Alert archive / Nebraska / Winter Storm Warnings in 2009

Winter Storm Warning 6, NWS Omaha, NE

December 7, 200930 counties in Nebraska; 8 counties in Iowa

NWS Omaha, NE issued this winter storm warning at Dec 7, 2009, 4:04 AM CST for 30 counties in Nebraska; 8 counties in Iowa. It took effect at Dec 7, 2009, 6:00 PM CST. It was in force for 27 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 7, 2009, 4:04 AM CST (10:04 UTC)
In effect from: Dec 7, 2009, 6:00 PM CST
Expired: Dec 8, 2009, 9:00 PM CST
In force: 27 hr
Issued by: NWS Omaha, NE

All 38 counties

Fremont County, IA, Harrison County, IA, Mills County, IA, Monona County, IA, Montgomery County, IA, Page County, IA, Pottawattamie County, IA, Shelby County, IA, Antelope County, NE, Boone County, NE, Burt County, NE, Butler County, NE, Cass County, NE, Cedar County, NE, Colfax County, NE, Cuming County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Knox County, NE, Lancaster County, NE, Madison County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Pierce County, NE, Platte County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Stanton County, NE, Thurston County, NE, Washington County, NE, Wayne County, NE

The radar

The Omaha radar (KOAX), 16 km from the middle of the area, began a volume at 10:09 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

Topeka, KS (KTOP), launched 00:00Z, 10.1 hours before the alert went out and 269 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: 512 m above ground
0-6 km bulk shear: 58 kt
0-1 km storm-relative helicity: 156 m²/s²
0-3 km storm-relative helicity: 189 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 Omaha, NE wrote its last area forecast discussion before this winter storm warning went out at Dec 7, 3:56 AM CST, 8 minutes earlier.

Area forecast discussion, Dec 7, 3:56 AM CST, 8 minutes before

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Hazardous weather outlook, Dec 6, 10:25 PM CST, 5 hours 39 minutes before

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In the hours before

Local storm report, Dec 6, 11:23 PM CST, 4 hours 41 minutes before

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Local storm report, Dec 6, 11:56 PM CST, 4 hours 8 minutes before

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Local storm report, Dec 7, 12:34 AM CST, 3 hours 30 minutes before

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Local storm report, Dec 7, 12:42 AM CST, 3 hours 22 minutes before

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Local storm report, Dec 7, 12:58 AM CST, 3 hours 6 minutes before

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Local storm report, Dec 7, 1:24 AM CST, 2 hours 40 minutes before

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The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 7, 3:45 PM CST	Blizzard Watch	OAX	Antelope, Boone, Burt, Butler, Cass, Cedar and 24 more	21 hr

Nearby

Winter Storm Warnings in Nebraska, 2009 Winter Storm Warnings in Iowa, 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.