Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 691, NWS Norman, OK

October 31, 20134 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Oct 31, 2013, 1:22 AM CDT for 4 counties in Oklahoma. It was in force for 38 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: Oct 31, 2013, 1:22 AM CDT (06:22 UTC)
Expired: Oct 31, 2013, 2:00 AM CDT
In force: 38 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Comanche County, OK, Cotton County, OK, Grady County, OK, Stephens County, OK

The radar

The Altus AFB radar (KFDR), 81 km from the middle of the area, began a volume at 06:25 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

Fort Worth, TX (KFWD), launched 00:00Z, 6.4 hours before the alert went out and 213 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: 240 J/kg
Mixed-layer CIN: -29 J/kg
Mixed-layer LCL: 564 m above ground
0-6 km bulk shear: 68 kt
0-1 km storm-relative helicity: 140 m²/s²
0-3 km storm-relative helicity: 166 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 Oct 30, 11:54 PM CDT, 1 hour 28 minutes earlier.

Area forecast discussion, Oct 30, 11:54 PM CDT, 1 hour 28 minutes before

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Hazardous weather outlook, Oct 31, 12:48 AM CDT, 34 minutes before

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In the hours before

Local storm report, Oct 30, 11:44 PM CDT, 1 hour 38 minutes before

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Special weather statement, Oct 31, 12:01 AM CDT, 1 hour 21 minutes before

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Special weather statement, Oct 31, 12:18 AM CDT, 1 hour 4 minutes before

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Special weather statement, Oct 31, 12:29 AM CDT, 53 minutes before

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Special weather statement, Oct 31, 12:32 AM CDT, 50 minutes before

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Special weather statement, Oct 31, 1:01 AM CDT, 21 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
Oct 30, 7:36 PM CDT	Special Weather Statement	OUN	Garfield, Grant	24 min
Oct 30, 8:06 PM CDT	Special Weather Statement	OUN	Garfield	24 min
Oct 30, 10:56 PM CDT	Special Weather Statement	OUN	Washita	34 min
Oct 30, 11:27 PM CDT	Special Weather Statement	OUN	Custer, Dewey, Kiowa, Washita, Woodward	33 min
Oct 30, 11:41 PM CDT	Severe Thunderstorm Warning	OUN	Comanche, Jackson, Kiowa, Tillman	49 min
Oct 31, 12:01 AM CDT	Special Weather Statement	OUN	Custer, Dewey, Major, Washita	29 min
Oct 31, 12:29 AM CDT	Special Weather Statement	OUN	Caddo, Comanche	46 min
Oct 31, 12:32 AM CDT	Special Weather Statement	OUN	Blaine	43 min
Oct 31, 1:01 AM CDT	Special Weather Statement	OUN	Cotton	44 min
Oct 31, 1:27 AM CDT	Special Weather Statement	OUN	Canadian, Grady	48 min
Oct 31, 1:29 AM CDT	Special Weather Statement	OUN	Garfield	46 min
Oct 31, 1:58 AM CDT	Special Weather Statement	OUN	Stephens	32 min
Oct 31, 2:16 AM CDT	Special Weather Statement	OUN	Kay, Noble	44 min
Oct 30, 10:48 PM CDT	Special Weather Statement	OUN	Foard, Hardeman	27 min
Oct 31, 12:18 AM CDT	Special Weather Statement	OUN	Wichita, Wilbarger	42 min

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.