998
FNUS75 KGGW 120422
FWSGGW

Spot Forecast for White Rock...Lewistown Interagency Dispatch
National Weather Service Glasgow MT
1022 PM MDT Tue Aug 11 2026

Forecast is based on forecast start time of 2100 MDT on August 11.
If conditions become unrepresentative...contact the National Weather
Service at (406) 228-9622.

.DISCUSSION...
From 4 am to 8 am Wednesday, there is a slight chance of thunderstorms as a
small trough moves through the area. There is a stronger trough
expected to move in on Wednesday night, so periods of rain showers
are possible. There is moderate to high (50 to 70 percent) confidence
of a wetting rain occurring.

.WEDNESDAY...

Sky/weather.........Partly cloudy (35-45 percent), then slight
                    chance showers after 3 pm.
CWR.................2 percent.
Chance of thunder...6 percent.
Max temperature.....Around 80.
Min humidity........40 percent.
Wind (20 ft)........Northeast winds 10 to 15 mph.
Mixing height.......7000 ft AGL.
Transport winds.....Northeast 16 to 19 mph.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........43  61  60  40  50  37  32  18  27  16  39  35
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   5   5   5
Chc of thdr (%).0   0   0   0   0   0   0   0   0   5   5   10
Temp............58  58  61  64  69  72  76  78  78  79  78  78
RH..............79  81  73  65  58  53  46  42  40  40  40  42
20 FT wind dir..N   N   N   NE  NE  NE  NE  NE  NE  NE  NE  NE
20 FT wind spd..10  11  12  13  13  14  14  15  15  15  15  14
20 FT wind gust.12  13  14  14  19  20  21  21  21  21  21  20
Mix hgt (kft)...0.5 0.6 1.3 1.9 2.8 4.1 5.0 5.8 6.1 6.7 7.0 6.7
Transp wind dir.N   N   NE  NE  NE  NE  NE  NE  NE  NE  NE  NE
Transp wind spd.16  17  18  18  18  17  17  17  18  17  17  16

.WEDNESDAY NIGHT...

Sky/weather.........Mostly cloudy (70-80 percent). Chance of
                    showers and thunderstorms in the evening, then
                    rain showers overnight.
CWR.................12 percent increasing to 78 percent overnight.
Chance of thunder...26 percent.
Min temperature.....Around 54.
Max humidity........92 percent.
Wind (20 ft)........Northeast winds 11 to 17 mph. Gusts up to 26 mph
                    in the evening. Gusty and erratic winds expected
                    near thunderstorms in the evening. Winds decreasing
                    to 8 to 14 mph after 9 pm.
Mixing height.......600 ft AGL.
Transport winds.....Northeast 17 to 20 mph.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........53  53  54  57  58  61  74  82  88  98  98  94
Weather cov.....CHC CHC CHC CHC CHC CHC CHC LKY LKY LKY DEF DEF
Weather type....RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........CHC CHC CHC SCH SCH SCH
CWR.............10  10  10  10  10  10  80  80  80  80  80  80
Chc of thdr (%).30  30  30  20  20  20  10  10  10  10  10  10
Temp............77  75  71  67  64  63  62  61  60  59  57  56
RH..............42  44  50  59  66  70  73  79  82  84  87  90
20 FT wind dir..N   NE  NE  NE  NE  NE  NE  NE  NE  NE  NE  NE
20 FT wind spd..15  16  17  16  14  13  13  13  11  10  10  10
20 FT wind gust.25  25  25  20  17  16  16  16  15  15  15  14
Mix hgt (kft)...5.4 4.6 2.3 1.0 1.3 0.6 0.9 0.8 1.4 1.4 1.5 1.5
Transp wind dir.NE  NE  NE  NE  NE  NE  E   E   NE  E   NE  E
Transp wind spd.20  19  19  17  17  17  17  17  17  17  17  17

.THURSDAY...

Sky/weather.........Cloudy (95-100 percent). Rain showers and
                    slight chance of thunderstorms in the morning,
                    then rain showers likely and chance of
                    thunderstorms in the afternoon.
CWR.................55 percent.
Chance of thunder...27 percent.
Max temperature.....Around 68.
Min humidity........73 percent.
Wind (20 ft)........East winds 10 to 16 mph. Gusts up to 25 mph in
                    the late morning and afternoon. Gusty and
                    erratic winds expected near thunderstorms.
Mixing height.......3200 ft AGL.
Transport winds.....East 15 to 18 mph.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........100 100 100 97  97  97  98  98  98  95  95  95
Weather cov.....CHC CHC DEF CHC CHC CHC LKY CHC LKY SCH CHC CHC
Weather type....RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW  RW
Tstm cov........            SCH SCH SCH SCH SCH SCH SCH CHC CHC
CWR.............50  50  50  50  50  50  60  60  60  60  60  60
Chc of thdr (%).10  10  10  20  20  20  20  20  20  20  30  30
Temp............56  55  56  58  60  61  63  64  65  66  66  66
RH..............92  99  96  92  91  88  83  77  74  73  73  74
20 FT wind dir..NE  NE  NE  NE  NE  NE  E   E   E   E   E   E
20 FT wind spd..10  10  11  12  13  14  15  15  15  15  15  15
20 FT wind gust.13  14  15  17  21  25  24  25  25  25  24  23
Mix hgt (kft)...1.4 1.5 1.6 2.0 2.3 2.5 2.7 3.0 2.8 3.2 2.9 2.8
Transp wind dir.NE  NE  E   E   E   E   E   E   E   E   E   NE
Transp wind spd.15  15  15  16  17  18  17  17  16  15  15  15

$$
Forecaster...STOINSKI
Requested by...Cailyn Turner
Type of request...WILDFIRE
.TAG 2619490.0/GGW
.DELDT 08/11/26
.FormatterVersion 2.0.0
.EMAIL mtlec@firenet.gov