Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 381, NWS Norman, OK

July 10, 20215 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Jul 10, 2021, 11:12 PM CDT for 5 counties in Oklahoma. It was in force for 63 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: Jul 10, 2021, 11:12 PM CDT (04:12 UTC)
Expired: Jul 11, 2021, 12:15 AM CDT
In force: 63 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Caddo County, OK, Comanche County, OK, Grady County, OK, Kiowa County, OK, Stephens County, OK

The radar

The Altus AFB radar (KFDR), 74 km from the middle of the area, began a volume at 04:15 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
Jul 10, 5:29 PM CDT	Severe Thunderstorm Watch	SPC	7 hr
Jul 10, 9:35 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 4.2 hours before the alert went out and 112 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 2495 J/kg
Mixed-layer CIN: -69 J/kg
Mixed-layer LCL: 1225 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 185 m²/s²
Significant tornado parameter: 1.4
Supercell composite: 14.8

Open this sounding in Storm Lab

The text

As transmitted.

156 
WUUS54 KOUN 110412
SVROUN
OKC015-031-051-075-137-110515-
/O.NEW.KOUN.SV.W.0381.210711T0412Z-210711T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Norman OK
1112 PM CDT Sat Jul 10 2021

The National Weather Service in Norman has issued a

* Severe Thunderstorm Warning for...
  Comanche County in southwestern Oklahoma...
  Southwestern Grady County in central Oklahoma...
  Southern Caddo County in southwestern Oklahoma...
  Northwestern Stephens County in southern Oklahoma...
  Kiowa County in southwestern Oklahoma...

* Until 1215 AM CDT.

* At 1112 PM CDT, the leading edge of winds from a line of severe
  thunderstorms was located along a line extending from 3 miles
  southeast of Hobart to near Boone to 5 miles north of Sterling,
  moving south at 25 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Trained weather spotters reported a 65 mph gust near 
           Meers.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Lawton, Hobart, Cache, Elgin, Carnegie, Apache, Fletcher, Cyril,
  Mountain View, Sterling, Cement, Mountain Park, Medicine Park,
  Indiahoma, Roosevelt, Gotebo, Cooperton, Meers, Tom Steed Reservoir
  and Boone.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Wind damage with these storms will occur before any rain or
lightning. Do not wait for the sound of thunder before taking cover.
SEEK SHELTER IMMEDIATELY inside a sturdy structure and stay away from
windows.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 3512 9875 3510 9874 3512 9863 3510 9862
      3513 9860 3499 9824 3488 9803 3451 9802
      3450 9841 3471 9907 3512 9917
TIME...MOT...LOC 0412Z 339DEG 21KT 3500 9904 3487 9850 3482 9815 

HAIL...1.00IN
WIND...60MPH
 
$$

Mahale

1 follow-up statement

745 
WWUS54 KOUN 110506
SVSOUN

Severe Weather Statement
National Weather Service Norman OK
1206 AM CDT Sun Jul 11 2021

OKC051-110515-
/O.CAN.KOUN.SV.W.0381.000000T0000Z-210711T0515Z/
Grady OK-
1206 AM CDT Sun Jul 11 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GRADY COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 3503 9915 3490 9860 3476 9841 3468 9802
      3451 9802 3450 9841 3471 9907
TIME...MOT...LOC 0505Z 348DEG 21KT 3469 9904 3456 9850 3451 9815 

$$

OKC015-031-075-137-110515-
/O.CON.KOUN.SV.W.0381.000000T0000Z-210711T0515Z/
Comanche OK-Caddo OK-Stephens OK-Kiowa OK-
1206 AM CDT Sun Jul 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR COMANCHE...SOUTHWESTERN CADDO...NORTHWESTERN STEPHENS AND CENTRAL
KIOWA COUNTIES...

At 1205 AM CDT, severe thunderstorms were located along a line 
extending from 4 miles west of Mountain Park to 5 miles southwest of 
Lawton to 10 miles north of Corum, 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...
Lawton, Hobart, Cache, Mountain Park, Medicine Park, Indiahoma,
Roosevelt, Cooperton, Meers, Lake Lawtonka, Tom Steed Reservoir, Fort
Sill, Central High, Wichita Mountains Wildlife Refuge and Hulen.

