541
FNUS75 KTFX 200235
FWSTFX

Spot Forecast for Sand Bar 2...U.S. Forest Service
National Weather Service Great Falls MT
835 PM MDT Tue Aug 19 2025

Forecast is based on forecast start time of 2100 MDT on August 19.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...

Isolated to scattered thunderstorms are expected through the rest of the
evening with the chance for thunder around the fire between 9 PM and
12 AM. These storms may produce localized heavy downpours but the main
concern will be gusty and erratic winds and lightning. Outside of
thunderstorm activity, winds will remain light and variable through the
overnight hours.

Temperatures overnight will drop down into the upper 50s with humidities
recovering to around 55%. Wednesday will be warm and dry with highs near
80 and minimum RH in the mid 20s. A cold front is expected to arrive late
Wednesday afternoon which will provide a wind shift as well as a chance
for thunderstorms into the evening hours.


.REST OF TONIGHT...

Sky/weather.........Mostly cloudy (65-75 percent) then becoming
                    partly cloudy (30-40 percent). Chance of
                    showers and thunderstorms late in the evening,
                    then slight chance of showers and thunderstorms
                    overnight.
CWR.................5 percent.
Chance of thunder...39 percent.
Min temperature.....56-61.
Max humidity........49-54 percent.
Wind (20 ft)........
 Slope/valley.......North winds around 5 mph shifting to the
                    northwest early in the morning. Gusty and
                    erratic winds expected near thunderstorms.
 Ridgetop...........North 5 to 10 mph increasing to 10 to 15 mph
                    late in the evening, then decreasing to around
                    5 mph after 3 am.
Mixing height.......0 ft AGL.
Transport winds.....North 5 to 10 mph.


.WEDNESDAY...

Sky/weather.........Mostly sunny (30-40 percent). Slight chance of
                    showers and thunderstorms late in the
                    afternoon.
CWR.................5 percent.
Chance of thunder...15 percent.
Max temperature.....75-80.
Min humidity........22-27 percent.
Wind (20 ft)........
 Slope/valley.......West winds 5 to 10 mph. Gusty and erratic winds
                    expected near thunderstorms late in the
                    afternoon.
 Ridgetop...........North around 5 mph shifting to the southwest
                    early in the morning, then increasing to 15 to
                    20 mph early in the afternoon shifting to the
                    west around 25 mph late in the afternoon.
Mixing height.......8000 ft AGL.
Transport winds.....West 5 to 10 mph increasing to 15 to 20 mph.


.WEDNESDAY NIGHT...

Sky/weather.........Mostly clear (20-30 percent).
CWR.................5 percent.
Chance of thunder...14 percent.
Min temperature.....48-53.
Max humidity........60-65 percent.
Wind (20 ft)........
 Slope/valley.......West winds 10 to 15 mph becoming light.
 Ridgetop...........West 25 to 30 mph decreasing to 20 to 25 mph in
                    the late evening and overnight.
Mixing height.......0 ft AGL.
Transport winds.....West 15 to 20 mph becoming northwest 5 to 10
                    mph in the late evening and overnight.


.THURSDAY...

Sky/weather.........Sunny (15-25 percent).
CWR.................0 percent.
Chance of thunder...1 percent.
Max temperature.....69-74.
Min humidity........16-21 percent.
Wind (20 ft)........
 Slope/valley.......Light winds becoming north around 5 mph late in
                    the morning, then shifting to the west in the
                    afternoon.
 Ridgetop...........West 10 to 15 mph.
Mixing height.......8000 ft AGL.
Transport winds.....Northwest 5 to 10 mph shifting to the west 10
                    to 15 mph in the afternoon.


$$
Forecaster...Glinskas
Requested by...Richard Smith
Type of request...WILDFIRE
.TAG 2520279.0/TFX
.DELDT 08/19/25
.FormatterVersion 2.0.0
.EMAIL MTHDC@firenet.gov, tfx.ops@noaa.gov