Alert archive / Wyoming / Snow Squall Warnings in 2021
Snow Squall Warning 3, NWS Cheyenne, WY
NWS Cheyenne, WY issued this snow squall warning at Jan 5, 2021, 5:17 PM MST for Laramie County, Wyoming. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Jan 5, 2021, 5:17 PM MST (00:17 UTC)
- Expired
- Jan 5, 2021, 6:00 PM MST
- In force
- 43 min
- Issued by
- NWS Cheyenne, WY
- Area
- Storm-based polygon
County Laramie County, WY
The radar
The Cheyenne radar (KCYS), 11 km from the middle of the area, began a volume at 00:22 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 00:00Z, 0.3 hours before the alert went out and 201 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
- 2321 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 6 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
528
WWUS55 KCYS 060018
SQWCYS
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Cheyenne WY
517 PM MST Tue Jan 5 2021
WYC021-060100-
/O.NEW.KCYS.SQ.W.0003.210106T0017Z-210106T0100Z/
Laramie WY-
517 PM MST Tue Jan 5 2021
The National Weather Service in Cheyenne has issued a
* Snow Squall Warning for...
Southwestern Laramie County in southeastern Wyoming...
* Until 600 PM MST.
* At 517 PM MST, a dangerous snow squall was located over Warren AFB,
or near Cheyenne, moving south at 15 mph.
HAZARD...Whiteout conditions. Zero visibility in heavy snow and
blowing snow. Wind gusts greater than 30 mph.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
*
This includes the following highways...
Interstate 25 in Wyoming between mile markers 1 and 10.
Interstate 80 in Wyoming between mile markers 345 and 361.
Locations impacted include...
Cheyenne, South Greeley, Warren Af Base, Warren AFB, South Greeley
High and Fox Farm-College.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Slow Down! Rapid changes in visibility and road conditions are
expected with this dangerous snow squall. Be alert for sudden
whiteout conditions.
&&
LAT...LON 4131 10505 4102 10470 4100 10470 4100 10517
TIME...MOT...LOC 0017Z 352DEG 11KT 4112 10490
$$
Wilkinson/Braun1 follow-up statement
863 WWUS55 KCYS 060051 SQWCYS Snow Squall Warning National Weather Service Cheyenne WY 550 PM MST Tue Jan 5 2021 WYC021-060100- /O.EXP.KCYS.SQ.W.0003.000000T0000Z-210106T0100Z/ Laramie WY- 550 PM MST Tue Jan 5 2021 ...THE SNOW SQUALL WARNING FOR SOUTHWESTERN LARAMIE COUNTY WILL EXPIRE AT 600 PM MST... The snow squall which prompted the warning has weakened and exited the area. Therefore, the snow squall warning will be allowed to expire. Areas of blowing snow and snow-covered roads will continue to make travel difficult early this evening. LAT...LON 4131 10505 4102 10470 4100 10470 4100 10517 TIME...MOT...LOC 0050Z 352DEG 11KT 4105 10489 $$ Wilkinson/Brothers
The office that day
Everything else NWS Cheyenne, WY issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 6, 4:37 AM MST | High Wind Warning | CYS | Albany, Carbon | 6 hr |
Nearby
Snow Squall Warnings in Wyoming, 2021Every snow squall warning 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.