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Rule Fog Hunter

Cochrane - Fog Hunter - Canadian Rockies

Cochrane, Alberta, Canada

Thick, moody fog for atmospheric forest and landscape shots

No opportunities right now
Here’s what usually blocks matches

No Fog Hunter opportunities in the next 14 days

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Rule requirements (key thresholds)
Fog Probability · ≥ 60.0%

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Fog Probability 100% failing

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread3.5°C
Visibility24134 (Clear)
Relative Humidity78%
Wind Speed2.2m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Edmonton

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

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 75 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 60.0%
Sun, Apr 19
22:000%
23:000%
Mon, Apr 20
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%
Tue, Apr 21
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%
Wed, Apr 22
24:000%
01:0028%
02:0036%
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%
Thu, Apr 23
24:000%
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
Mon, Apr 20 Sunrise 06:32 Sunset 20:42
02:00 ☾
6% 1.1°C 0mm 78% 0cm -27° 4.6°C 0mm 0.19kPa 24134m 2.1m/s 2.2m/s
03:00 ☾
9% 1°C 0mm 80% 0cm -25° 4.1°C 0mm 0.16kPa 24135m 1.5m/s 1.7m/s
04:00 ☾
8% 1°C 0mm 83% 0cm -20° 3.7°C 0mm 0.14kPa 24135m 1.3m/s 1.4m/s
05:00 ☾
7% 0.6°C 0mm 84% 0cm -13° 3°C 0mm 0.12kPa 24134m 1.4m/s 1.5m/s
06:00 ☾
6% 0.2°C 0mm 85% 0cm -5.4° 2.4°C 0mm 0.11kPa 24135m 1m/s 1.1m/s
07:00
22% 0.1°C 0mm 85% 0cm 3.6° 2.3°C 0mm 0.11kPa 24134m 1m/s 1m/s
08:00
38% 1.1°C 0mm 82% 0cm 13° 4°C 0mm 0.15kPa 24135m 2.8m/s 1.5m/s
09:00
54% 2.9°C 0mm 78% 0cm 22° 6.5°C 0mm 0.21kPa 24134m 6.5m/s 3.2m/s
10:00
58% 3.6°C 0mm 72% 0cm 31° 8.4°C 0mm 0.31kPa 24134m 7.3m/s 4.8m/s
11:00
62% 4°C 0mm 65% 0cm 39° 10°C 0mm 0.43kPa 24135m 6.6m/s 5.5m/s
12:00
66% 4.3°C 0mm 59% 0cm 46° 12°C 0mm 0.57kPa 24134m 5.7m/s 5.2m/s
13:00
77% 4.7°C 0mm 55% 0cm 50° 13°C 0mm 0.69kPa 24135m 4.8m/s 4.4m/s
