Routine Fire Wx Fcst (With/Without 6-10 Day Outlook)
Issued by NWS Great Falls, MT
Issued by NWS Great Falls, MT
421
FNUS55 KTFX 171936
FWFTFX
Fire Weather Planning Forecast for North-Central Montana
National Weather Service Great Falls MT
136 PM MDT Sun Aug 17 2025
.DISCUSSION...
Scattered showers and thunderstorms continue through the evening.
The main hazards will be gusty, erratic winds, lightning, and
isolated areas of heavy rainfall. Showers and thunderstorms Monday
look to remain isolated and drier, with gusty winds possible.
Tuesday and Wednesday are expected to get hot. A ridge breakdown
is currently forecasted for Wednesday and Thursday, which can
bring breezy winds. However the timing of this remains uncertain.
MTZ112-181045-
Eastern Glacier/Toole/Central/Eastern Pondera/Liberty-
136 PM MDT Sun Aug 17 2025
.TONIGHT...
* Sky/Weather...........Partly cloudy.
* Chance Lightning.......0 percent.
* Min Temperature.......50-56.
24 hr trend......Unchanged.
* Max Humidity..........66-76 percent.
24 hr trend......10 percent down.
* Wind (20 FT).
Lower Elevations...West winds 10 to 15 mph.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........7000-8500 ft agl decreasing to 500-1000 ft
agl early in the evening.
* Transport Winds.......West 15 to 20 mph.
* CWR...................0 percent.
.MONDAY...
* Sky/Weather...........Mostly sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......80-88...72-79 higher elevations.
24 hr trend......4 degrees up.
* Min Humidity..........25-30 percent.
24 hr trend......3 percent up.
* Wind (20 FT).
Lower Elevations...Southwest winds 10 to 15 mph.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........500-1000 ft agl increasing to 9000-10000 ft
agl.
* Transport Winds.......Southwest 15 to 20 mph increasing to around
25 mph in the afternoon.
* CWR...................0 percent.
.MONDAY NIGHT...
* Sky/Weather...........Mostly clear.
* Chance Lightning.......0 percent.
* Min Temperature.......54-61.
24 hr trend......5 degrees up.
* Max Humidity..........60-70 percent.
24 hr trend......2 percent down.
* Wind (20 FT).
Lower Elevations...West winds 10 to 15 mph.
Ridges.............West winds 10 to 15 mph.
* Mixing Height.........8000 ft agl decreasing to 500-1000 ft agl.
* Transport Winds.......West 15 to 20 mph.
* CWR...................0 percent.
.TUESDAY...
* Sky/Weather...........Sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......86-94...77-84 higher elevations.
24 hr trend......6 degrees up.
* Min Humidity..........20-25 percent.
24 hr trend......5 percent down.
* Wind (20 FT).
Lower Elevations...West winds 10 to 15 mph shifting to the
south in the afternoon.
Ridges.............West winds 10 to 15 mph shifting to the
south in the afternoon.
* Mixing Height.........500-1500 ft agl increasing to 12500 ft agl.
* Transport Winds.......West 15 to 20 mph increasing to southwest
around 25 mph in the afternoon.
* CWR...................0 percent.
.FORECAST DAYS 3 THROUGH 7......
.WEDNESDAY...Partly cloudy. Lows around 60. Highs in the upper
80s. West winds 15 to 20 mph.
.THURSDAY...Not as warm. Mostly clear. Lows in the lower 50s.
Highs in the mid 70s. Northwest winds 15 to 20 mph.
.FRIDAY...Mostly clear. Lows around 50. Highs in the lower 70s.
Northeast winds 10 to 15 mph.
.SATURDAY...Mostly clear. Lows in the upper 40s. Highs in the
upper 70s.
.SUNDAY...Mostly clear. Lows in the lower 50s. Highs in the upper
70s.
$$
MTZ113-181045-
Hill and Blaine Counties-
136 PM MDT Sun Aug 17 2025
.TONIGHT...
* Sky/Weather...........Mostly cloudy then becoming partly cloudy.
