Alert archive / Utah / Winter Weather Advisories in 2021
Winter Weather Advisory 20, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this winter weather advisory at Oct 25, 2021, 4:06 AM MDT for 24 counties in Utah; Uinta County, Wyoming. It took effect at Oct 25, 2021, 6:00 PM MDT. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- Oct 25, 2021, 4:06 AM MDT (10:06 UTC)
- In effect from
- Oct 25, 2021, 6:00 PM MDT
- Expired
- Oct 26, 2021, 12:00 PM MDT
- In force
- 18 hr
- Issued by
- NWS Salt Lake City, UT
All 25 counties
Beaver County, UT, Box Elder County, UT, Cache County, UT, Carbon County, UT, Davis 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, Salt Lake County, UT, Sanpete County, UT, Sevier County, UT, Summit 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), 181 km from the middle of the area, began a volume at 10:08 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 00:00Z, 10.1 hours before the alert went out and 292 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
- 2254 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 71 m²/s²
- 0-3 km storm-relative helicity
- 382 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 Oct 24, 10:02 PM MDT, 6 hours 4 minutes earlier.
Area forecast discussion, Oct 24, 10:02 PM MDT, 6 hours 4 minutes before
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Local storm report, Oct 24, 11:21 PM MDT, 4 hours 45 minutes before
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</html>Local storm report, Oct 25, 12:28 AM MDT, 3 hours 38 minutes before
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</html>Local storm report, Oct 25, 3:04 AM MDT, 1 hour 2 minutes before
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<main class="wrap">
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<div class="status" id="status">Temporary Notice</div>
<h1 id="headline">This service is currently unavailable.</h1>
<p id="message1">
The site you requested is temporarily down for maintenance or an unexpected outage.
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<p id="message2">
Please try again in a few minutes.
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If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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</html>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.