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Rule Fog Hunter

Valemount - Fog Hunter - Canadian Rockies

Valemount, British Columbia, Canada

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread5.3°C
Visibility24134 (Clear)
Relative Humidity68%
Wind Speed1.7m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Vancouver
fog weather icon
Next opportunity
Moderate Fog
Valemount
Sat, Apr 11 · 20:00–21:00 · 1h window
Low confidence
36%
🌫️Fog Probability62.7%
Dewpoint Spread: 0.2°C
Visibility: 123 (Dense fog)
Relative Humidity: 98%
Wind Speed: 1.4m/s (calm conditions)

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks the temperature inversions and fog conditions that create some of the most dramatic mountain photography in North America. We combine atmospheric data with local topography to predict when Bow Valley inversions will trap fog below while peaks glow above.

The Canadian Rockies are famous for their autumn morning fog, particularly in the Bow Valley corridor between Banff and Lake Louise. Cold mountain air settles into valleys overnight, creating thick fog layers that can persist until mid-morning, especially in September and October.

What makes Rockies fog photography exceptional:

  • Bow Valley inversions - Temperature inversions create sea-of-fog conditions with peaks emerging above the cloud layer
  • Glacier lake mist - Moraine Lake and Lake Louise develop ethereal mist at dawn when water temperatures meet cold air
  • Castle Junction phenomena - Junction areas where valleys meet create reliable fog formation zones
  • Autumn intensity - September through October brings the most dramatic and frequent fog events

Best shooting occurs at elevated viewpoints like Tunnel Mountain or Sulphur Mountain during inversions, or directly at lake level during misty conditions. Our forecast identifies when these different fog types will occur.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 95 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Vancouver
Fog Probability
≥ 60.0%
Tue, Apr 7
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Apr 8
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:0043%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:0043%
23:0043%
Thu, Apr 9
24:0043%
01:0043%
02:0043%
03:0043%
04:0043%
05:0043%
06:0049%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Fri, Apr 10
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sat, Apr 11
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).

What does Fog Probability mean?

Inputs that drive the score

This derived score summarizes multiple raw weather signals. The table below shows the supporting inputs hour by hour, so you can see what's pushing the score up or down.

