Alert archive / Utah / Special Weather Statements in 2021

Special Weather Statement, NWS Salt Lake City, UT

May 17, 2021Salt Lake County, Utah

NWS Salt Lake City, UT issued this special weather statement at May 17, 2021, 1:46 PM MDT for Salt Lake County, Utah. It was in force for 44 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 17, 2021, 1:46 PM MDT (19:46 UTC)
Expired: May 17, 2021, 2:30 PM MDT
In force: 44 min
Issued by: NWS Salt Lake City, UT

County Salt Lake County, UT

The radar

The Salt Lake City radar (KMTX), 103 km from the middle of the area, began a volume at 19:49 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 12:00Z, 7.8 hours before the alert went out and 35 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: 25 J/kg
Mixed-layer CIN: -345 J/kg
Mixed-layer LCL: 1620 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 11 m²/s²
0-3 km storm-relative helicity: 45 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 May 17, 9:33 AM MDT, 4 hours 13 minutes earlier.

Area forecast discussion, May 17, 9:33 AM MDT, 4 hours 13 minutes before

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Hazardous weather outlook, May 17, 5:27 AM MDT, 8 hours 19 minutes before

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In the hours before

Special weather statement, May 17, 1:08 PM MDT, 38 minutes before

Special Weather Statement
National Weather Service Salt Lake City UT
108 PM MDT Mon May 17 2021

UTZ127-128-172000-
South Central Utah UT-Bryce Canyon Country UT-
108 PM MDT Mon May 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN GARFIELD AND
NORTHWESTERN KANE COUNTIES UNTIL 200 PM MDT...

At 108 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm over Bryce Canyon National Park, or 29 miles west
of Escalante...moving southwest at 5 mph.

Pea size hail and winds in excess of 40 mph will be possible.

Locations impacted include...
Bryce Canyon National Park, Tropic, Cannonville and Rubys Inn.

This includes Utah Route 12 between mile markers 14 and 24.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If threatening weather approaches, take shelter in a sturdy building.

&&

LAT...LON 3754 11227 3757 11224 3757 11223 3770 11215
      3770 11208 3767 11204 3753 11207 3753 11224
TIME...MOT...LOC 1908Z 028DEG 6KT 3766 11212

CRK

Special weather statement, May 17, 1:46 PM MDT, 0 minutes before

Special Weather Statement
National Weather Service Salt Lake City UT
146 PM MDT Mon May 17 2021

UTZ108-111-172030-
Wasatch Back UT-Wasatch Mountains South of I-80 UT-
146 PM MDT Mon May 17 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN WASATCH...EAST
CENTRAL SALT LAKE AND SOUTHWESTERN SUMMIT COUNTIES UNTIL 230 PM
MDT...

At 145 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm near Park City...moving west at 10 mph.

Pea size hail and winds in excess of 40 mph will be possible.

Hail may cover area roads.  Use caution in areas with hail!

Locations impacted include...
Park City, Kamas, Francis, South Snyderville Basin, Big Cottonwood
Canyon, Samak, Little Cottonwood Canyon, Mill Creek Canyon, Alta,
Brighton, Snowbird, Snyderville, Marion, Hailstone, Jordanelle
Reservoir and Woodland.

This includes the following highways...
 US Route 40 between mile markers 3 and 11.
 Utah Route 35 between mile markers 0 and 2.
 Mirror Lake Highway between mile markers 0 and 1.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If threatening weather approaches, take shelter in a sturdy building.

&&

LAT...LON 4059 11124 4056 11169 4072 11170 4072 11167
      4070 11167 4068 11161 4071 11158 4070 11127
TIME...MOT...LOC 1945Z 086DEG 9KT 4066 11155

CRK

The office that day

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

Issued	Product	Office	Counties	Lasted
May 16, 7:30 PM MDT	Special Weather Statement	SLC	Salt Lake	60 min
May 17, 12:12 PM MDT	Fire Weather Watch	SLC	Beaver, Garfield, Iron, Kane, San Juan, Washington and 1 more	27 hr
May 17, 12:12 PM MDT	Red Flag Warning	SLC	Beaver, Carbon, Emery, Garfield, Iron, Juab and 9 more	6 days
May 17, 1:08 PM MDT	Special Weather Statement	SLC	Kane	52 min
May 17, 1:54 PM MDT	Special Weather Statement	SLC	Wasatch	51 min
May 17, 2:27 PM MDT	Areal Flood Advisory	SLC	Washington	93 min
May 17, 4:43 PM MDT	Special Weather Statement	SLC	Weber	32 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.