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 3503 9915 3490 9860 3476 9841 3468 9802
      3451 9802 3450 9841 3471 9907
TIME...MOT...LOC 0505Z 348DEG 21KT 3469 9904 3456 9850 3451 9815 

HAIL...1.00IN
WIND...60MPH
 
$$

Mahale

The office that day

Everything else NWS Norman, OK issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 10, 7:12 PM CDT	Severe Thunderstorm Warning	OUN	Logan, Payne	18 min
Jul 10, 7:23 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Payne	52 min
Jul 10, 7:47 PM CDT	Special Weather Statement	OUN	Kingfisher	28 min
Jul 10, 7:52 PM CDT	Areal Flood Advisory	OUN	Lincoln, Logan, Payne	3 hr
Jul 10, 7:58 PM CDT	Severe Thunderstorm Warning	OUN	Kingfisher, Lincoln, Logan, Oklahoma, Payne	47 min
Jul 10, 8:02 PM CDT	Special Weather Statement	OUN	Blaine	43 min
Jul 10, 8:14 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Kingfisher	61 min
Jul 10, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma, Pottawatomie	50 min
Jul 10, 8:27 PM CDT	Special Weather Statement	OUN	Beckham	48 min
Jul 10, 8:36 PM CDT	Areal Flood Advisory	OUN	Lincoln, Logan, Oklahoma	3 hr
Jul 10, 8:49 PM CDT	Flash Flood Warning	OUN	Lincoln, Payne	101 min
Jul 10, 8:53 PM CDT	Areal Flood Advisory	OUN	Lincoln, Oklahoma, Pottawatomie	3 hr
Jul 10, 8:59 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Custer, Grady, Washita	61 min
Jul 10, 9:02 PM CDT	Flash Flood Warning	OUN	Oklahoma	3 hr
Jul 10, 9:11 PM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Lincoln, McClain, Oklahoma, Pottawatomie	49 min
Jul 10, 9:20 PM CDT	Special Weather Statement	OUN	Okfuskee	40 min
Jul 10, 9:31 PM CDT	Areal Flood Advisory	OUN	Cleveland, McClain, Oklahoma, Pottawatomie, Seminole	3 hr
Jul 10, 9:35 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Cleveland, Grady, McClain	25 min
Jul 10, 9:43 PM CDT	Areal Flood Advisory	OUN	Blaine, Caddo, Canadian, Grady	3 hr
Jul 10, 9:43 PM CDT	Flash Flood Warning	OUN	Oklahoma	2 hr
Jul 10, 10:00 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Grady, Kiowa, Washita	45 min
Jul 10, 10:02 PM CDT	Special Weather Statement	OUN	Cleveland, McClain, Pottawatomie	43 min
Jul 10, 10:19 PM CDT	Areal Flood Advisory	OUN	Seminole	3 hr
Jul 10, 10:23 PM CDT	Areal Flood Advisory	OUN	Caddo, Grady	3 hr
Jul 10, 10:37 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Kiowa, Washita	38 min
Jul 10, 10:39 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, McClain, Pontotoc, Pottawatomie, Seminole	51 min
Jul 10, 10:45 PM CDT	Special Weather Statement	OUN	Grady	30 min
Jul 10, 10:48 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Grady	42 min
Jul 10, 10:54 PM CDT	Special Weather Statement	OUN	Grady	36 min
Jul 10, 11:11 PM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Cotton, Grady, Stephens	3 hr
Jul 10, 11:15 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Johnston, Pontotoc	60 min
Jul 10, 11:31 PM CDT	Flash Flood Warning	OUN	Comanche	3 hr
Jul 10, 11:35 PM CDT	Special Weather Statement	OUN	Stephens	25 min
Jul 10, 11:38 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Jefferson, Stephens	52 min
Jul 10, 11:44 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray, Stephens	46 min
Jul 10, 11:59 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Kiowa, Tillman	46 min
Jul 11, 12:02 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal	58 min
Jul 11, 12:23 AM CDT	Areal Flood Advisory	OUN	Comanche, Cotton, Jefferson, Stephens, Tillman	3 hr
Jul 11, 12:23 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Comanche, Cotton, Jefferson, Love, Marshall and 1 more	67 min
Jul 11, 12:32 AM CDT	Areal Flood Advisory	OUN	Coal, Hughes, Pontotoc	3 hr
Jul 11, 12:43 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Love, Marshall	47 min
Jul 11, 12:46 AM CDT	Special Weather Statement	OUN	Jackson, Tillman	44 min
Jul 11, 12:48 AM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	42 min
Jul 11, 12:54 AM CDT	Areal Flood Advisory	OUN	Carter, Garvin, Jefferson, Murray, Stephens	3 hr
Jul 11, 1:05 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Johnston, Pontotoc	3 hr
Jul 11, 1:24 AM CDT	Areal Flood Advisory	OUN	Comanche, Jackson, Kiowa, Tillman	3 hr
Jul 11, 1:24 AM CDT	Severe Thunderstorm Warning	OUN	Tillman	51 min
Jul 11, 1:33 AM CDT	Special Weather Statement	OUN	Bryan	42 min
Jul 11, 1:36 AM CDT	Areal Flood Advisory	OUN	Cotton, Jefferson, Tillman	3 hr
Jul 11, 2:23 AM CDT	Areal Flood Warning	OUN	Comanche	3 hr
Jul 11, 12:15 PM CDT	River Flood Advisory	OUN	Comanche, Cotton	34 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2021 Every 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.