Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 72, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Apr 9, 2021, 6:05 PM CDT for 4 counties in Oklahoma. It was in force for 40 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
- Apr 9, 2021, 6:05 PM CDT (23:05 UTC)
- Expired
- Apr 9, 2021, 6:45 PM CDT
- In force
- 40 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Garvin County, OK, Grady County, OK, McClain County, OK, Stephens County, OK
The radar
The Norman radar (KTLX), 72 km from the middle of the area, began a volume at 23:07 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 |
|---|---|---|---|
| Apr 9, 3:55 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Norman, OK (KOUN), launched 12:00Z, 11.1 hours before the alert went out and 55 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
- 1068 J/kg
- Mixed-layer CIN
- -311 J/kg
- Mixed-layer LCL
- 1414 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 137 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.6
The text
As transmitted.
085
WUUS54 KOUN 092305
SVROUN
OKC049-051-087-137-092345-
/O.NEW.KOUN.SV.W.0072.210409T2305Z-210409T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
605 PM CDT Fri Apr 9 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Northwestern Garvin County in southern Oklahoma...
Southeastern Grady County in central Oklahoma...
Northeastern Stephens County in southern Oklahoma...
Southwestern McClain County in central Oklahoma...
* Until 645 PM CDT.
* At 604 PM CDT, severe thunderstorms were located along a line
extending from 4 miles east of Agawam to 4 miles north of Bradley,
moving southeast at 20 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* Locations impacted include...
Lindsay, Maysville, Alex, Bradley, Antioch, Cox City, Whitebead,
Erin Springs and Payne.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
These storms are producing large hail. SEEK SHELTER NOW inside a
sturdy structure and stay away from windows!
&&
LAT...LON 3462 9774 3477 9723 3499 9767 3486 9793
TIME...MOT...LOC 2304Z 311DEG 17KT 3485 9787 3494 9769
HAIL...1.75IN
WIND...60MPH
$$
Mahale3 follow-up statements
333
WWUS54 KOUN 092313
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
613 PM CDT Fri Apr 9 2021
OKC049-051-087-137-092345-
/O.CON.KOUN.SV.W.0072.000000T0000Z-210409T2345Z/
Garvin OK-Grady OK-Stephens OK-McClain OK-
613 PM CDT Fri Apr 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHWESTERN GARVIN...SOUTHEASTERN GRADY...NORTHEASTERN STEPHENS
AND SOUTHWESTERN MCCLAIN COUNTIES...
At 613 PM CDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Agawam to 3 miles northeast of
Bradley, moving southeast at 20 mph.
HAZARD...Ping pong ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Lindsay, Maysville, Alex, Bradley, Antioch, Cox City, Whitebead and
Erin Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3482 9790 3495 9769 3477 9723 3462 9774
TIME...MOT...LOC 2313Z 311DEG 17KT 3483 9784 3492 9766
HAIL...1.50IN
WIND...60MPH
$$
Mahale027
WWUS54 KOUN 092324
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
624 PM CDT Fri Apr 9 2021
OKC087-092334-
/O.CAN.KOUN.SV.W.0072.000000T0000Z-210409T2345Z/
McClain OK-
624 PM CDT Fri Apr 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MCCLAIN COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3478 9786 3487 9771 3471 9743 3462 9774
TIME...MOT...LOC 2324Z 322DEG 18KT 3476 9781 3484 9766
$$
OKC049-051-137-092345-
/O.CON.KOUN.SV.W.0072.000000T0000Z-210409T2345Z/
Garvin OK-Grady OK-Stephens OK-
624 PM CDT Fri Apr 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR WEST CENTRAL GARVIN...SOUTHEASTERN GRADY AND NORTHEASTERN
STEPHENS COUNTIES...
At 624 PM CDT, severe thunderstorms were located along a line
extending from 8 miles north of Bray to 3 miles west of Lindsay,
moving southeast at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Cox City and Erin Springs.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3478 9786 3487 9771 3471 9743 3462 9774
TIME...MOT...LOC 2324Z 322DEG 18KT 3476 9781 3484 9766
HAIL...1.00IN
WIND...60MPH
$$
Mahale797
WWUS54 KOUN 092337
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
637 PM CDT Fri Apr 9 2021
OKC049-051-137-092347-
/O.EXP.KOUN.SV.W.0072.000000T0000Z-210409T2345Z/
Garvin OK-Grady OK-Stephens OK-
637 PM CDT Fri Apr 9 2021
...THE SEVERE THUNDERSTORM WARNING FOR WEST CENTRAL GARVIN...
