Alert archive / Oklahoma / Winter Storm Warnings in 2015

Winter Storm Warning 1, NWS Norman, OK

January 21, 201510 counties in Oklahoma

NWS Norman, OK issued this winter storm warning at Jan 21, 2015, 12:40 PM CST for 10 counties in Oklahoma. It took effect at Jan 21, 2015, 6:00 PM CST. It was in force for 10 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: Jan 21, 2015, 12:40 PM CST (18:40 UTC)
In effect from: Jan 21, 2015, 6:00 PM CST
Expired: Jan 22, 2015, 4:15 AM CST
In force: 10 hr
Issued by: NWS Norman, OK

Counties Beckham County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Harper County, OK, Roger Mills County, OK, Washita County, OK, Woodward County, OK

The radar

The Altus AFB radar (KFDR), 155 km from the middle of the area, began a volume at 18:45 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

Amarillo Airport, TX (KAMA), launched 12:00Z, 6.7 hours before the alert went out and 211 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: 1156 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: -48 m²/s²
0-3 km storm-relative helicity: 146 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 Jan 21, 11:06 AM CST, 1 hour 34 minutes earlier.

Area forecast discussion, Jan 21, 11:06 AM CST, 1 hour 34 minutes before

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Hazardous weather outlook, Jan 21, 10:15 AM CST, 2 hours 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
Jan 21, 5:33 AM CST	Freezing Fog Advisory	OUN	Kay, Noble, Payne	3 hr
Jan 21, 9:43 AM CST	Winter Storm Watch	OUN	Beckham, Custer, Dewey, Ellis, Greer, Harmon and 4 more	3 hr
Jan 21, 12:53 PM CST	Winter Weather Advisory	OUN	Alfalfa, Beckham, Blaine, Caddo, Canadian, Cleveland and 26 more	20 hr

Nearby

Winter Storm Warnings in Oklahoma, 2015 Every winter storm warning in 2015

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.