Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2013

Severe Thunderstorm Warning 76, NWS Norman, OK

March 31, 2013Johnston County, Murray County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 31, 2013, 5:38 AM CDT for Johnston County, Murray County, Oklahoma. It was in force for 37 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: Mar 31, 2013, 5:38 AM CDT (10:38 UTC)
Expired: Mar 31, 2013, 6:15 AM CDT
In force: 37 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Johnston County, OK, Murray County, OK

The radar

The Norman radar (KTLX), 110 km from the middle of the area, began a volume at 10:40 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
Mar 31, 5:10 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 10.6 hours before the alert went out and 179 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: 986 J/kg
Mixed-layer CIN: -70 J/kg
Mixed-layer LCL: 1273 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 95 m²/s²
0-3 km storm-relative helicity: 177 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 5.4

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 Mar 31, 1:11 AM CDT, 4 hours 27 minutes earlier.

Area forecast discussion, Mar 31, 1:11 AM CDT, 4 hours 27 minutes before

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Hazardous weather outlook, Mar 31, 5:00 AM CDT, 38 minutes before

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In the hours before

Local storm report, Mar 31, 4:39 AM CDT, 59 minutes before

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Local storm report, Mar 31, 4:45 AM CDT, 53 minutes before

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Local storm report, Mar 31, 4:46 AM CDT, 52 minutes before

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Local storm report, Mar 31, 4:51 AM CDT, 47 minutes before

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Special weather statement, Mar 31, 4:57 AM CDT, 41 minutes before

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Special weather statement, Mar 31, 5:03 AM CDT, 35 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
Mar 30, 7:00 PM CDT	Severe Thunderstorm Warning	OUN	Comanche	60 min
Mar 30, 7:05 PM CDT	Severe Thunderstorm Warning	OUN	Pottawatomie, Seminole	40 min
Mar 30, 7:22 PM CDT	Special Weather Statement	OUN	Grady	8 min
Mar 30, 7:38 PM CDT	Severe Thunderstorm Warning	OUN	Grady	52 min
Mar 30, 7:42 PM CDT	Special Weather Statement	OUN	Cotton	33 min
Mar 30, 7:46 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	44 min
Mar 30, 7:52 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	38 min
Mar 30, 8:25 PM CDT	Severe Thunderstorm Warning	OUN	Grady	50 min
Mar 30, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Hughes, Seminole	47 min
Mar 30, 8:29 PM CDT	Severe Thunderstorm Warning	OUN	Cotton	46 min
Mar 30, 8:55 PM CDT	Special Weather Statement	OUN	McClain	20 min
Mar 30, 9:10 PM CDT	Severe Thunderstorm Warning	OUN	Hughes	50 min
Mar 30, 9:14 PM CDT	Severe Thunderstorm Warning	OUN	Grady	46 min
Mar 30, 9:59 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes	46 min
Mar 30, 10:45 PM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Hughes	60 min
Mar 30, 11:41 PM CDT	Severe Thunderstorm Warning	OUN	Atoka	64 min
Mar 31, 2:31 AM CDT	Special Weather Statement	OUN	Washita	44 min
Mar 31, 2:32 AM CDT	Special Weather Statement	OUN	Grant	43 min
Mar 31, 2:33 AM CDT	Special Weather Statement	OUN	Blaine, Canadian, Kingfisher, Oklahoma	27 min
Mar 31, 2:34 AM CDT	Special Weather Statement	OUN	Caddo	41 min
Mar 31, 2:37 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	53 min
Mar 31, 2:57 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Canadian	63 min
Mar 31, 3:03 AM CDT	Severe Thunderstorm Warning	OUN	Canadian, Oklahoma	42 min
Mar 31, 3:21 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	39 min
Mar 31, 3:24 AM CDT	Severe Thunderstorm Warning	OUN	Washita	66 min
Mar 31, 3:49 AM CDT	Special Weather Statement	OUN	Grady	26 min
Mar 31, 3:49 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, McClain	41 min
Mar 31, 4:13 AM CDT	Special Weather Statement	OUN	Grady	47 min
Mar 31, 4:17 AM CDT	Special Weather Statement	OUN	Greer	43 min
Mar 31, 4:25 AM CDT	Special Weather Statement	OUN	Pottawatomie	35 min
Mar 31, 4:33 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pontotoc, Pottawatomie, Seminole	42 min
Mar 31, 4:57 AM CDT	Special Weather Statement	OUN	Carter, Garvin, Stephens	48 min
Mar 31, 5:03 AM CDT	Special Weather Statement	OUN	Hughes, Murray, Pontotoc	42 min
Mar 31, 5:08 AM CDT	Severe Thunderstorm Warning	OUN	Carter, Garvin, Murray	67 min
Mar 31, 5:14 AM CDT	Severe Thunderstorm Warning	OUN	Coal, Garvin, Pontotoc	46 min
Mar 31, 5:16 AM CDT	Severe Thunderstorm Warning	OUN	Garvin, Johnston, Murray	29 min
Mar 31, 5:55 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston, Pontotoc	50 min
Mar 31, 6:02 AM CDT	Severe Thunderstorm Warning	OUN	Bryan, Carter, Johnston, Love, Marshall	58 min
Mar 31, 6:08 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan	52 min
Mar 31, 7:00 AM CDT	Special Weather Statement	OUN	Bryan	30 min
Mar 31, 8:17 AM CDT	Special Weather Statement	OUN	Comanche, Kiowa	28 min
Mar 31, 8:47 AM CDT	Special Weather Statement	OUN	Caddo, Comanche	28 min
Mar 30, 7:30 PM CDT	Special Weather Statement	OUN	Foard	30 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.