Alert archive / Utah / Special Weather Statements in 2020

Special Weather Statement, NWS Salt Lake City, UT

August 22, 2020

NWS Salt Lake City, UT issued this special weather statement at Aug 22, 2020, 5:13 PM MDT. It was in force for 32 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 22, 2020, 5:13 PM MDT (23:13 UTC)
Expired
Aug 22, 2020, 5:45 PM MDT
In force
32 min
Issued by
NWS Salt Lake City, UT

The radar

The Cedar City radar (KICX), 67 km from the middle of the area, began a volume at 23:14 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

Las Vegas, NV (KVEF), launched 12:00Z, 11.2 hours before the alert went out and 284 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-pSkew-T log-p diagram, Las Vegas, NV at 12:00Z on 2020-08-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 424 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Las Vegas, NV at 12:00Z on 2020-08-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -22 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
424 J/kg
Mixed-layer CIN
-402 J/kg
Mixed-layer LCL
2877 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
-22 m²/s²
0-3 km storm-relative helicity
15 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Aug 22, 3:12 PM MDT, 2 hours 1 minute earlier.

Area forecast discussion, Aug 22, 3:12 PM MDT, 2 hours 1 minute before
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Hazardous weather outlook, Aug 22, 5:33 AM MDT, 11 hours 40 minutes before
Hazardous Weather Outlook
National Weather Service Salt Lake City UT
533 AM MDT Sat Aug 22 2020

UTZ001>016-019>021-517-518-WYZ021-231200-
Cache Valley/Utah Portion-Northern Wasatch Front-
Salt Lake and Tooele Valleys-Southern Wasatch Front-
Great Salt Lake Desert and Mountains-Wasatch Mountain Valleys-
Wasatch Mountains I-80 North-Wasatch Mountains South of I-80-
Western Uinta Mountains-Wasatch Plateau/Book Cliffs-
Western Uinta Basin-Castle Country-San Rafael Swell-
Sanpete/Sevier Valleys-West Central Utah-Southwest Utah-
Utahs Dixie and Zion National Park-South Central Utah-
Glen Canyon Recreation Area/Lake Powell-Central Mountains-
Southern Mountains-Southwest Wyoming-
533 AM MDT Sat Aug 22 2020

This Hazardous Weather Outlook is for the western two thirds of
Utah and southwest Wyoming.

.DAY ONE...Today and Tonight

Isolated afternoon and early evening thunderstorms across portions
of southwest, central and eastern Utah will generate little or no
rain, but could produce gusty outflow winds. Critical fire weather
conditions will exist across southwest and central Utah due to
this thunderstorm activity through early this evening.

Smoke from wildfires in California will produce poor air quality
and reduced visibilities across portions of northern Utah again
today.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Afternoon and evening thunderstorms will remain a possibility
across the eastern half of Utah and southwest Wyoming Sunday.
Minimal rainfall is expected from these showers and thunderstorms.

Moisture is expected to increase across the area with an
increasing areal coverage of showers and thunderstorms early next
week. Measurable rainfall could result from some of these showers
and thunderstorms, which would be the first significant rainfall
in the month of August.

Somewhat drier conditions will return midweek, followed by an
increase in shower and thunderstorm activity at the end of the
week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed. Please relay any information
about observed severe weather to the NWS while following all
local, state, and CDC guidelines.

For more information from NOAA/s National Weather Service visit...
http://weather.gov/saltlakecity

For information on potential road travel impacts visit...
http://www.udottraffic.utah.gov/roadweatherforecast.aspx

In the hours before

Special weather statement, Aug 22, 3:06 PM MDT, 2 hours 7 minutes before
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Special weather statement, Aug 22, 3:31 PM MDT, 1 hour 42 minutes before
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Special weather statement, Aug 22, 5:13 PM MDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 22, 2:56 AM MDTRed Flag WarningSLCBeaver, Garfield, Iron, Kane, Millard, Piute and 4 more42 hr
Aug 22, 2:37 PM MDTRed Flag WarningSLCBeaver, Cache, Carbon, Duchesne, Emery, Garfield and 12 more30 hr
Aug 22, 3:06 PM MDTSpecial Weather StatementSLCPiute24 min
Aug 22, 3:31 PM MDTSpecial Weather StatementSLCSevier44 min

Nearby

Special Weather Statements in Utah, 2020Every special weather statement in 2020

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.