806
FNUS75 KSLC 161242
FWSSLC

Spot Forecast for South Willow Fire...USFS
National Weather Service Salt Lake City UT
642 AM MDT Mon Sep 16 2024

Forecast is based on forecast start time of 0600 MDT on September 16.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Southerly flow will continue to strengthen today ahead
of an approaching weather system, with stronger gusts beginning to
surface around 1000. As this system approaching, increasing moisture
will bring showers and a few thunderstorms around the general area
by mid afternoon, with a 40% chance that these storms move over the
fire area. Strong outflow winds and lightning will be the main
threats, with brief heavy rain possible. This storm system will
cross the area tonight, bring much cooler air for Tuesday, along
with a continued threat for showers and thunderstorms.

.TODAY...

Sky/weather.........Mostly cloudy (70-80 percent cloud cover). A
                    chance of showers and thunderstorms, mainly
                    after 1400.
Chance of pcpn......40 percent.
LAL.................1 until 1400, then 3.
Max temperature.....73-76.
Min humidity........22-25 percent.
Wind (20 ft)........South 6-10 mph with gusts 15-20 mph increasing
                    to 12-18 mph with gusts 28-35 mph after 1000.
                    Gusty and erratic winds to 50 mph expected near
                    thunderstorms in the afternoon.
Transport winds.....South 35 mph.
Haines Index........4.

.TONIGHT...

Sky/weather.........Mostly cloudy (70-80 percent cloud cover) with
                    rain showers likely and a chance of thunderstorms
                    in the evening, then becoming partly cloudy (60-70
                    percent cloud cover) with a chance of rain showers
                    and a slight chance of thunderstorms overnight.
Chance of pcpn......60 percent.
LAL.................3 until 2400, then 2.
Min temperature.....50-53.
Max humidity........44-47 percent.
Wind (20 ft)........South 6-10 mph. Gusty and erratic winds to 30 mph
                    possible near thunderstorms.
Transport winds.....South 30 mph in the evening decreasing to 15 mph
                    overnight.
Haines Index........3.

.TUESDAY...

Sky/weather.........Partly cloudy (60-70 percent cloud cover). A
                    chance of rain showers through the day. Slight
                    chance of thunderstorms in the afternoon.
Chance of pcpn......50 percent.
LAL.................1 until 1200, then 2.
Max temperature.....Around 60.
Min humidity........41-44 percent.
Wind (20 ft)........South 8-14 mph with gusts around 20 mph shifting
                    to the southwest after 1200. Gusty and erratic
                    winds to 40 mph possible near thunderstorms in the
                    afternoon.
Transport winds.....Southwest around 25 mph.
Haines Index........3.

$$
Forecaster...Seaman
Requested by...Wiatt Charlesworth
Type of request...WILDFIRE
.TAG 2422385.2/SLC
.DELDT 09/15/24
.FormatterVersion 2.0.0
.EMAIL wiatt.charlesworth@usda.gov