Alert archive / Wyoming / Snow Squall Warnings in 2021

Snow Squall Warning 11, NWS Cheyenne, WY

February 3, 2021Albany County, Carbon County, Wyoming

NWS Cheyenne, WY issued this snow squall warning at Feb 3, 2021, 2:15 PM MST for Albany County, Carbon County, Wyoming. It was in force for 60 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, 2:15 PM MST (21:15 UTC)
Expired: Feb 3, 2021, 3:15 PM MST
In force: 60 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

Counties Albany County, WY, Carbon County, WY

The radar

The Cheyenne radar (KCYS), 112 km from the middle of the area, began a volume at 21:14 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

Riverton, WY (KRIW), launched 12:00Z, 9.3 hours before the alert went out and 259 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: 1710 m above ground
0-6 km bulk shear: 89 kt
0-1 km storm-relative helicity: 221 m²/s²
0-3 km storm-relative helicity: 298 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

356 
WWUS55 KCYS 032115
SQWCYS

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

WYC001-007-032215-
/O.NEW.KCYS.SQ.W.0011.210203T2115Z-210203T2215Z/
Carbon WY-Albany WY-
215 PM MST Wed Feb 3 2021

The National Weather Service in Cheyenne has issued a

* Snow Squall Warning for...
  Eastern Carbon County in south central Wyoming...
  Central Albany County in southeastern Wyoming...

* Until 315 PM MST.

* At 215 PM MST, a dangerous snow squall was located 11 miles south
  of Rock River, or 26 miles northwest of Laramie, moving northeast
  at 40 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 272 and
292.
 
Locations impacted include...
Arlington.

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 4141 10594 4154 10612 4159 10623 4161 10621
      4156 10608 4144 10589
TIME...MOT...LOC 2115Z 239DEG 36KT 4156 10598 

$$

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, 3:00 PM MST	Snow Squall Warning	CYS	Albany	45 min
Feb 3, 3:41 PM MST	Snow Squall Warning	CYS	Albany	49 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.