Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 382, NWS Norman, OK

May 15, 20094 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 15, 2009, 10:10 PM CDT for 4 counties in 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: May 15, 2009, 10:10 PM CDT (03:10 UTC)
Expired: May 15, 2009, 10:46 PM CDT
In force: 36 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Canadian County, OK, Cleveland County, OK, McClain County, OK, Oklahoma County, OK

The radar

The Norman radar (KTLX), 24 km from the middle of the area, began a volume at 03:12 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 15, 7:48 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Norman, OK (KOUN), launched 00:00Z, 3.2 hours before the alert went out and 17 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: 2577 J/kg
Mixed-layer CIN: -126 J/kg
Mixed-layer LCL: 1117 m above ground
0-6 km bulk shear: 26 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 202 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 4.1

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 May 15, 6:22 PM CDT, 3 hours 48 minutes earlier.

Area forecast discussion, May 15, 6:22 PM CDT, 3 hours 48 minutes before

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Hazardous weather outlook, May 15, 5:22 PM CDT, 4 hours 48 minutes before

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In the hours before

Local storm report, May 15, 4:26 PM CDT, 5 hours 44 minutes before

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Local storm report, May 15, 4:39 PM CDT, 5 hours 31 minutes before

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Special weather statement, May 15, 6:44 PM CDT, 3 hours 26 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 15, 7:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Dewey, Roger Mills, Washita	62 min
May 15, 7:32 PM CDT	Severe Thunderstorm Warning	OUN	Greer, Harmon, Jackson	58 min
May 15, 7:44 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey, Garfield, Grant, Kay and 5 more	61 min
May 15, 7:54 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Blaine, Caddo, Canadian, Custer, Dewey and 3 more	66 min
May 15, 8:08 PM CDT	Severe Thunderstorm Warning	OUN	Harmon, Jackson	67 min
May 15, 8:28 PM CDT	Severe Thunderstorm Warning	OUN	Beckham, Greer, Jackson, Kiowa	32 min
May 15, 8:46 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Custer, Dewey, Kingfisher, Lincoln, Logan and 2 more	59 min
May 15, 8:51 PM CDT	Severe Thunderstorm Warning	OUN	Caddo, Comanche, Cotton, Jackson, Kiowa, Tillman	54 min
May 15, 8:59 PM CDT	Areal Flood Advisory	OUN	Harmon, Jackson	3 hr
May 15, 9:01 PM CDT	Severe Thunderstorm Warning	OUN	Blaine, Caddo, Canadian, Grady	44 min
May 15, 9:21 PM CDT	Areal Flood Advisory	OUN	Kingfisher	3 hr
May 15, 9:36 PM CDT	Areal Flood Advisory	OUN	Canadian, Cleveland, Oklahoma	4 hr
May 16, 2:10 AM CDT	River Flood Warning	OUN	Pottawatomie, Seminole	8 hr
May 16, 12:42 AM CDT	Areal Flood Advisory	OUN	Archer, Clay, Wichita	3 hr

Nearby

Severe Thunderstorm Warnings in Oklahoma, 2009 Every severe thunderstorm warning in 2009

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.