FNUS55 KTFX 180750 FWFTFX Fire Weather Planning Forecast for North-Central Montana National Weather Service Great Falls MT 150 AM MDT Mon May 18 2026 .DISCUSSION... Northwest flow will remain in place over the Northern Rockies through the work week, with daily chances for showers and occasional thunderstorms. The best chance for widespread precipitation looks to arrive on Wednesday as a compact disturbance moves southeast and over the region, with Fire Weather Zones 114 and 117 likely to see the highest precipitation at this time. Below normal temperatures today will warm to near normal by Tuesday, with near to slightly below normal temperatures expected through the remainder of the work week. - Moldan MTZ112-182215- Eastern Glacier/Toole/Central/Eastern Pondera/Liberty- 150 AM MDT Mon May 18 2026 .TODAY... * Sky/Weather...........Mostly sunny. Patchy fog in the morning. Slight chance of rain in the afternoon. * Chance Lightning.......0 percent. * Max Temperature.......50-55...43-48 higher elevations. 24 hr trend......15 degrees up...9 degrees up higher elevations. * Min Humidity..........37-47 percent...50-60 percent higher elevations. 24 hr trend......45 percent down...16 percent down higher elevations. * Wind (20 FT). Lower Elevations...North winds 10 to 15 mph shifting to the east in the afternoon. Ridges.............North winds 10 to 15 mph. * Mixing Height.........500-1500 ft agl increasing to 7500-8000 ft agl. * Transport Winds.......North 15 to 20 mph. * CWR...................0 percent. .TONIGHT... * Sky/Weather...........Partly cloudy. Slight chance of rain in the evening. * Chance Lightning.......0 percent. * Min Temperature.......27-33. 24 hr trend......7 degrees up. * Max Humidity..........77-87 percent. 24 hr trend......17 percent down. * Wind (20 FT). Lower Elevations...South winds 15 to 20 mph. Ridges.............South winds 15 to 20 mph. * Mixing Height.........6500-7500 ft agl decreasing to 500-1000 ft agl. * Transport Winds.......South 15 to 20 mph increasing to southwest around 25 mph after midnight. * CWR...................0 percent. .TUESDAY... * Sky/Weather...........Partly sunny. Slight chance of rain in the afternoon. * Chance Lightning.......0 percent. * Max Temperature.......59-65...49-57 higher elevations. 24 hr trend......10 degrees up. * Min Humidity..........31-39 percent...45-55 percent higher elevations. 24 hr trend......5 percent down. * Wind (20 FT). Lower Elevations...West winds 20 to 25 mph. Ridges.............West winds 20 to 25 mph. * Mixing Height.........500-2000 ft agl increasing to 7500-9000 ft agl. * Transport Winds.......West 25 to 30 mph. * CWR...................0 percent. .FORECAST DAYS 3 THROUGH 7...... .WEDNESDAY...Mostly cloudy. Chance of rain. Lows in the upper 30s. Highs in the upper 50s. Northwest winds 20 to 25 mph. .THURSDAY...Partly cloudy. Chance of rain. Lows in the mid 30s. Highs in the lower 60s. Northwest winds 15 to 20 mph. .FRIDAY...Mostly cloudy. Slight chance of rain. Lows around 40. Highs in the mid 60s. West winds 15 to 20 mph. .SATURDAY...Partly cloudy. Lows in the lower 40s. Highs in the lower 70s. .SUNDAY...Partly cloudy. Lows in the mid 40s. Highs in the lower 70s. $$ MTZ113-182215- Hill and Blaine Counties- 150 AM MDT Mon May 18 2026 .TODAY... * Sky/Weather...........Partly sunny. * Chance Lightning.......0 percent. * Max Temperature.......45-54...40-45 higher elevations. 24 hr trend......5 degrees up. * Min Humidity..........36-46 percent. 24 hr trend......20 percent down...33 percent down higher elevations. * Wind (20 FT). Lower Elevations...North winds 15 to 20 mph. Ridges.............North winds 15 to 20 mph. * Mixing Height.........2000-3500 ft agl increasing to 7500-8000 ft agl. * Transport Winds.......North 20 to 25 mph. * CWR...................0 percent. .TONIGHT... * Sky/Weather...........Partly cloudy. * Chance Lightning.......0 percent. * Min Temperature.......24-30. 