Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 739, NWS Norman, OK

August 12, 20236 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 12, 2023, 6:58 PM CDT for 6 counties in Oklahoma. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 12, 2023, 6:58 PM CDT (23:58 UTC)
Expired: Aug 12, 2023, 7:30 PM CDT
In force: 32 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 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), 78 km from the middle of the area, began a volume at 00:00 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 12.0 hours before the alert went out and 350 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: 238 J/kg
Mixed-layer CIN: -215 J/kg
Mixed-layer LCL: 2834 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: 55 m²/s²
0-3 km storm-relative helicity: 74 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Norman, OK wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 12, 5:24 PM CDT, 1 hour 34 minutes earlier.

Area forecast discussion, Aug 12, 5:24 PM CDT, 1 hour 34 minutes before

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Hazardous weather outlook, Aug 12, 2:56 PM CDT, 4 hours 2 minutes before

Hazardous Weather Outlook
National Weather Service Norman OK
256 PM CDT Sat Aug 12 2023

OKZ004>048-050>052-TXZ083>090-132000-
Harper-Woods-Alfalfa-Grant-Kay-Ellis-Woodward-Major-Garfield-
Noble-Roger Mills-Dewey-Custer-Blaine-Kingfisher-Logan-Payne-
Beckham-Washita-Caddo-Canadian-Oklahoma-Lincoln-Grady-McClain-
Cleveland-Pottawatomie-Seminole-Hughes-Harmon-Greer-Kiowa-Jackson-
Tillman-Comanche-Stephens-Garvin-Murray-Pontotoc-Coal-Cotton-
Jefferson-Carter-Johnston-Atoka-Love-Marshall-Bryan-Hardeman-
Foard-Wilbarger-Wichita-Knox-Baylor-Archer-Clay-
256 PM CDT Sat Aug 12 2023

This hazardous weather outlook is for portions of northern...
western...central...and southern Oklahoma...and western north
Texas.

.DAY ONE...Through Tonight...

.Thunderstorms...
Widespread thunderstorms are forecast to develop across southern,
western, and northern Oklahoma and progress to the north and east
late this afternoon through this evening. Some thunderstorms will
likely reach severe levels and produce damaging winds. A Slight
Risk of severe thunderstorms exists late this afternoon into the
overnight hours across the northern one-third of Oklahoma.

.Dangerous Heat...
Excessive heat and humidity will be seen over the region today.
Heat warnings are in effect.

.Fire Weather...
Elevated fire weather will continue across western north Texas.

.DAYS TWO THROUGH SEVEN...Sunday through Friday...

.Thunderstorms...
Thunderstorms, some severe with damaging winds, are expected
late Sunday and Sunday night, mainly across the northern half of
Oklahoma.

.Dangerous Heat...
Excessive heat and humidity will continue over most of the region
on Sunday, before a strong cold front brings below average
temperatures to start the new work week. A return to hotter
temperatures is expected for the latter half of next week.

.Fire Weather...
Elevated fire weather will continue across western north Texas
through Sunday.

Get graphics and more details at weather.gov/norman...and follow
our weather forecast office on X and Facebook.

In the hours before

Local storm report, Aug 12, 4:06 PM CDT, 2 hours 52 minutes before

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Local storm report, Aug 12, 4:16 PM CDT, 2 hours 42 minutes before

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Special weather statement, Aug 12, 4:20 PM CDT, 2 hours 38 minutes before

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Special weather statement, Aug 12, 5:26 PM CDT, 1 hour 32 minutes before

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Local storm report, Aug 12, 6:00 PM CDT, 58 minutes before

