 follow-up statements

885 
WWUS54 KOUN 232024
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
324 PM CDT Fri Apr 23 2021

OKC067-232033-
/O.CAN.KOUN.SV.W.0092.000000T0000Z-210423T2045Z/
Jefferson OK-
324 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN JEFFERSON COUNTY
IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3446 9774 3468 9772 3468 9767 3470 9767
      3435 9715 3428 9748
TIME...MOT...LOC 2023Z 217DEG 45KT 3445 9753 

$$

OKC019-049-099-137-232045-
/O.CON.KOUN.SV.W.0092.000000T0000Z-210423T2045Z/
Garvin OK-Stephens OK-Carter OK-Murray OK-
324 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR SOUTHWESTERN GARVIN...NORTHEASTERN STEPHENS...NORTHWESTERN CARTER
AND SOUTHWESTERN MURRAY COUNTIES...

At 323 PM CDT, a severe thunderstorm was located over Ratliff City,
moving northeast at 50 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 impacted include...
Velma, Tatums, Ratliff City, Graham, Pooleville, Milo, Pernell and
Fox.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3446 9774 3468 9772 3468 9767 3470 9767
      3435 9715 3428 9748
TIME...MOT...LOC 2023Z 217DEG 45KT 3445 9753 

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

JP

808 
WWUS54 KOUN 232036
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
336 PM CDT Fri Apr 23 2021

OKC019-049-099-137-232046-
/O.EXP.KOUN.SV.W.0092.000000T0000Z-210423T2045Z/
Garvin OK-Stephens OK-Carter OK-Murray OK-
336 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GARVIN...
NORTHEASTERN STEPHENS...NORTHWESTERN CARTER AND SOUTHWESTERN MURRAY
COUNTIES WILL EXPIRE AT 345 PM CDT...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire.

LAT...LON 3446 9774 3468 9772 3468 9767 3470 9767
      3435 9715 3428 9748
TIME...MOT...LOC 2036Z 224DEG 44KT 3453 9744 

$$

JP

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 23, 1:21 PM CDT	Special Weather Statement	OUN	Cotton	24 min
Apr 23, 1:23 PM CDT	Special Weather Statement	OUN	Comanche	37 min
Apr 23, 1:45 PM CDT	Special Weather Statement	OUN	Stephens	30 min
Apr 23, 1:49 PM CDT	Special Weather Statement	OUN	Grady	26 min
Apr 23, 2:18 PM CDT	Special Weather Statement	OUN	McClain	27 min
Apr 23, 2:44 PM CDT	Special Weather Statement	OUN	Jefferson	31 min
Apr 23, 2:46 PM CDT	Special Weather Statement	OUN	McClain	29 min
Apr 23, 3:21 PM CDT	Special Weather Statement	OUN	Love	24 min
Apr 23, 3:47 PM CDT	Special Weather Statement	OUN	Garvin, McClain	28 min
Apr 23, 3:47 PM CDT	Special Weather Statement	OUN	Blaine	28 min
Apr 23, 3:50 PM CDT	Special Weather Statement	OUN	Marshall	25 min
Apr 23, 4:18 PM CDT	Special Weather Statement	OUN	Love	27 min
Apr 23, 4:30 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Love, Marshall	45 min
Apr 23, 4:32 PM CDT	Special Weather Statement	OUN	Kingfisher	28 min
Apr 23, 4:33 PM CDT	Special Weather Statement	OUN	Oklahoma	27 min
Apr 23, 4:42 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Grady, Oklahoma	33 min
Apr 23, 5:03 PM CDT	Special Weather Statement	OUN	Noble	27 min
Apr 23, 5:14 PM CDT	Special Weather Statement	OUN	Logan	31 min
Apr 23, 5:59 PM CDT	Special Weather Statement	OUN	Garfield	31 min
Apr 23, 6:13 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Garfield, Grant	47 min
Apr 23, 6:18 PM CDT	Special Weather Statement	OUN	Garfield	27 min
Apr 23, 6:30 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Kiowa, Tillman	45 min
Apr 23, 6:32 PM CDT	Special Weather Statement	OUN	Harmon	28 min
Apr 23, 6:58 PM CDT	Special Weather Statement	OUN	Grant	32 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.