Alert archive / Utah / Winter Weather Advisories in 2021
Winter Weather Advisory 24, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this winter weather advisory at Dec 22, 2021, 2:18 PM MST for 19 counties in Utah; Uinta County, Wyoming. It took effect at Dec 23, 2021, 12:00 PM MST. It was in force for 44 hr.
The area
The counties it named.
The facts
- Issued
- Dec 22, 2021, 2:18 PM MST (21:18 UTC)
- In effect from
- Dec 23, 2021, 12:00 PM MST
- Expired
- Dec 25, 2021, 8:00 AM MST
- In force
- 44 hr
- Issued by
- NWS Salt Lake City, UT
Counties Beaver County, UT, Carbon County, UT, Duchesne 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, Sanpete County, UT, Sevier County, UT, Summit 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), 218 km from the middle of the area, began a volume at 21:22 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, 9.3 hours before the alert went out and 280 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
- 1714 m above ground
- 0-6 km bulk shear
- 71 kt
- 0-1 km storm-relative helicity
- 98 m²/s²
- 0-3 km storm-relative helicity
- 253 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this winter weather advisory went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Salt Lake City, UT wrote its last area forecast discussion before this winter weather advisory went out at Dec 22, 4:30 AM MST, 9 hours 48 minutes earlier.
Area forecast discussion, Dec 22, 4:30 AM MST, 9 hours 48 minutes before
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</html>The office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 22, 3:12 AM MST | Winter Storm Warning | SLC | Box Elder, Cache, Carbon, Davis, Duchesne, Emery and 9 more | 3 days |
| Dec 22, 3:12 AM MST | Winter Storm Watch | SLC | Uinta | 11 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.