621
FNUS75 KSLC 132123
FWSSLC

Spot Forecast for Gap Fire...USFS
National Weather Service Salt Lake City UT
323 PM MDT Sun Jul 13 2025

Forecast is based on forecast start time of 0600 MDT on July 14.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Heat will continue to increase over the fire area alongside
 dry afternoon conditions as high pressure builds over Utah.
Afternoon highs will be reaching into the upper-90s on Monday and
right around 100 on Tuesday. There is a chance for isolated high-
based showers in the region both Monday and Tuesday afternoon,
which may bring potential for gusty and erratic outflow winds in
excess of 30-40 mph. The probability for these outflows will be
higher on Tuesday. Outside of any outflows, winds are expected to
remain terrain driven during the overnight and early morning hours
before taking on a west to northwest flow on Monday, then to an
increasingly breezy west to southwest flow on Tuesday. Poor
overnight recoveries are expected each day, with areas outside of
valley bottoms recovering between 25-30 percent. Poor recoveries
into Tuesday morning paired with the hot temperatures, very dry
afternoon conditions, and breezy southwest winds will generate
elevated to near critical fire weather conditions.


.MONDAY...

Sky/weather.........Mostly sunny (10-20 percent cloud cover).
CWR.................0 percent.
Chance of pcpn......10 percent.
Chance of lightning.5 percent.
Max temperature.....97-99.
Min humidity........8-10 percent.
Wind (20 ft)........Terrain driven (downslope) 3-7 mph in the morning,
becoming west to northwest 6-11 mph in the late morning/ early afternoon.
Mixing height.......15500 ft AGL
   Climatology......97-99th Percentile.
Transport winds.....East around 7 mph becoming west around 15 mph
                    in the afternoon.

.MONDAY NIGHT...

Sky/weather.........Mostly clear (15-25 percent cloud cover).
CWR.................0 percent.
Chance of pcpn......0 percent.
Chance of lightning.4 percent.
Min temperature.....66-68.
Max humidity........24-26 percent on lower slopes and above. Around 45%
at the valley bottom.
Wind (20 ft)........Northwest winds 6-10 mph becoming terrain driven
(downslope) 4-7 mph overnight.
Transport winds.....Northwest around 14 mph becoming south around 8
                    mph overnight.

.TUESDAY...

Sky/weather.........Partly cloudy (30-40 percent cloud cover) then
                    becoming mostly sunny (20-30 percent cloud
                    cover).
CWR.................0 percent.
Chance of pcpn......15 percent.
Chance of lightning.10 percent.
Max temperature.....Around 100.
Min humidity........10-12 percent.
Wind (20 ft)........Terrain driven (downslope) 4-7 mph in the morning becoming west
to southwest 10-14 mph with around 20 mph in the afternoon. Gusty
                    and erratic winds expected near thunderstorms/ high-based showers.
Mixing height.......16600 ft AGL
   Climatology......99-100th Percentile.
Transport winds.....Southwest 14 to 22 mph.

.TUESDAY NIGHT...

Sky/weather.........Mostly clear (20-30 percent cloud cover).
CWR.................0 percent.
Chance of pcpn......10 percent before 2200, then 0 percent.
Chance of lightning.5 percent before 2200, then 0 percent.
Min temperature.....64-67.
Max humidity........31-35 percent on lower slopes and above. Around 50% at
the valley bottom.
Wind (20 ft)........West to southwest winds 9-13 mph with gusts to around
                    18-20 mph before 2100, then becoming terrain driven
(downslope) 4-7 mph.
Transport winds.....West to southwest around 12-15 mph

$$
Forecaster...Webber
Requested by...Sierra Sampson
Type of request...WILDFIRE
.TAG 2517913.0/SLC
.DELDT 07/13/25
.FormatterVersion 2.0.0
.EMAIL sierra.sampson@usda.gov