Alert archive / Oklahoma / Winter Storm Warnings in 2009

Winter Storm Warning 4, NWS Norman, OK

December 23, 200948 counties in Oklahoma; 8 counties in Texas

NWS Norman, OK issued this winter storm warning at Dec 23, 2009, 2:47 PM CST for 48 counties in Oklahoma; 8 counties in Texas. It took effect at Dec 23, 2009, 6:00 PM CST. It was in force for 30 hr. 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, 2:47 PM CST (20:47 UTC)
In effect from: Dec 23, 2009, 6:00 PM CST
Expired: Dec 24, 2009, 11:48 PM CST
In force: 30 hr
Issued by: NWS Norman, OK

All 56 counties

Alfalfa County, OK, Atoka County, OK, Beckham County, OK, Blaine County, OK, Bryan County, OK, Caddo County, OK, Canadian County, OK, Carter County, OK, Cleveland County, OK, Coal County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Garvin County, OK, Grady County, OK, Grant County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Hughes County, OK, Jackson County, OK, Jefferson County, OK, Johnston County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Lincoln County, OK, Logan County, OK, Love County, OK, Major County, OK, Marshall County, OK, McClain County, OK, Murray County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Pontotoc County, OK, Pottawatomie County, OK, Roger Mills County, OK, Seminole County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Woods County, OK, Woodward County, OK, Archer County, TX, Baylor County, TX, Clay County, TX, Foard County, TX, Hardeman County, TX, Knox County, TX, Wichita County, TX, Wilbarger County, TX

The radar

The Norman radar (KTLX), 81 km from the middle of the area, began a volume at 20:50 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, 8.8 hours before the alert went out and 67 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 winter storm 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 winter storm warning went out at Dec 23, 11:27 AM CST, 3 hours 20 minutes earlier.

Area forecast discussion, Dec 23, 11:27 AM CST, 3 hours 20 minutes before

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Hazardous weather outlook, Dec 23, 11:45 AM CST, 3 hours 2 minutes before

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In the hours before

Special weather statement, Dec 23, 11:33 AM CST, 3 hours 14 minutes before

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Special weather statement, Dec 23, 12:10 PM CST, 2 hours 37 minutes before

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Special weather statement, Dec 23, 12:47 PM CST, 2 hours before

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Special weather statement, Dec 23, 1:33 PM CST, 1 hour 14 minutes before

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Special weather statement, Dec 23, 1:44 PM CST, 1 hour 3 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, 12:35 PM CST	Severe Thunderstorm Warning	OUN	Coal, Johnston, Pontotoc	40 min
Dec 23, 1:58 PM CST	Severe Thunderstorm Warning	OUN	Coal, Hughes	32 min

Nearby

Winter Storm Warnings in Oklahoma, 2009 Winter Storm Warnings in Texas, 2009 Every winter storm 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.