Alert archive / Nebraska / Winter Weather Advisories in 2021

Winter Weather Advisory 9, NWS Cheyenne, WY

February 10, 20217 counties in Wyoming; 8 counties in Nebraska

NWS Cheyenne, WY issued this winter weather advisory at Feb 10, 2021, 3:30 PM MST for 7 counties in Wyoming; 8 counties in Nebraska. It took effect at Feb 11, 2021, 5:00 PM MST. It was in force for 66 hr.

The area

The counties it named.

The facts

Issued: Feb 10, 2021, 3:30 PM MST (22:30 UTC)
In effect from: Feb 11, 2021, 5:00 PM MST
Expired: Feb 14, 2021, 11:00 AM MST
In force: 66 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 22:27 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

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 10.5 hours before the alert went out and 318 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: 811 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: -129 m²/s²
0-3 km storm-relative helicity: 104 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 weather 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 winter weather advisory went out at Feb 10, 10:20 AM MST, 5 hours 10 minutes earlier.

Area forecast discussion, Feb 10, 10:20 AM MST, 5 hours 10 minutes before

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Hazardous weather outlook, Feb 10, 6:45 AM MST, 8 hours 45 minutes before

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In the hours before

Local storm report, Feb 10, 10:34 AM MST, 4 hours 56 minutes before

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Local storm report, Feb 10, 10:45 AM MST, 4 hours 45 minutes before

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Local storm report, Feb 10, 10:47 AM MST, 4 hours 43 minutes before

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Local storm report, Feb 10, 12:07 PM MST, 3 hours 23 minutes before

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Local storm report, Feb 10, 1:07 PM MST, 2 hours 23 minutes before

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Local storm report, Feb 10, 1:43 PM MST, 1 hour 47 minutes before

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      <p id="message2">
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        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 10, 2:31 AM MST	High Wind Warning	CYS	Albany, Carbon	44 hr
Feb 10, 6:07 AM MST	Freezing Fog Advisory	CYS	Laramie	4 hr
Feb 10, 3:30 PM MST	Winter Storm Warning	CYS	Albany, Carbon, Converse, Goshen, Laramie, Niobrara and 1 more	4 days

Nearby

Winter Weather Advisories in Nebraska, 2021 Winter Weather Advisories in Wyoming, 2021 Every winter weather advisory in 2021

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.