Time
America/Vancouver
Clear Sky Probability (Ensemble)
%
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Solar Elevation
°
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Wed, Apr 8 Sunrise 06:12 Sunset 19:44
18:00 ☾
7% -3.8°C 0mm 68% 0cm 15° 1.5°C 0.06mm 0.22kPa 24134m 1.8m/s 1.7m/s
19:00 ☾
14% -2.7°C 0mm 84% 0cm 5.9° -0.3°C 0.06mm 0.1kPa 24135m 1.1m/s 1.2m/s
20:00 ☾
21% -4.1°C 0mm 92% 0cm -3° -3°C 0.06mm 0.04kPa 24135m 0.82m/s 0.76m/s
21:00 ☾
31% -4.7°C 0mm 93% 0cm -11° -3.7°C 0.06mm 0.03kPa 24135m 0.71m/s 0.58m/s
22:00 ☾
40% -4.8°C 0mm 93% 0cm -19° -3.9°C 0.06mm 0.03kPa 24134m 0.6m/s 0.38m/s
23:00 ☾
50% -5.1°C 0mm 93% 0cm -25° -4.2°C 0.06mm 0.03kPa 24134m 0.5m/s 0.29m/s
Thu, Apr 9 Sunrise 06:12 Sunset 19:44
24:00 ☾
63% -5.2°C 0mm 93% 0cm -28° -4.3°C 0mm 0.03kPa 24134m 0.4m/s 0.19m/s
01:00 ☾
76% -5.4°C 0mm 93% 0cm -30° -4.5°C 0mm 0.03kPa 24135m 0.4m/s 0.19m/s
02:00 ☾
89% -5.5°C 0mm 93% 0cm -28° -4.6°C 0mm 0.03kPa 24134m 0.4m/s 0.29m/s
03:00 ☾
87% -5.6°C 0mm 93% 0cm -24° -4.7°C 0mm 0.03kPa 24135m 0.4m/s 0.22m/s
04:00 ☾
84% -5.7°C 0mm 93% 0cm -18° -4.8°C 0mm 0.03kPa 24135m 0.3m/s 0.2m/s
05:00 ☾
82% -5.8°C 0mm 93% 0cm -11° -4.8°C 0mm 0.03kPa 24135m 0.3m/s 0.22m/s
06:00 ☾
78% -6°C 0mm 93% 0cm -2.4° -5°C 0mm 0.03kPa 23812m 0.33m/s 0.31m/s
07:00 ☾
75% -5.9°C 0mm 88% 0cm 6.5° -4.3°C 0mm 0.05kPa 24090m 0.41m/s 0.32m/s
08:00 ☾
71% -5.4°C 0mm 80% 0cm 15° -2.5°C 0mm 0.1kPa 24135m 0.2m/s 0.35m/s
09:00 ☾
73% -4.7°C 0mm 75% 0cm 24° -0.79°C 0mm 0.15kPa 24134m 0.41m/s 0.25m/s
10:00 ☾
76% -4°C 0mm 69% 0cm 32° 0.97°C 0mm 0.2kPa 24134m 1.1m/s 0.55m/s
11:00 ☾
78% -3.7°C 0mm 63% 0cm 39° 2.6°C 0mm 0.27kPa 24135m 1.6m/s 1m/s
12:00 ☾
77% -4°C 0mm 56% 0cm 43° 4.1°C 0mm 0.36kPa 24135m 1.8m/s 1.1m/s
13:00 ☾
76% -4.7°C 0mm 50% 0cm 45° 5°C 0mm 0.44kPa 24134m 2.2m/s 1.4m/s
14:00 ☾
75% -4.9°C 0mm 46% 0cm 43° 5.7°C 0mm 0.49kPa 24134m 2.1m/s 1.3m/s
15:00 ☾
73% -5.1°C 0mm 45% 0cm 39° 6°C 0mm 0.51kPa 24135m 2.2m/s 1.4m/s
16:00 ☾
71% -5.1°C 0mm 45% 0cm 32° 6°C 0mm 0.51kPa 24134m 2.1m/s 1.3m/s
17:00 ☾
69% -4.9°C 0mm 46% 0cm 24° 5.7°C 0mm 0.49kPa 24135m 2.1m/s 1.3m/s
18:00 ☾
63% -2°C 0mm 61% 0cm 15° 5°C 0mm 0.34kPa 24134m 1.3m/s 1m/s
19:00 ☾
56% -2.5°C 0mm 73% 0cm 6.2° 1.8°C 0mm 0.19kPa 24134m 0.9m/s 0.95m/s
20:00 ☾
50% -3.6°C 0mm 80% 0cm -2.7° -0.48°C 0mm 0.12kPa 24135m 1m/s 0.95m/s
21:00 ☾
54% -3.9°C 0mm 82% 0cm -11° -1.2°C 0mm 0.1kPa 24134m 1.1m/s 1m/s
22:00 ☾
57% -4.3°C 0mm 83% 0cm -18° -1.7°C 0mm 0.09kPa 24134m 1.1m/s 0.97m/s
23:00 ☾
61% -4.3°C 0mm 84% 0cm -24° -2°C 0mm 0.08kPa 24135m 1m/s 0.89m/s
Fri, Apr 10 Sunrise 06:09 Sunset 19:46
24:00 ☾
60% -4.4°C 0mm 85% 0cm -28° -2.3°C 0mm 0.08kPa 24134m 1m/s 0.91m/s
01:00 ☾
59% -4.4°C 0mm 86% 0cm -29° -2.4°C 0mm 0.07kPa 24134m 1.1m/s 1.1m/s
02:00 ☾
58% -4.4°C 0mm 87% 0cm -28° -2.5°C 0mm 0.07kPa 24135m 0.91m/s 0.92m/s
03:00 ☾
55% -4.5°C 0mm 88% 0cm -24° -2.8°C 0mm 0.06kPa 24135m 0.8m/s 0.7m/s
04:00 ☾
51% -4.6°C 0mm 88% 0cm -18° -2.9°C 0mm 0.06kPa 24134m 0.9m/s 0.87m/s
