Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 593, NWS Norman, OK

December 17, 2021Hughes County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Dec 17, 2021, 6:40 PM CST for Hughes County, Oklahoma. It was in force for 18 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: Dec 17, 2021, 6:40 PM CST (00:40 UTC)
Expired: Dec 17, 2021, 6:58 PM CST
In force: 18 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Hughes County, OK

The radar

The Norman radar (KTLX), 112 km from the middle of the area, began a volume at 00:43 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

Fort Worth, TX (KFWD), launched 00:00Z, 0.7 hours before the alert went out and 266 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: 907 J/kg
Mixed-layer CIN: -61 J/kg
Mixed-layer LCL: 1218 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 138 m²/s²
0-3 km storm-relative helicity: 205 m²/s²
Significant tornado parameter: 0.5
Supercell composite: 2.4

Open this sounding in Storm Lab

The text

As transmitted.

274 
WUUS54 KOUN 180040
SVROUN
OKC063-180130-
/O.NEW.KOUN.SV.W.0593.211218T0040Z-211218T0130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
640 PM CST Fri Dec 17 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Southeastern Hughes County in southeastern Oklahoma...

* Until 730 PM CST.

* At 640 PM CST, a severe thunderstorm was located 4 miles northeast
  of Gerty, moving northeast at 40 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...
  Calvin, Stuart, Gerty and Atwood. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3511 9601 3509 9606 3506 9607 3505 9609
      3484 9609 3477 9628 3495 9636 3511 9604
TIME...MOT...LOC 0040Z 242DEG 35KT 3489 9625 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Zwink

1 follow-up statement

809 
WWUS54 KOUN 180058
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
658 PM CST Fri Dec 17 2021

OKC063-180108-
/O.CAN.KOUN.SV.W.0593.000000T0000Z-211218T0130Z/
Hughes OK-
658 PM CST Fri Dec 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HUGHES COUNTY IS
CANCELLED...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.  However heavy rain is
still possible with this thunderstorm.

LAT...LON 3511 9601 3509 9606 3506 9607 3505 9609
      3484 9609 3477 9628 3495 9636 3511 9604
TIME...MOT...LOC 0055Z 242DEG 35KT 3497 9606 

$$

Zwink

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 17, 6:04 PM CST	Special Weather Statement	OUN	Jefferson	26 min
Dec 17, 6:08 PM CST	Special Weather Statement	OUN	Pottawatomie	37 min
Dec 17, 6:10 PM CST	Special Weather Statement	OUN	Carter, Murray	35 min
Dec 17, 6:16 PM CST	Severe Thunderstorm Warning	OUN	Carter, Jefferson, Love	25 min
Dec 17, 6:30 PM CST	Severe Thunderstorm Warning	OUN	Carter, Johnston, Murray, Pontotoc	45 min
Dec 17, 7:10 PM CST	Special Weather Statement	OUN	Coal	35 min
Dec 17, 7:47 PM CST	Special Weather Statement	OUN	Cotton	28 min
Dec 17, 7:48 PM CST	Special Weather Statement	OUN	Coal	27 min
Dec 17, 8:16 PM CST	Special Weather Statement	OUN	Coal	14 min
Dec 17, 8:17 PM CST	Special Weather Statement	OUN	Stephens	28 min
Dec 17, 8:26 PM CST	Special Weather Statement	OUN	Cotton	34 min
Dec 17, 8:47 PM CST	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Murray, Stephens	27 min
Dec 17, 9:15 PM CST	Special Weather Statement	OUN	Murray	30 min
Dec 17, 9:16 PM CST	Special Weather Statement	OUN	Stephens	29 min
Dec 17, 9:47 PM CST	Special Weather Statement	OUN	Murray, Pontotoc	28 min
Dec 17, 10:18 PM CST	Special Weather Statement	OUN	Pontotoc	27 min
Dec 17, 10:34 PM CST	Areal Flood Advisory	OUN	Pontotoc	116 min
Dec 17, 10:56 PM CST	Special Weather Statement	OUN	Johnston, Marshall	34 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.