Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 72, NWS Norman, OK

March 27, 2009Pottawatomie County, Seminole County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Mar 27, 2009, 12:27 PM CDT for Pottawatomie County, Seminole County, Oklahoma. It was in force for 25 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 27, 2009, 12:27 PM CDT (17:27 UTC)
Expired: Mar 27, 2009, 12:52 PM CDT
In force: 25 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Pottawatomie County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 48 km from the middle of the area, began a volume at 17:26 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 nearest sounding before it

Norman, OK (KOUN), launched 12:00Z, 5.5 hours before the alert went out and 56 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 490 m above ground
0-6 km bulk shear: 60 kt
0-1 km storm-relative helicity: 346 m²/s²
0-3 km storm-relative helicity: 511 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.1

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 Mar 27, 10:39 AM CDT, 1 hour 48 minutes earlier.

Area forecast discussion, Mar 27, 10:39 AM CDT, 1 hour 48 minutes before

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Hazardous weather outlook, Mar 27, 11:45 AM CDT, 42 minutes before

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In the hours before

Special weather statement, Mar 27, 11:30 AM CDT, 57 minutes before

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Special weather statement, Mar 27, 11:39 AM CDT, 48 minutes before

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Local storm report, Mar 27, 11:50 AM CDT, 37 minutes before

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Special weather statement, Mar 27, 11:51 AM CDT, 36 minutes before

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Special weather statement, Mar 27, 12:06 PM CDT, 21 minutes before

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Local storm report, Mar 27, 12:22 PM 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
Mar 27, 4:41 AM CDT	Blizzard Warning	OUN	Alfalfa, Beckham, Blaine, Custer, Dewey, Ellis and 7 more	32 hr
Mar 27, 4:41 AM CDT	Winter Storm Warning	OUN	Caddo, Canadian, Cleveland, Comanche, Grady, Greer and 13 more	36 hr
Mar 27, 5:43 AM CDT	Severe Thunderstorm Warning	OUN	Beckham, Custer, Roger Mills, Washita	47 min
Mar 27, 9:09 AM CDT	Severe Thunderstorm Warning	OUN	Garfield, Noble	36 min
Mar 27, 11:00 AM CDT	Severe Thunderstorm Warning	OUN	Caddo, Kiowa, Washita	45 min
Mar 27, 11:45 AM CDT	Severe Thunderstorm Warning	OUN	Cleveland, Garvin, McClain, Pottawatomie	45 min
Mar 27, 2:56 PM CDT	Winter Weather Advisory	OUN	Caddo, Canadian, Cleveland, Comanche, Cotton, Garvin and 16 more	26 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.