Chance of showers in the evening.
* Chance Lightning.......0 percent.
* Min Temperature.......56-61.
24 hr trend......Unchanged.
* Max Humidity..........78-88 percent.
24 hr trend......15 percent down...9 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...Southwest winds 5 to 10 mph.
Ridges.............Southwest winds 5 to 10 mph.
* Mixing Height.........7000-8500 ft agl decreasing to 500-1000 ft
agl early in the evening.
* Transport Winds.......Southwest 15 to 20 mph.
* CWR...................0 percent.
.MONDAY...
* Sky/Weather...........Mostly sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......84-89...77-82 higher elevations.
24 hr trend......4 degrees up.
* Min Humidity..........26-35 percent.
24 hr trend......3 percent up.
* Wind (20 FT).
Lower Elevations...South winds 5 to 10 mph.
Ridges.............South winds 5 to 10 mph.
* Mixing Height.........500-2000 ft agl increasing to 8000-9000 ft
agl.
* Transport Winds.......South 10 to 15 mph increasing to southwest
20 to 25 mph in the afternoon.
* CWR...................0 percent.
.MONDAY NIGHT...
* Sky/Weather...........Partly cloudy.
* Chance Lightning.......0 percent.
* Min Temperature.......58-64.
24 hr trend......4 degrees up.
* Max Humidity..........65-75 percent...59-65 percent higher
elevations.
24 hr trend......9 percent down...16 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...Southeast winds 5 to 10 mph.
Ridges.............Southeast winds 5 to 10 mph.
* Mixing Height.........8500 ft agl decreasing to 500-1000 ft agl.
* Transport Winds.......South 15 to 20 mph.
* CWR...................0 percent.
.TUESDAY...
* Sky/Weather...........Sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......90-95...83-88 higher elevations.
24 hr trend......8 degrees up.
* Min Humidity..........22-30 percent.
24 hr trend......10 percent down.
* Wind (20 FT).
Lower Elevations...Southeast winds around 5 mph.
Ridges.............Southeast winds around 5 mph shifting to
the south in the afternoon.
* Mixing Height.........500-1500 ft agl increasing to 7500-9000 ft
agl.
* Transport Winds.......South 15 to 20 mph.
* CWR...................0 percent.
.FORECAST DAYS 3 THROUGH 7......
.WEDNESDAY...Partly cloudy. Lows in the lower 60s. Highs in the
lower 90s. North winds 10 to 15 mph.
.THURSDAY...Not as warm. Partly cloudy. Slight chance of showers
and thunderstorms. Lows in the upper 50s. Highs in the upper 70s.
Northwest winds 15 to 20 mph.
.FRIDAY...Mostly clear. Lows in the lower 50s. Highs in the mid
70s. North winds 10 to 15 mph.
.SATURDAY...Mostly clear. Lows in the upper 40s. Highs in the mid
70s.
.SUNDAY...Mostly clear. Lows in the lower 50s. Highs in the upper
70s.
$$
MTZ114-181045-
Lewis and Clark National Forest Rocky Mountain District-
Rocky Mountain Front-
136 PM MDT Sun Aug 17 2025
.TONIGHT...
* Sky/Weather...........Partly cloudy. Slight chance of showers in
the evening.
* Chance Lightning.......0 percent.
* Min Temperature.......48-55.
24 hr trend......3 degrees down...3 degrees up higher
elevations.
* Max Humidity..........68-78 percent.
24 hr trend......2 percent up...10 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...Southwest winds 5 to 10 mph.
Ridges.............Southwest winds 5 to 10 mph.
* Mixing Height.........5000-6500 ft agl decreasing to 1000-1500 ft
agl early in the evening.
* Transport Winds.......Southwest 15 to 20 mph.
* CWR...................0 percent.
.MONDAY...
* Sky/Weather...........Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon.
* Chance Lightning.......20 percent.
* Max Temperature.......81-88...68-78 higher elevations.
24 hr trend......6 degrees up.