24 hr trend......1 degree down. * Max Humidity..........79-89 percent...70-80 percent higher elevations. 24 hr trend......16 percent down...22 percent down higher elevations. * Wind (20 FT). Lower Elevations...Southeast winds 10 to 15 mph. Ridges.............East winds 10 to 15 mph shifting to the south after midnight. * Mixing Height.........6500-7500 ft agl decreasing to BELOW 1000 ft agl. * Transport Winds.......East 15 to 20 mph shifting to the south after midnight. * CWR...................0 percent. .TUESDAY... * Sky/Weather...........Partly sunny. Slight chance of rain in the afternoon. * Chance Lightning.......0 percent. * Max Temperature.......61-66...53-58 higher elevations. 24 hr trend......12 degrees up. * Min Humidity..........27-33 percent. 24 hr trend......8 percent down. * Wind (20 FT). Lower Elevations...Southwest winds 15 to 20 mph. Ridges.............South winds 15 to 20 mph shifting to the southwest in the afternoon. * Mixing Height.........500-2000 ft agl increasing to 8000-9500 ft agl. * Transport Winds.......Southwest 15 to 20 mph. * CWR...................0 percent. .FORECAST DAYS 3 THROUGH 7...... .WEDNESDAY...Mostly cloudy. Chance of showers and slight chance of thunderstorms. Lows in the lower 40s. Highs in the lower 60s. West winds 15 to 20 mph. .THURSDAY...Mostly cloudy. Chance of rain. Lows in the upper 30s. Highs in the mid 60s. Northwest winds 15 to 20 mph. .FRIDAY...Partly cloudy. Slight chance of rain. Lows around 40. Highs in the upper 60s. South winds 10 to 15 mph. .SATURDAY...Partly cloudy. Lows in the lower 40s. Highs in the mid 70s. .SUNDAY...Partly cloudy. Lows in the mid 40s. Highs in the upper 70s. $$ MTZ114-182215- Lewis and Clark National Forest Rocky Mountain District- Rocky Mountain Front- 150 AM MDT Mon May 18 2026 .TODAY... * Sky/Weather...........Mostly sunny. Patchy fog in the morning. Chance of showers, snow showers and slight chance of thunderstorms in the afternoon. * Chance Lightning.......20 percent. * Max Temperature.......48-54...35-45 higher elevations. 24 hr trend......15 degrees up...8 degrees up higher elevations. * Min Humidity..........40-50 percent...54-64 percent higher elevations. 24 hr trend......30 percent down...2 percent down higher elevations. * Wind (20 FT). Lower Elevations...North winds around 5 mph shifting to the east in the afternoon. Ridges.............Northwest winds 5 to 10 mph. * Mixing Height.........BELOW 1000 ft agl increasing to 6500-7500 ft agl. * Transport Winds.......North 15 to 20 mph. * CWR...................0 percent. .TONIGHT... * Sky/Weather...........Partly cloudy. Slight chance of rain and snow in the evening. * Chance Lightning.......0 percent. * Min Temperature.......25-33. 24 hr trend......2 degrees up. * Max Humidity..........79-89 percent. 24 hr trend......23 percent down...11 percent down higher elevations. * Wind (20 FT). Lower Elevations...South winds around 5 mph increasing to southwest 15 to 20 mph after midnight. Ridges.............West winds 10 to 15 mph. * Mixing Height.........6000-6500 ft agl decreasing to 500-1000 ft agl. * Transport Winds.......Southwest 15 to 20 mph. * CWR...................0 percent. .TUESDAY... * Sky/Weather...........Mostly sunny. Slight chance of rain in the afternoon. * Chance Lightning.......0 percent. * Max Temperature.......56-64...42-52 higher elevations. 24 hr trend......10 degrees up. * Min Humidity..........32-39 percent...52-62 percent higher elevations. 24 hr trend......7 percent down. * Wind (20 FT). Lower Elevations...West winds 20 to 25 mph. Ridges.............West winds 20 to 25 mph. * Mixing Height.........500-2000 ft agl increasing to 8000-9000 ft agl. * Transport Winds.......West around 25 mph. * CWR...................0 percent. .FORECAST DAYS 3 THROUGH 7...... .WEDNESDAY...Mostly cloudy. Showers likely, slight chance of thunderstorms and snow. Lows in the upper 30s. Highs in the mid 50s. West winds 20 to 25 mph. .THURSDAY...Mostly cloudy. Rain and snow likely. Lows in the mid 30s. Highs in the upper 50s. Northwest winds 15 to 20 mph. .FRIDAY...Partly cloudy. Slight chance of rain. Lows in the upper 30s. Highs in the lower 60s. West winds 10 to 15 mph. .SATURDAY...Partly cloudy. Lows around 40. Highs in the upper 60s. .SUNDAY...Partly cloudy. Lows in the mid 40s. Highs around 70. $$ MTZ115-182215- Chouteau and Fergus Counties- 150 AM MDT Mon May 18 2026 .TODAY... * Sky/Weather...........Partly sunny. * Chance Lightning.......0 percent. * Max Temperature.......45-54...38-44 higher elevations. 