Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 9, NWS Norman, OK

March 12, 2021Beckham County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 12, 2021, 5:30 PM CST for Beckham County, Oklahoma. It was in force for 45 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: Mar 12, 2021, 5:30 PM CST (23:30 UTC)
Expired: Mar 12, 2021, 6:15 PM CST
In force: 45 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Beckham County, OK

The radar

The Altus AFB radar (KFDR), 112 km from the middle of the area, began a volume at 23:30 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 11.5 hours before the alert went out and 188 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: 66 J/kg
Mixed-layer CIN: -163 J/kg
Mixed-layer LCL: 619 m above ground
0-6 km bulk shear: 81 kt
0-1 km storm-relative helicity: 345 m²/s²
0-3 km storm-relative helicity: 390 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.4

Open this sounding in Storm Lab

The text

As transmitted.

427 
WUUS54 KOUN 122330
SVROUN
OKC009-130015-
/O.NEW.KOUN.SV.W.0009.210312T2330Z-210313T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
530 PM CST Fri Mar 12 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Central Beckham County in western Oklahoma...

* Until 615 PM CST.

* At 530 PM CST, a severe thunderstorm was located near Delhi, moving
  northeast at 25 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...
  Sayre, Carter and Delhi. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3512 9978 3520 9984 3538 9955 3529 9944
      3516 9939
TIME...MOT...LOC 2330Z 242DEG 20KT 3518 9972 

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

Mahale

2 follow-up statements

078 
WWUS54 KOUN 122343
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
543 PM CST Fri Mar 12 2021

OKC009-130015-
/O.CON.KOUN.SV.W.0009.000000T0000Z-210313T0015Z/
Beckham OK-
543 PM CST Fri Mar 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CST
FOR SOUTHEASTERN BECKHAM COUNTY...

At 542 PM CST, a severe thunderstorm was located near Delhi, moving
northeast at 25 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...
Sayre, Carter and Delhi. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3514 9971 3520 9973 3538 9955 3529 9944
      3520 9941
TIME...MOT...LOC 2342Z 242DEG 20KT 3521 9964 

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

Mahale

491 
WWUS54 KOUN 122350
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
550 PM CST Fri Mar 12 2021

OKC009-130015-
/O.CON.KOUN.SV.W.0009.000000T0000Z-210313T0015Z/
Beckham OK-
550 PM CST Fri Mar 12 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CST
FOR EAST CENTRAL BECKHAM COUNTY...

At 549 PM CST, a severe thunderstorm was located 5 miles west of
Carter, moving northeast at 25 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Broadcast media reported quarter size hail south of Sayre.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

Locations impacted include...
Carter.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3518 9964 3523 9967 3538 9955 3529 9944
      3522 9942
TIME...MOT...LOC 2349Z 242DEG 20KT 3523 9959 

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

Mahale

The office that day

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

Issued	Product	Office	Counties	Lasted
Mar 12, 8:05 AM CST	Special Weather Statement	OUN	Woods	25 min
Mar 12, 8:27 AM CST	Special Weather Statement	OUN	Alfalfa	18 min
Mar 12, 8:38 AM CST	Severe Thunderstorm Warning	OUN	Alfalfa	22 min
Mar 12, 8:50 AM CST	Special Weather Statement	OUN	Woods	25 min
Mar 12, 2:06 PM CST	Flood Watch	OUN	Canadian, Garfield, Grant, Kay, Kingfisher, Lincoln and 4 more	16 hr
Mar 12, 4:57 PM CST	Special Weather Statement	OUN	Beckham	33 min
Mar 12, 5:14 PM CST	Special Weather Statement	OUN	Beckham	31 min
Mar 12, 5:20 PM CST	Special Weather Statement	OUN	Roger Mills	25 min
Mar 12, 5:37 PM CST	Special Weather Statement	OUN	Custer	38 min
Mar 12, 5:50 PM CST	Special Weather Statement	OUN	Custer	25 min
Mar 12, 5:55 PM CST	Severe Thunderstorm Warning	OUN	Beckham, Washita	37 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.