Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 746, NWS Norman, OK

August 6, 2017Caddo County, Grady County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Aug 6, 2017, 1:09 AM CDT for Caddo County, Grady County, Oklahoma. It was in force for 36 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 6, 2017, 1:09 AM CDT (06:09 UTC)
Expired: Aug 6, 2017, 1:45 AM CDT
In force: 36 min
Issued by: NWS Norman, OK
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Caddo County, OK, Grady County, OK

The radar

The Norman radar (KTLX), 82 km from the middle of the area, began a volume at 06:13 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, 6.2 hours before the alert went out and 68 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: 415 J/kg
Mixed-layer CIN: -64 J/kg
Mixed-layer LCL: 2366 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 43 m²/s²
0-3 km storm-relative helicity: 220 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.1

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 6, 12:43 AM CDT, 26 minutes earlier.

Area forecast discussion, Aug 6, 12:43 AM CDT, 26 minutes before

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Hazardous weather outlook, Aug 6, 12:52 AM CDT, 17 minutes before

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In the hours before

Special weather statement, Aug 5, 11:33 PM CDT, 1 hour 36 minutes before

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Special weather statement, Aug 6, 12:00 AM CDT, 1 hour 9 minutes before

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Special weather statement, Aug 6, 12:18 AM CDT, 51 minutes before

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Special weather statement, Aug 6, 12:33 AM CDT, 36 minutes before

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Special weather statement, Aug 6, 12:40 AM CDT, 29 minutes before

