Alert archive / Nebraska / Wind Chill Advisories in 2017

Wind Chill Advisory 7, NWS Cheyenne, WY

December 23, 20177 counties in Wyoming; 8 counties in Nebraska

NWS Cheyenne, WY issued this wind chill advisory at Dec 23, 2017, 10:38 PM MST for 7 counties in Wyoming; 8 counties in Nebraska. It took effect at Dec 23, 2017, 11:00 PM MST. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued: Dec 23, 2017, 10:38 PM MST (05:38 UTC)
In effect from: Dec 23, 2017, 11:00 PM MST
Expired: Dec 24, 2017, 8:00 AM MST
In force: 9 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 05:36 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 (KDEN), launched 00:00Z, 5.6 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: 1673 m above ground
0-6 km bulk shear: 95 kt
0-1 km storm-relative helicity: 236 m²/s²
0-3 km storm-relative helicity: 380 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 23, 5:00 PM MST, 5 hours 38 minutes earlier.

Area forecast discussion, Dec 23, 5:00 PM MST, 5 hours 38 minutes before

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Hazardous weather outlook, Dec 23, 2:51 AM MST, 19 hours 47 minutes before

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In the hours before

Local storm report, Dec 23, 5:39 PM MST, 4 hours 59 minutes before

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Local storm report, Dec 23, 5:55 PM MST, 4 hours 43 minutes before

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Local storm report, Dec 23, 6:34 PM MST, 4 hours 4 minutes before

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Local storm report, Dec 23, 8:09 PM MST, 2 hours 29 minutes before

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Local storm report, Dec 23, 8:28 PM MST, 2 hours 10 minutes before

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Local storm report, Dec 23, 10:14 PM MST, 24 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 24, 2:20 AM MST	Winter Weather Advisory	CYS	Albany, Carbon	11 hr
Dec 24, 8:14 AM MST	Winter Weather Advisory	CYS	Albany, Carbon, Laramie	5 hr
Dec 24, 1:14 PM MST	Blizzard Warning	CYS	Albany, Carbon	28 hr
Dec 24, 1:14 PM MST	Winter Storm Warning	CYS	Albany, Carbon	41 hr
Dec 24, 1:14 PM MST	Winter Weather Advisory	CYS	Albany, Carbon, Converse, Goshen, Laramie, Niobrara and 1 more	37 hr

Nearby

Wind Chill Advisories in Nebraska, 2017 Wind Chill Advisories in Wyoming, 2017 Every wind chill advisory in 2017

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.