Alert archive / Wyoming / Snow Squall Warnings in 2021

Snow Squall Warning 13, NWS Cheyenne, WY

February 3, 2021Albany County, Wyoming

NWS Cheyenne, WY issued this snow squall warning at Feb 3, 2021, 3:41 PM MST for Albany County, Wyoming. It was in force for 49 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: Feb 3, 2021, 3:41 PM MST (22:41 UTC)
Expired: Feb 3, 2021, 4:30 PM MST
In force: 49 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

County Albany County, WY

The radar

The Cheyenne radar (KCYS), 52 km from the middle of the area, began a volume at 22:41 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, 10.7 hours before the alert went out and 237 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: 2429 m above ground
0-6 km bulk shear: 72 kt
0-1 km storm-relative helicity: -27 m²/s²
0-3 km storm-relative helicity: 178 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

638 
WWUS55 KCYS 032242
SQWCYS

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Cheyenne WY
341 PM MST Wed Feb 3 2021

WYC001-032330-
/O.NEW.KCYS.SQ.W.0013.210203T2241Z-210203T2330Z/
Albany WY-
341 PM MST Wed Feb 3 2021

The National Weather Service in Cheyenne has issued a

* Snow Squall Warning for...
  Southeastern Albany County in southeastern Wyoming...

* Until 430 PM MST.

* At 341 PM MST, a dangerous snow squall was located over North Crow
  Campground, or 17 miles east of Laramie, moving east at 35 mph.

  HAZARD...Extremely poor visibility in snow and blowing snow. Wind 
           gusts up to 30 mph.

  SOURCE...Radar and webcams.

  IMPACT...Expect hazardous road conditions.

* 

This includes Interstate 80 in Wyoming between mile markers 321 and
329.
 
Locations impacted include...
The I-80 Summit and Tie City Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.

If traveling on a highway, find the nearest exit or rest area and
park safely away from traffic. Allow snow squalls to pass before
attempting to resume travel.

&&

LAT...LON 4115 10543 4126 10548 4127 10542 4121 10541
      4116 10537
TIME...MOT...LOC 2241Z 263DEG 29KT 4124 10527 

$$

Braun

The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 3, 12:14 PM MST	Snow Squall Warning	CYS	Carbon	49 min
Feb 3, 12:31 PM MST	Snow Squall Warning	CYS	Albany, Carbon	59 min
Feb 3, 12:46 PM MST	Snow Squall Warning	CYS	Carbon	59 min
Feb 3, 1:30 PM MST	Snow Squall Warning	CYS	Albany, Carbon	45 min
Feb 3, 1:30 PM MST	Snow Squall Warning	CYS	Albany, Carbon	45 min
Feb 3, 2:15 PM MST	Snow Squall Warning	CYS	Albany, Carbon	60 min
Feb 3, 3:00 PM MST	Snow Squall Warning	CYS	Albany	45 min

Nearby

Snow Squall Warnings in Wyoming, 2021 Every 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.