Alert archive / Nebraska / Winter Storm Watches in 2012

Winter Storm Watch 2, NWS Omaha, NE

December 17, 201219 counties in Nebraska; 8 counties in Iowa

NWS Omaha, NE issued this winter storm watch at Dec 17, 2012, 3:31 PM CST for 19 counties in Nebraska; 8 counties in Iowa. It took effect at Dec 19, 2012, 12:00 PM CST. It was in force for .

The area

The counties it named.

The facts

Issued: Dec 17, 2012, 3:31 PM CST (21:31 UTC)
In effect from: Dec 19, 2012, 12:00 PM CST
Expired: Dec 18, 2012, 3:57 PM CST
In force
Issued by: NWS Omaha, NE

All 27 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, Burt County, NE, Butler County, NE, Cass County, NE, Colfax County, NE, Dodge County, NE, Douglas County, NE, Gage County, NE, Jefferson County, NE, Johnson County, NE, Lancaster County, NE, Nemaha County, NE, Otoe County, NE, Pawnee County, NE, Richardson County, NE, Saline County, NE, Sarpy County, NE, Saunders County, NE, Seward County, NE, Washington County, NE

The radar

The Omaha radar (KOAX), 38 km from the middle of the area, began a volume at 21:37 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 12:00Z, 9.5 hours before the alert went out and 227 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: 826 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -6 m²/s²
0-3 km storm-relative helicity: -10 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 watch 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 watch went out at Dec 17, 3:11 PM CST, 20 minutes earlier.

Area forecast discussion, Dec 17, 3:11 PM CST, 20 minutes before

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Hazardous weather outlook, Dec 17, 4:30 AM CST, 11 hours 1 minute before

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Nearby

Winter Storm Watches in Nebraska, 2012 Winter Storm Watches in Iowa, 2012 Every winter storm watch in 2012

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.