Excessive Heat Warning 3, NWS Salt Lake City, UT

Area Forecast Discussion
National Weather Service Salt Lake City UT
822 AM MDT Tue Jul 28 2020

.SYNOPSIS...Lingering moisture will maintain a threat for
showers and thunderstorms today. High pressure will become
established for the remainder of the week and into the upcoming
weekend resulting in hot and dry conditions.

&&

.DISCUSSION...A few showers remain across extreme northern Utah
and southwest Wyoming this morning but are expected to diminish by
10 am as the weak dynamics driving the showers lifts northeast.
Have removed the mention of showers farther south in the wake of
these dynamics. Clouds have also cleared south of the Ogden to
western Uintas line so updated the forecast to sunny skies this
morning.

The dew points are in the upper 40s and lower 50s across much of
the state yet this morning so with day time heating feel there is
justification for having a threat of showers and thunderstorms
over the higher terrain of central and southern Utah, and more so
across northern Utah where the 500mb thermal trough is moving
across today.

&&

.AVIATION...An isolated shower or thunderstorms is possible at or
near KSLC between 19Z and 23Z. The main impact would be gusty and
erratic winds. Southeast winds this morning will shift to
northwest at about 19Z.

&&

.SLC WATCHES/WARNINGS/ADVISORIES...
UT...None.
WY...None.
&&

PUBLIC...Struthwolf
AVIATION...Struthwolf

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

For frequently asked questions about the Area Forecast Discussion
visit...
http://weather.gov/saltlakecity/general/afd_faqs.php

Hazardous Weather Outlook
National Weather Service Salt Lake City UT
416 AM MDT Tue Jul 28 2020

UTZ001>016-019>021-517-518-WYZ021-291200-
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-
416 AM MDT Tue Jul 28 2020

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

.DAY ONE...Today and Tonight

Showers and thunderstorms will linger across the outlook area
through this evening. These storms will be most numerous north of
I-80, while trending more isolated and confined to the mountains
further south into central and southern Utah. Frequent lightning,
locally heavy rain and strong gusty winds can be expected with
these storms.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

High pressure will develop across the region Wednesday, then
strengthen through the remainder of the week. This will result in
a warming and drying trend, with high temperatures approaching 100
degrees in Salt Lake City, and exceeding 110 degrees around St
George by Friday.

.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

Special Weather Statement
National Weather Service Salt Lake City UT
200 PM MDT Tue Jul 28 2020

UTZ001-002-005-007-282100-
Cache Valley/Utah Portion UT-Wasatch Mountains I-80 North UT-
Great Salt Lake Desert and Mountains UT-Northern Wasatch Front UT-
200 PM MDT Tue Jul 28 2020

...SIGNIFICANT WEATHER ADVISORY FOR CACHE AND NORTHEASTERN BOX ELDER
COUNTIES UNTIL 300 PM MDT...

At 159 PM MDT, National Weather Service Doppler radar indicated a
strong thunderstorm 9 miles south of Snowville...moving east at 15
mph.

Pea size hail and wind gusts of 40 to 55 mph will be possible.

Locations impacted include...
Logan, Tremonton, Snowville, Cache, Smithfield, Hyrum, Wellsville,
Lewiston, Bear River City, Clarkston, Trenton, Plymouth, Howell, Utah
State University, Benson, Peter, Riverside, North Logan, Providence
and Nibley.

This includes the following highways...
 Interstate 15 between mile markers 369 and 399.
 Interstate 84 between mile markers 3 and 42.
 US Route 89 between mile markers 459 and 488.
 Utah Route 30 between mile markers 72 and 90.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Heavy rainfall is also occurring with this storm, and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 4166 11291 4198 11312 4198 11151 4154 11164
TIME...MOT...LOC 1959Z 289DEG 12KT 4184 11270

MS

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