Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 308, NWS Norman, OK
NWS Norman, OK issued this severe thunderstorm warning at Jun 12, 2021, 3:00 AM CDT for 6 counties in Oklahoma. It was in force for 45 min. 2 reports 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
- Jun 12, 2021, 3:00 AM CDT (08:00 UTC)
- Expired
- Jun 12, 2021, 3:45 AM CDT
- In force
- 45 min
- Issued by
- NWS Norman, OK
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Caddo County, OK, Comanche County, OK, Garvin County, OK, Grady County, OK, McClain County, OK, Stephens County, OK
The radar
The Norman radar (KTLX), 95 km from the middle of the area, began a volume at 08:03 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 |
|---|---|---|---|
| Jun 12, 3:30 AM CDT | TSTM WND GST 58 | 7 Nw Velma, OK | |
| Jun 12, 3:35 AM CDT | TSTM WND GST 67 | 7 Nw Velma, OK |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Norman, OK (KOUN), launched 00:00Z, 8.0 hours before the alert went out and 78 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
- 3394 J/kg
- Mixed-layer CIN
- -216 J/kg
- Mixed-layer LCL
- 1175 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 225 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.8
The text
As transmitted.
495
WUUS54 KOUN 120800
SVROUN
OKC015-031-049-051-087-137-120845-
/O.NEW.KOUN.SV.W.0308.210612T0800Z-210612T0845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
300 AM CDT Sat Jun 12 2021
The National Weather Service in Norman has issued a
* Severe Thunderstorm Warning for...
Northeastern Comanche County in southwestern Oklahoma...
Northwestern Garvin County in southern Oklahoma...
Grady County in central Oklahoma...
Southern Caddo County in southwestern Oklahoma...
Northern Stephens County in southern Oklahoma...
McClain County in central Oklahoma...
* Until 345 AM CDT.
* At 300 AM CDT, severe thunderstorms were located along a line
extending from 4 miles southwest of Dibble to 5 miles north of Bray
to 4 miles west of Marlow to near Fort Sill, moving southeast at 35
mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Locations impacted include...
Lawton, Duncan, Chickasha, Newcastle, Blanchard, Purcell, Marlow,
Lindsay, Elgin, Apache, Maysville, Rush Springs, Bray, Fletcher,
Cyril, Dibble, Sterling, Wayne, Washington and Cole.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3457 9854 3486 9862 3519 9757 3490 9726
3443 9773
TIME...MOT...LOC 0800Z 336DEG 31KT 3501 9770 3472 9781 3462 9803 3467
9847
HAIL...<.75IN
WIND...70MPH
$$
301 follow-up statement
398
WWUS54 KOUN 120832
SVSOUN
Severe Weather Statement
National Weather Service Norman OK
332 AM CDT Sat Jun 12 2021
OKC015-120842-
/O.CAN.KOUN.SV.W.0308.000000T0000Z-210612T0845Z/
Caddo OK-
332 AM CDT Sat Jun 12 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CADDO COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
LAT...LON 3457 9854 3468 9856 3509 9747 3490 9726
3443 9773
TIME...MOT...LOC 0832Z 262DEG 33KT 3486 9751 3457 9762 3447 9784 3452
9828
$$
OKC031-049-051-087-137-120845-
/O.CON.KOUN.SV.W.0308.000000T0000Z-210612T0845Z/
Comanche OK-Garvin OK-Grady OK-Stephens OK-McClain OK-
332 AM CDT Sat Jun 12 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 AM CDT
FOR NORTHEASTERN COMANCHE...NORTHWESTERN GARVIN...SOUTHERN GRADY...
NORTHERN STEPHENS AND SOUTHWESTERN MCCLAIN COUNTIES...
At 332 AM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Lindsay to 8 miles southwest of Foster
to 8 miles southeast of Duncan to 6 miles east of Geronimo, moving
east at 40 mph.
