Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 66, NWS Norman, OK

April 9, 2021Logan County, Noble County, Payne County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Apr 9, 2021, 5:17 PM CDT for Logan County, Noble County, Payne County, Oklahoma. It was in force for 43 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, 5:17 PM CDT (22:17 UTC)
Expired: Apr 9, 2021, 6:00 PM CDT
In force: 43 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Logan County, OK, Noble County, OK, Payne County, OK

The radar

The Norman radar (KTLX), 87 km from the middle of the area, began a volume at 22:20 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, 10.3 hours before the alert went out and 101 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.

861 
WUUS54 KOUN 092217
SVROUN
OKC083-103-119-092300-
/O.NEW.KOUN.SV.W.0066.210409T2217Z-210409T2300Z/

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

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southern Noble County in northern Oklahoma...
  North central Logan County in central Oklahoma...
  Northwestern Payne County in central Oklahoma...

* Until 600 PM CDT.

* At 517 PM CDT, a severe thunderstorm was located near Orlando,
  moving east at 25 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Stillwater, Mulhall, Orlando, Lake Carl Blackwell and Lake
  Mcmurtry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3604 9747 3622 9746 3626 9697 3603 9698
TIME...MOT...LOC 2217Z 264DEG 20KT 3613 9737 

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

Mahale

1 follow-up statement

240 
WWUS54 KOUN 092252
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
552 PM CDT Fri Apr 9 2021

OKC083-103-119-092302-
/O.EXP.KOUN.SV.W.0066.000000T0000Z-210409T2300Z/
Noble OK-Logan OK-Payne OK-
552 PM CDT Fri Apr 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN NOBLE...NORTH CENTRAL
LOGAN AND NORTHWESTERN PAYNE COUNTIES WILL EXPIRE AT 600 PM CDT...
                 
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire.  However
small hail and heavy rain are still possible with this thunderstorm.

Remember, a Severe Thunderstorm Warning still remains in effect for
southern Payne County. 

LAT...LON 3604 9747 3622 9746 3626 9697 3603 9698
TIME...MOT...LOC 2252Z 264DEG 20KT 3615 9713 

$$

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 9, 2:57 AM CDT	Wind Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 31 more	20 hr
Apr 9, 10:21 AM CDT	Special Weather Statement	OUN	Bryan	24 min
Apr 9, 10:32 AM CDT	Special Weather Statement	OUN	Bryan	28 min
Apr 9, 3:21 PM CDT	Special Weather Statement	OUN	Greer	24 min
Apr 9, 3:28 PM CDT	Severe Thunderstorm Warning	OUN	Greer	23 min
Apr 9, 3:35 PM CDT	Special Weather Statement	OUN	Washita	40 min
Apr 9, 3:39 PM CDT	Special Weather Statement	OUN	Kingfisher	36 min
Apr 9, 3:49 PM CDT	Special Weather Statement	OUN	Canadian	26 min
Apr 9, 3:52 PM CDT	Special Weather Statement	OUN	Greer	23 min
Apr 9, 3:57 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	48 min
Apr 9, 4:12 PM CDT	Special Weather Statement	OUN	Logan	33 min
Apr 9, 4:13 PM CDT	Special Weather Statement	OUN	Washita	32 min
Apr 9, 4:23 PM CDT	Special Weather Statement	OUN	Grant	37 min
Apr 9, 4:25 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	50 min
Apr 9, 4:29 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	16 min
Apr 9, 4:36 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady	39 min
Apr 9, 4:52 PM CDT	Special Weather Statement	OUN	Kingfisher	23 min
Apr 9, 4:53 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher	52 min
Apr 9, 5:06 PM CDT	Severe Thunderstorm Warning	OUN	Grady	39 min
Apr 9, 5:18 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Logan, Oklahoma	42 min
Apr 9, 5:25 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	50 min
Apr 9, 5:31 PM CDT	Severe Thunderstorm Warning	OUN	Grady, McClain	44 min
Apr 9, 5:36 PM CDT	Special Weather Statement	OUN	Pottawatomie	24 min
Apr 9, 5:39 PM CDT	Special Weather Statement	OUN	Lincoln	36 min
Apr 9, 5:48 PM CDT	Special Weather Statement	OUN	Lincoln	27 min
Apr 9, 5:51 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	39 min
Apr 9, 5:57 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	48 min
Apr 9, 6:05 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady, McClain, Stephens	40 min
Apr 9, 6:09 PM CDT	Special Weather Statement	OUN	Lincoln	36 min
Apr 9, 6:22 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	27 min
Apr 9, 6:34 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln	56 min
Apr 9, 6:38 PM CDT	Special Weather Statement	OUN	Pottawatomie	52 min
Apr 9, 6:58 PM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	47 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.