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Rule Fog Hunter

Cochrane - Fog Hunter - Canadian Rockies

Cochrane, Alberta, Canada

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
89%
Dewpoint Spread0.4°C
Visibility24135 (Clear)
Relative Humidity98%
Wind Speed1.9m/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
Cochrane
Today · 01:00–06:00 · 5h window
Medium confidence
63%
🌫️Fog Probability61.4-88.6%
Dewpoint Spread: 0.4°C
Visibility: 24135 (Clear)
Relative Humidity: 98%
Wind Speed: 1.9m/s (calm conditions)
fog weather icon
Moderate Fog at Sunrise
Cochrane
Today · 06:00–08:00
🌫️Fog Probability:66.7%
Low
fog weather icon
Moderate Fog
Cochrane
Sat, Apr 11 · 20:00–22:00
🌫️Fog Probability:66.7%
Low
fog weather icon
Moderate Fog
Cochrane
Sun, Apr 12 · 15:00–16:00
🌫️Fog Probability:61.7%
Low
fog weather icon
Dense Fog
Cochrane
Sun, Apr 12 · 20:00–22:00
🌫️Fog Probability:79.7-91.1%
High
fog weather icon
Dense Fog
Cochrane
Mon, Apr 13 · 03:00–04:00
🌫️Fog Probability:88.6%
Medium
fog weather icon
Dense Fog
Cochrane
Thu, Apr 16 · 21:00–02:00
🌫️Fog Probability:79.7-100%
High

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
9matching hours in the next 74 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 60.0%
Wed, Apr 8
22:000%
23:000%
Thu, Apr 9
24:000%
01:0089%
02:0089%
03:0078%
04:0061%
05:0061%
06:0067%
07:0067%
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%
15:0012%
16:0012%
17:0025%
18:000%
19:000%
20:0067%
21:0067%
22:000%
23:000%
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/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 06:55 Sunset 20:22
01:00 ☾
13% -3.4°C 0mm 98% 0cm -31° -3°C 0mm 0.01kPa 24135m 2.5m/s 1.9m/s
02:00 ☾
25% -4.4°C 0mm 98% 0cm -31° -4.1°C 0mm 0.01kPa 23571m 1.7m/s 1.8m/s
03:00 ☾
38% -4.7°C 0mm 97% 0cm -29° -4.3°C 0mm 0.01kPa 23834m 2m/s 2.1m/s
04:00 ☾
42% -4.3°C 0mm 95% 0cm -24° -3.7°C 0mm 0.02kPa 24135m 1.8m/s 1.9m/s
05:00 ☾
45% -5°C 0mm 96% 0cm -17° -4.5°C 0mm 0.02kPa 24134m 1.5m/s 1.6m/s
06:00 ☾
49% -6°C 0mm 96% 0cm -9° -5.5°C 0mm 0.02kPa 24134m 1.3m/s 1.5m/s
07:00 ☾
38% -6°C 0mm 96% 0cm 0.39° -5.5°C 0mm 0.02kPa 23838m 1.2m/s 1.2m/s
08:00 ☾
27% -4.8°C 0mm 91% 0cm 9.3° -3.6°C 0mm 0.04kPa 23755m 0.9m/s 0.94m/s
09:00 ☾
16% -3.8°C 0.01mm 90% 0cm 19° -2.4°C 0mm 0.05kPa 14448m 0.8m/s 0.62m/s
10:00 ☾
14% -2.8°C 0.01mm 89% 0cm 28° -1.2°C 0mm 0.06kPa 12450m 0.54m/s 0.16m/s
11:00 ☾
