Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 93, NWS Norman, OK

April 23, 20214 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 23, 2021, 4:30 PM CDT for 4 counties in Oklahoma. It was in force for 45 min. 1 report 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 23, 2021, 4:30 PM CDT (21:30 UTC)
Expired: Apr 23, 2021, 5:15 PM CDT
In force: 45 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Carter County, OK, Johnston County, OK, Love County, OK, Marshall County, OK

The radar

The Dallas/Ft Worth radar (KFWS), 152 km from the middle of the area, began a volume at 21:33 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 23, 4:37 PM CDT	HAIL 1	2 Nw Marietta, OK	MPING

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 23, 12:37 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 9.5 hours before the alert went out and 123 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: 14 J/kg
Mixed-layer CIN: -89 J/kg
Mixed-layer LCL: 578 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 397 m²/s²
0-3 km storm-relative helicity: 249 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.3

Open this sounding in Storm Lab

The text

As transmitted.

924 
WUUS54 KOUN 232130
SVROUN
OKC019-069-085-095-232215-
/O.NEW.KOUN.SV.W.0093.210423T2130Z-210423T2215Z/

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

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southwestern Johnston County in southeastern Oklahoma...
  Northeastern Love County in southern Oklahoma...
  Southeastern Carter County in southern Oklahoma...
  Northwestern Marshall County in southeastern Oklahoma...

* Until 515 PM CDT.

* At 430 PM CDT, a severe thunderstorm was located near Marietta,
  moving northeast at 55 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...
  Ardmore, Tishomingo, Marietta, Lone Grove, Dickson, Mannsville,
  Springer, Ravia, Gene Autry, Overbrook, Lake Murray, Burneyville,
  Russett and Oakland.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3384 9717 3390 9718 3392 9721 3390 9725
      3387 9726 3390 9737 3436 9715 3423 9667
      3394 9696 3394 9697 3396 9698 3395 9700
      3391 9699 3385 9705 3386 9707 3385 9709
      3384 9709 3384 9706 3382 9708
TIME...MOT...LOC 2130Z 207DEG 49KT 3393 9717 

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

JP

2 follow-up statements

269 
WWUS54 KOUN 232152
SVSOUN

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

OKC085-232202-
/O.CAN.KOUN.SV.W.0093.000000T0000Z-210423T2215Z/
Love OK-
452 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN LOVE 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 3408 9726 3436 9715 3423 9667 3409 9686
      3407 9692 3408 9699 3407 9710
TIME...MOT...LOC 2152Z 206DEG 47KT 3419 9701 

$$

OKC019-069-095-232215-
/O.CON.KOUN.SV.W.0093.000000T0000Z-210423T2215Z/
Johnston OK-Carter OK-Marshall OK-
452 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 515 PM CDT
FOR SOUTHWESTERN JOHNSTON...SOUTHEASTERN CARTER AND NORTHWESTERN
MARSHALL COUNTIES...

At 452 PM CDT, a severe thunderstorm was located over Dickson, moving
northeast at 55 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...
Ardmore, Tishomingo, Lone Grove, Dickson, Mannsville, Springer,
Ravia, Gene Autry, Russett and Lake Murray.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3408 9726 3436 9715 3423 9667 3409 9686
      3407 9692 3408 9699 3407 9710
TIME...MOT...LOC 2152Z 206DEG 47KT 3419 9701 

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

JP

492 
WWUS54 KOUN 232212
SVSOUN

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

OKC019-069-095-232221-
/O.EXP.KOUN.SV.W.0093.000000T0000Z-210423T2215Z/
Johnston OK-Carter OK-Marshall OK-
512 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JOHNSTON...
SOUTHEASTERN CARTER AND NORTHWESTERN MARSHALL COUNTIES WILL EXPIRE AT
515 PM CDT...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire.

LAT...LON 3408 9726 3436 9715 3423 9667 3409 9686
      3407 9692 3408 9699 3407 9710
TIME...MOT...LOC 2211Z 207DEG 49KT 3440 9688 

$$

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, 3:05 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Murray, Stephens	40 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, 4:32 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.