24 hr trend......12 degrees up...2 degrees up higher elevations. * Min Humidity..........36-46 percent...47-57 percent higher elevations. 24 hr trend......34 percent down...18 percent down higher elevations. * Wind (20 FT). Lower Elevations...North winds 15 to 20 mph. Ridges.............Northwest winds 20 to 25 mph decreasing to 10 to 15 mph in the afternoon. * Mixing Height.........1500-3000 ft agl increasing to 6000-7500 ft agl. * Transport Winds.......North 20 to 25 mph. * CWR...................0 percent. .TONIGHT... * Sky/Weather...........Partly cloudy. * Chance Lightning.......0 percent. * Min Temperature.......23-30. 24 hr trend......3 degrees down. * Max Humidity..........76-86 percent. 24 hr trend......14 percent down. * Wind (20 FT). Lower Elevations...East winds 10 to 15 mph shifting to the south after midnight. Ridges.............Northeast winds 10 to 15 mph shifting to the south after midnight. * Mixing Height.........6500-7000 ft agl decreasing to BELOW 1000 ft agl. * Transport Winds.......East 15 to 20 mph shifting to the south after midnight. * CWR...................0 percent. .TUESDAY... * Sky/Weather...........Mostly sunny. Slight chance of rain in the afternoon. * Chance Lightning.......0 percent. * Max Temperature.......59-66...51-57 higher elevations. 24 hr trend......11 degrees up. * Min Humidity..........29-36 percent. 24 hr trend......7 percent down...13 percent down higher elevations. * Wind (20 FT). Lower Elevations...Southwest winds 10 to 15 mph. Ridges.............Southwest winds 10 to 15 mph. * Mixing Height.........500-2000 ft agl increasing to 8000-9500 ft agl. * Transport Winds.......Southwest 15 to 20 mph. * CWR...................0 percent. .FORECAST DAYS 3 THROUGH 7...... .WEDNESDAY...Mostly cloudy. Chance of showers and slight chance of thunderstorms. Lows in the lower 40s. Highs in the lower 60s. West winds 20 to 25 mph. .THURSDAY...Mostly cloudy. Chance of rain. Lows in the upper 30s. Highs in the lower 60s. Northwest winds 20 to 25 mph. .FRIDAY...Partly cloudy. Slight chance of showers and thunderstorms. Lows in the lower 40s. Highs in the upper 60s. Southwest winds 10 to 15 mph. .SATURDAY...Partly cloudy. Lows in the lower 40s. Highs in the mid 70s. .SUNDAY...Partly cloudy. Lows in the upper 40s. Highs in the upper 70s. $$ MTZ116-118-182215- Lincoln Ranger District of the Helena National Forest- Helena and Townsend Ranger Districts of the Helena National Forest- 150 AM MDT Mon May 18 2026 .TODAY... * Sky/Weather...........Partly sunny. * Chance Lightning.......0 percent. * Max Temperature.......45-53...35-45 higher elevations. 24 hr trend......3 degrees up...10 degrees up higher elevations. * Min Humidity..........32-42 percent...41-51 percent higher elevations. 24 hr trend......10 percent down...31 percent down higher elevations. * Wind (20 FT). Lower Elevations...North winds 10 to 20 mph. Ridges.............North winds 10 to 20 mph. * Mixing Height.........2000-3500 ft agl increasing to 8500 ft agl. * Transport Winds.......North around 30 mph decreasing to 20 to 25 mph in the afternoon. * CWR...................0 percent. .TONIGHT... * Sky/Weather...........Partly cloudy. * Chance Lightning.......0 percent. * Min Temperature.......23-29. 24 hr trend......3 degrees down. * Max Humidity..........74-84 percent. 