11% -2.2°C 0mm 87% 0cm 36° -0.36°C 0mm 0.08kPa 24114m 1.3m/s 1.3m/s
12:00 ☾
9% -2°C 0mm 85% 0cm 42° 0.23°C 0.06mm 0.09kPa 24105m 2.5m/s 2.2m/s
13:00 ☾
6% -2.1°C 0mm 81% 0cm 46° 0.88°C 0mm 0.13kPa 24130m 3.2m/s 2.6m/s
14:00 ☾
3% -2.2°C 0mm 75% 0cm 46° 1.7°C 0mm 0.17kPa 24131m 3.2m/s 2.8m/s
15:00 ☾
0% -2.1°C 0mm 71% 0cm 44° 2.6°C 0mm 0.21kPa 24134m 2.9m/s 2.7m/s
16:00 ☾
0% -2.1°C 0mm 68% 0cm 38° 3.2°C 0mm 0.24kPa 24134m 3.2m/s 2.6m/s
17:00 ☾
0% -2.1°C 0mm 66% 0cm 30° 3.6°C 0mm 0.26kPa 24135m 4.1m/s 2.9m/s
18:00 ☾
0% -1.7°C 0mm 68% 0cm 22° 3.7°C 0mm 0.26kPa 24134m 4.7m/s 2.9m/s
19:00 ☾
24% -0.8°C 0mm 77% 0cm 12° 2.9°C 0mm 0.17kPa 24135m 2.9m/s 2m/s
20:00 ☾
47% -2.3°C 0mm 78% 0cm 3.2° 1°C 0mm 0.14kPa 24135m 1.4m/s 1.5m/s
21:00 ☾
71% -3°C 0mm 79% 0cm -6.1° 0.1°C 0mm 0.13kPa 24135m 1.7m/s 1.7m/s
22:00 ☾
77% -3.4°C 0mm 81% 0cm -14° -0.54°C 0mm 0.11kPa 24134m 1.8m/s 1.8m/s
23:00 ☾
82% -3.4°C 0mm 83% 0cm -22° -0.95°C 0mm 0.1kPa 24135m 1.5m/s 1.5m/s
Fri, Apr 10 Sunrise 06:53 Sunset 20:24
24:00 ☾
88% -3.4°C 0mm 84% 0cm -27° -1.1°C 0mm 0.09kPa 24135m 1.4m/s 1.5m/s
01:00 ☾
86% -3.3°C 0mm 87% 0cm -30° -1.4°C 0mm 0.07kPa 24134m 1.9m/s 2m/s
02:00 ☾
85% -3.3°C 0mm 89% 0cm -31° -1.8°C 0mm 0.06kPa 24134m 1.7m/s 1.7m/s
03:00 ☾
83% -3.4°C 0mm 90% 0cm -28° -1.9°C 0mm 0.05kPa 24135m 1.5m/s 1.5m/s
04:00 ☾
82% -3.5°C 0mm 90% 0cm -23° -2°C 0mm 0.05kPa 24135m 1.5m/s 1.5m/s
05:00 ☾
81% -3.7°C 0mm 90% 0cm -17° -2.3°C 0mm 0.05kPa 24135m 1.3m/s 1.4m/s
06:00 ☾
80% -3.9°C 0mm 89% 0cm -8.6° -2.4°C 0mm 0.06kPa 24135m 1.4m/s 1.5m/s
07:00 ☾
65% -4.2°C 0mm 87% 0cm 0.68° -2.3°C 0mm 0.07kPa 24135m 1.5m/s 1.7m/s
08:00 ☾
49% -4.1°C 0mm 82% 0cm 9.6° -1.4°C 0mm 0.1kPa 24134m 1.7m/s 1.5m/s
09:00 ☾
34% -3.9°C 0mm 73% 0cm 19° 0.35°C 0mm 0.17kPa 24135m 1.7m/s 1.5m/s
10:00 ☾
35% -3.4°C 0mm 67% 0cm 28° 2.2°C 0mm 0.24kPa 24134m 1.6m/s 1.5m/s
11:00 ☾
37% -2.6°C 0mm 62% 0cm 36° 4.1°C 0mm 0.31kPa 24135m 1.6m/s 1.5m/s
12:00 ☾
38% -1.9°C 0mm 58% 0cm 42° 5.7°C 0mm 0.38kPa 24134m 1.5m/s 1.3m/s
13:00 ☾
46% -1.3°C 0mm 56% 0cm 46° 6.9°C 0mm 0.44kPa 24135m 1.5m/s 1.7m/s
14:00 ☾
53% -0.7°C 0mm 55% 0cm 47° 7.8°C 0mm 0.48kPa 24135m 1.5m/s 2m/s
15:00 ☾
61% -0.2°C 0mm 55% 0cm 44° 8.3°C 0mm 0.5kPa 24134m 1.3m/s 1.9m/s
16:00 ☾
63% 0.2°C 0mm 55% 0cm 38° 8.7°C 0mm 0.51kPa 24135m 1.3m/s 1.7m/s
17:00 ☾
64% 0.5°C 0mm 56% 0cm 31° 8.9°C 0mm 0.51kPa 24135m 0.72m/s 1m/s
18:00 ☾
66% 1.4°C 0mm 60% 0cm 22° 8.6°C 0mm 0.44kPa 24134m 0.81m/s 0.84m/s
19:00 ☾