14:00
89% 5.2°C 0mm 52% 0cm 50° 15°C 0mm 0.8kPa 24134m 4.6m/s 3.8m/s
15:00
100% 5.2°C 0mm 48% 0cm 47° 16°C 0mm 0.97kPa 24135m 5.5m/s 2.9m/s
16:00
99% 3°C 0mm 38% 0cm 41° 18°C 0mm 1.2kPa 24135m 5.8m/s 2.8m/s
17:00
99% 2.4°C 0mm 36% 0cm 33° 18°C 0mm 1.3kPa 24134m 5.9m/s 4.3m/s
18:00 ☾
98% 3.7°C 0mm 41% 0cm 24° 17°C 0mm 1.1kPa 24134m 5.6m/s 4.1m/s
19:00 ☾
67% 5.1°C 0mm 49% 0cm 15° 16°C 0mm 0.9kPa 24135m 5.4m/s 3.3m/s
20:00 ☾
36% 4.7°C 0mm 56% 0cm 5.7° 13°C 0mm 0.66kPa 24134m 2.6m/s 2.6m/s
21:00 ☾
5% 3.3°C 0mm 58% 0cm -3.3° 11°C 0mm 0.57kPa 24135m 2m/s 2.1m/s
22:00 ☾
3% 3.5°C 0mm 61% 0cm -11° 11°C 0mm 0.5kPa 24135m 2.1m/s 2.3m/s
23:00 ☾
2% 4.2°C 0mm 69% 0cm -18° 9.7°C 0mm 0.38kPa 24134m 2.6m/s 2.8m/s
Tue, Apr 21 Sunrise 06:30 Sunset 20:44
24:00 ☾
0% 4.3°C 0mm 74% 0cm -24° 8.6°C 0mm 0.29kPa 24134m 3.3m/s 2.8m/s
01:00 ☾
0% 3.9°C 0mm 73% 0cm -26° 8.3°C 0mm 0.29kPa 24135m 3.3m/s 2.8m/s
02:00 ☾
0% 3.4°C 0mm 72% 0cm -27° 8.1°C 0mm 0.3kPa 24134m 3.7m/s 3.1m/s
03:00 ☾
0% 2.8°C 0mm 69% 0cm -24° 8.1°C 0mm 0.33kPa 24135m 3.2m/s 2.7m/s
04:00 ☾
0% 2.7°C 0mm 70% 0cm -20° 7.9°C 0mm 0.32kPa 24134m 1.9m/s 2m/s
05:00 ☾
0% 2.5°C 0mm 71% 0cm -13° 7.5°C 0mm 0.3kPa 24134m 1.4m/s 1.5m/s
06:00 ☾
0% 2.3°C 0mm 74% 0cm -5.1° 6.7°C 0mm 0.26kPa 24134m 1.6m/s 1.7m/s
07:00
0% 2.8°C 0mm 78% 0cm 3.9° 6.3°C 0mm 0.2kPa 24134m 2.4m/s 2.6m/s
08:00
1% 4.1°C 0mm 80% 0cm 13° 7.3°C 0mm 0.2kPa 24135m 4.5m/s 2.4m/s
09:00
1% 5°C 0mm 78% 0cm 22° 8.7°C 0mm 0.25kPa 24134m 4.7m/s 2.8m/s
10:00
1% 5.7°C 0mm 72% 0cm 31° 11°C 0mm 0.37kPa 24134m 3.9m/s 2.8m/s
11:00
1% 5.5°C 0.01mm 65% 0cm 40° 12°C 0mm 0.48kPa 24134m 2.9m/s 3.1m/s
12:00
1% 5.5°C 0mm 62% 0cm 46° 13°C 0mm 0.56kPa 24134m 2.7m/s 3.3m/s
13:00
5% 5.3°C 0mm 59% 0cm 50° 13°C 0mm 0.63kPa 24134m 3.2m/s 3.5m/s
14:00
10% 5°C 0mm 55% 0cm 51° 14°C 0mm 0.72kPa 24135m 4.3m/s 4.1m/s
15:00
14% 5.1°C 0mm 54% 0cm 47° 14°C 0mm 0.75kPa 24135m 5.6m/s 5.1m/s
16:00
12% 5.2°C 0mm 57% 0cm 41° 14°C 0.06mm 0.67kPa 24119m 6.8m/s 5.7m/s
17:00
10% 4.9°C 0mm 54% 0cm 33° 14°C 0.13mm 0.75kPa 24106m 7.3m/s 6.2m/s
18:00 ☾
