Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 577, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Nov 10, 2021, 6:42 PM CST for Jefferson County, Oklahoma; Clay County, Texas. It was in force for 21 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
- Nov 10, 2021, 6:42 PM CST (00:42 UTC)
- Expired
- Nov 10, 2021, 7:03 PM CST
- In force
- 21 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Jefferson County, OK, Clay County, TX
The radar
The Altus AFB radar (KFDR), 108 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Nov 10, 3:26 PM CST | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Fort Worth, TX (KFWD), launched 00:00Z, 0.7 hours before the alert went out and 132 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
- 1140 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1186 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 238 m²/s²
- 0-3 km storm-relative helicity
- 243 m²/s²
- Significant tornado parameter
- 1.4
- Supercell composite
- 8.1
The text
As transmitted.
855
WUUS54 KOUN 110042
SVROUN
OKC067-TXC077-110115-
/O.NEW.KOUN.SV.W.0577.211111T0042Z-211111T0115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
642 PM CST Wed Nov 10 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Southwestern Jefferson County in southern Oklahoma...
Northeastern Clay County in northern Texas...
* Until 715 PM CST.
* At 642 PM CST, a severe thunderstorm was located 7 miles west of
Terral, moving east at 45 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...
Terral.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3388 9825 3402 9809 3389 9780 3388 9780
3388 9782 3386 9783 3385 9787 3388 9794
3388 9796 3389 9798 3377 9798
TIME...MOT...LOC 0042Z 288DEG 40KT 3389 9807
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
..speg.1 follow-up statement
788
WWUS54 KOUN 110103
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
703 PM CST Wed Nov 10 2021
OKC067-TXC077-110112-
/O.CAN.KOUN.SV.W.0577.000000T0000Z-211111T0115Z/
Jefferson OK-Clay TX-
703 PM CST Wed Nov 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JEFFERSON AND
NORTHEASTERN CLAY COUNTIES IS CANCELLED...
The storm which prompted the warning has moved into Montague County,
therefore the warning for Jefferson County and far northeastern Clay
County has been cancelled. However, severe thunderstorms continue
across southern Clay County.
LAT...LON 3388 9825 3402 9809 3389 9780 3388 9780
3388 9782 3386 9783 3385 9787 3388 9794
3388 9796 3389 9798 3377 9798
TIME...MOT...LOC 0101Z 288DEG 40KT 3382 9781
$$
..speg.The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Nov 10, 6:15 PM CST | Special Weather Statement | OUN | Garvin | 30 min |
| Nov 10, 6:18 PM CST | Severe Thunderstorm Warning | OUN | Payne | 27 min |
| Nov 10, 6:20 PM CST | Severe Thunderstorm Warning | OUN | Carter, Garvin, Stephens | 40 min |
| Nov 10, 6:24 PM CST | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Oklahoma, Payne, Pottawatomie | 51 min |
| Nov 10, 6:36 PM CST | Special Weather Statement | OUN | Cleveland, McClain | 24 min |
| Nov 10, 6:40 PM CST | Tornado Warning | OUN | Carter, Garvin, Stephens | 27 min |
| Nov 10, 7:10 PM CST | Severe Thunderstorm Warning | OUN | Cleveland, Lincoln, Oklahoma, Pottawatomie, Seminole | 50 min |
| Nov 10, 7:11 PM CST | Special Weather Statement | OUN | Carter | 34 min |
| Nov 10, 7:13 PM CST | Special Weather Statement | OUN | Garvin | 32 min |
| Nov 10, 7:17 PM CST | Special Weather Statement | OUN | Bryan | 13 min |
| Nov 10, 7:18 PM CST | Special Weather Statement | OUN | Pontotoc | 27 min |
| Nov 10, 7:31 PM CST | Special Weather Statement | OUN | Bryan | 29 min |
| Nov 10, 7:33 PM CST | Special Weather Statement | OUN | Bryan | 27 min |
| Nov 10, 7:41 PM CST | Severe Thunderstorm Warning | OUN | Bryan | 19 min |
| Nov 10, 7:46 PM CST | Tornado Warning | OUN | Carter, Murray | 27 min |
| Nov 10, 8:16 PM CST | Special Weather Statement | OUN | Carter | 29 min |
| Nov 10, 8:28 PM CST | Special Weather Statement | OUN | Coal | 32 min |
| Nov 10, 8:50 PM CST | Special Weather Statement | OUN | Atoka | 25 min |
| Nov 10, 8:56 PM CST | Special Weather Statement | OUN | Atoka | 34 min |
| Nov 10, 9:13 PM CST | Special Weather Statement | OUN | Atoka | 32 min |
| Nov 10, 6:17 PM CST | Tornado Warning | OUN | Clay | 28 min |
| Nov 10, 6:30 PM CST | Severe Thunderstorm Warning | OUN | Archer, Clay, Wichita | 45 min |
| Nov 10, 7:00 PM CST | Severe Thunderstorm Warning | OUN | Archer, Clay | 45 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.