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Local storm report, Aug 12, 6:47 PM CDT, 11 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 11, 7:07 PM CDT	Special Weather Statement	OUN	Ellis	23 min
Aug 11, 7:08 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Blaine, Custer, Dewey, Washita	52 min
Aug 11, 7:27 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	33 min
Aug 11, 7:32 PM CDT	Special Weather Statement	OUN	Ellis	28 min
Aug 11, 7:44 PM CDT	Special Weather Statement	OUN	Jackson	31 min
Aug 11, 7:56 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	49 min
Aug 11, 7:59 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Custer, Dewey, Washita	46 min
Aug 11, 8:37 PM CDT	Special Weather Statement	OUN	Jackson	38 min
Aug 11, 8:39 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Canadian, Garfield, Kingfisher, Major	51 min
Aug 11, 8:45 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Kiowa, Tillman	45 min
Aug 11, 8:55 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	35 min
Aug 11, 9:06 PM CDT	Special Weather Statement	OUN	Comanche	24 min
Aug 11, 9:13 PM CDT	Special Weather Statement	OUN	Kiowa	32 min
Aug 11, 9:17 PM CDT	Areal Flood Advisory	OUN	Jackson	3 hr
Aug 11, 9:20 PM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	40 min
Aug 11, 9:22 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Kingfisher, Logan, Noble	53 min
Aug 11, 9:26 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson, Kiowa, Tillman	49 min
Aug 11, 9:30 PM CDT	Special Weather Statement	OUN	Washita	30 min
Aug 11, 9:41 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Custer, Washita	34 min
Aug 11, 10:02 PM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	43 min
Aug 11, 10:10 PM CDT	Special Weather Statement	OUN	Comanche, Tillman	35 min
Aug 11, 10:29 PM CDT	Special Weather Statement	OUN	Canadian	31 min
Aug 11, 10:35 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	40 min
Aug 11, 10:41 PM CDT	Severe Thunderstorm Warning	OUN	Noble	34 min
Aug 11, 10:49 PM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland	14 min
Aug 11, 11:02 PM CDT	Special Weather Statement	OUN	Kay	28 min
Aug 11, 11:10 PM CDT	Severe Thunderstorm Warning	OUN	Jackson, Tillman	35 min
Aug 11, 11:19 PM CDT	Special Weather Statement	OUN	Canadian	26 min
Aug 11, 11:40 PM CDT	Special Weather Statement	OUN	Cleveland	35 min
Aug 12, 12:08 AM CDT	Special Weather Statement	OUN	Oklahoma	22 min
Aug 12, 1:23 AM CDT	Special Weather Statement	OUN	Cotton	37 min
Aug 12, 4:06 AM CDT	Special Weather Statement	OUN	Cleveland	24 min
Aug 12, 8:30 AM CDT	Special Weather Statement	OUN	Pottawatomie	30 min
Aug 12, 8:46 AM CDT	Special Weather Statement	OUN	Cleveland	29 min
Aug 12, 8:50 AM CDT	Special Weather Statement	OUN	Garvin	25 min
Aug 12, 9:15 AM CDT	Special Weather Statement	OUN	Garvin, Pottawatomie	30 min
Aug 12, 9:48 AM CDT	Special Weather Statement	OUN	Garvin, Pottawatomie	42 min
Aug 12, 11:40 AM CDT	Special Weather Statement	OUN	Cleveland, Pottawatomie	35 min
Aug 12, 12:19 PM CDT	Special Weather Statement	OUN	McClain, Pottawatomie	41 min
Aug 12, 1:17 PM CDT	Special Weather Statement	OUN	McClain, Pottawatomie	28 min
Aug 12, 1:19 PM CDT	Areal Flood Advisory	OUN	Cleveland, Pottawatomie	3 hr
Aug 12, 2:19 PM CDT	Flash Flood Warning	OUN	Cleveland, Pottawatomie	4 hr
Aug 12, 2:29 PM CDT	Excessive Heat Warning	OUN	Atoka, Bryan, Carter, Cleveland, Coal, Garvin and 12 more	31 hr
Aug 12, 2:29 PM CDT	Heat Advisory	OUN	Caddo, Canadian, Cleveland, Comanche, Cotton, Garfield and 18 more	31 hr
Aug 12, 2:35 PM CDT	Red Flag Warning	OUN	Comanche, Cotton, Jackson, Jefferson, Stephens, Tillman	30 hr
Aug 12, 3:15 PM CDT	Special Weather Statement	OUN	Jackson	30 min
Aug 12, 3:15 PM CDT	Special Weather Statement	OUN	Caddo	30 min
Aug 12, 3:20 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	40 min
Aug 12, 3:20 PM CDT	Severe Thunderstorm Warning	OUN	Jackson	40 min
Aug 12, 3:24 PM CDT	Special Weather Statement	OUN	Pottawatomie	36 min
Aug 12, 3:34 PM CDT	Severe Thunderstorm Warning	OUN	Caddo	41 min
Aug 12, 3:37 PM CDT	Special Weather Statement	OUN	Alfalfa	23 min
Aug 12, 3:54 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson, Kiowa, Tillman	36 min
Aug 12, 3:58 PM CDT	Special Weather Statement	OUN	Stephens	32 min
Aug 12, 4:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Comanche, Grady, Stephens	39 min
Aug 12, 4:16 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Grady	44 min
Aug 12, 4:20 PM CDT	Special Weather Statement	OUN	Pottawatomie	25 min
Aug 12, 4:28 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Comanche, Greer, Harmon, Jackson, Kiowa, Tillman	47 min
Aug 12, 4:42 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Caddo, Comanche, Grady, Kiowa, Stephens	48 min
Aug 12, 5:13 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Harmon, Jackson, Kiowa, Tillman	47 min
Aug 12, 5:24 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Kiowa, Stephens	51 min
Aug 12, 5:26 PM CDT	Special Weather Statement	OUN	Greer	34 min
Aug 12, 6:03 PM CDT	Severe Thunderstorm Warning Considerable damage threat	OUN	Tillman	27 min
Aug 12, 6:13 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Grady, Stephens	47 min
Aug 12, 6:19 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Kiowa, Washita	41 min
Aug 12, 6:21 PM CDT	Areal Flood Advisory	OUN	Caddo, Comanche, Grady, Stephens	3 hr
Aug 12, 6:28 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Tillman	32 min
Aug 12, 6:44 PM CDT	Areal Flood Warning	OUN	Cleveland, McClain, Pottawatomie	3 hr
Aug 12, 6:56 PM CDT	Severe Thunderstorm Warning	OUN	Custer, Washita	34 min
Aug 11, 7:44 PM CDT	Special Weather Statement	OUN	Hardeman	31 min
Aug 12, 2:24 AM CDT	Special Weather Statement	OUN	Hardeman	36 min
Aug 12, 6:23 PM CDT	Severe Thunderstorm Warning	OUN	Wichita	22 min

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2023 Every severe thunderstorm warning in 2023

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.