Alert archive / Utah / Winter Weather Advisories in 2021
Winter Weather Advisory 22, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this winter weather advisory at Dec 13, 2021, 3:55 PM MST for 23 counties in Utah; Uinta County, Wyoming. It took effect at Dec 14, 2021, 8:00 PM MST. It was in force for 15 hr.
The area
The counties it named.
The facts
- Issued
- Dec 13, 2021, 3:55 PM MST (22:55 UTC)
- In effect from
- Dec 14, 2021, 8:00 PM MST
- Expired
- Dec 15, 2021, 11:00 AM MST
- In force
- 15 hr
- Issued by
- NWS Salt Lake City, UT
All 24 counties
Beaver County, UT, Box Elder County, UT, Cache County, UT, Davis County, UT, Emery County, UT, Garfield County, UT, Iron County, UT, Juab County, UT, Kane County, UT, Millard County, UT, Morgan County, UT, Piute County, UT, Rich County, UT, Salt Lake County, UT, Sanpete County, UT, Sevier County, UT, Summit County, UT, Tooele County, UT, Utah County, UT, Wasatch County, UT, Washington County, UT, Wayne County, UT, Weber County, UT, Uinta County, WY
The radar
The Salt Lake City radar (KMTX), 177 km from the middle of the area, began a volume at 22:55 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
Grand Junction, CO (KGJT), launched 12:00Z, 10.9 hours before the alert went out and 306 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
- 1744 m above ground
- 0-6 km bulk shear
- 64 kt
- 0-1 km storm-relative helicity
- 337 m²/s²
- 0-3 km storm-relative helicity
- 453 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 13, 3:50 AM MST | High Wind Watch | SLC | Beaver, Box Elder, Iron, Juab, Millard, Salt Lake and 3 more | 12 hr |
| Dec 13, 3:20 PM MST | High Wind Warning | SLC | Beaver, Box Elder, Iron, Juab, Millard, Salt Lake and 3 more | 27 hr |
| Dec 13, 3:20 PM MST | Wind Advisory | SLC | Cache, Garfield, Juab, Kane, Millard, Piute and 2 more | 27 hr |
| Dec 13, 3:55 PM MST | Winter Storm Warning | SLC | Beaver, Box Elder, Cache, Carbon, Davis, Duchesne and 19 more | 43 hr |
Nearby
Winter Weather Advisories in Utah, 2021Winter Weather Advisories in Wyoming, 2021Every winter weather advisory 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.