24 hr trend......25 percent down. * Wind (20 FT). Lower Elevations...North winds 10 to 15 mph shifting to the south after midnight. Ridges.............West winds 10 to 15 mph. * Mixing Height.........6500-8000 ft agl decreasing to 500-1000 ft agl. * Transport Winds.......North 15 to 20 mph shifting to the southwest after midnight. * CWR...................0 percent. .TUESDAY... * Sky/Weather...........Mostly sunny. Slight chance of rain in the afternoon. * Chance Lightning.......0 percent. * Max Temperature.......55-62...44-54 higher elevations. 24 hr trend......10 degrees up. * Min Humidity..........33-43 percent. 24 hr trend......1 percent down. * Wind (20 FT). Lower Elevations...West winds 10 to 15 mph. Ridges.............West winds 10 to 15 mph. * Mixing Height.........500-1000 ft agl increasing to 8500-10000 ft agl. * Transport Winds.......West 20 to 25 mph. * CWR...................0 percent. .FORECAST DAYS 3 THROUGH 7...... .WEDNESDAY...Partly cloudy. Chance of rain. Lows in the mid 30s. Highs in the upper 50s. West winds 15 to 20 mph. .THURSDAY...Mostly cloudy. Showers likely with possible snow and thunderstorms. Lows in the mid 30s. Highs in the upper 50s. Northwest winds 15 to 20 mph. .FRIDAY...Partly cloudy. Slight chance of rain. Lows in the upper 30s. Highs in the lower 60s. Southwest winds 15 to 20 mph. .SATURDAY...Partly cloudy. Lows around 40. Highs in the upper 60s. .SUNDAY...Partly cloudy. Lows in the lower 40s. Highs in the lower 70s. $$ MTZ117-182215- Central and Eastern Lewis and Clark National Forest Areas- 150 AM MDT Mon May 18 2026 .TODAY... * Sky/Weather...........Partly sunny. Patchy fog in the morning. Slight chance of snow in the morning. * Chance Lightning.......0 percent. * Max Temperature.......43-53...33-43 higher elevations. 24 hr trend......6 degrees up. * Min Humidity..........40-50 percent. 24 hr trend......28 percent down...39 percent down higher elevations. * Wind (20 FT). Lower Elevations...North winds 15 to 20 mph. Ridges.............Windy. North winds around 25 mph decreasing to 15 to 20 mph in the afternoon. * Mixing Height.........2500-4000 ft agl increasing to 6500-7500 ft agl. * Transport Winds.......North around 30 mph decreasing to 20 to 25 mph in the afternoon. * CWR...................0 percent. .TONIGHT... * Sky/Weather...........Partly cloudy. * Chance Lightning.......0 percent. * Min Temperature.......20-30. 24 hr trend......4 degrees down. * Max Humidity..........75-85 percent. 24 hr trend......25 percent down. * Wind (20 FT). Lower Elevations...East winds 10 to 15 mph shifting to the south after midnight. Ridges.............North winds 15 to 20 mph shifting to the southwest after midnight. * Mixing Height.........6000-7000 ft agl decreasing to BELOW 1000 ft agl. * Transport Winds.......Northeast 20 to 25 mph shifting to the southwest after midnight. * CWR...................0 percent. .TUESDAY... * Sky/Weather...........Mostly sunny. Slight chance of rain in the afternoon. * Chance Lightning.......0 percent. * Max Temperature.......54-64...45-55 higher elevations. 24 hr trend......19 degrees up...13 degrees up higher elevations. * Min Humidity..........33-43 percent. 24 hr trend......6 percent down. * Wind (20 FT). Lower Elevations...West winds 15 to 20 mph. Ridges.............West winds 15 to 20 mph. * Mixing Height.........500-1000 ft agl increasing to 8000-9500 ft agl. * Transport Winds.......West 20 to 25 mph. * CWR...................0 percent. .FORECAST DAYS 3 THROUGH 7...... .WEDNESDAY...Partly cloudy. Showers likely and slight chance of thunderstorms. Lows in the mid 30s. Highs in the mid 50s. West winds 15 to 20 mph. .THURSDAY...Mostly cloudy. Showers likely with possible snow and thunderstorms. Lows in the mid 30s. Highs in the upper 50s. Northwest winds 20 to 25 mph. .FRIDAY...Partly cloudy. Chance of showers and slight chance of thunderstorms. Lows in the upper 30s. Highs in the lower 60s. Southwest winds 10 to 15 mph. .SATURDAY...Partly cloudy. Lows around 40. Highs in the upper 60s. .SUNDAY...Partly cloudy. Lows in the mid 40s. Highs in the lower 70s. $$ weather.gov/greatfalls