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Special weather statement, Aug 6, 1:04 AM CDT, 5 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 5, 7:00 PM CDT	Special Weather Statement	OUN	Dewey	45 min
Aug 5, 7:11 PM CDT	Severe Thunderstorm Warning	OUN	Alfalfa, Grant	34 min
Aug 5, 7:14 PM CDT	Special Weather Statement	OUN	Kay	46 min
Aug 5, 7:19 PM CDT	Severe Thunderstorm Warning	OUN	Kay	41 min
Aug 5, 7:27 PM CDT	Special Weather Statement	OUN	Roger Mills	48 min
Aug 5, 7:49 PM CDT	Special Weather Statement	OUN	Dewey	26 min
Aug 5, 8:21 PM CDT	Severe Thunderstorm Warning	OUN	Kay	54 min
Aug 5, 8:23 PM CDT	Special Weather Statement	OUN	Kay	37 min
Aug 5, 8:29 PM CDT	Special Weather Statement	OUN	Dewey	31 min
Aug 5, 8:46 PM CDT	Severe Thunderstorm Warning	OUN	Grant, Kay	44 min
Aug 5, 8:56 PM CDT	Special Weather Statement	OUN	Roger Mills	49 min
Aug 5, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Roger Mills	51 min
Aug 5, 9:11 PM CDT	Special Weather Statement	OUN	Custer, Dewey	49 min
Aug 5, 9:13 PM CDT	Severe Thunderstorm Warning	OUN	Kay	32 min
Aug 5, 9:47 PM CDT	Special Weather Statement	OUN	Dewey	58 min
Aug 5, 9:57 PM CDT	Areal Flood Advisory	OUN	Kay	3 hr
Aug 5, 9:58 PM CDT	Special Weather Statement	OUN	Kay	32 min
Aug 5, 10:14 PM CDT	Special Weather Statement	OUN	Custer	61 min
Aug 5, 10:24 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	66 min
Aug 5, 10:33 PM CDT	Flash Flood Warning	OUN	Kay	3 hr
Aug 5, 10:39 PM CDT	Special Weather Statement	OUN	Beckham	66 min
Aug 5, 10:45 PM CDT	Special Weather Statement	OUN	Grant, Kay	60 min
Aug 5, 11:13 PM CDT	Special Weather Statement	OUN	Greer, Harmon, Jackson, Kiowa	47 min
Aug 5, 11:27 PM CDT	Special Weather Statement	OUN	Washita	48 min
Aug 5, 11:33 PM CDT	Special Weather Statement	OUN	Kay, Noble	57 min
Aug 6, 12:00 AM CDT	Special Weather Statement	OUN	Caddo, Greer, Harmon, Jackson, Kiowa, Washita	45 min
Aug 6, 12:18 AM CDT	Special Weather Statement	OUN	Payne	57 min
Aug 6, 12:33 AM CDT	Special Weather Statement	OUN	Blaine	27 min
Aug 6, 12:40 AM CDT	Special Weather Statement	OUN	Caddo, Canadian, Comanche, Greer, Harmon, Jackson and 1 more	65 min
Aug 6, 1:04 AM CDT	Special Weather Statement	OUN	Grady	41 min
Aug 6, 1:33 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Cleveland, Grady, McClain, Oklahoma	27 min
Aug 6, 2:00 AM CDT	Special Weather Statement	OUN	Cleveland, Lincoln, McClain, Pottawatomie, Seminole	60 min
Aug 6, 2:59 AM CDT	Special Weather Statement	OUN	Hughes, Pottawatomie, Seminole	46 min
Aug 6, 3:01 AM CDT	Special Weather Statement	OUN	Tillman	44 min
Aug 6, 3:40 AM CDT	Special Weather Statement	OUN	Cotton	50 min
Aug 6, 3:46 AM CDT	Special Weather Statement	OUN	Hughes	44 min
Aug 6, 4:14 AM CDT	Special Weather Statement	OUN	Coal, Garvin, Hughes, Pontotoc, Seminole	46 min
Aug 6, 4:17 AM CDT	Special Weather Statement	OUN	Cotton, Jefferson, Stephens	43 min
Aug 6, 5:01 AM CDT	Special Weather Statement	OUN	Carter, Cotton, Jefferson, Love, Murray	44 min
Aug 6, 5:03 AM CDT	Special Weather Statement	OUN	Atoka, Coal, Garvin, Hughes, Johnston, Murray and 1 more	42 min
Aug 6, 5:32 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal, Garvin, Hughes, Johnston, Murray and 2 more	3 hr
Aug 6, 5:43 AM CDT	Areal Flood Advisory	OUN	Carter, Cotton, Jefferson	3 hr
Aug 6, 5:47 AM CDT	Special Weather Statement	OUN	Atoka, Bryan, Carter, Coal, Johnston, Love and 2 more	58 min
Aug 6, 6:46 AM CDT	Special Weather Statement	OUN	Atoka, Bryan	44 min
Aug 6, 6:54 AM CDT	Special Weather Statement	OUN	Love	36 min
Aug 6, 5:33 PM CDT	Special Weather Statement	OUN	Carter	27 min
Aug 6, 6:03 PM CDT	Special Weather Statement	OUN	Carter	42 min
Aug 6, 6:35 PM CDT	Special Weather Statement	OUN	Marshall	40 min
Aug 6, 6:40 PM CDT	Special Weather Statement	OUN	Carter	50 min
Aug 6, 2:40 PM CDT	Special Weather Statement	OUN	Clay	20 min
Aug 6, 2:47 PM CDT	Severe Thunderstorm Warning	OUN	Clay	13 min
Aug 6, 3:18 PM CDT	Special Weather Statement	OUN	Baylor	27 min
Aug 6, 3:32 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	43 min
Aug 6, 3:34 PM CDT	Special Weather Statement	OUN	Clay	26 min
Aug 6, 4:09 PM CDT	Severe Thunderstorm Warning	OUN	Archer, Baylor	45 min
Aug 6, 4:17 PM CDT	Special Weather Statement	OUN	Clay	43 min
Aug 6, 4:39 PM CDT	Special Weather Statement	OUN	Knox	36 min
Aug 6, 4:44 PM CDT	Severe Thunderstorm Warning	OUN	Knox	46 min
Aug 6, 5:00 PM CDT	Special Weather Statement	OUN	Archer	30 min
Aug 6, 5:04 PM CDT	Special Weather Statement	OUN	Clay	41 min
Aug 6, 5:20 PM CDT	Special Weather Statement	OUN	Wichita	40 min
Aug 6, 5:38 PM CDT	Severe Thunderstorm Warning	OUN	Wichita, Wilbarger	52 min
Aug 6, 6:07 PM CDT	Areal Flood Advisory	OUN	Wichita	3 hr
Aug 6, 6:16 PM CDT	Special Weather Statement	OUN	Wichita	44 min
Aug 6, 6:28 PM CDT	Special Weather Statement	OUN	Wichita	32 min
Aug 6, 6:37 PM CDT	Severe Thunderstorm Warning	OUN	Wichita, Wilbarger	53 min
Aug 6, 6:50 PM CDT	Special Weather Statement	OUN	Knox	40 min
Aug 6, 6:55 PM CDT	Severe Thunderstorm Warning	OUN	Knox	65 min
Aug 6, 6:59 PM CDT	Areal Flood Advisory	OUN	Wichita, Wilbarger	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2017 Every severe thunderstorm warning in 2017

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.