* Min Humidity..........24-30 percent...30-40 percent higher
elevations.
24 hr trend......3 percent down...4 percent up higher
elevations.
* Wind (20 FT).
Lower Elevations...Southwest winds 10 to 15 mph.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........1000-1500 ft agl increasing to 10000-11000
ft agl.
* Transport Winds.......Southwest 20 to 25 mph increasing to around
30 mph in the afternoon.
* CWR...................0 percent.
.MONDAY NIGHT...
* Sky/Weather...........Mostly clear.
* Chance Lightning.......0 percent.
* Min Temperature.......53-59.
24 hr trend......5 degrees up.
* Max Humidity..........58-68 percent.
24 hr trend......8 percent down.
* Wind (20 FT).
Lower Elevations...West winds 5 to 15 mph.
Ridges.............West winds 5 to 15 mph.
* Mixing Height.........8000-9500 ft agl decreasing to 1000-1500 ft
agl early in the evening.
* Transport Winds.......Southwest 15 to 20 mph.
* CWR...................0 percent.
.TUESDAY...
* Sky/Weather...........Sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......86-95...74-84 higher elevations.
24 hr trend......7 degrees up.
* Min Humidity..........17-27 percent.
24 hr trend......8 percent down.
* Wind (20 FT).
Lower Elevations...West winds around 5 mph shifting to the
south in the afternoon.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........500-1500 ft agl increasing to 13500 ft agl.
* Transport Winds.......Southwest 15 to 20 mph increasing to around
25 mph in the afternoon.
* CWR...................0 percent.
.FORECAST DAYS 3 THROUGH 7......
.WEDNESDAY...Partly cloudy. Slight chance of showers and
thunderstorms. Lows in the upper 50s. Highs in the mid 80s. West
winds 15 to 20 mph.
.THURSDAY...Mostly clear. Lows in the lower 50s. Highs in the mid
70s. West winds 15 to 20 mph.
.FRIDAY...Mostly clear. Lows in the upper 40s. Highs in the lower
70s. North winds 15 to 20 mph.
.SATURDAY...Mostly clear. Lows in the upper 40s. Highs in the
upper 70s.
.SUNDAY...Mostly clear. Lows around 50. Highs in the upper 70s.
$$
MTZ115-181045-
Chouteau and Fergus Counties-
136 PM MDT Sun Aug 17 2025
.TONIGHT...
* Sky/Weather...........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of thunderstorms in the
evening.
* Chance Lightning.......20 percent.
* Min Temperature.......55-60.
24 hr trend......1 degree up.
* Max Humidity..........77-87 percent.
24 hr trend......15 percent down...7 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...Southwest winds 5 to 10 mph.
Ridges.............Southwest winds 5 to 10 mph.
* Mixing Height.........5500-6500 ft agl decreasing to 500-1000 ft
agl early in the evening.
* Transport Winds.......South 20 to 25 mph.
* CWR...................20 percent.
.MONDAY...
* Sky/Weather...........Sunny. Slight chance of showers in the
afternoon.
* Chance Lightning.......0 percent.
* Max Temperature.......84-90...76-82 higher elevations.
24 hr trend......6 degrees up.
* Min Humidity..........27-34 percent.
24 hr trend......Unchanged.
* Wind (20 FT).
Lower Elevations...South winds around 5 mph.
Ridges.............South winds around 5 mph.
* Mixing Height.........500-1500 ft agl increasing to 8000-9500 ft
agl.
* Transport Winds.......Southwest 10 to 15 mph increasing to 20 to
25 mph in the afternoon.
* CWR...................0 percent.
.MONDAY NIGHT...
* Sky/Weather...........Partly cloudy.
* Chance Lightning.......0 percent.
* Min Temperature.......58-64.
24 hr trend......3 degrees up.
* Max Humidity..........60-70 percent.
24 hr trend......17 percent down.
* Wind (20 FT).
Lower Elevations...Southeast winds 5 to 10 mph.
Ridges.............Southeast winds 5 to 10 mph.
