FNUS75 KBYZ 240217
FWSBYZ

Spot Forecast for South HWY 1...BIA
National Weather Service Billings MT
817 PM MDT Sun Aug 23 2026

Forecast is based on forecast start time of 2000 MDT on August 23. 
If conditions become unrepresentative...contact the National Weather
Service.

Please contact our office if you have questions
or concerns with this forecast.

.DISCUSSION...

Showers and isolated thunderstorms in the fire vicinity through 
9pm and then a break. Another area of showers and isolated 
thunderstorms arrives around 10-1030pm, lasting through midnight 
if it holds together. Clearing expected behind the second line. 
Main threat will be isolated lightning and gusts to around 40 mph 
near shower/thunderstorm activity. Wetting rain chances remain low
with this activity but storms are wet and can produce a quick 
quarter inch of rain if they go right over the fire. Sunny and dry
with low MinRH values on Monday. Temperatures will be in the 
upper 80s and winds will be under 13 mph out of the west-
northwest. Dry conditions continue Monday night. Chambers 

.TONIGHT...

Sky/weather.........Mostly cloudy in the evening becoming partly
                    cloudy overnight. Chance of showers (40%) and
                    slight chance of thunderstorms in the evening.
                    Clearing by midnight. 
CWR.................10 percent. 
Chance of lightning.20 percent. 
Min temperature.....59-64. 
Max humidity........71-76 percent. 
Wind (20 ft)........ 
 Slope/valley.......Northwest winds 5 to 10 mph with gusts to 20 mph,
                    becoming west 5 to 10 mph overnight. Gusty and erratic
                    winds expected near thunderstorms. 
 Ridgetop...........Northwest around 10 mph, becoming west around 7 mph
                    overnight. 
Mixing height.......500 ft AGL. 
Transport winds.....West around 11 mph. 

.MONDAY...

Sky/weather.........Mostly sunny. 
CWR.................0 percent. 
Chance of lightning.0 percent. 
Max temperature.....84-89. 
Min humidity........18-23 percent. 
Wind (20 ft)........ 
 Slope/valley.......Northwest winds 6 to 12 mph. 
 Ridgetop...........Northwest around 9 mph. 
Mixing height.......7400 ft AGL in the afternoon. 
Transport winds.....West around 14 mph. 

.MONDAY NIGHT...

Sky/weather.........Partly cloudy then becoming mostly cloudy.
CWR.................0 percent. 
Chance of lightning.0 percent. 
Min temperature.....55-59. 
Max humidity........61-65 percent. 
Wind (20 ft)........ 
 Slope/valley.......Northeast winds 5 to 10 mph in the evening 
                    becoming light. 
 Ridgetop...........North around 5 mph. 
Mixing height.......600 ft AGL overnight. 
Transport winds.....Northeast around 8 mph. 

$$
Forecaster...Chambers
Requested by...Whitney Casebolt
Type of request...WILDFIRE
.TAG 2620346.0/BYZ
.DELDT 08/23/26
.FormatterVersion 2.0.0
.EMAIL mtbdc@firenet.gov