Spot Forecast
Issued by NWS Missoula, MT

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065
FNUS75 KMSO 290742
FWSMSO

Spot Forecast for Lower Blackfoot Corridor F4
National Weather Service Missoula MT
142 AM MDT Tue Sep 29 2026

Forecast is based on ignition time of 0600 MDT on September 29.
If conditions become unrepresentative...contact the National Weather
Service.

.DISCUSSION...Mild and dry conditions continue. Today looks
similar to Monday for daytime temperatures, touch higher for min
Rh but winds will be noticeably stronger. Wednesday looks a bit
cooler with higher min Rh and lighter winds yet still breezy.
Mixing heights of 4500-5000 ft agl are expected with 10-20 mph
transport winds each afternoon.

There is a slight chance of showers on Wednesday but the chance of
wetting rain is in the single digits.

.TODAY...

* Sky/Weather.........Partly cloudy.
* CWR (> 0.10 Inch)...0 percent.
* Chance Lightning....0 percent.
* Max Temperature.....69-74.
* Min Humidity........29-34 percent.
* Wind (20 ft)........Variable 3-7 mph becoming southwest 5-12 mph
  in the late morning and afternoon. Gusts to 25 mph in the
  afternoon.
* Mixing Height.......500 ft agl increasing to 5000 ft agl in the
  afternoon.
* Mixing Winds........West 10 mph increasing to 20 mph in the
  afternoon.
* Precip Amount.......0.00 inches.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........29  45  52  23  27  20  29  33  26  31  25  27
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............37  36  37  40  47  52  59  64  66  68  69  67
RH..............87  84  85  81  68  55  49  39  36  32  32  34
20 FT wind dir..S   S   S   SW  SW  SW  SW  SW  SW  W   W   W
20 FT wind spd..1   2   2   5   5   5   9   9   9   12  12  12
20 FT wind gust.5   5   5   10  10  15  20  20  20  25  25  25
Mix hgt (kft)...0.5 0.5 0.5 0.5 1.5 2.5 3.0 4.0 4.5 4.5 5.0 4.5
Transp wind dir.W   W   SW  W   W   W   W   W   W   W   W   W
Transp wind spd.10  10  10  10  10  15  20  20  20  20  20  20

.TONIGHT...

* Sky/Weather.........Partly to mostly cloudy.
* CWR (> 0.10 Inch)...0 percent.
* Chance Lightning....0 percent.
* Min Temperature.....41-46.
* Max Humidity........95-100 percent.
* Wind (20 ft)........West 5-10 mph with gusts to around 25 mph in
  the evening and overnight becoming variable 3-6 mph.
* Mixing Height.......2000 ft agl decreasing to 500 ft agl early in
  the evening.
* Mixing Winds........West 20 mph decreasing to 15 mph early in the
  evening.
* Precip Amount.......0.00 inches.

TIME (MDT)      6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
Sky (%).........27  26  30  34  24  28  25  28  22  20  35  40
Weather cov.....
Weather type....
Tstm cov........
CWR.............0   0   0   0   0   0   0   0   0   0   0   0
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............66  64  59  57  55  54  52  51  50  48  48  46
RH..............36  40  45  62  63  70  75  77  79  85  88  90
20 FT wind dir..W   W   W   W   W   W   SW  SW  SW  SW  SW  SW
20 FT wind spd..10  10  10  6   6   6   5   5   3   3   3   3
20 FT wind gust.25  25  25  15  10  10  10  10  10  10  10  10
Mix hgt (kft)...4.0 2.0 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.20  15  10  10  10  10  10  10  10  10  10  10

.WEDNESDAY...

* Sky/Weather.........Partly cloudy. Slight chance of rain showers
  early in the morning.
* CWR (> 0.10 Inch)...Less than 10 percent.
* Chance Lightning....0 percent.
* Max Temperature.....66-71.
* Min Humidity........41-46 percent.
* Wind (20 ft)........Variable 3-6 mph becoming west 6-7 mph in the
  late morning and afternoon. Gusts to 15 mph.
* Mixing Height.......500 ft agl increasing to 5000 ft agl in the
  afternoon.
* Mixing Winds........West 10-15 mph.
* Precip Amount.......0.00 inches.

TIME (MDT)      6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
Sky (%).........64  64  64  56  56  56  41  41  41  33  33  33
Weather cov.....SCH SCH
Weather type....RW  RW
Tstm cov........
CWR.............4   3   0   0   0   0   0   0   0   0   0   0
Chc of ltng (%).0   0   0   0   0   0   0   0   0   0   0   0
Temp............45  45  43  45  50  53  57  62  63  65  67  64
RH..............93  95  100 100 94  85  70  61  54  49  44  43
20 FT wind dir..SW  SW  SW  SW  SW  SW  W   W   W   W   W   W
20 FT wind spd..3   3   3   6   6   6   7   7   7   6   6   6
20 FT wind gust.12  12  12  15  15  15  15  15  15  15  15  15
Mix hgt (kft)...0.5 0.5 0.5 1.5 2.5 3.0 4.0 4.0 4.5 5.0 5.0 5.0
Transp wind dir.W   W   W   W   W   W   W   W   W   W   W   W
Transp wind spd.10  10  10  10  10  15  15  15  15  15  15  15

$$
Forecaster...Booth
Requested by...Max Harrison
Type of request...PRESCRIBED
.TAG 2622582.2/MSO
.DELDT 09/29/26
.FormatterVersion 2.0.0
.EMAIL daniel.sullivan@usda.gov,stryker.clark@usda.gov,max.harrison@usda.gov