* Mixing Height.........8500 ft agl decreasing to 500-1500 ft agl.
* Transport Winds.......Southeast 15 to 20 mph.
* CWR...................0 percent.
.TUESDAY...
* Sky/Weather...........Sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......91-97...83-89 higher elevations.
24 hr trend......6 degrees up.
* Min Humidity..........18-23 percent.
24 hr trend......8 percent down...16 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...Southwest winds around 5 mph.
Ridges.............South winds around 5 mph shifting to the
northwest in the afternoon.
* Mixing Height.........500-2000 ft agl increasing to 11000-12500
ft agl.
* Transport Winds.......Southwest 15 to 20 mph.
* CWR...................0 percent.
.FORECAST DAYS 3 THROUGH 7......
.WEDNESDAY...Mostly clear. Lows in the lower 60s. Highs in the
lower 90s. Northwest winds 10 to 15 mph.
.THURSDAY...Not as warm. Partly cloudy. Slight chance of showers
and thunderstorms. Lows in the upper 50s. Highs around 80.
Northwest winds 15 to 20 mph.
.FRIDAY...Mostly clear. Lows in the mid 50s. Highs in the mid
70s. Northeast winds 10 to 15 mph.
.SATURDAY...Mostly clear. Lows in the lower 50s. Highs in the
upper 70s.
.SUNDAY...Mostly clear. Lows in the lower 50s. Highs in the lower
80s.
$$
MTZ116-118-181045-
Lincoln Ranger District of the Helena National Forest-
Helena and Townsend Ranger Districts of the Helena National
Forest-
136 PM MDT Sun Aug 17 2025
.TONIGHT...
* Sky/Weather...........Partly cloudy. Chance of showers and
thunderstorms in the evening. Haze through the night.
* Chance Lightning.......50 percent.
* Min Temperature.......50-56.
24 hr trend......2 degrees down.
* Max Humidity..........78-88 percent.
24 hr trend......5 percent up...2 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...South winds 10 to 15 mph.
Ridges.............South winds 10 to 15 mph.
* Mixing Height.........2500-3500 ft agl decreasing to 1000-1500 ft
agl early in the evening.
* Transport Winds.......South 15 to 20 mph.
* CWR...................0 percent.
.MONDAY...
* Sky/Weather...........Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon.
* Chance Lightning.......20 percent.
* Max Temperature.......80-88...70-80 higher elevations.
24 hr trend......4 degrees up.
* Min Humidity..........24-34 percent.
24 hr trend......4 percent down...9 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...Southwest winds 10 to 15 mph.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........1000-2500 ft agl increasing to 4000 ft agl
late in the morning, then increasing to 6000 ft agl early in the
afternoon increasing to 8000-9500 ft agl early in the afternoon
increasing to 10000-10500 ft agl decreasing to 8500 ft agl late
in the afternoon.
* Transport Winds.......Southwest 25 to 30 mph.
* CWR...................0 percent.
.MONDAY NIGHT...
* Sky/Weather...........Partly cloudy.
* Chance Lightning.......0 percent.
* Min Temperature.......53-60.
24 hr trend......5 degrees up.
* Max Humidity..........56-66 percent.
24 hr trend......29 percent down...22 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...South winds 10 to 15 mph.
Ridges.............South winds 10 to 15 mph.
* Mixing Height.........7000 ft agl decreasing to 1000-1500 ft agl.
* Transport Winds.......South 20 to 25 mph decreasing to 10 to 15
mph after midnight.
* CWR...................0 percent.
.TUESDAY...
* Sky/Weather...........Sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......87-95...77-87 higher elevations.
24 hr trend......8 degrees up.
* Min Humidity..........12-19 percent.
24 hr trend......13 percent down.
* Wind (20 FT).
Lower Elevations...South winds 10 to 15 mph.
Ridges.............South winds 10 to 15 mph.
* Mixing Height.........1000-1500 ft agl increasing to 11500-13000
ft agl.
* Transport Winds.......Southwest 15 to 20 mph.
* CWR...................0 percent.
