Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 362, NWS Norman, OK

May 21, 2013Caddo County, Comanche County, Grady County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 21, 2013, 5:25 AM CDT for Caddo County, Comanche County, Grady County, Oklahoma. It was in force for 50 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: May 21, 2013, 5:25 AM CDT (10:25 UTC)
Expired: May 21, 2013, 6:15 AM CDT
In force: 50 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Caddo County, OK, Comanche County, OK, Grady County, OK

The radar

The Altus AFB radar (KFDR), 94 km from the middle of the area, began a volume at 10:26 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
May 21, 12:03 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 10.4 hours before the alert went out and 82 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: 1675 J/kg
Mixed-layer CIN: -83 J/kg
Mixed-layer LCL: 1192 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 270 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 1.2
Supercell composite: 8.8

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 May 21, 3:22 AM CDT, 2 hours 3 minutes earlier.

Area forecast discussion, May 21, 3:22 AM CDT, 2 hours 3 minutes before

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Hazardous weather outlook, May 21, 5:00 AM CDT, 25 minutes before

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In the hours before

Special weather statement, May 21, 3:12 AM CDT, 2 hours 13 minutes before

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Special weather statement, May 21, 3:28 AM CDT, 1 hour 57 minutes before

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Special weather statement, May 21, 3:56 AM CDT, 1 hour 29 minutes before

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Special weather statement, May 21, 3:58 AM CDT, 1 hour 27 minutes before

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Special weather statement, May 21, 4:29 AM CDT, 56 minutes before

