Alert archive / Nebraska / Winter Weather Advisories in 2021
Winter Weather Advisory 37, NWS Cheyenne, WY
NWS Cheyenne, WY issued this winter weather advisory at Oct 30, 2021, 2:41 PM MDT for 6 counties in Wyoming; 8 counties in Nebraska. It took effect at Oct 31, 2021, 12:00 AM MDT. It was in force for 36 hr.
The area
The counties it named.
The facts
- Issued
- Oct 30, 2021, 2:41 PM MDT (20:41 UTC)
- In effect from
- Oct 31, 2021, 12:00 AM MDT
- Expired
- Nov 1, 2021, 12:00 PM MDT
- In force
- 36 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, Converse County, WY, Goshen County, WY, Laramie County, WY, Niobrara County, WY, Platte County, WY
The radar
The Cheyenne radar (KCYS), 114 km from the middle of the area, began a volume at 20:42 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, 8.7 hours before the alert went out and 304 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2583 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 40 m²/s²
- 0-3 km storm-relative helicity
- 35 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Oct 30, 11:47 AM MDT, 2 hours 54 minutes earlier.
Area forecast discussion, Oct 30, 11:47 AM MDT, 2 hours 54 minutes before
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</html>Hazardous weather outlook, Oct 30, 5:13 AM MDT, 9 hours 28 minutes before
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</html>The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 30, 2:37 PM MDT | Freezing Fog Advisory | CYS | Albany, Laramie | 27 hr |
Nearby
Winter Weather Advisories in Nebraska, 2021Winter Weather Advisories in Wyoming, 2021Every 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.