.FORECAST DAYS 3 THROUGH 7......
.WEDNESDAY...Mostly clear. Lows in the upper 50s. Highs in the
mid 80s. West winds 10 to 15 mph.
.THURSDAY...Mostly clear. Lows in the mid 50s. Highs in the upper
70s. Northwest winds 10 to 15 mph.
.FRIDAY...Mostly clear. Lows in the lower 50s. Highs in the mid
70s. North winds 15 to 20 mph.
.SATURDAY...Mostly clear. Lows in the upper 40s. Highs around 80.
.SUNDAY...Mostly clear. Lows in the lower 50s. Highs around 80.
$$
MTZ117-181045-
Central and Eastern Lewis and Clark National Forest Areas-
136 PM MDT Sun Aug 17 2025
.TONIGHT...
* Sky/Weather...........Mostly cloudy then becoming partly cloudy.
Chance of showers and slight chance of thunderstorms in the
evening. Haze after midnight.
* Chance Lightning.......20 percent.
* Min Temperature.......48-57.
24 hr trend......Unchanged.
* Max Humidity..........76-86 percent.
24 hr trend......Unchanged.
* Wind (20 FT).
Lower Elevations...South winds 10 to 15 mph.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........5000 ft agl decreasing to 1000-2500 ft agl.
* Transport Winds.......Southwest 15 to 20 mph.
* CWR...................10 percent.
.MONDAY...
* Sky/Weather...........Mostly sunny. Slight chance of showers and
thunderstorms in the afternoon.
* Chance Lightning.......20 percent.
* Max Temperature.......81-90...71-81 higher elevations.
24 hr trend......3 degrees up.
* Min Humidity..........23-33 percent.
24 hr trend......2 percent down...7 percent down higher
elevations.
* Wind (20 FT).
Lower Elevations...Southwest winds 10 to 15 mph.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........1000-1500 ft agl increasing to 9500-11000
ft agl.
* Transport Winds.......Southwest 15 to 20 mph increasing to around
25 mph in the afternoon.
* CWR...................0 percent.
.MONDAY NIGHT...
* Sky/Weather...........Partly cloudy. Slight chance of showers in
the evening.
* Chance Lightning.......0 percent.
* Min Temperature.......53-61.
24 hr trend......2 degrees up.
* Max Humidity..........54-64 percent.
24 hr trend......25 percent down.
* Wind (20 FT).
Lower Elevations...South winds 5 to 10 mph.
Ridges.............South winds 5 to 10 mph.
* Mixing Height.........10000 ft agl decreasing to 1000-1500 ft
agl.
* Transport Winds.......South 15 to 20 mph.
* CWR...................0 percent.
.TUESDAY...
* Sky/Weather...........Sunny.
* Chance Lightning.......0 percent.
* Max Temperature.......88-96...78-88 higher elevations.
24 hr trend......7 degrees up.
* Min Humidity..........13-20 percent.
24 hr trend......11 percent down.
* Wind (20 FT).
Lower Elevations...Southwest winds 10 to 15 mph.
Ridges.............Southwest winds 10 to 15 mph.
* Mixing Height.........500-1500 ft agl increasing to 11500-13000
ft agl.
* Transport Winds.......Southwest 15 to 20 mph.
* CWR...................0 percent.
.FORECAST DAYS 3 THROUGH 7......
.WEDNESDAY...Mostly clear. Lows in the upper 50s. Highs in the
upper 80s. Southwest winds 15 to 20 mph.
.THURSDAY...Not as warm. Partly cloudy. Slight chance of showers
and thunderstorms. Lows in the mid 50s. Highs in the upper 70s.
Northwest winds 15 to 20 mph.
.FRIDAY...Mostly clear. Lows around 50. Highs in the lower 70s.
Northeast winds 10 to 15 mph.
.SATURDAY...Mostly clear. Lows in the upper 40s. Highs in the
upper 70s.
.SUNDAY...Mostly clear. Lows around 50. Highs in the upper 70s.
$$
weather.gov/greatfalls