Alert archive / Nebraska / Wind Chill Advisories in 2009

Wind Chill Advisory 1, NWS Cheyenne, WY

December 8, 20097 counties in Wyoming; 8 counties in Nebraska

NWS Cheyenne, WY issued this wind chill advisory at Dec 8, 2009, 2:49 PM MST for 7 counties in Wyoming; 8 counties in Nebraska. It took effect at Dec 8, 2009, 5:00 PM MST. It was in force for 18 hr.

The area

The counties it named.

The facts

Issued: Dec 8, 2009, 2:49 PM MST (21:49 UTC)
In effect from: Dec 8, 2009, 5:00 PM MST
Expired: Dec 9, 2009, 11:03 AM MST
In force: 18 hr
Issued by: NWS Cheyenne, WY

Counties Banner County, NE, Box Butte County, NE, Cheyenne County, NE, Dawes County, NE, Kimball County, NE, Morrill County, NE, Scotts Bluff County, NE, Sioux County, NE, Albany County, WY, Carbon County, WY, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY

The radar

The Cheyenne radar (KCYS), 104 km from the middle of the area, began a volume at 21:47 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

Denver, CO (KDNR), launched 12:00Z, 9.8 hours before the alert went out and 251 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: 572 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 342 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 Cheyenne, WY wrote its last area forecast discussion before this wind chill advisory went out at Dec 8, 2:24 PM MST, 25 minutes earlier.

Area forecast discussion, Dec 8, 2:24 PM MST, 25 minutes before

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Hazardous weather outlook, Dec 8, 2:32 PM MST, 17 minutes before

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In the hours before

Local storm report, Dec 8, 10:07 AM MST, 4 hours 42 minutes before

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The office that day

Everything else NWS Cheyenne, WY issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 8, 2:49 PM MST	Winter Weather Advisory	CYS	Albany, Carbon, Converse, Laramie, Platte	45 hr

Nearby

Wind Chill Advisories in Nebraska, 2009 Wind Chill Advisories in Wyoming, 2009 Every wind chill advisory 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.