Alert archive / Utah / Snow Squall Warnings in 2021
Snow Squall Warning 5, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this snow squall warning at Dec 27, 2021, 4:01 PM MST for 5 counties in Utah. It was in force for 29 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, 4:01 PM MST (23:01 UTC)
- Expired
- Dec 27, 2021, 4:30 PM MST
- In force
- 29 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
Counties Box Elder County, UT, Cache County, UT, Davis County, UT, Morgan County, UT, Weber County, UT
The radar
The Salt Lake City radar (KMTX), 38 km from the middle of the area, began a volume at 23:03 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, 4:15 PM MST | NON-TSTM WND GST 65 | Hooper, UT | FREMONT ISLAND - MILLER HILL - 4700 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 12:00Z, 11.0 hours before the alert went out and 69 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1580 m above ground
- 0-6 km bulk shear
- 84 kt
- 0-1 km storm-relative helicity
- 271 m²/s²
- 0-3 km storm-relative helicity
- 293 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
039
WWUS55 KSLC 272301
SQWSLC
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Salt Lake City UT
401 PM MST Mon Dec 27 2021
UTC003-005-011-029-057-272330-
/O.NEW.KSLC.SQ.W.0005.211227T2301Z-211227T2330Z/
Weber UT-Cache UT-Box Elder UT-Davis UT-Morgan UT-
401 PM MST Mon Dec 27 2021
The National Weather Service in Salt Lake City has issued a
* Snow Squall Warning for...
Weber County in northern Utah...
Southwestern Cache County in northern Utah...
Southeastern Box Elder County in northern Utah...
Northern Davis County in northern Utah...
West central Morgan County in northern Utah...
* Until 430 PM MST
* At 400 PM MST, a dangerous snow squall was located along a line
extending from near Brigham City to 15 miles north of Great Salt
Lake South of the Causeway, moving east at 55 mph.
HAZARD...Extremely poor visibility in snow and blowing snow. Wind
gusts greater than 40 mph.
SOURCE...Radar indicated.
IMPACT...Rapid snow accumulation on area roadways
resulting in dangerous travel.
* This includes the following highways...
Interstate 15 between mile markers 334 and 369.
Interstate 84 between mile markers 82 and 98.
Locations impacted include...
Ogden, Layton, Brigham City, Hill Air Force Base, Roy, Clearfield,
Syracuse, Clinton, North Ogden, South Ogden, Washington Terrace,
Riverdale, Hooper, South Weber, Perry, Wellsville, Willard,
Marriott-Slaterville, Uintah and Mantua.
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 4159 11177 4159 11216 4108 11273 4110 11171
TIME...MOT...LOC 2300Z 255DEG 48KT 4156 11203 4122 11248
$$
MPS1 follow-up statement
769
WWUS55 KSLC 272319
SQWSLC
Snow Squall Warning
National Weather Service Salt Lake City UT
419 PM MST Mon Dec 27 2021
UTC003-005-011-029-057-272330-
/O.CON.KSLC.SQ.W.0005.000000T0000Z-211227T2330Z/
Weber UT-Cache UT-Box Elder UT-Davis UT-Morgan UT-
419 PM MST Mon Dec 27 2021
...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 430 PM MST FOR
WEBER...SOUTHWESTERN CACHE...SOUTHEASTERN BOX ELDER...NORTHERN DAVIS
AND WEST CENTRAL MORGAN COUNTIES...
At 418 PM MST, a dangerous snow squall was located along a line
extending from Mantua to 8 miles northeast of Great Salt Lake South
of the Causeway, moving east at 55 mph.
HAZARD...Extremely poor visibility in snow.
SOURCE...Radar indicated.
IMPACT...Rapid snow accumulation on area roadways resulting in
dangerous travel.
This includes the following highways...
Interstate 15 between mile markers 334 and 369.
Interstate 84 between mile markers 82 and 98.
Locations impacted include...
Ogden, Layton, Brigham City, Hill Air Force Base, Roy, Clearfield,
Syracuse, Clinton, North Ogden, South Ogden, Washington Terrace,
Riverdale, Hooper, South Weber, Perry, Wellsville, Willard,
Marriott-Slaterville, Uintah and Mantua.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Consider avoiding or delaying travel until the snow squall passes
your location. If you must travel, use extra caution and allow extra
time. Rapid changes in visibility and slick road conditions may lead
to accidents.
Reduce your speed and turn on headlights! During snow squalls, the
visibility may suddenly drop to near zero in whiteout conditions.
&&
LAT...LON 4159 11177 4159 11216 4108 11273 4110 11171
TIME...MOT...LOC 2318Z 258DEG 46KT 4151 11191 4111 11232
$$
MPSThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 27, 4:02 AM MST | Winter Storm Warning | SLC | Box Elder, Cache, Davis, Duchesne, Iron, Juab and 9 more | 31 hr |
| Dec 27, 4:27 PM MST | Snow Squall Warning | SLC | Box Elder, Davis, Morgan, Tooele, Weber | 48 min |
| Dec 27, 4:31 PM MST | Snow Squall Warning | SLC | Davis, Tooele | 44 min |
| Dec 27, 4:51 PM MST | Snow Squall Warning | SLC | Davis, Morgan, Salt Lake, Tooele | 54 min |
Nearby
Snow Squall Warnings in Utah, 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.