05:00 ☾
48% -4.7°C 0mm 87% 0cm -11° -2.9°C 0mm 0.06kPa 24134m 0.9m/s 0.91m/s
06:00 ☾
51% -4.8°C 0mm 87% 0cm -2.1° -2.9°C 0mm 0.06kPa 24134m 0.92m/s 0.86m/s
07:00 ☾
53% -4.5°C 0mm 82% 0cm 6.8° -1.9°C 0mm 0.09kPa 24134m 0.8m/s 0.71m/s
08:00 ☾
56% -4.3°C 0mm 72% 0cm 16° 0.11°C 0mm 0.17kPa 24134m 1.7m/s 1m/s
09:00 ☾
54% -4.1°C 0mm 63% 0cm 25° 2.2°C 0mm 0.27kPa 24134m 2m/s 1.3m/s
10:00 ☾
52% -3.9°C 0mm 55% 0cm 33° 4.4°C 0mm 0.38kPa 24135m 1.9m/s 1.3m/s
11:00 ☾
50% -3.9°C 0mm 49% 0cm 39° 6.1°C 0mm 0.48kPa 24135m 2.1m/s 1.4m/s
12:00 ☾
54% -3.7°C 0mm 45% 0cm 44° 7.6°C 0mm 0.58kPa 24135m 2.1m/s 1.4m/s
13:00 ☾
58% -3.2°C 0mm 42% 0cm 45° 8.8°C 0mm 0.65kPa 24134m 2.1m/s 1.3m/s
14:00 ☾
62% -2.9°C 0mm 42% 0cm 44° 9.4°C 0mm 0.69kPa 24135m 2m/s 1.2m/s
15:00 ☾
60% -2.6°C 0mm 42% 0cm 39° 9.6°C 0mm 0.69kPa 24134m 1.7m/s 0.99m/s
16:00 ☾
57% -2.3°C 0mm 44% 0cm 32° 9.5°C 0mm 0.67kPa 24135m 1.7m/s 1.1m/s
17:00 ☾
55% -0.9°C 0mm 49% 0cm 24° 9.3°C 0mm 0.6kPa 24134m 1.6m/s 1.1m/s
18:00 ☾
51% 1.4°C 0mm 64% 0cm 15° 7.9°C 0mm 0.39kPa 24134m 1.1m/s 1.1m/s
19:00 ☾
48% -0.1°C 0mm 72% 0cm 6.4° 4.6°C 0mm 0.24kPa 24134m 1m/s 1.1m/s
20:00 ☾
44% -1.2°C 0mm 78% 0cm -2.4° 2.2°C 0mm 0.16kPa 24135m 0.9m/s 0.89m/s
21:00 ☾
40% -1.7°C 0mm 81% 0cm -11° 1.3°C 0mm 0.13kPa 24135m 0.9m/s 0.76m/s
22:00 ☾
35% -2.1°C 0mm 83% 0cm -18° 0.48°C 0mm 0.11kPa 24135m 0.52m/s 0.28m/s
23:00 ☾
31% -2.3°C 0mm 84% 0cm -24° 0.1°C 0mm 0.1kPa 24135m 0.4m/s 0.11m/s
Sat, Apr 11 Sunrise 06:07 Sunset 19:47
24:00 ☾
28% -2.3°C 0mm 81% 0cm -28° 0.56°C 0mm 0.12kPa 24135m 0.51m/s 0.25m/s
01:00 ☾
25% -2.3°C 0mm 78% 0cm -29° 1°C 0mm 0.14kPa 24135m 0.62m/s 0.39m/s
02:00 ☾
22% -2.4°C 0mm 76% 0cm -27° 1.5°C 0mm 0.17kPa 24135m 0.73m/s 0.54m/s
03:00 ☾
20% -1.9°C 0mm 71% 0cm -23° 2.9°C 0mm 0.22kPa 24135m 0.73m/s 0.47m/s
04:00 ☾
18% -1.4°C 0mm 66% 0cm -18° 4.3°C 0mm 0.28kPa 24135m 0.72m/s 0.41m/s
05:00 ☾
16% -1.1°C 0mm 62% 0cm -10° 5.7°C 0mm 0.35kPa 24135m 0.71m/s 0.35m/s
06:00 ☾
12% -0.7°C 0mm 59% 0cm -1.7° 6.7°C 0mm 0.4kPa 24135m 0.58m/s 0.34m/s
07:00 ☾
8% -0.4°C 0mm 57% 0cm 7.2° 7.7°C 0mm 0.46kPa 24135m 0.46m/s 0.33m/s
08:00 ☾
4% -0.1°C 0mm 54% 0cm 16° 8.7°C 0mm 0.52kPa 24135m 0.34m/s 0.32m/s
09:00 ☾
4% -0.1°C 0mm 53% 0cm 25° 8.9°C 0.02mm 0.53kPa 24135m 0.46m/s 0.45m/s
10:00 ☾
4% -0.2°C 0mm 52% 0cm 33° 9.1°C 0.04mm 0.55kPa 24135m 0.58m/s 0.58m/s
11:00 ☾
4% -0.3°C 0mm 51% 0cm 40° 9.3°C 0.06mm 0.57kPa 24135m 0.7m/s 0.71m/s
12:00 ☾
3% 0.1°C 0mm 60% 0cm 44° 7.4°C 0.06mm 0.42kPa 24135m 0.95m/s 0.97m/s
13:00 ☾
3% 0.2°C 0mm 68% 0cm 46° 5.6°C 0.06mm 0.29kPa 24135m 1.2m/s 1.2m/s
14:00 ☾
2% 0°C 0mm 77% 0cm 44° 3.7°C 0.06mm 0.18kPa 24135m 1.4m/s 1.5m/s
15:00 ☾
1% 0°C 0.007mm 81% 0cm 39° 3°C 0.08mm 0.15kPa 23454m 1.5m/s 1.5m/s
16:00 ☾
1% 0°C 0.01mm 85% 0cm 33° 2.3°C 0.1mm 0.11kPa 22772m 1.5m/s 1.6m/s
17:00 ☾
0% -0.1°C 0.02mm 89% 0cm 24° 1.6°C 0.13mm 0.08kPa 22091m 1.6m/s 1.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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