810
FNUS75 KSLC 192355
FWSSLC

Spot Forecast for D4 Piles...US Forest Service
National Weather Service Salt Lake City UT
455 PM MST Wed Nov 19 2025

Forecast is based on ignition time of 1000 MST on November 20.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Periodic snow showers will will continue through the
day tomorrow as the storm system continues to slowly exit the
area. Snow accumulations of around 2 inches with around 0.2 inches
of water equivalent are expected overnight. Tomorrow into
tomorrow night, amounts will generally remain minor, with less
than 2 inches of snow with water equivalents of generally 0.15
inches or less. Mixing heights will remain on the low side, but
transport winds will be weaker tomorrow. As a result, the
clearing index will be well below 500. Friday will be drier,
although there is an outside chance of some light showers. Expect
little change in clearing index compared to Thursday as mixing
heights remain low and transport winds remain light.


.THURSDAY...

Sky/weather.........Mostly cloudy (75-85 percent cloud cover).
                    Chance of snow.
CWR.................30 percent.
Chance of pcpn......50 percent.
Chance of lightning.5 percent.
Max temperature.....30-33.
Min humidity........90-93 percent.
Wind (20 ft)........South-southeast winds 3-7 mph.
Mixing height.......1600 ft AGL.
   Climatology......20-30th Percentile.
Transport winds.....South around 9 mph.
Clearing index......160.

.THURSDAY NIGHT...

Sky/weather.........Mostly cloudy (70-80 percent cloud cover).
                    Slight chance of snow.
CWR.................15 percent.
Chance of pcpn......20 percent.
Chance of lightning.5 percent.
Min temperature.....17-20.
Max humidity........97-100 percent.
Wind (20 ft)........North-northeast winds 2-5 mph.
Mixing height.......0 ft AGL.
Transport winds.....Southwest around 6 mph.

.FRIDAY...

Sky/weather.........Partly cloudy (60-70 percent cloud cover).
                    Slight chance of snow in the afternoon.
CWR.................10 percent.
Chance of pcpn......20 percent.
Chance of lightning.5 percent.
Max temperature.....30-33.
Min humidity........82-85 percent.
Wind (20 ft)........Southeast winds 2-6 mph increasing to
                    4-8 mph after 1000.
Mixing height.......2300 ft AGL.
   Climatology......20-30th Percentile.
Transport winds.....Southeast 7 to 8 mph.
Clearing index......150.

$$
Forecaster...Cheng
Requested by...Shane Woolsey
Type of request...PRESCRIBED
.TAG 2526425.0/SLC
.DELDT 11/19/25
.FormatterVersion 2.0.0
.EMAIL shane.woolsey@usda.gov