Alert archive / Oklahoma / Winter Storm Warnings in 2020

Winter Storm Warning 4, NWS Norman, OK

December 12, 202022 counties in Oklahoma

NWS Norman, OK issued this winter storm warning at Dec 12, 2020, 3:01 AM CST for 22 counties in Oklahoma. It took effect at Dec 13, 2020, 12:00 AM CST. It was in force for 15 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 12, 2020, 3:01 AM CST (09:01 UTC)
In effect from: Dec 13, 2020, 12:00 AM CST
Expired: Dec 13, 2020, 2:41 PM CST
In force: 15 hr
Issued by: NWS Norman, OK

All 22 counties

Alfalfa County, OK, Beckham County, OK, Blaine County, OK, Canadian 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, Lincoln County, OK, Logan County, OK, Major County, OK, Noble County, OK, Oklahoma County, OK, Payne County, OK, Roger Mills County, OK, Washita County, OK, Woods County, OK, Woodward County, OK

The radar

The Vance AFB radar (KVNX), 75 km from the middle of the area, began a volume at 08:59 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

Dodge City, (KDDC), launched 00:00Z, 9.0 hours before the alert went out and 231 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 617 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 20 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 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 11, 10:53 PM CST, 4 hours 8 minutes earlier.

Area forecast discussion, Dec 11, 10:53 PM CST, 4 hours 8 minutes before

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Hazardous weather outlook, Dec 11, 11:00 PM CST, 4 hours 1 minute before

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Nearby

Winter Storm Warnings in Oklahoma, 2020 Every winter storm warning in 2020

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.