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Local storm report, May 21, 5:25 AM CDT, 0 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
May 20, 7:01 PM CDT	Tornado Warning	OUN	Carter, Love, Marshall	44 min
May 20, 7:19 PM CDT	Tornado Warning	OUN	Johnston, Marshall	26 min
May 20, 7:35 PM CDT	River Flood Warning	OUN	Oklahoma	3 hr
May 20, 7:37 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston	68 min
May 20, 7:40 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Johnston, Marshall	50 min
May 20, 7:44 PM CDT	Tornado Warning	OUN	Atoka, Coal, Johnston	46 min
May 20, 7:55 PM CDT	Severe Thunderstorm Warning	OUN	Love	50 min
May 20, 8:11 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	49 min
May 20, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Love, Marshall	47 min
May 20, 9:06 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston	39 min
May 20, 9:09 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Johnston, Marshall, Murray	51 min
May 20, 9:17 PM CDT	Special Weather Statement	OUN	Oklahoma	28 min
May 20, 9:30 PM CDT	Areal Flood Advisory	OUN	Carter, Johnston	3 hr
May 20, 9:44 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	46 min
May 20, 10:00 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton	45 min
May 20, 10:04 PM CDT	Tornado Warning	OUN	Atoka, Bryan	26 min
May 20, 10:25 PM CDT	Tornado Warning	OUN	Atoka	35 min
May 20, 10:33 PM CDT	Special Weather Statement	OUN	Coal	27 min
May 20, 10:38 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray, Pontotoc	52 min
May 20, 10:46 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Cotton, Stephens	44 min
May 20, 11:20 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal	25 min
May 20, 11:25 PM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray, Pontotoc	50 min
May 20, 11:28 PM CDT	Severe Thunderstorm Warning	OUN	Stephens	47 min
May 20, 11:50 PM CDT	Special Weather Statement	OUN	McClain	25 min
May 20, 11:58 PM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes	47 min
May 21, 12:12 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Murray	48 min
May 21, 12:13 AM CDT	Severe Thunderstorm Warning	OUN	Pontotoc, Seminole	47 min
May 21, 12:41 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, McClain, Murray, Pontotoc	49 min
May 21, 12:49 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc	41 min
May 21, 1:10 AM CDT	Severe Thunderstorm Warning	OUN	Hughes, Pontotoc, Seminole	50 min
May 21, 1:33 AM CDT	Special Weather Statement	OUN	Hughes	27 min
May 21, 1:41 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Hughes, Pontotoc	49 min
May 21, 2:16 AM CDT	Special Weather Statement	OUN	Pottawatomie	29 min
May 21, 2:26 AM CDT	Special Weather Statement	OUN	Coal	34 min
May 21, 2:38 AM CDT	Special Weather Statement	OUN	Pottawatomie	37 min
May 21, 3:08 AM CDT	Special Weather Statement	OUN	Hughes	37 min
May 21, 3:12 AM CDT	Special Weather Statement	OUN	Seminole	33 min
May 21, 3:28 AM CDT	Special Weather Statement	OUN	McClain	32 min
May 21, 3:42 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain, Pottawatomie	48 min
May 21, 3:56 AM CDT	Special Weather Statement	OUN	Hughes	34 min
May 21, 3:58 AM CDT	Special Weather Statement	OUN	Kiowa	32 min
May 21, 4:29 AM CDT	Special Weather Statement	OUN	Pottawatomie	31 min
May 21, 5:00 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche	45 min
May 21, 6:00 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, Grady, McClain	30 min
May 21, 6:29 AM CDT	Special Weather Statement	OUN	Cleveland	31 min
May 21, 7:14 AM CDT	Special Weather Statement	OUN	Tillman	46 min
May 21, 7:16 AM CDT	Special Weather Statement	OUN	Stephens	44 min
May 21, 7:39 AM CDT	Areal Flood Advisory	OUN	Coal, Garvin, Hughes, Johnston, Murray, Pontotoc and 1 more	3 hr
May 21, 7:56 AM CDT	Special Weather Statement	OUN	Cotton, Jefferson, Stephens, Tillman	49 min
May 21, 8:18 AM CDT	Special Weather Statement	OUN	McClain	27 min
May 21, 8:24 AM CDT	Special Weather Statement	OUN	Cleveland, Oklahoma	36 min
May 21, 8:34 AM CDT	Special Weather Statement	OUN	Atoka	26 min
May 21, 8:40 AM CDT	Special Weather Statement	OUN	Carter, Murray	35 min
May 21, 8:56 AM CDT	Special Weather Statement	OUN	Cleveland	34 min
May 21, 8:58 AM CDT	Special Weather Statement	OUN	Greer, Harmon	47 min
May 21, 9:06 AM CDT	Areal Flood Advisory	OUN	Atoka, Coal	3 hr
May 21, 9:16 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson	44 min
May 21, 9:24 AM CDT	Special Weather Statement	OUN	Cleveland, McClain	36 min
May 21, 9:50 AM CDT	Special Weather Statement	OUN	Jackson	40 min
May 21, 9:54 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Harmon, Jackson, Kiowa, Washita	51 min
May 21, 10:17 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	43 min
May 21, 10:18 AM CDT	Severe Thunderstorm Warning	OUN	Kiowa, Washita	42 min
May 21, 10:24 AM CDT	Special Weather Statement	OUN	Jackson, Tillman	51 min
May 21, 10:49 AM CDT	Special Weather Statement	OUN	Cleveland	26 min
May 21, 10:58 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Kiowa, Washita	47 min
May 21, 11:10 AM CDT	Special Weather Statement	OUN	Cotton, Jefferson	50 min
May 21, 11:28 AM CDT	Severe Thunderstorm Warning	OUN	Cotton, Jefferson, Stephens	62 min
May 21, 11:30 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian, Grady, Kingfisher	45 min
May 21, 11:53 AM CDT	Special Weather Statement	OUN	Cleveland, Oklahoma	22 min
May 21, 11:59 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Kingfisher, Logan, Oklahoma	46 min
May 21, 12:10 PM CDT	Special Weather Statement	OUN	Pottawatomie, Seminole	35 min
May 21, 12:15 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Jefferson, Murray, Stephens	45 min
May 21, 12:23 PM CDT	Special Weather Statement	OUN	Cleveland, McClain, Pottawatomie	52 min
May 21, 12:25 PM CDT	Special Weather Statement	OUN	Lincoln, Oklahoma	50 min
May 21, 12:45 PM CDT	Special Weather Statement	OUN	Lincoln, Payne	45 min
May 21, 12:49 PM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Johnston, Marshall, Murray, Pontotoc	56 min
May 21, 12:52 PM CDT	Special Weather Statement	OUN	Garvin, Hughes, Pottawatomie, Seminole	53 min
May 21, 12:53 PM CDT	Areal Flood Advisory	OUN	Carter, Johnston, Love, Marshall, Murray, Pontotoc	3 hr
May 21, 1:20 PM CDT	Special Weather Statement	OUN	Coal, Hughes	55 min
May 21, 1:27 PM CDT	Areal Flood Advisory	OUN	Atoka, Bryan, Coal, Hughes, Johnston, Marshall and 1 more	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2013 Every severe thunderstorm warning in 2013

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.