Alert archive / Colorado / Snow Squall Warnings in 2021

Snow Squall Warning 13, NWS Grand Junction, CO

December 26, 2021Routt County, Colorado

NWS Grand Junction, CO issued this snow squall warning at Dec 26, 2021, 1:37 PM MST for Routt County, Colorado. It was in force for 23 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: Dec 26, 2021, 1:37 PM MST (20:37 UTC)
Expired: Dec 26, 2021, 2:00 PM MST
In force: 23 min
Issued by: NWS Grand Junction, CO
Area: Storm-based polygon

County Routt County, CO

The radar

The Grand Junction radar (KGJX), 185 km from the middle of the area, began a volume at 20:38 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.

What was reported inside it

Time	Report	Where	Remark
Dec 26, 1:59 PM MST	NON-TSTM WND GST 46	3 Ese Hayden, CO	AWOS STATION KHDN YAMPA VALLEY AIRPORT.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Grand Junction, CO (KGJT), launched 12:00Z, 8.6 hours before the alert went out and 193 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: 1 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1865 m above ground
0-6 km bulk shear: 113 kt
0-1 km storm-relative helicity: 165 m²/s²
0-3 km storm-relative helicity: 271 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

924 
WWUS55 KGJT 262037
SQWGJT

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Grand Junction CO
137 PM MST Sun Dec 26 2021

COC107-262100-
/O.NEW.KGJT.SQ.W.0013.211226T2037Z-211226T2100Z/
Routt CO-
137 PM MST Sun Dec 26 2021

The National Weather Service in Grand Junction has issued a

* Snow Squall Warning for...
  Central Routt County in northwestern Colorado...

* Until 200 PM MST.

* At 136 PM MST, a dangerous snow squall was located over Steamboat
  Springs, moving east at 50 mph.

  HAZARD...Whiteout conditions. Zero visibility in heavy snow and 
           blowing snow. Wind gusts greater than 50 mph.

  SOURCE...Radar indicated.

  IMPACT...Dangerous life-threatening travel.

* This includes the following highways...
   U.S. Highway 40 in Colorado between mile markers 104 and 141.
   Colorado 131 between mile markers 62 and 68.

Locations impacted include...
Steamboat Springs, Hayden, Milner and Tow Creek. 

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.

&&

LAT...LON 4049 10734 4061 10728 4065 10694 4049 10680
      4035 10679 4040 10727
TIME...MOT...LOC 2036Z 267DEG 43KT 4049 10683 

$$

ERW

The office that day

Everything else NWS Grand Junction, CO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 26, 11:19 AM MST	Snow Squall Warning	GJT	Moffat, Rio Blanco	26 min
Dec 26, 11:45 AM MST	Snow Squall Warning	GJT	Garfield, Moffat, Rio Blanco	30 min
Dec 26, 12:11 PM MST	Snow Squall Warning	GJT	Garfield, Rio Blanco	34 min
Dec 26, 12:14 PM MST	Snow Squall Warning	GJT	Moffat	31 min
Dec 26, 12:43 PM MST	Snow Squall Warning	GJT	Garfield, Moffat, Rio Blanco, Routt	32 min
Dec 26, 1:07 PM MST	Snow Squall Warning	GJT	Moffat, Routt	23 min
Dec 26, 1:40 PM MST	Snow Squall Warning	GJT	Garfield, Mesa	35 min
Dec 26, 1:56 PM MST	Snow Squall Warning	GJT	Routt	34 min
Dec 26, 2:05 PM MST	Snow Squall Warning	GJT	Garfield	25 min
Dec 26, 2:39 PM MST	Snow Squall Warning	GJT	Eagle, Garfield, Pitkin	21 min
Dec 26, 2:59 PM MST	Snow Squall Warning	GJT	Eagle, Garfield, Pitkin	31 min

Nearby

Snow Squall Warnings in Colorado, 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.