Evanston, Wyoming 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

712
FXUS65 KSLC 041859
AFDSLC

Area Forecast Discussion
National Weather Service Salt Lake City UT
1259 PM MDT Sat Jul 4 2026

.KEY MESSAGES, Issued 1256 PM MDT Sat Jul 4 2026...



- Continued hot and dry through the weekend with isolated mountain
  thunderstorms possible. Temperatures Sunday will run 5-8 degrees
  above normal across northern Utah, with a 25% chance KSLC
  reaches 100F Sunday afternoon. Temperatures across southern Utah
  will remain near normal for early July.

- An increase in mid level moisture will bring a chance of high
  based showers and dry thunderstorms Monday across the area, and
  lingering into Tuesday across the north.

- Hot and dry conditions follow for mid-week, before a
  strengthening area of high pressure brings additional warming
  and potentially record high temperatures heading into next
  weekend.

&&

.DISCUSSION, Issued 1256 PM MDT Sat Jul 4 2026...


Shortwave ridging amplifying across the region early this
afternoon is maintaining a hot and very dry airmass across the
forecast area. Temperatures trending another 3-5 degrees warmer
will allow most northern, central and southwest valleys to reach
the low-mid 90s this afternoon, while St George/Zion Canyon top
out in the 100-103 range.

This ridge will further amplify as it shifts east Sunday,
allowing for another 2-4 degrees of warming across northern Utah,
and pushing KSLC close to its first 100F reading of the year (25%
probability per NBM guidance). Meanwhile, mid level moisture will
begin spreading into southwest Utah later Sunday afternoon into
Sunday evening. Forecast soundings and time-height plots suggest
this moisture remains above 500mb which will limit lightning
potential, but will result in gusty outflow driven winds spreading
into southwest Utah during the afternoon, then central Utah during
the evening.

This increase in moisture is owing in part to a shortwave lifting
through Nevada later Sunday into early Monday. This feature will
be well north of the forecast area Monday afternoon, thus despite
lingering moisture (largely confined above 550mb per forecast
soundings), limited large scale forcing will limit the potential
for high based convection to spread off the terrain Monday
afternoon and evening. Drier air spreading into the region Tuesday
will focus any lingering convective threat to northern and perhaps
eastern portions of the forecast area.

Beyond Tuesday, a subtropical ridge across the Desert Southwest
will gradually expand/elongate through the week, then drift north
into the Great Basin region by next weekend. This will maintain a
hot and dry airmass through most of the week across the forecast
area as any appreciable moisture remains confined to the south of
the ridge axis. With this building ridge, afternoon temperatures
next weekend will exceed triple digits across most northern Utah
valleys, and push the 110F mark near St George. Eventually deeper
moisture rotating around this ridge should reach the forecast
area, but not likely before the July 14th-15th timeframe.



&&

.AVIATION, Issued 1256 PM MDT Sat Jul 4 2026...


KSLC...VFR conditions are expected to persist through the TAF
period. Typical diurnal wind shifts are forecast with winds
clocking to southerly around 04z.

REST OF UTAH AND SOUTHWEST WYOMING...VFR conditions are expected
to persist through the TAF period. Typical diurnal wind shifts are
forecast at each site with thunderstorm development remaining
over the high terrain.

&&

.FIRE WEATHER...A hot, very dry and unstable airmass will remain in
place through the weekend across the state. Single digit afternoon
RH values will be common state-wide across low and mid elevations
this afternoon and again Sunday. Poor to in places non- existent
RH recovery is also expected tonight. Increasing southerly flow
later Sunday will also bring gusty winds across southwest Utah,
which when combined with the hot and very dry airmass may result
in isolated critical fire weather conditions. Late Sunday high
based moisture will spread into the state, bringing a threat for
isolated dry thunderstorms Monday afternoon. These storms will
largely remain over the higher terrain across the state. With this
increase in moisture, RH values will trend higher Monday. This
moisture will then be swept out of the region beginning Tuesday,
followed by hot and very dry conditions returning through most of
the upcoming week. A strengthening area of high pressure will the
potential for record heat by next weekend across the state. Any
chance for robust monsoon moisture doesn`t look to arrive until
around the 14th-15th of July.

&&

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

$$

PUBLIC...Seaman
AVIATION...Worster
FIRE WEATHER...Seaman

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