Alert archive / Utah / Winter Storm Warnings in 2023

Winter Storm Warning 20, NWS Salt Lake City, UT

December 7, 202311 counties in Utah

NWS Salt Lake City, UT issued this winter storm warning at Dec 7, 2023, 2:11 PM MST for 11 counties in Utah. It took effect at Dec 7, 2023, 11:00 PM MST. It was in force for 22 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Dec 7, 2023, 2:11 PM MST (21:11 UTC)
In effect from: Dec 7, 2023, 11:00 PM MST
Expired: Dec 8, 2023, 8:39 PM MST
In force: 22 hr
Issued by: NWS Salt Lake City, UT

Counties Box Elder County, UT, Cache County, UT, Davis County, UT, Juab County, UT, Morgan County, UT, Rich County, UT, Salt Lake County, UT, Summit County, UT, Utah County, UT, Wasatch County, UT, Weber County, UT

The radar

The Salt Lake City radar (KMTX), 65 km from the middle of the area, began a volume at 21:14 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, 9.2 hours before the alert went out and 345 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1778 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 129 m²/s²
0-3 km storm-relative helicity: 294 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this winter storm warning 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 storm warning went out at Dec 7, 5:02 AM MST, 9 hours 9 minutes earlier.

Area forecast discussion, Dec 7, 5:02 AM MST, 9 hours 9 minutes before

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The office that day

Everything else NWS Salt Lake City, UT issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Dec 7, 2:11 PM MST	Winter Weather Advisory	SLC	Carbon, Duchesne, Emery, Juab, Millard, Morgan and 6 more	30 hr

Nearby

Winter Storm Warnings in Utah, 2023 Every winter storm warning in 2023

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.