Alert archive / Utah / Snow Squall Warnings in 2021
Snow Squall Warning 4, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this snow squall warning at Dec 26, 2021, 8:17 AM MST for Rich County, Summit County, Utah; Uinta County, Wyoming. It was in force for 58 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, 8:17 AM MST (15:17 UTC)
- Expired
- Dec 26, 2021, 9:15 AM MST
- In force
- 58 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Storm-based polygon
Counties Rich County, UT, Summit County, UT, Uinta County, WY
The radar
The Salt Lake City radar (KMTX), 161 km from the middle of the area, began a volume at 15:21 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, 8:32 AM MST | NON-TSTM WND GST 62 | Evanston, WY | EVANSTON - BURNS FIELD - 7162 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, 3.3 hours before the alert went out and 125 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
- 1198 m above ground
- 0-6 km bulk shear
- 63 kt
- 0-1 km storm-relative helicity
- 356 m²/s²
- 0-3 km storm-relative helicity
- 385 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
320
WWUS55 KSLC 261517
SQWSLC
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Snow Squall Warning
National Weather Service Salt Lake City UT
817 AM MST Sun Dec 26 2021
UTC033-043-WYC041-261615-
/O.NEW.KSLC.SQ.W.0004.211226T1517Z-211226T1615Z/
Rich UT-Summit UT-Uinta WY-
817 AM MST Sun Dec 26 2021
The National Weather Service in Salt Lake City has issued a
* Snow Squall Warning for...
Southeastern Rich County in northern Utah...
Northeastern Summit County in northern Utah...
Uinta County in southwestern Wyoming...
* Until 915 AM MST
* At 816 AM MST, a dangerous snow squall was located along a line
extending from near Woodruff to 6 miles southeast of Coalville,
moving northeast at 50 mph.
HAZARD...Whiteout conditions. Zero visibility in heavy snow and
blowing snow. Wind gusts greater than 45 mph.
SOURCE...Radar indicated.
IMPACT...Dangerous life-threatening travel.
* This includes the following highways...
Interstate 80 in Wyoming between mile markers 1 and 55.
Interstate 80 in Utah between mile markers 181 and 196.
Mirror Lake Highway between mile markers 51 and 54.
Locations impacted include...
Evanston, Lyman, Woodruff, Robertson, Mountain View, Lonetree,
Millburne, Fort Bridger, Almy, Altamont, Carter, Ragen, Wahsatch,
Castle Rock, Church Buttes, Piedmont and Leroy.
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 4100 11006 4091 11124 4158 11122 4157 11006
TIME...MOT...LOC 1516Z 246DEG 45KT 4154 11122 4087 11129
$$
MPS2 follow-up statements
502 WWUS55 KSLC 261548 SQWSLC Snow Squall Warning National Weather Service Salt Lake City UT 848 AM MST Sun Dec 26 2021 UTC033-043-WYC041-261615- /O.CON.KSLC.SQ.W.0004.000000T0000Z-211226T1615Z/ Rich UT-Summit UT-Uinta WY- 848 AM MST Sun Dec 26 2021 ...A SNOW SQUALL WARNING REMAINS IN EFFECT UNTIL 915 AM MST FOR SOUTHEASTERN RICH...NORTHEASTERN SUMMIT AND UINTA COUNTIES... At 847 AM MST, a dangerous snow squall was located along a line extending from 9 miles west of Elkol to 18 miles south of Evanston, moving northeast at 50 mph. HAZARD...Whiteout conditions. Zero visibility in heavy snow. SOURCE...Radar indicated. IMPACT...Dangerous life-threatening travel. This includes Interstate 80 in Wyoming between mile markers 1 and 55. Locations impacted include... Evanston, Lyman, Robertson, Mountain View, Lonetree, Millburne, Fort Bridger, Almy, Altamont, Carter, Ragen, Church Buttes, Piedmont and Leroy. PRECAUTIONARY/PREPAREDNESS ACTIONS... Consider avoiding or delaying travel until the snow squall passes your location. If you must travel, use extra caution and allow extra time. Rapid changes in visibility and slick road conditions may lead to accidents. && LAT...LON 4157 11105 4157 11006 4100 11006 4099 11105 TIME...MOT...LOC 1547Z 246DEG 45KT 4168 11080 4101 11087 $$ MPS
982 WWUS55 KSLC 261615 SQWSLC Snow Squall Warning National Weather Service Salt Lake City UT 915 AM MST Sun Dec 26 2021 UTC033-043-WYC041-261625- /O.EXP.KSLC.SQ.W.0004.000000T0000Z-211226T1615Z/ Rich UT-Summit UT-Uinta WY- 915 AM MST Sun Dec 26 2021 ...THE SNOW SQUALL WARNING FOR SOUTHEASTERN RICH...NORTHEASTERN SUMMIT AND UINTA COUNTIES HAS EXPIRED... The snow squall which prompted the warning has weakened and exited the area. Therefore, the snow squall warning has been allowed to expire. Areas of blowing snow and snow-covered roads will continue to make travel difficult. LAT...LON 4157 11105 4157 11006 4100 11006 4099 11105 TIME...MOT...LOC 1615Z 246DEG 45KT 4180 11042 4113 11049 $$ MPS
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 26, 6:45 AM MST | Special Weather Statement | SLC | Cache, Davis, Salt Lake, Weber | 60 min |
| Dec 26, 7:27 AM MST | Special Weather Statement | SLC | Cache, Morgan, Rich, Salt Lake, Utah, Weber | 63 min |
| Dec 26, 7:55 AM MST | Special Weather Statement | SLC | Summit | 65 min |
| Dec 26, 8:33 AM MST | Special Weather Statement | SLC | Utah | 57 min |
| Dec 26, 12:12 PM MST | Winter Weather Advisory | SLC | Morgan, Rich, Summit, Wasatch, Weber | 2 hr |
| Dec 26, 3:49 PM MST | Winter Storm Watch | SLC | Iron, Kane, Washington | 12 hr |
| Dec 26, 3:49 PM MST | Winter Weather Advisory | SLC | Beaver, Box Elder, Cache, Carbon, Davis, Duchesne and 19 more | 52 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.