Alert archive / Wyoming / Snow Squall Warnings in 2021

Snow Squall Warning 6, NWS Cheyenne, WY

February 3, 2021Carbon County, Wyoming

NWS Cheyenne, WY issued this snow squall warning at Feb 3, 2021, 12:14 PM MST for Carbon 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, 12:14 PM MST (19:14 UTC)
Expired: Feb 3, 2021, 1:03 PM MST
In force: 49 min
Issued by: NWS Cheyenne, WY
Area: Storm-based polygon

County Carbon County, WY

The radar

The Cheyenne radar (KCYS), 149 km from the middle of the area, began a volume at 19:16 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, 7.2 hours before the alert went out and 223 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.

016 
WWUS55 KCYS 031914
SQWCYS

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Cheyenne WY
1214 PM MST Wed Feb 3 2021

WYC007-032015-
/O.NEW.KCYS.SQ.W.0006.210203T1914Z-210203T2015Z/
Carbon WY-
1214 PM MST Wed Feb 3 2021

The National Weather Service in Cheyenne has issued a

* Snow Squall Warning for...
  East central Carbon County in south central Wyoming...

* Until 115 PM MST.

* At 1214 PM MST, a dangerous snow squall was located near Elk
  Mountain, or 43 miles east of Rawlins, moving northeast 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 243 and
271.
 
Locations impacted include...
Elk Mountain.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.

Serious injuries and deaths may result from people exiting their
vehicles during a snow squall. Drivers may not be able to see you or
to stop! If stopped on the roadway or involved in an accident,
quickly exit your vehicle move as far away from the roadway as
possible ONLY when it is safe to do so. Do not stand along or near
the roadway, since approaching vehicles may be unable to maintain
control.

&&

LAT...LON 4170 10649 4170 10668 4178 10670 4177 10645
      4162 10620 4158 10623 4161 10632
TIME...MOT...LOC 1914Z 233DEG 30KT 4173 10639 

$$

Cox

1 follow-up statement

892 
WWUS55 KCYS 032003
SQWCYS

Snow Squall Warning
National Weather Service Cheyenne WY
103 PM MST Wed Feb 3 2021

WYC007-032013-
/O.CAN.KCYS.SQ.W.0006.000000T0000Z-210203T2015Z/
Carbon WY-
103 PM MST Wed Feb 3 2021

...THE SNOW SQUALL WARNING FOR EAST CENTRAL CARBON COUNTY IS
CANCELLED...

The snow squall which prompted the warning has weakened. Therefore,
the snow squall warning has been cancelled. Roads will remain snow
covered.

LAT...LON 4170 10649 4170 10668 4178 10670 4177 10645
      4162 10620 4158 10623 4161 10632
TIME...MOT...LOC 2000Z 233DEG 30KT 4198 10595 

$$

Cox

The office that day

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

Issued	Product	Office	Counties	Lasted
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
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.