FNUS75 KSLC 211224

FWSSLC



Spot Forecast for Castle Peak RX...USFS

National Weather Service Salt Lake City UT

624 AM MDT Mon Sep 21 2026



Forecast is based on ignition time of 0700 MDT on September 21. 

If conditions become unrepresentative...contact the National Weather

Service.



.DISCUSSION...Through much of today, conditions will remain mild

and dry with light diurnal winds at the burn site. Into the

the morning Tuesday, primarily around 0600, chances for showers

and thunderstorms will increase with the highest probabilities

occurring around 1200-1800. Additionally, humidities will increase

notably throughout the day with winds primarily out of the south. 

Some strong to severe thunderstorms appear possible during this 

timeframe, with gusts to around 58mph possible as well as hail up 

to 1 inch and heavy rain. 



From Wednesday through Friday, conditions dry out once again

following the passage of a cold front. During this time, winds

will largely remain diurnal each day. 



.REST OF TODAY...



Sky/weather.........Partly cloudy (45-55 percent cloud cover). 

CWR.................0 percent. 

Chance of pcpn......0 percent. 

Chance of lightning.0 percent. 

Max temperature.....64-66. 

Min humidity........28-30 percent. 

Wind (20 ft)........East winds 6 to 8 mph becoming southwest 5 to 7 

                    mph in the afternoon. 

Mixing height.......6800 ft AGL (50-60th Percentile). 

Transport winds.....East around 9 mph becoming west around 12 mph 

                    in the afternoon. 

Clearing index......670. 



.TONIGHT...



Sky/weather.........Partly cloudy (55-65 percent cloud cover). 

CWR.................0 percent. 

Chance of pcpn......10 percent. 

Chance of lightning.5 percent. 

Min temperature.....42-44. 

Max humidity........72-74 percent. 

Wind (20 ft)........Downslope winds 5 to 9 mph. 

Mixing height.......600 ft AGL. 

Transport winds.....East 10 to 12 mph. 



.TUESDAY...



Sky/weather.........Partly cloudy (65-75 percent cloud cover) then 

                    becoming mostly cloudy (85-95 percent cloud 

                    cover). Scattered rain showers in the morning. 

                    Isolated thunderstorms late in the morning, 

                    then rain showers and scattered thunderstorms 

                    in the afternoon. 

CWR.................70 percent. 

Chance of pcpn......80 percent. 

Chance of lightning.34 percent. 

Max temperature.....Around 60. 

Min humidity........65-67 percent. 

Wind (20 ft)........East winds 7 to 9 mph becoming south with gusts 

                    to around 16 mph in the late morning and 

                    afternoon. Gusty and erratic winds expected 

                    near thunderstorms.

Mixing height.......6400 ft AGL (40-50th Percentile). 

Transport winds.....South 16 to 21 mph. 

Clearing index......1000+. 



$$

Forecaster...Worster

Requested by...Thomas Bolke

Type of request...PRESCRIBED

.TAG 2622015.3/SLC

.DELDT 09/21/26

.FormatterVersion 2.0.0

.EMAIL thomas.bolke@usda.gov,jason.bullough@usda.gov