Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 581, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Dec 17, 2021, 3:18 PM CST for Cotton County, Jefferson County, Oklahoma; Clay County, Texas. It was in force for 42 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, 3:18 PM CST (21:18 UTC)
- Expired
- Dec 17, 2021, 4:00 PM CST
- In force
- 42 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cotton County, OK, Jefferson County, OK, Clay County, TX
The radar
The Altus AFB radar (KFDR), 83 km from the middle of the area, began a volume at 21:20 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 nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 9.3 hours before the alert went out and 158 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.
- 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
The text
As transmitted.
328
WUUS54 KOUN 172118
SVROUN
OKC033-067-TXC077-172200-
/O.NEW.KOUN.SV.W.0581.211217T2118Z-211217T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
318 PM CST Fri Dec 17 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Northwestern Jefferson County in southern Oklahoma...
Southeastern Cotton County in southwestern Oklahoma...
Northern Clay County in northern Texas...
* Until 400 PM CST.
* At 318 PM CST, a severe thunderstorm was located 5 miles east of
Dean, 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, Ryan, Petrolia, Byers, Dean, Addington, Sugden and
southeastern Waurika Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3395 9841 3429 9801 3429 9799 3409 9779
3381 9827
TIME...MOT...LOC 2118Z 229DEG 25KT 3393 9828
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Zwink1 follow-up statement
415
WWUS54 KOUN 172140
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
340 PM CST Fri Dec 17 2021
OKC033-172149-
/O.CAN.KOUN.SV.W.0581.000000T0000Z-211217T2200Z/
Cotton OK-
340 PM CST Fri Dec 17 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN COTTON COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3386 9825 3397 9834 3412 9819 3411 9817
3413 9815 3417 9814 3429 9801 3429 9799
3409 9779
TIME...MOT...LOC 2139Z 229DEG 25KT 3403 9814
$$
OKC067-TXC077-172200-
/O.CON.KOUN.SV.W.0581.000000T0000Z-211217T2200Z/
Jefferson OK-Clay TX-
340 PM CST Fri Dec 17 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 400 PM CST
FOR NORTHWESTERN JEFFERSON AND NORTHERN CLAY COUNTIES...
At 339 PM CST, a severe thunderstorm was located near Byers, 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, Ryan, Petrolia, Byers, Addington, Sugden and southeastern
Waurika Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3386 9825 3397 9834 3412 9819 3411 9817
3413 9815 3417 9814 3429 9801 3429 9799
3409 9779
TIME...MOT...LOC 2139Z 229DEG 25KT 3403 9814
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
ZwinkThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| 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, 3:58 PM CST | Severe Thunderstorm Warning | OUN | Jefferson, Stephens | 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 |
| Dec 17, 3:12 PM CST | Special Weather Statement | OUN | Clay | 33 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 |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 2021Severe Thunderstorm Warnings in Texas, 2021Every 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.