Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 484, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Sep 7, 2021, 8:27 PM CDT for Blaine County, Custer County, Dewey County, Oklahoma. It was in force for 33 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
- Sep 7, 2021, 8:27 PM CDT (01:27 UTC)
- Expired
- Sep 7, 2021, 9:00 PM CDT
- In force
- 33 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Blaine County, OK, Custer County, OK, Dewey County, OK
The radar
The Vance AFB radar (KVNX), 125 km from the middle of the area, began a volume at 01:27 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
Norman, OK (KOUN), launched 00:00Z, 1.5 hours before the alert went out and 139 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
- 2037 J/kg
- Mixed-layer CIN
- -90 J/kg
- Mixed-layer LCL
- 1991 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 159 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 7.0
The text
As transmitted.
524
WUUS54 KOUN 080127
SVROUN
OKC011-039-043-080200-
/O.NEW.KOUN.SV.W.0484.210908T0127Z-210908T0200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
827 PM CDT Tue Sep 7 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Northeastern Custer County in western Oklahoma...
Southwestern Blaine County in northwestern Oklahoma...
Southeastern Dewey County in northwestern Oklahoma...
* Until 900 PM CDT.
* At 826 PM CDT, a severe thunderstorm was located near Thomas,
moving south 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...
Weatherford, Thomas, Custer City and Fay.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3587 9891 3589 9866 3556 9852 3556 9894
TIME...MOT...LOC 0126Z 350DEG 21KT 3577 9875
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
302 follow-up statements
197
WWUS54 KOUN 080148
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
848 PM CDT Tue Sep 7 2021
OKC043-080158-
/O.CAN.KOUN.SV.W.0484.000000T0000Z-210908T0200Z/
Dewey OK-
848 PM CDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DEWEY COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3579 9890 3580 9865 3557 9853 3557 9887
TIME...MOT...LOC 0148Z 342DEG 19KT 3564 9872
$$
OKC011-039-080200-
/O.CON.KOUN.SV.W.0484.000000T0000Z-210908T0200Z/
Custer OK-Blaine OK-
848 PM CDT Tue Sep 7 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 PM CDT
FOR NORTHEASTERN CUSTER AND SOUTHWESTERN BLAINE COUNTIES...
At 848 PM CDT, a severe thunderstorm was located 7 miles south of
Thomas, moving south at 20 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...
Thomas and Custer City.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3579 9890 3580 9865 3557 9853 3557 9887
TIME...MOT...LOC 0148Z 342DEG 19KT 3564 9872
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
30436
WWUS54 KOUN 080156
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
856 PM CDT Tue Sep 7 2021
OKC011-039-080206-
/O.EXP.KOUN.SV.W.0484.000000T0000Z-210908T0200Z/
Custer OK-Blaine OK-
856 PM CDT Tue Sep 7 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN CUSTER AND
SOUTHWESTERN BLAINE COUNTIES WILL EXPIRE AT 900 PM CDT...
The storm which prompted the warning has weakened below severe
limits, therefore the warning will be allowed to expire. However
gusty winds are still possible with this thunderstorm.
LAT...LON 3579 9890 3580 9865 3557 9853 3557 9887
TIME...MOT...LOC 0156Z 350DEG 21KT 3561 9871
$$
30The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 7, 7:15 PM CDT | Special Weather Statement | OUN | Roger Mills | 30 min |
| Sep 7, 7:21 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Dewey, Kingfisher, Major | 39 min |
| Sep 7, 7:43 PM CDT | Special Weather Statement | OUN | Noble | 32 min |
| Sep 7, 7:51 PM CDT | Severe Thunderstorm Warning | OUN | Blaine, Canadian, Custer, Dewey, Kingfisher | 39 min |
| Sep 7, 8:02 PM CDT | Severe Thunderstorm Warning | OUN | Logan, Noble, Payne | 25 min |
| Sep 7, 8:21 PM CDT | Special Weather Statement | OUN | Custer | 24 min |
| Sep 7, 8:46 PM CDT | Special Weather Statement | OUN | Custer | 29 min |
| Sep 7, 9:11 PM CDT | Special Weather Statement | OUN | Beckham | 34 min |
| Sep 7, 9:19 PM CDT | Severe Thunderstorm Warning | OUN | Beckham, Greer | 41 min |
| Sep 7, 9:23 PM CDT | Special Weather Statement | OUN | Washita | 37 min |
| Sep 7, 9:40 PM CDT | Special Weather Statement | OUN | Kay | 35 min |
| Sep 8, 12:40 AM CDT | Special Weather Statement | OUN | Cotton | 35 min |
| Sep 8, 4:55 AM CDT | Special Weather Statement | OUN | Bryan | 35 min |
| Sep 8, 5:31 AM CDT | Special Weather Statement | OUN | Bryan | 29 min |
| Sep 8, 6:10 AM CDT | Special Weather Statement | OUN | Bryan | 35 min |
Nearby
Severe Thunderstorm Warnings in Oklahoma, 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.