SOUTHEASTERN GRADY AND NORTHEASTERN STEPHENS COUNTIES WILL EXPIRE AT
645 PM CDT...
The storms which prompted the warning have weakened below severe
limits, therefore the warning will be allowed to expire. However
small hail and heavy rain are still possible with these
thunderstorms.
LAT...LON 3478 9786 3487 9771 3471 9743 3462 9774
TIME...MOT...LOC 2337Z 311DEG 17KT 3472 9776 3480 9761
$$
MahaleThe office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 9, 2:57 AM CDT | Wind Advisory | OUN | Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 31 more | 20 hr |
| Apr 9, 10:21 AM CDT | Special Weather Statement | OUN | Bryan | 24 min |
| Apr 9, 10:32 AM CDT | Special Weather Statement | OUN | Bryan | 28 min |
| Apr 9, 3:21 PM CDT | Special Weather Statement | OUN | Greer | 24 min |
| Apr 9, 3:28 PM CDT | Severe Thunderstorm Warning | OUN | Greer | 23 min |
| Apr 9, 3:35 PM CDT | Special Weather Statement | OUN | Washita | 40 min |
| Apr 9, 3:39 PM CDT | Special Weather Statement | OUN | Kingfisher | 36 min |
| Apr 9, 3:49 PM CDT | Special Weather Statement | OUN | Canadian | 26 min |
| Apr 9, 3:52 PM CDT | Special Weather Statement | OUN | Greer | 23 min |
| Apr 9, 3:57 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian, Grady | 48 min |
| Apr 9, 4:12 PM CDT | Special Weather Statement | OUN | Logan | 33 min |
| Apr 9, 4:13 PM CDT | Special Weather Statement | OUN | Washita | 32 min |
| Apr 9, 4:23 PM CDT | Special Weather Statement | OUN | Grant | 37 min |
| Apr 9, 4:25 PM CDT | Severe Thunderstorm Warning | OUN | Logan, Payne | 50 min |
| Apr 9, 4:29 PM CDT | Severe Thunderstorm Warning | OUN | Kiowa, Washita | 16 min |
| Apr 9, 4:36 PM CDT | Severe Thunderstorm Warning | OUN | Caddo, Canadian, Grady | 39 min |
| Apr 9, 4:52 PM CDT | Special Weather Statement | OUN | Kingfisher | 23 min |
| Apr 9, 4:53 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher | 52 min |
| Apr 9, 5:06 PM CDT | Severe Thunderstorm Warning | OUN | Grady | 39 min |
| Apr 9, 5:17 PM CDT | Severe Thunderstorm Warning | OUN | Logan, Noble, Payne | 43 min |
| Apr 9, 5:18 PM CDT | Severe Thunderstorm Warning | OUN | Kingfisher, Logan, Oklahoma | 42 min |
| Apr 9, 5:25 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Payne | 50 min |
| Apr 9, 5:31 PM CDT | Severe Thunderstorm Warning | OUN | Grady, McClain | 44 min |
| Apr 9, 5:36 PM CDT | Special Weather Statement | OUN | Pottawatomie | 24 min |
| Apr 9, 5:39 PM CDT | Special Weather Statement | OUN | Lincoln | 36 min |
| Apr 9, 5:48 PM CDT | Special Weather Statement | OUN | Lincoln | 27 min |
| Apr 9, 5:51 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie, Seminole | 39 min |
| Apr 9, 5:57 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Oklahoma | 48 min |
| Apr 9, 6:09 PM CDT | Special Weather Statement | OUN | Lincoln | 36 min |
| Apr 9, 6:22 PM CDT | Severe Thunderstorm Warning | OUN | Pottawatomie, Seminole | 27 min |
| Apr 9, 6:34 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 56 min |
| Apr 9, 6:38 PM CDT | Special Weather Statement | OUN | Pottawatomie | 52 min |
| Apr 9, 6:58 PM CDT | Special Weather Statement | OUN | Pottawatomie, Seminole | 47 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.