485
FNUS75 KGGW 100048
FWSGGW

Spot Forecast for Chamberlin Reservoir...DNR
National Weather Service Glasgow MT
648 PM MDT Wed Sep 9 2026

Forecast is based on forecast start time of 1800 MDT on September 09.
If conditions become unrepresentative...contact the National Weather
Service at (406) 228-9622.

.DISCUSSION...
Dry conditions are expected tonight through Thursday. Light S to
SW winds will slowly veer W with gusts into the afternoon after
sun-up. Expect dry conditions Thursday with a cold front arriving
in the evening around 7 to 9PM. This will be accompanied by a wind
shift from West to North, but speed and gusts themselves should
drop off to around 10 mph for the rest of the night.


.TONIGHT...

Sky/weather.........Mostly clear (10-20 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Min temperature.....Around 54.
Max humidity........51 percent.
Wind (20 ft)........West winds 5 to 9 mph with gusts to around 19
                    mph early in the evening becoming light, then
                    becoming south 5 to 7 mph with gusts to around
                    16 mph late in the evening.
Mixing height.......400 ft AGL.
Transport winds.....West 8 to 17 mph shifting to the southwest 7 to
                    15 mph in the late evening and overnight.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........3   4   10  11  21  20  10  11  11  12  22  25
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............73  71  67  64  62  61  60  59  58  57  56  55
RH..............33  37  41  44  47  49  49  50  51  51  50  51
20 FT wind dir..W   W   W   W   SW  S   S   S   S   S   S   S
20 FT wind spd..9   6   5   4   4   5   6   6   6   7   7   7
20 FT wind gust.19  14  10  7   8   10  10  12  14  14  16  14
Mix hgt (kft)...5.9 1.2 0.4 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.4
Transp wind dir.W   W   W   W   SW  S   SW  SW  SW  SW  SW  SW
Transp wind spd.17  12  9   8   7   8   10  13  15  15  15  14

.THURSDAY...

Sky/weather.........Mostly sunny (20-30 percent).
CWR.................0 percent.
Chance of thunder...0 percent.
Max temperature.....Around 83.
Min humidity........20 percent.
Wind (20 ft)........Southwest winds around 9 mph shifting to the
                    west 10 to 13 mph in the late morning and
                    afternoon.
Mixing height.......7700 ft AGL.
Transport winds.....Southwest 13 to 22 mph shifting to the west 20
                    to 24 mph in the afternoon.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........30  45  20  25  24  22  13  6   6   7   7   11
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of thdr (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............55  54  57  61  67  72  76  79  81  82  82  83
RH..............51  50  45  39  33  29  24  21  21  20  20  22
20 FT wind dir..S   SW  SW  SW  W   W   W   W   W   W   W   W
20 FT wind spd..9   9   9   9   10  11  12  12  12  12  13  12
20 FT wind gust.11  11  11  11  13  14  17  18  18  18  18  17
Mix hgt (kft)...0.5 0.4 0.4 0.7 1.7 3.0 3.9 5.3 6.5 7.2 7.7 5.1
Transp wind dir.SW  SW  SW  W   W   W   W   W   W   W   W   W
Transp wind spd.14  14  13  15  20  22  22  20  21  24  21  20

.THURSDAY NIGHT...

Sky/weather.........Partly cloudy (35-45 percent) then becoming
                    mostly cloudy (70-80 percent). Chance of rain
                    showers early in the morning.
CWR.................5 percent.
Chance of thunder...7 percent.
Min temperature.....Around 52.
Max humidity........74 percent.
Wind (20 ft)........Northwest winds 6 to 9 mph shifting to the
                    north 6 to 7 mph overnight.
Mixing height.......300 ft AGL.
Transport winds.....Northwest 10 to 18 mph shifting to the north 12
                    to 15 mph overnight.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........40  40  40  80  80  80  60  60  60  87  87  87
Weather cov.....                                            CHC
Weather type....                                            RW
Tstm cov........
CWR.............0   0   0   0   0   0   10  10  10  10  10  10
Chc of thdr (%).0   0   0   0   0   0   10  10  10  10  10  10
Temp............81  78  75  70  67  66  64  62  60  59  56  54
RH..............25  28  32  37  41  45  48  53  57  60  63  67
20 FT wind dir..NW  NW  NW  N   N   N   N   N   N   N   N   N
20 FT wind spd..9   9   9   6   6   6   7   7   7   6   6   6
20 FT wind gust.11  11  11  14  14  14  14  14  14  14  14  14
Mix hgt (kft)...3.2 1.5 0.7 0.5 0.3 0.4 0.5 0.5 0.6 0.7 0.9 1.1
Transp wind dir.W   NW  NW  NW  NW  N   N   N   N   N   N   N
Transp wind spd.18  13  10  10  10  10  12  13  14  15  15  14

$$
Forecaster...HICKS
Requested by...Eddie Hutton
Type of request...WILDFIRE
.TAG 2621548.0/GGW
.DELDT 09/09/26
.FormatterVersion 2.0.0
.EMAIL mtmcc@firenet.gov