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Rule Fog Hunter

Invermere - Fog Hunter - Canadian Rockies

Invermere, British Columbia, Canada

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread1.8°C
Visibility24135 (Clear)
Relative Humidity88%
Wind Speed1.5m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Edmonton
fog weather icon
Next opportunity
Dense Fog
Invermere
Mon, Apr 13 · 20:00–24:00 · 4h window
Low confidence
28%
🌫️Fog Probability61.5-91.1%
Dewpoint Spread: 0.4°C
Visibility: 72 (Dense fog)
Relative Humidity: 97%
Wind Speed: 2.5m/s (calm conditions)
fog weather icon
Moderate Fog
Invermere
Thu, Apr 16 · 21:00–22:00
🌫️Fog Probability:61.4%
Low

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/Edmonton
Fog Probability
≥ 60.0%
Wed, Apr 8
01:000%
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Thu, Apr 9
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Fri, Apr 10
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Sat, Apr 11
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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/Edmonton
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
Thu, Apr 9 Sunrise 07:02 Sunset 20:27
01:00 ☾
37% -5.5°C 0mm 88% 0cm -31° -3.7°C 0mm 0.06kPa 24135m 2.1m/s 1.5m/s
02:00 ☾
69% -5.8°C 0mm 88% 0cm -32° -4.1°C 0mm 0.06kPa 24135m 1.5m/s 1.1m/s
03:00 ☾
100% -6.1°C 0mm 88% 0cm -30° -4.3°C 0mm 0.06kPa 23656m 1.3m/s 1.1m/s
04:00 ☾
100% -6.2°C 0mm 87% 0cm -25° -4.4°C 0mm 0.06kPa 23200m 1.1m/s 0.74m/s
05:00 ☾
100% -6.3°C 0mm 87% 0cm -18° -4.5°C 0mm 0.06kPa 23183m 0.81m/s 0.63m/s
06:00 ☾
100% -6.5°C 0mm 86% 0cm -10° -4.6°C 0mm 0.06kPa 23186m 0.9m/s 0.79m/s
07:00 ☾
100% -6.7°C 0mm 86% 0cm -0.95° -4.8°C 0mm 0.06kPa 23178m 0.8m/s 0.67m/s
08:00 ☾
100% -6.2°C 0mm 79% 0cm 8.3° -3.1°C 0mm 0.1kPa 24135m 0.8m/s 0.56m/s
09:00 ☾
100% -5.4°C 0mm 69% 0cm 18° -0.46°C 0mm 0.18kPa 24135m 0.7m/s 0.71m/s
10:00 ☾
100% -4.6°C 0mm 62% 0cm 27° 1.8°C 0mm 0.26kPa 24134m 0.44m/s 0.65m/s
11:00 ☾
100% -3.9°C 0mm 56% 0cm 35° 4°C 0mm 0.36kPa 24135m 0.5m/s 0.75m/s
12:00 ☾
100% -3.5°C 0mm 51% 0cm 42° 5.8°C 0mm 0.45kPa 24135m 0.8m/s 1.1m/s
13:00 ☾
95% -3.6°C 0mm 47% 0cm 46° 7°C 0mm 0.53kPa 24135m 1.2m/s 1.4m/s
14:00 ☾
91% -3.7°C 0mm 44% 0cm 47° 7.8°C 0mm 0.59kPa 24135m 1.9m/s 1.6m/s
15:00 ☾
