Alert archive / Utah / Snow Squall Warnings in 2021
Snow Squall Warning 9, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this snow squall warning at Dec 27, 2021, 5:02 PM MST for Uinta County, Wyoming; 4 counties in Utah. It was in force for 43 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 27, 2021, 5:02 PM MST (00:02 UTC)
- Expired
- Dec 27, 2021, 5:45 PM MST
- In force
- 43 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
Counties Morgan County, UT, Rich County, UT, Summit County, UT, Weber County, UT, Uinta County, WY
The radar
The Salt Lake City radar (KMTX), 91 km from the middle of the area, began a volume at 00:04 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 27, 5:20 PM MST | NON-TSTM WND GST 55 | Salt Lake City, UT | SR-65 AT BIG MOUNTAIN PASS - 7433 FT |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 00:00Z, 0.0 hours before the alert went out and 65 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
- 33 J/kg
- Mixed-layer CIN
- -42 J/kg
- Mixed-layer LCL
- 1606 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 219 m²/s²
- 0-3 km storm-relative helicity
- 252 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted.
398
WWUS55 KSLC 280002
SQWSLC
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Salt Lake City UT
502 PM MST Mon Dec 27 2021
UTC029-033-043-057-WYC041-280045-
/O.NEW.KSLC.SQ.W.0009.211228T0002Z-211228T0045Z/
Weber UT-Rich UT-Morgan UT-Summit UT-Uinta WY-
502 PM MST Mon Dec 27 2021
The National Weather Service in Salt Lake City has issued a
* Snow Squall Warning for...
Northeastern Weber County in northern Utah...
Southern Rich County in northern Utah...
Morgan County in northern Utah...
Northwestern Summit County in northern Utah...
West central Uinta County in southwestern Wyoming...
* Until 545 PM MST
* At 502 PM MST, a dangerous snow squall was located along a line
extending from 18 miles southwest of Woodruff to Farmington, moving
east at 45 mph.
HAZARD...Extremely poor visibility in heavy snow and blowing snow.
Wind gusts greater than 30 mph.
SOURCE...Radar indicated.
IMPACT...Rapid snow accumulation on area roadways resulting in
dangerous travel.
* This includes the following highways...
Interstate 84 between mile markers 101 and 119.
Interstate 80 in Utah between mile markers 161 and 196.
Locations impacted include...
Morgan, Coalville, Woodruff, East Canyon State Park, Henefer,
Portersville, Echo, Stoddard, Richville, Echo Reservoir, Wahsatch,
Emory, Causey Reservoir, Croydon and Castle Rock.
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.
Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.
&&
LAT...LON 4158 11104 4097 11104 4081 11164 4094 11171
4135 11173
TIME...MOT...LOC 0002Z 262DEG 41KT 4137 11146 4097 11188
$$
MPS2 follow-up statements
600
WWUS55 KSLC 280020
SQWSLC
Snow Squall Warning
National Weather Service Salt Lake City UT
520 PM MST Mon Dec 27 2021
UTC029-033-043-057-WYC041-280045-
/O.CON.KSLC.SQ.W.0009.000000T0000Z-211228T0045Z/
Weber UT-Rich UT-Morgan UT-Summit UT-Uinta WY-
520 PM MST Mon Dec 27 2021
...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 545 PM MST FOR
NORTHEASTERN WEBER...SOUTHERN RICH...MORGAN...NORTHWESTERN SUMMIT AND
WEST CENTRAL UINTA COUNTIES...
At 520 PM MST, a dangerous snow squall was located along a line
extending from 9 miles south of Woodruff to near Morgan, moving east
at 45 mph.
HAZARD...Extremely poor visibility in heavy snow and blowing snow.
Wind gusts greater than 40 mph.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
This includes the following highways...
Interstate 84 between mile markers 101 and 119.
Interstate 80 in Utah between mile markers 161 and 196.
Locations impacted include...
Morgan, Coalville, Woodruff, East Canyon State Park, Henefer,
Portersville, Echo, Stoddard, Richville, Echo Reservoir, Wahsatch,
Emory, Causey Reservoir, Croydon and Castle Rock.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.
&&
LAT...LON 4158 11104 4097 11104 4081 11164 4094 11171
4135 11173
TIME...MOT...LOC 0020Z 262DEG 41KT 4140 11121 4100 11163
$$
MPS551
WWUS55 KSLC 280053
SQWSLC
Snow Squall Warning
National Weather Service Salt Lake City UT
553 PM MST Mon Dec 27 2021
UTC029-033-043-057-WYC041-280103-
/O.EXP.KSLC.SQ.W.0009.000000T0000Z-211228T0045Z/
Weber UT-Rich UT-Morgan UT-Summit UT-Uinta WY-
553 PM MST Mon Dec 27 2021
...THE SNOW SQUALL WARNING FOR NORTHEASTERN WEBER...SOUTHERN RICH...
MORGAN...NORTHWESTERN SUMMIT AND WEST CENTRAL UINTA COUNTIES HAS
EXPIRED...
The snow squall which prompted the warning has exited the area.
Therefore, the snow squall warning has been allowed to expire. Roads
will remain snow covered, and additional snowfall will continue
through the evening hours.
LAT...LON 4158 11104 4097 11104 4081 11164 4094 11171
4135 11173
TIME...MOT...LOC 0053Z 262DEG 41KT 4144 11080 4104 11122
$$
MPSThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 27, 5:24 PM MST | Snow Squall Warning | SLC | Uinta | 66 min |
| Dec 28, 3:42 PM MST | Winter Weather Advisory | SLC | Uinta | 4 days |
| Dec 27, 5:45 PM MST | Snow Squall Warning | SLC | Salt Lake, Summit, Tooele, Utah, Wasatch | 60 min |
| Dec 27, 6:51 PM MST | Special Weather Statement | SLC | Utah, Wasatch | 39 min |
| Dec 28, 3:19 AM MST | Winter Storm Watch | SLC | Beaver, Box Elder, Cache, Carbon, Davis, Duchesne and 18 more | 12 hr |
Nearby
Snow Squall Warnings in Utah, 2021Snow 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.