Alert archive / Oklahoma / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 765, NWS Norman, OK

December 23, 2009Coal County, Johnston County, Pontotoc County, Oklahoma

NWS Norman, OK issued this severe thunderstorm warning at Dec 23, 2009, 12:35 PM CST for Coal County, Johnston County, Pontotoc County, Oklahoma. It was in force for 40 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: Dec 23, 2009, 12:35 PM CST (18:35 UTC)
Expired: Dec 23, 2009, 1:15 PM CST
In force: 40 min
Issued by: NWS Norman, OK
Area: Storm-based polygon

Counties Coal County, OK, Johnston County, OK, Pontotoc County, OK

The radar

The Norman radar (KTLX), 110 km from the middle of the area, began a volume at 18:35 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, 6.6 hours before the alert went out and 108 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: 781 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 434 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 137 m²/s²
0-3 km storm-relative helicity: 139 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 2.2

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 Dec 23, 11:27 AM CST, 1 hour 8 minutes earlier.

Area forecast discussion, Dec 23, 11:27 AM CST, 1 hour 8 minutes before

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Hazardous weather outlook, Dec 23, 11:45 AM CST, 50 minutes before

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In the hours before

Special weather statement, Dec 23, 11:33 AM CST, 1 hour 2 minutes before

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Special weather statement, Dec 23, 12:10 PM CST, 25 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
Dec 23, 4:21 AM CST	Winter Storm Watch	OUN	Canadian, Cleveland, Garfield, Grady, Grant, Kay and 8 more	10 hr
Dec 23, 4:21 AM CST	Winter Weather Advisory	OUN	Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 32 more	19 hr
Dec 23, 1:58 PM CST	Severe Thunderstorm Warning	OUN	Coal, Hughes	32 min
Dec 23, 2:47 PM CST	Winter Storm Warning	OUN	Alfalfa, Atoka, Beckham, Blaine, Bryan, Caddo and 42 more	33 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.