86% -3.6°C 0mm 43% 0cm 45° 8.2°C 0mm 0.62kPa 24134m 2.4m/s 1.8m/s
16:00 ☾
57% -3.3°C 0mm 44% 0cm 39° 8.3°C 0mm 0.62kPa 24134m 2.3m/s 2m/s
17:00 ☾
29% -3°C 0mm 45% 0cm 31° 8.2°C 0mm 0.6kPa 24135m 1.5m/s 1.9m/s
18:00 ☾
0% -2.5°C 0mm 48% 0cm 23° 7.9°C 0mm 0.55kPa 24134m 1.3m/s 1.7m/s
19:00 ☾
1% -1.1°C 0mm 57% 0cm 13° 6.9°C 0mm 0.43kPa 24135m 1.3m/s 1.3m/s
20:00 ☾
1% -1.3°C 0mm 69% 0cm 4° 3.7°C 0mm 0.24kPa 24135m 0.81m/s 0.88m/s
21:00 ☾
2% -2.7°C 0mm 75% 0cm -5.4° 1.2°C 0mm 0.17kPa 24135m 0.51m/s 0.32m/s
22:00 ☾
12% -3.2°C 0mm 78% 0cm -14° 0.26°C 0mm 0.14kPa 24134m 0.6m/s 0.41m/s
23:00 ☾
23% -3.5°C 0mm 80% 0cm -21° -0.45°C 0mm 0.12kPa 24135m 0.72m/s 0.37m/s
Fri, Apr 10 Sunrise 07:00 Sunset 20:29
24:00 ☾
33% -3.8°C 0mm 82% 0cm -27° -1°C 0mm 0.1kPa 24135m 0.81m/s 0.47m/s
01:00 ☾
54% -4.1°C 0mm 83% 0cm -31° -1.6°C 0mm 0.09kPa 24134m 0.81m/s 0.48m/s
02:00 ☾
75% -4.3°C 0mm 84% 0cm -31° -2°C 0mm 0.09kPa 24134m 0.8m/s 0.49m/s
03:00 ☾
96% -4.6°C 0mm 84% 0cm -29° -2.3°C 0mm 0.08kPa 24135m 0.71m/s 0.44m/s
04:00 ☾
95% -4.8°C 0mm 85% 0cm -25° -2.5°C 0mm 0.08kPa 24135m 0.7m/s 0.42m/s
05:00 ☾
93% -4.8°C 0mm 85% 0cm -18° -2.7°C 0mm 0.08kPa 24135m 0.72m/s 0.47m/s
06:00 ☾
92% -4.9°C 0mm 85% 0cm -9.8° -2.8°C 0mm 0.07kPa 24135m 0.62m/s 0.48m/s
07:00 ☾
71% -5°C 0mm 85% 0cm -0.52° -2.8°C 0mm 0.07kPa 24135m 0.72m/s 0.47m/s
08:00 ☾
49% -4.6°C 0mm 78% 0cm 8.7° -1.2°C 0mm 0.12kPa 24134m 0.5m/s 0.37m/s
09:00 ☾
28% -3.7°C 0mm 68% 0cm 18° 1.5°C 0mm 0.21kPa 24135m 0.42m/s 0.55m/s
10:00 ☾
25% -3°C 0mm 60% 0cm 27° 4°C 0mm 0.32kPa 24134m 0.52m/s 0.64m/s
11:00 ☾
23% -2.3°C 0mm 53% 0cm 36° 6.5°C 0mm 0.45kPa 24135m 0.72m/s 0.65m/s
12:00 ☾
20% -1.9°C 0mm 48% 0cm 42° 8.5°C 0mm 0.58kPa 24134m 0.91m/s 0.8m/s
13:00 ☾
27% -1.7°C 0mm 44% 0cm 47° 10°C 0mm 0.7kPa 24135m 1.1m/s 1m/s
14:00 ☾
35% -1.9°C 0mm 40% 0cm 48° 11°C 0mm 0.79kPa 24135m 1.4m/s 1.2m/s
15:00 ☾
42% -1.9°C 0mm 38% 0cm 45° 12°C 0mm 0.85kPa 24134m 1.5m/s 1.3m/s
16:00 ☾
41% -1.9°C 0mm 37% 0cm 39° 12°C 0mm 0.89kPa 24135m 1.6m/s 1.2m/s
17:00 ☾
39% -1.8°C 0mm 37% 0cm 32° 12°C 0mm 0.89kPa 24135m 1.5m/s 1.2m/s
18:00 ☾
38% -0.2°C 0mm 43% 0cm 23° 12°C 0mm 0.81kPa 24134m 1.5m/s 0.99m/s
19:00 ☾
33% 1.4°C 0mm 54% 0cm 14° 10°C 0mm 0.57kPa 24135m 1.2m/s 0.95m/s
20:00 ☾
28% 0.4°C 0mm 65% 0cm 4.2° 6.6°C 0mm 0.34kPa 24134m 1m/s 1m/s
21:00 ☾
