Alert archive / Utah / Special Weather Statements in 2021

Special Weather Statement, NWS Salt Lake City, UT

May 15, 2021

NWS Salt Lake City, UT issued this special weather statement at May 15, 2021, 6:30 PM MDT. It was in force for 45 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: May 15, 2021, 6:30 PM MDT (00:30 UTC)
Expired: May 15, 2021, 7:15 PM MDT
In force: 45 min
Issued by: NWS Salt Lake City, UT

The radar

The Salt Lake City radar (KMTX), 116 km from the middle of the area, began a volume at 00:33 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

Salt Lake City I, UT (KSLC), launched 00:00Z, 0.5 hours before the alert went out and 168 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: 530 J/kg
Mixed-layer CIN: -73 J/kg
Mixed-layer LCL: 2686 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: -20 m²/s²
0-3 km storm-relative helicity: 179 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

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 May 15, 3:32 PM MDT, 2 hours 58 minutes earlier.

Area forecast discussion, May 15, 3:32 PM MDT, 2 hours 58 minutes before

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Hazardous weather outlook, May 15, 8:39 AM MDT, 9 hours 51 minutes before

Hazardous Weather Outlook
National Weather Service Salt Lake City UT
839 AM MDT Sat May 15 2021

UTZ101>131-WYZ021-161300-
Great Salt Lake Desert and Mountains-Tooele and Rush Valleys-
Eastern Box Elder County-Northern Wasatch Front-Salt Lake Valley-
Utah Valley-Cache Valley/Utah Portion-Wasatch Back-
Bear Lake and Bear River Valley-Wasatch Mountains I-80 North-
Wasatch Mountains South of I-80-Western Uinta Mountains-
Wasatch Plateau/Book Cliffs-Western Uinta Basin-
Western Millard and Juab Counties-Eastern Juab/Millard Counties-
Central Mountains-Sanpete Valley-Sevier Valley-Castle Country-
San Rafael Swell-Southwest Utah-Lower Washington County-
Zion National Park-Southern Mountains-Upper Sevier River Valleys-
Bryce Canyon Country-South Central Utah-
Capitol Reef National Park and Vicinity-Western Canyonlands-
Glen Canyon Recreation Area/Lake Powell-Southwest Wyoming-
839 AM MDT Sat May 15 2021

This Hazardous Weather Outlook is for portions of central Utah...
northern Utah...southern Utah...southwest Utah and southwest
Wyoming.

.DAY ONE...Today and Tonight

High based showers and thunderstorms are possible across much of
northern Utah as well as the higher terrain of central and
southern Utah and adjacent valleys. The main threat for most
locations will be gusty, microburst winds. Areas near the
Utah/Nevada border and across far northeastern Utah and Uinta
County Wyoming may also see small hail.

Critical fire weather conditions will continue across southern
Utah today due to gusty winds and low humidity.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Critical fire weather conditions are expected again across
southern Utah due to gusty winds and low humidity.

Isolated to scattered showers and thunderstorms across northern
Utah and central Utah on Sunday and spreading into southern Utah
on Monday will be capable of producing gusty winds.

.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, May 15, 1:32 PM MDT, 4 hours 58 minutes before

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Special weather statement, May 15, 1:44 PM MDT, 4 hours 46 minutes before

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Special weather statement, May 15, 2:30 PM MDT, 4 hours before

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Special weather statement, May 15, 4:25 PM MDT, 2 hours 5 minutes before

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Special weather statement, May 15, 5:48 PM MDT, 42 minutes before

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Special weather statement, May 15, 6:30 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.

Issued	Product	Office	Counties	Lasted
May 16, 1:07 PM MDT	Special Weather Statement	SLC	Salt Lake	38 min
May 16, 1:22 PM MDT	Severe Thunderstorm Warning	SLC	Davis, Salt Lake, Tooele	23 min
May 16, 1:52 PM MDT	Special Weather Statement	SLC	Davis	38 min
May 16, 1:55 PM MDT	Special Weather Statement	SLC	Salt Lake	35 min
May 16, 1:58 PM MDT	Special Weather Statement	SLC	Weber	47 min
May 16, 2:03 PM MDT	Severe Thunderstorm Warning	SLC	Morgan, Weber	27 min
May 16, 2:07 PM MDT	Special Weather Statement	SLC		38 min
May 16, 2:20 PM MDT	Special Weather Statement	SLC	Salt Lake	40 min
May 16, 2:29 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Weber	31 min
May 16, 2:31 PM MDT	Special Weather Statement	SLC	Davis	44 min
May 16, 2:50 PM MDT	Special Weather Statement	SLC		55 min
May 16, 3:00 PM MDT	Severe Thunderstorm Warning	SLC	Box Elder, Weber	30 min
May 16, 3:04 PM MDT	Special Weather Statement	SLC	Tooele	41 min
May 16, 3:24 PM MDT	Severe Thunderstorm Warning	SLC	Tooele	51 min
May 16, 3:30 PM MDT	Special Weather Statement	SLC	Cache	45 min
May 16, 3:32 PM MDT	Special Weather Statement	SLC	Weber	43 min
May 16, 4:15 PM MDT	Special Weather Statement	SLC	Box Elder	45 min
May 16, 4:19 PM MDT	Special Weather Statement	SLC	Box Elder	41 min
May 16, 4:39 PM MDT	Special Weather Statement	SLC	Box Elder	51 min
May 16, 5:07 PM MDT	Special Weather Statement	SLC	Box Elder	53 min

Nearby

Special Weather Statements in Utah, 2021 Every special weather statement 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.