Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 293, NWS Norman, OK

May 2, 20094 counties in Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at May 2, 2009, 7:21 AM CDT for 4 counties in Oklahoma. It was in force for 54 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 2, 2009, 7:21 AM CDT (12:21 UTC)
Expired: May 2, 2009, 8:15 AM CDT
In force: 54 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Coal County, OK, Hughes County, OK, Pontotoc County, OK, Seminole County, OK

The radar

The Norman radar (KTLX), 90 km from the middle of the area, began a volume at 12:23 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, 0.4 hours before the alert went out and 93 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: 450 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 31 m²/s²
0-3 km storm-relative helicity: 156 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 2, 6:53 AM CDT, 28 minutes earlier.

Area forecast discussion, May 2, 6:53 AM CDT, 28 minutes before

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Hazardous weather outlook, May 2, 5:00 AM CDT, 2 hours 21 minutes before

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In the hours before

Special weather statement, May 2, 6:14 AM CDT, 1 hour 7 minutes before

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Special weather statement, May 2, 6:15 AM CDT, 1 hour 6 minutes before

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Special weather statement, May 2, 6:32 AM CDT, 49 minutes before

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Special weather statement, May 2, 6:42 AM CDT, 39 minutes before

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Special weather statement, May 2, 6:47 AM CDT, 34 minutes before

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Special weather statement, May 2, 7:05 AM CDT, 16 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 1, 9:22 PM CDT	River Flood Warning	OUN	Grant, Kay, Noble	47 hr
May 2, 4:29 AM CDT	Severe Thunderstorm Warning	OUN	Custer, Roger Mills	61 min
May 2, 5:34 AM CDT	Areal Flood Advisory	OUN	Blaine, Caddo, Canadian, Cleveland, Grady, McClain	4 hr
May 2, 7:15 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Coal, Johnston	60 min
May 2, 7:38 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Johnston	37 min
May 2, 8:14 AM CDT	Severe Thunderstorm Warning	OUN	Atoka, Bryan, Coal, Hughes, Johnston, Pontotoc	61 min
May 2, 11:32 AM CDT	Severe Thunderstorm Warning	OUN	Lincoln, Logan, Oklahoma	46 min
May 2, 4:35 PM CDT	Severe Thunderstorm Warning	OUN	Bryan, Marshall	25 min
May 1, 9:00 PM CDT	Severe Thunderstorm Warning	OUN	Knox	30 min
May 1, 9:18 PM CDT	Severe Thunderstorm Warning	OUN	Baylor	30 min

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.