Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 101, NWS Norman, OK

April 23, 2021Alfalfa County, Garfield County, Grant County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 23, 2021, 6:13 PM CDT for Alfalfa County, Garfield County, Grant County, Oklahoma. It was in force for 47 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, 6:13 PM CDT (23:13 UTC)
Expired: Apr 23, 2021, 7:00 PM CDT
In force: 47 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Alfalfa County, OK, Garfield County, OK, Grant County, OK

The radar

The Vance AFB radar (KVNX), 21 km from the middle of the area, began a volume at 23:13 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 11.2 hours before the alert went out and 162 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.

416 
WUUS54 KOUN 232313
SVROUN
OKC003-047-053-240000-
/O.NEW.KOUN.SV.W.0101.210423T2313Z-210424T0000Z/

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

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southeastern Alfalfa County in northwestern Oklahoma...
  Southwestern Grant County in northern Oklahoma...
  Northwestern Garfield County in northern Oklahoma...

* Until 700 PM CDT.

* At 612 PM CDT, a severe thunderstorm was located near Hillsdale,
  moving northeast at 30 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Pond Creek, Goltry, Nash, Hillsdale, Carrier and Jefferson. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3645 9801 3653 9817 3686 9800 3670 9767
TIME...MOT...LOC 2312Z 215DEG 27KT 3655 9803 

HAIL...1.00IN
WIND...<50MPH
 
$$

JP

2 follow-up statements

346 
WWUS54 KOUN 232333
SVSOUN

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

OKC003-047-232342-
/O.CAN.KOUN.SV.W.0101.000000T0000Z-210424T0000Z/
Alfalfa OK-Garfield OK-
633 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN ALFALFA AND
NORTHWESTERN GARFIELD COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 3660 9785 3660 9810 3686 9800 3670 9767
TIME...MOT...LOC 2332Z 214DEG 29KT 3670 9790 

$$

OKC053-240000-
/O.CON.KOUN.SV.W.0101.000000T0000Z-210424T0000Z/
Grant OK-
633 PM CDT Fri Apr 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR SOUTHWESTERN GRANT COUNTY...

At 632 PM CDT, a severe thunderstorm was located 5 miles northwest of
Pond Creek, moving northeast at 35 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Pond Creek, Nash and Jefferson. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3660 9785 3660 9810 3686 9800 3670 9767
TIME...MOT...LOC 2332Z 214DEG 29KT 3670 9790 

HAIL...1.00IN
WIND...<50MPH
 
$$

JP

658 
WWUS54 KOUN 240000
SVSOUN

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

OKC053-240009-
/O.EXP.KOUN.SV.W.0101.000000T0000Z-210424T0000Z/
Grant OK-
700 PM CDT Fri Apr 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GRANT COUNTY WILL
EXPIRE AT 700 PM CDT...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire.

LAT...LON 3660 9785 3660 9810 3686 9800 3670 9767
TIME...MOT...LOC 2359Z 215DEG 27KT 3685 9777 

$$

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, 4:30 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, 6:18 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.