58% 1.5°C 0mm 68% 0cm 13° 7°C 0mm 0.32kPa 24135m 0.41m/s 0.37m/s
20:00 ☾
51% -0.4°C 0mm 70% 0cm 3.4° 4.6°C 0mm 0.25kPa 24134m 0.4m/s 0.43m/s
21:00 ☾
43% -1°C 0mm 72% 0cm -5.8° 3.5°C 0mm 0.22kPa 24135m 1m/s 1.1m/s
22:00 ☾
37% -1.1°C 0mm 75% 0cm -14° 3°C 0mm 0.19kPa 24134m 1.5m/s 1.6m/s
23:00 ☾
31% -1.3°C 0mm 78% 0cm -21° 2.1°C 0mm 0.16kPa 24135m 1.7m/s 1.8m/s
Sat, Apr 11 Sunrise 06:51 Sunset 20:25
24:00 ☾
25% -1.2°C 0mm 81% 0cm -27° 1.7°C 0mm 0.13kPa 24135m 1.8m/s 1.9m/s
01:00 ☾
17% -1.2°C 0mm 83% 0cm -30° 1.4°C 0mm 0.11kPa 24134m 1.9m/s 2.1m/s
02:00 ☾
8% -1.2°C 0mm 85% 0cm -30° 1.1°C 0mm 0.1kPa 24134m 2m/s 2.2m/s
03:00 ☾
0% -1.2°C 0mm 85% 0cm -28° 1.1°C 0mm 0.1kPa 24134m 2.2m/s 2.4m/s
04:00 ☾
0% -1.2°C 0mm 85% 0cm -23° 1.1°C 0mm 0.1kPa 24135m 2.5m/s 2.7m/s
05:00 ☾
0% -1.3°C 0mm 84% 0cm -16° 1.1°C 0mm 0.1kPa 24135m 2.2m/s 2.3m/s
06:00 ☾
0% -1.6°C 0mm 85% 0cm -8.3° 0.69°C 0mm 0.1kPa 24134m 2.3m/s 2.4m/s
07:00 ☾
0% -0.5°C 0mm 80% 0cm 0.96° 2.6°C 0mm 0.15kPa 24134m 2.2m/s 2.5m/s
08:00 ☾
0% 0.6°C 0mm 75% 0cm 10° 4.6°C 0mm 0.21kPa 24135m 2.1m/s 2.5m/s
09:00 ☾
0% 1.6°C 0mm 71% 0cm 19° 6.5°C 0mm 0.28kPa 24135m 1.9m/s 2.5m/s
10:00 ☾
0% 1.6°C 0mm 72% 0cm 28° 6.3°C 0.1mm 0.27kPa 24088m 2.6m/s 2.5m/s
11:00 ☾
0% 1.6°C 0mm 73% 0cm 36° 6°C 0.21mm 0.25kPa 24041m 3.3m/s 2.5m/s
12:00 ☾
0% 1.6°C 0mm 74% 0cm 43° 5.8°C 0.31mm 0.24kPa 23993m 3.9m/s 2.5m/s
13:00 ☾
1% 1.5°C 0.06mm 78% 0cm 47° 5.1°C 0.27mm 0.19kPa 16483m 4.4m/s 2.6m/s
14:00 ☾
1% 1.4°C 0.13mm 81% 0cm 47° 4.3°C 0.23mm 0.15kPa 8973m 4.9m/s 2.7m/s
15:00 ☾
2% 1.3°C 0.19mm 85% 0cm 44° 3.6°C 0.19mm 0.12kPa 1463m 5.4m/s 2.8m/s
16:00 ☾
1% 1.4°C 0.21mm 90% 0.09cm 38° 2.9°C 0.58mm 0.08kPa 985m 5.2m/s 2.5m/s
17:00 ☾
1% 1.4°C 0.23mm 95% 0.17cm 31° 2.2°C 0.98mm 0.04kPa 507m 5m/s 2.3m/s
18:00 ☾
0% 1.4°C 0.25mm 99% 0.26cm 22° 1.5°C 1.4mm 0kPa 29m 4.7m/s 2m/s
19:00 ☾
0% 1.3°C 0.27mm 99% 0.28cm 13° 1.4°C 1.1mm 0kPa 27m 4.4m/s 1.9m/s
20:00 ☾
0% 1.2°C 0.29mm 99% 0.31cm 3.6° 1.3°C 0.83mm 0kPa 25m 4.1m/s 1.8m/s
21:00 ☾
0% 1.1°C 0.31mm 100% 0.33cm -5.6° 1.1°C 0.56mm 0kPa 24m 3.8m/s 1.7m/s
22:00 ☾
0% 0.7°C 0.36mm 99% 0.38cm -14° 0.73°C 1mm 0kPa 27m 4.1m/s 1.8m/s
23:00 ☾
0% 0.2°C 0.41mm 99% 0.43cm -21° 0.33°C 1.5mm 0kPa 31m 4.3m/s 2m/s
Sun, Apr 12 Sunrise 06:49 Sunset 20:27
24:00 ☾
0% -0.2°C 0.46mm 99% 0.47cm -26° -0.07°C 1.9mm 0kPa 35m 4.6m/s 2.1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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