23% -0.4°C 0mm 72% 0cm -5.1° 4.3°C 0mm 0.24kPa 24135m 1m/s 0.85m/s
22:00 ☾
17% -0.9°C 0mm 76% 0cm -14° 3°C 0mm 0.19kPa 24134m 1m/s 0.73m/s
23:00 ☾
11% -1.3°C 0mm 78% 0cm -21° 2.2°C 0mm 0.16kPa 24135m 1.1m/s 0.84m/s
Sat, Apr 11 Sunrise 06:58 Sunset 20:31
24:00 ☾
5% -1.6°C 0mm 79% 0cm -27° 1.6°C 0mm 0.14kPa 24135m 0.91m/s 0.49m/s
01:00 ☾
3% -1.9°C 0mm 80% 0cm -30° 1.1°C 0mm 0.13kPa 24134m 0.92m/s 0.67m/s
02:00 ☾
2% -2°C 0mm 81% 0cm -31° 0.88°C 0mm 0.12kPa 24134m 1.2m/s 1.1m/s
03:00 ☾
0% -2.1°C 0mm 81% 0cm -29° 0.8°C 0mm 0.12kPa 24134m 0.92m/s 0.84m/s
04:00 ☾
0% -2.3°C 0mm 84% 0cm -24° 0.15°C 0mm 0.1kPa 24135m 1m/s 0.92m/s
05:00 ☾
0% -2.3°C 0mm 84% 0cm -18° 0.09°C 0mm 0.1kPa 24135m 1.5m/s 1.3m/s
06:00 ☾
0% -1.9°C 0.07mm 83% 0cm -9.5° 0.59°C 0mm 0.11kPa 24134m 1.4m/s 1.1m/s
07:00 ☾
0% -0.5°C 0.05mm 73% 0cm 0.01° 4°C 0mm 0.22kPa 24134m 1.8m/s 1.8m/s
08:00 ☾
1% 0.6°C 0.03mm 62% 0cm 9° 7.3°C 0mm 0.39kPa 24135m 2.2m/s 2.4m/s
09:00 ☾
1% 1.2°C 0.01mm 52% 0cm 18° 11°C 0mm 0.62kPa 24135m 2.5m/s 3.1m/s
10:00 ☾
1% 1.8°C 0.007mm 55% 0cm 28° 11°C 0.04mm 0.58kPa 24135m 2m/s 2.4m/s
11:00 ☾
1% 2.3°C 0.003mm 57% 0cm 36° 10°C 0.08mm 0.54kPa 24135m 1.5m/s 1.7m/s
12:00 ☾
1% 2.8°C 0mm 60% 0cm 43° 10°C 0.13mm 0.5kPa 24135m 0.91m/s 1.1m/s
13:00 ☾
1% 3.2°C 0.03mm 67% 0cm 47° 9.1°C 0.21mm 0.38kPa 24135m 1.7m/s 1.5m/s
14:00 ☾
0% 3.5°C 0.07mm 74% 0cm 48° 7.9°C 0.29mm 0.28kPa 24135m 2.5m/s 1.9m/s
15:00 ☾
0% 3.6°C 0.1mm 80% 0cm 45° 6.8°C 0.38mm 0.19kPa 24135m 3.3m/s 2.3m/s
16:00 ☾
0% 3.8°C 0.27mm 84% 0cm 40° 6.2°C 0.65mm 0.15kPa 23367m 2.9m/s 2m/s
17:00 ☾
0% 3.9°C 0.44mm 89% 0cm 32° 5.6°C 0.92mm 0.1kPa 22599m 2.4m/s 1.7m/s
18:00 ☾
0% 3.9°C 0.61mm 93% 0cm 23° 5°C 1.2mm 0.06kPa 21830m 1.9m/s 1.4m/s
19:00 ☾
0% 3.7°C 0.73mm 93% 0cm 14° 4.7°C 2.2mm 0.06kPa 14810m 2.4m/s 1.7m/s
20:00 ☾
0% 3.4°C 0.86mm 94% 0cm 4.5° 4.4°C 3.2mm 0.05kPa 7789m 2.9m/s 2m/s
21:00 ☾
0% 3.2°C 0.98mm 94% 0cm -4.9° 4°C 4.2mm 0.05kPa 768m 3.4m/s 2.3m/s
22:00 ☾
0% 2.9°C 0.82mm 95% 0cm -13° 3.5°C 4.7mm 0.04kPa 545m 2.9m/s 2m/s
23:00 ☾
0% 2.5°C 0.67mm 96% 0cm -21° 3°C 5.3mm 0.03kPa 322m 2.3m/s 1.7m/s
Sun, Apr 12 Sunrise 06:56 Sunset 20:32
24:00 ☾
0% 2.2°C 0.51mm 98% 0cm -27° 2.5°C 5.8mm 0.02kPa 99m 1.8m/s 1.4m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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