HAZARD...60 mph wind gusts and nickel size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Lawton, Duncan, Purcell, Marlow, Lindsay, Elgin, Maysville, Rush
Springs, Bray, Dibble, Sterling, Wayne, Washington, Alex, Bradley,
Agawam, Criner, Fort Sill, Central High and Acme.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3457 9854 3468 9856 3509 9747 3490 9726
3443 9773
TIME...MOT...LOC 0832Z 262DEG 33KT 3486 9751 3457 9762 3447 9784 3452
9828
HAIL...0.88IN
WIND...60MPH
$$
30The office that day
Everything else NWS Norman, OK issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 11, 10:17 PM CDT | Special Weather Statement | OUN | Kay | 13 min |
| Jun 11, 10:23 PM CDT | Severe Thunderstorm Warning | OUN | Kay | 52 min |
| Jun 11, 10:35 PM CDT | Severe Thunderstorm Warning | OUN | Grant | 40 min |
| Jun 11, 10:48 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Grant | 27 min |
| Jun 11, 10:59 PM CDT | Severe Thunderstorm Warning | OUN | Grant, Kay | 16 min |
| Jun 11, 11:08 PM CDT | Severe Thunderstorm Warning | OUN | Kay, Noble | 52 min |
| Jun 11, 11:14 PM CDT | Severe Thunderstorm Warning | OUN | Alfalfa, Garfield, Grant, Kay, Major, Noble and 1 more | 46 min |
| Jun 11, 11:34 PM CDT | Special Weather Statement | OUN | Payne | 26 min |
| Jun 11, 11:58 PM CDT | Severe Thunderstorm Warning | OUN | Lincoln, Logan, Noble, Payne | 47 min |
| Jun 12, 12:01 AM CDT | Special Weather Statement | OUN | Alfalfa, Garfield, Logan | 29 min |
| Jun 12, 12:10 AM CDT | Areal Flood Advisory | OUN | Alfalfa, Garfield, Grant | 3 hr |
| Jun 12, 12:26 AM CDT | Severe Thunderstorm Warning | OUN | Alfalfa | 33 min |
| Jun 12, 12:33 AM CDT | Special Weather Statement | OUN | Kingfisher, Logan | 27 min |
| Jun 12, 12:44 AM CDT | Special Weather Statement | OUN | Lincoln, Oklahoma, Payne | 31 min |
| Jun 12, 1:05 AM CDT | Severe Thunderstorm Warning | OUN | Lincoln | 40 min |
| Jun 12, 1:07 AM CDT | Special Weather Statement | OUN | Canadian, Kingfisher, Logan, Oklahoma | 38 min |
| Jun 12, 1:42 AM CDT | Special Weather Statement | OUN | Blaine, Canadian, Cleveland, Grady, Lincoln, McClain and 3 more | 48 min |
| Jun 12, 2:19 AM CDT | Special Weather Statement | OUN | Caddo, Comanche, Grady | 41 min |
| Jun 12, 2:37 AM CDT | Severe Thunderstorm Warning | OUN | Caddo, Comanche, Grady | 38 min |
| Jun 12, 2:40 AM CDT | Special Weather Statement | OUN | Cleveland, McClain, Pottawatomie, Seminole | 35 min |
| Jun 12, 2:45 AM CDT | Special Weather Statement | OUN | Washita | 30 min |
| Jun 12, 3:10 AM CDT | Special Weather Statement | OUN | Hughes, Pontotoc, Seminole | 50 min |
| Jun 12, 3:39 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Comanche, Cotton, Garvin, Grady, Jefferson and 3 more | 51 min |
| Jun 12, 3:58 AM CDT | Special Weather Statement | OUN | Coal, Hughes, Johnston, Pontotoc | 32 min |
| Jun 12, 4:17 AM CDT | Severe Thunderstorm Warning | OUN | Carter, Cotton, Garvin, Jefferson, Johnston, Love and 3 more | 43 min |
| Jun 12, 4:49 AM CDT | Severe Thunderstorm Warning | OUN | Bryan, Carter, Jefferson, Johnston, Love, Marshall | 41 min |
| Jun 12, 5:33 AM CDT | Special Weather Statement | OUN | Bryan, Love, Marshall | 27 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.