Alert archive / Oklahoma / Snow Advisories in 2007

Snow Advisory 7, NWS Norman, OK

December 27, 200717 counties in Oklahoma

NWS Norman, OK issued this snow advisory at Dec 27, 2007, 3:16 AM CST for 17 counties in Oklahoma. It took effect at Dec 27, 2007, 6:00 PM CST. It was in force for 10 hr.

The area

The counties it named.

The facts

Issued: Dec 27, 2007, 3:16 AM CST (09:16 UTC)
In effect from: Dec 27, 2007, 6:00 PM CST
Expired: Dec 28, 2007, 3:52 AM CST
In force: 10 hr
Issued by: NWS Norman, OK

Counties Alfalfa County, OK, Blaine County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Garfield County, OK, Grant County, OK, Harper County, OK, Kay County, OK, Kingfisher County, OK, Logan County, OK, Major County, OK, Noble County, OK, Payne County, OK, Roger Mills County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 57 km from the middle of the area, began a volume at 09:14 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

Lamont, OK (KLMN), launched 00:00Z, 9.3 hours before the alert went out and 91 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: 489 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 6 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 snow advisory 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 snow advisory went out at Dec 27, 3:03 AM CST, 13 minutes earlier.

Area forecast discussion, Dec 27, 3:03 AM CST, 13 minutes before

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Hazardous weather outlook, Dec 26, 11:43 AM CST, 15 hours 33 minutes before

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In the hours before

Special weather statement, Dec 26, 10:15 PM CST, 5 hours 1 minute 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 27, 4:23 AM CST	Freezing Fog Advisory	OUN	Beckham, Custer, Greer, Harmon, Jackson, Kiowa and 3 more	5 hr
Dec 27, 3:25 PM CST	Heavy Snow Warning	OUN	Alfalfa, Ellis, Garfield, Grant, Harper, Kay and 3 more	6 hr

Nearby

Snow Advisories in Oklahoma, 2007 Every snow advisory in 2007

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.