Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 583, NWS Norman, OK

December 17, 2021Clay County, Texas; Jefferson County, Stephens County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Dec 17, 2021, 3:58 PM CST for Clay County, Texas; Jefferson County, Stephens County, Oklahoma. It was in force for 47 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 17, 2021, 3:58 PM CST (21:58 UTC)
Expired: Dec 17, 2021, 4:45 PM CST
In force: 47 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Jefferson County, OK, Stephens County, OK, Clay County, TX

The radar

The Altus AFB radar (KFDR), 103 km from the middle of the area, began a volume at 22:00 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.

What was reported inside it

Time	Report	Where	Remark
Dec 17, 4:45 PM CST	TSTM WND DMG	10 W Ringling, OK	AT LEAST 6 POWER POLES DOWN ALONG US 70. TIME ESTIMATED FROM RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Fort Worth, TX (KFWD), launched 12:00Z, 10.0 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: 808 J/kg
Mixed-layer CIN: -56 J/kg
Mixed-layer LCL: 575 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 300 m²/s²
0-3 km storm-relative helicity: 300 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.3

Open this sounding in Storm Lab

The text

As transmitted.

634 
WUUS54 KOUN 172158
SVROUN
OKC067-137-TXC077-172245-
/O.NEW.KOUN.SV.W.0583.211217T2158Z-211217T2245Z/

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

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Northern Jefferson County in southern Oklahoma...
  Southeastern Stephens County in southern Oklahoma...
  Northeastern Clay County in northern Texas...

* Until 445 PM CST.

* At 358 PM CST, a severe thunderstorm was located near Sugden,
  moving northeast at 30 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...
  Waurika, Loco, Addington and Sugden. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3409 9816 3448 9775 3432 9756 3427 9756
      3398 9805
TIME...MOT...LOC 2158Z 226DEG 28KT 3408 9803 

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

$$

Zwink

1 follow-up statement

965 
WWUS54 KOUN 172234
SVSOUN

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

TXC077-172243-
/O.CAN.KOUN.SV.W.0583.000000T0000Z-211217T2245Z/
Clay TX-
434 PM CST Fri Dec 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CLAY 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 3448 9775 3432 9756 3427 9756 3406 9791
      3430 9794
TIME...MOT...LOC 2233Z 226DEG 28KT 3427 9779 

$$

OKC067-137-172245-
/O.CON.KOUN.SV.W.0583.000000T0000Z-211217T2245Z/
Jefferson OK-Stephens OK-
434 PM CST Fri Dec 17 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CST
FOR NORTHEASTERN JEFFERSON AND SOUTHEASTERN STEPHENS COUNTIES...

At 433 PM CST, a severe thunderstorm was located 7 miles southwest of
Loco, moving northeast at 30 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...
Loco.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 3448 9775 3432 9756 3427 9756 3406 9791
      3430 9794
TIME...MOT...LOC 2233Z 226DEG 28KT 3427 9779 

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

$$

Zwink

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 17, 3:12 PM CST	Special Weather Statement	OUN	Clay	33 min
Dec 17, 3:18 PM CST	Severe Thunderstorm Warning	OUN	Clay	42 min
Dec 17, 4:14 PM CST	Special Weather Statement	OUN	Archer	31 min
Dec 17, 4:46 PM CST	Special Weather Statement	OUN	Clay	29 min
Dec 17, 7:42 AM CST	Special Weather Statement	OUN	Garvin	33 min
Dec 17, 2:47 PM CST	Special Weather Statement	OUN	Garvin	28 min
Dec 17, 3:06 PM CST	Special Weather Statement	OUN	Seminole	24 min
Dec 17, 3:16 PM CST	Special Weather Statement	OUN	Pontotoc	29 min
Dec 17, 3:28 PM CST	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	47 min
Dec 17, 4:10 PM CST	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	50 min
Dec 17, 4:22 PM CST	Severe Thunderstorm Warning	OUN	Jefferson, Stephens	23 min
Dec 17, 4:31 PM CST	Special Weather Statement	OUN	Murray	29 min
Dec 17, 4:41 PM CST	Severe Thunderstorm Warning	OUN	Carter, Jefferson	49 min
Dec 17, 5:02 PM CST	Special Weather Statement	OUN	Hughes	28 min
Dec 17, 5:04 PM CST	Special Weather Statement	OUN	Murray	26 min
Dec 17, 5:14 PM CST	Severe Thunderstorm Warning	OUN	Garvin, Murray, Pontotoc	46 min
Dec 17, 5:22 PM CST	Special Weather Statement	OUN	McClain	23 min
Dec 17, 5:27 PM CST	Severe Thunderstorm Warning	OUN	Carter, Murray	48 min
Dec 17, 5:34 PM CST	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain	41 min
Dec 17, 5:37 PM CST	Special Weather Statement	OUN	Jefferson	23 min
Dec 17, 5:42 PM CST	Special Weather Statement	OUN	Hughes	33 min
Dec 17, 5:57 PM CST	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc, Seminole	48 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Severe Thunderstorm Warnings in Texas, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.