430
FNUS75 KBYZ 180959
FWSBYZ

Spot Forecast for Lonesomewoood RX...USFS
National Weather Service Billings MT
359 AM MDT Fri Sep 18 2026

Forecast is based on ignition time of 0600 MDT on September 18.
If conditions become unrepresentative...contact the National Weather
Service.

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

.DISCUSSION...
A slow-moving weather system will bring occasional showers, some
embedded thunderstorms and very high humidity today through
Saturday. Expect moderate to heavy rain at times. Additional
rainfall will be over a half inch, and there is a 50% chance of
seeing at least an inch of rain over the next 48 hours. Visibility
will be reduced frequently. Showers will become less common
Sunday. Warmer and drier weather is expected Monday & Tuesday.
There is uncertainty when shower chances return next week, but it
could be by Wednesday. Will need to monitor this.

.TODAY...

Sky/weather.........Mostly cloudy with occasional showers. Scattered
                    thunderstorms in the afternoon. Heavy rain
                    possible. Erratic winds near thunderstorms.
CWR.................80 percent.
Chance of lightning.30 percent.
Max temperature.....59-63.
Min humidity........71-75 percent.
Wind (20 ft)........
 Slope/valley.......Light and variable early, becoming east 4-8 mph.
 Ridgetop...........Southeast to south around 10 mph.
Mixing height.......Increasing to 3500 ft AGL in the afternoon.
Transport winds.....Southeast to south 10 mph.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........70  68  64  59  68  84  94  90  87  80  82  92
Weather cov.....SCT SCT SCT SCT SCT DEF DEF DEF DEF DEF DEF DEF
Weather type....RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........ISO                     ISO ISO ISO SCT SCT SCT
Chc of ltng (%).15  10  10  10  10  10  15  20  25  30  30  30
Temp............45  45  45  47  50  54  58  60  61  61  60  59
RH..............100 100 100 98  90  83  79  73  73  74  77  79
20 FT wind dir..W   W   NW  NW  NE  NE  E   E   E   E   E   SE
20 FT wind spd..1   2   2   2   3   4   5   5   6   5   5   4
20 FT wind gust.2   3   4   5   5   6   7   9   10  10  10  8

.TONIGHT...

Sky/weather.........Mostly cloudy with occasional showers. Isolated
                    evening thunderstorms. Heavy rain possible.
                    Erratic winds near thunderstorms.
CWR.................65 percent.
Chance of lightning.25 percent.
Min temperature.....41-45.
Max humidity........Near 100 percent.
Wind (20 ft)........
 Slope/valley.......Light downslope/downvalley 3-6 mph.
 Ridgetop...........Southeast to south 5-10 mph.
Mixing height.......Decreasing to 500 ft AGL overnight.
Transport winds.....West 5 mph.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........92  90  98  97  79  94  75  68  72  77  77  77
Weather cov.....DEF DEF LKY LKY LKY LKY CHC CHC CHC LKY LKY LKY
Weather type....RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........ISO ISO ISO ISO
Chc of ltng (%).20  20  15  15  10  10  10  10  10  5   5   5
Temp............56  53  51  50  49  49  49  47  47  46  45  44
RH..............85  91  93  94  95  95  96  97  99  98  100 100
20 FT wind dir..SE  S   SW  W   W   NW  NW  NW  W   W   W   W
20 FT wind spd..4   3   3   2   2   2   2   2   3   3   4   3
20 FT wind gust.7   6   6   5   5   4   4   4   4   5   5   5

.SATURDAY...

Sky/weather.........Mostly cloudy. Scattered showers in the morning,
                    then numerous showers and isolated thunderstorms
                    in the afternoon. Heavy rain possible. Erratic
                    winds near thunderstorms.
CWR.................60 percent.
Chance of lightning.20 percent.
Max temperature.....54-58.
Min humidity........70-74 percent.
Wind (20 ft)........
 Slope/valley.......Downslope/downvalley 3-7 mph in the morning
                    becoming east 5-10 mph.
 Ridgetop...........Southwest to west 5-10 mph.
Mixing height.......Increasing to 3500 ft AGL in the afternoon.
Transport winds.....West 10 mph.

TIME (MDT)      6 AM      9 AM      NOON      3 PM
Sky (%).........86        78        69        82
Weather cov.....CHANCE    CHANCE    LIKELY    LIKELY
Weather type....RNSHWR    RNSHWR    RNSHWR    RNSHWR
Tstm cov........                    S CHC     S CHC
Chc of ltng (%).5         10        15        20
Temp............43        44        51        56
RH..............100       95        85        72
20 FT wind......W 3G6     W 3G5     NE 4G8    E 6G10

.FORECAST DAYS 3 THROUGH 7...
.SUNDAY...
Mostly cloudy. Chance of showers and slight chance of
thunderstorms. Lows in the upper 30s. Highs in the lower 60s.
Light terrain-driven winds.
.MONDAY...
Partly cloudy. Lows in the upper 30s. Highs in the mid 60s. Light
terrain-driven winds.
.TUESDAY...
Partly cloudy. Lows around 40. Highs in the upper 60s. Light
terrain-driven winds.
.WEDNESDAY AND THURSDAY...
Partly cloudy with a slight chance of showers. Lows in the upper
30s. Highs in the upper 60s.

$$
Forecaster...Lester
Requested by...Chris Enriquez
Type of request...PRESCRIBED
.TAG 2621360.9/BYZ
.DELDT 09/18/26
.FormatterVersion 2.0.0
.EMAIL christian.enriquez@usda.gov,nicholas.nelson@usda.gov,tyler.kuhn@usda.gov