Alert archive / Nebraska / Wind Chill Advisories in 2007

Wind Chill Advisory 6, NWS Omaha, NE

February 13, 200725 counties in Nebraska; 4 counties in Iowa

NWS Omaha, NE issued this wind chill advisory at Feb 13, 2007, 3:29 PM CST for 25 counties in Nebraska; 4 counties in Iowa. It took effect at Feb 13, 2007, 8:55 PM CST. It was in force for 15 hr.

The area

The counties it named.

The facts

Issued: Feb 13, 2007, 3:29 PM CST (21:29 UTC)
In effect from: Feb 13, 2007, 8:55 PM CST
Expired: Feb 14, 2007, 12:00 PM CST
In force: 15 hr
Issued by: NWS Omaha, NE

All 29 counties

Harrison County, IA, Monona 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, Knox County, NE, Lancaster County, NE, Madison County, NE, Pierce County, NE, Platte 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), 45 km from the middle of the area, began a volume at 21:30 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 300 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: 4 J/kg
Mixed-layer CIN: 0 J/kg
Mixed-layer LCL: 438 m above ground
0-6 km bulk shear: 40 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 70 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 wind chill advisory 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 wind chill advisory went out at Feb 13, 3:00 PM CST, 29 minutes earlier.

Area forecast discussion, Feb 13, 3:00 PM CST, 29 minutes before

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Hazardous weather outlook, Feb 13, 8:08 AM CST, 7 hours 21 minutes before

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In the hours before

Local storm report, Feb 13, 9:51 AM CST, 5 hours 38 minutes before

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Local storm report, Feb 13, 9:52 AM CST, 5 hours 37 minutes before

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Local storm report, Feb 13, 10:13 AM CST, 5 hours 16 minutes before

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Local storm report, Feb 13, 11:49 AM CST, 3 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
Feb 12, 8:01 PM CST	Winter Storm Warning	OAX	Gage, Jefferson, Johnson, Nemaha, Pawnee, Richardson and 1 more	12 hr

Nearby

Wind Chill Advisories in Nebraska, 2007 Wind Chill Advisories in Iowa, 2007 Every wind chill 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.