Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 522, NWS Norman, OK

October 12, 2021Beckham County, Greer County, Harmon County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 12, 2021, 5:37 PM CDT for Beckham County, Greer County, Harmon County, Oklahoma. It was in force for 38 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: Oct 12, 2021, 5:37 PM CDT (22:37 UTC)
Expired: Oct 12, 2021, 6:15 PM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Beckham County, OK, Greer County, OK, Harmon County, OK

The radar

The Altus AFB radar (KFDR), 113 km from the middle of the area, began a volume at 22:40 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
Oct 12, 5:34 PM CDT	Tornado Watch	SPC	5 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 10.6 hours before the alert went out and 189 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: 1866 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 399 m²/s²
0-3 km storm-relative helicity: 416 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

994 
WUUS54 KOUN 122237
SVROUN
OKC009-055-057-122315-
/O.NEW.KOUN.SV.W.0522.211012T2237Z-211012T2315Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
537 PM CDT Tue Oct 12 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northeastern Harmon County in southwestern Oklahoma...
  Northwestern Greer County in southwestern Oklahoma...
  Eastern Beckham County in western Oklahoma...

* Until 615 PM CDT.

* At 536 PM CDT, a severe thunderstorm was located 10 miles east of
  Vinson, moving north at 35 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is possible.

* Locations impacted include...
  Elk City, Sayre, Carter, Willow and Delhi. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3542 9969 3542 9957 3537 9936 3485 9960
      3490 9981
TIME...MOT...LOC 2236Z 196DEG 31KT 3495 9969 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BRB

3 follow-up statements

281 
WWUS54 KOUN 122242
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
542 PM CDT Tue Oct 12 2021

OKC009-055-057-122315-
/O.CON.KOUN.SV.W.0522.000000T0000Z-211012T2315Z/
Harmon OK-Greer OK-Beckham OK-
542 PM CDT Tue Oct 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR NORTHEASTERN HARMON...NORTHWESTERN GREER AND EASTERN BECKHAM
COUNTIES...

At 542 PM CDT, a severe thunderstorm was located 11 miles southwest
of Willow, moving north at 35 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Elk City, Sayre, Carter, Willow and Delhi. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3487 9959 3492 9981 3542 9969 3542 9957
      3537 9936
TIME...MOT...LOC 2242Z 197DEG 29KT 3497 9968 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BRB

931 
WWUS54 KOUN 122258
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
558 PM CDT Tue Oct 12 2021

OKC057-122308-
/O.CAN.KOUN.SV.W.0522.000000T0000Z-211012T2315Z/
Harmon OK-
558 PM CDT Tue Oct 12 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HARMON 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 3495 9955 3500 9975 3542 9964 3542 9957
      3537 9936
TIME...MOT...LOC 2258Z 202DEG 29KT 3508 9960 

$$

OKC009-055-122315-
/O.CON.KOUN.SV.W.0522.000000T0000Z-211012T2315Z/
Greer OK-Beckham OK-
558 PM CDT Tue Oct 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR NORTHWESTERN GREER AND EASTERN BECKHAM COUNTIES...

At 558 PM CDT, a severe thunderstorm was located 5 miles west of
Willow, moving north at 35 mph.

HAZARD...Two inch hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Elk City, Sayre, Carter, Willow, Delhi and Brinkman. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3495 9955 3500 9975 3542 9964 3542 9957
      3537 9936
TIME...MOT...LOC 2258Z 202DEG 29KT 3508 9960 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

BRB

397 
WWUS54 KOUN 122308
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
608 PM CDT Tue Oct 12 2021

OKC009-055-122315-
/O.CON.KOUN.SV.W.0522.000000T0000Z-211012T2315Z/
Greer OK-Beckham OK-
608 PM CDT Tue Oct 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR NORTH CENTRAL GREER AND EASTERN BECKHAM COUNTIES...

At 607 PM CDT, a severe thunderstorm was located 5 miles southwest of
Carter, moving north at 35 mph.

HAZARD...Ping pong 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 impacted include...
Elk City, Sayre, Carter and Delhi. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms.

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

&&

LAT...LON 3506 9950 3511 9972 3542 9964 3542 9957
      3537 9936
TIME...MOT...LOC 2307Z 196DEG 31KT 3516 9957 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

BRB

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 12, 10:46 AM CDT	Flood Watch	OUN	Atoka, Bryan, Coal, Johnston, Love, Marshall	41 hr
Oct 12, 12:36 PM CDT	Special Weather Statement	OUN	Alfalfa	24 min
Oct 12, 12:42 PM CDT	Special Weather Statement	OUN	Caddo	33 min
Oct 12, 1:08 PM CDT	Special Weather Statement	OUN	Canadian	37 min
Oct 12, 1:09 PM CDT	Special Weather Statement	OUN	Major	36 min
Oct 12, 1:28 PM CDT	Special Weather Statement	OUN	Alfalfa	17 min
Oct 12, 1:35 PM CDT	Special Weather Statement	OUN	Major	25 min
Oct 12, 1:42 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Major, Woods	48 min
Oct 12, 1:46 PM CDT	Special Weather Statement	OUN	Canadian	29 min
Oct 12, 1:50 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan	40 min
Oct 12, 2:33 PM CDT	Special Weather Statement	OUN	Logan	27 min
Oct 12, 3:03 PM CDT	Special Weather Statement	OUN	Noble	42 min
Oct 12, 3:42 PM CDT	Special Weather Statement	OUN	Kay	33 min
Oct 12, 4:14 PM CDT	Special Weather Statement	OUN	Kay	31 min
Oct 12, 5:03 PM CDT	Special Weather Statement	OUN	Harmon	27 min
Oct 12, 5:26 PM CDT	Special Weather Statement	OUN	Greer	34 min
Oct 12, 6:14 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	46 min
Oct 12, 6:18 PM CDT	Tornado Warning	OUN	Beckham, Greer, Kiowa, Washita	42 min
Oct 12, 6:21 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	39 min
Oct 12, 6:51 PM CDT	Tornado Warning	OUN	Beckham, Custer, Washita	24 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.