8% 5.7°C 0mm 57% 0cm 25° 14°C 0.19mm 0.7kPa 24135m 7.9m/s 6.5m/s
19:00 ☾
6% 5.8°C 0mm 60% 0cm 15° 13°C 0mm 0.62kPa 24135m 9.8m/s 6.5m/s
20:00 ☾
5% 5.7°C 0mm 67% 0cm 6° 11°C 0.56mm 0.44kPa 10690m 11m/s 5.7m/s
21:00 ☾
3% 5.1°C 0mm 74% 0cm -3° 9.6°C 1mm 0.32kPa 24134m 11m/s 4.3m/s
22:00 ☾
2% 5.2°C 0mm 77% 0cm -11° 9°C 1.2mm 0.27kPa 8345m 7.3m/s 2.8m/s
23:00 ☾
2% 5.9°C 0mm 86% 0cm -18° 8°C 1.8mm 0.15kPa 11312m 1.3m/s 1.4m/s
Wed, Apr 22 Sunrise 06:28 Sunset 20:45
24:00 ☾
1% 6.2°C 0mm 92% 0cm -23° 7.4°C 2.5mm 0.08kPa 11830m 2.4m/s 2m/s
01:00 ☾
1% 6.5°C 0mm 95% 0cm -26° 7.2°C 0.56mm 0.05kPa 15179m 4.1m/s 2.4m/s
02:00 ☾
0% 6.4°C 0mm 96% 0cm -26° 6.9°C 0.94mm 0.04kPa 24126m 5.9m/s 3.4m/s
03:00 ☾
0% 6.3°C 0mm 98% 0cm -24° 6.6°C 1.2mm 0.02kPa 1687m 6.9m/s 4.3m/s
04:00 ☾
0% 5.5°C 0mm 96% 0cm -19° 6.2°C 1.3mm 0.04kPa 5784m 7.5m/s 5.4m/s
05:00 ☾
0% 4°C 0mm 94% 0cm -13° 4.8°C 1.4mm 0.05kPa 20112m 8.8m/s 6m/s
06:00 ☾
0% 3.6°C 0.02mm 94% 0cm -4.8° 4.5°C 1.4mm 0.05kPa 24124m 8.3m/s 5.3m/s
07:00
0% 3.2°C 0.11mm 90% 0cm 4.2° 4.8°C 1.1mm 0.09kPa 23540m 9.4m/s 5.7m/s
08:00
0% 2.9°C 0.19mm 86% 0cm 13° 5.1°C 0.77mm 0.13kPa 22957m 11m/s 6.1m/s
09:00
0% 2.5°C 0.28mm 82% 0cm 23° 5.4°C 0.44mm 0.16kPa 22373m 12m/s 6.5m/s
10:00
0% 2°C 0.6mm 86% 0.41cm 32° 4°C 1.4mm 0.11kPa 14944m 13m/s 6.7m/s
11:00
0% 1.4°C 0.91mm 91% 0.82cm 40° 2.7°C 2.3mm 0.07kPa 7514m 14m/s 6.9m/s
12:00
0% 0.9°C 1.2mm 96% 1.2cm 47° 1.4°C 3.2mm 0.03kPa 85m 15m/s 7.1m/s
13:00
0% 0.3°C 0.99mm 95% 0.99cm 51° 1°C 3.2mm 0.03kPa 371m 15m/s 7.4m/s
14:00
0% -0.2°C 0.74mm 94% 0.74cm 51° 0.65°C 3.2mm 0.04kPa 657m 15m/s 7.7m/s
15:00
0% -0.8°C 0.5mm 92% 0.5cm 48° 0.27°C 3.2mm 0.05kPa 943m 16m/s 8m/s
16:00
0% -1.5°C 0.42mm 91% 0.42cm 42° -0.16°C 3.6mm 0.05kPa 1487m 16m/s 8.4m/s
17:00
0% -2.1°C 0.34mm 90% 0.34cm 34° -0.59°C 4mm 0.06kPa 2031m 17m/s 8.8m/s
18:00 ☾
0% -2.8°C 0.26mm 88% 0.26cm 25° -1°C 4.4mm 0.07kPa 2574m 17m/s 9.2m/s
19:00 ☾
0% -3.6°C 0.17mm 84% 0.18cm 15° -1.3°C 3mm 0.09kPa 9761m 17m/s 9.1m/s
20:00 ☾
0% -4.5°C 0.09mm 80% 0.09cm 6.2° -1.5°C 1.6mm 0.11kPa 16948m 17m/s 9m/s
21:00 ☾
0% -5.4°C 0mm 76% 0cm -2.7° -1.8°C 0.19mm 0.13kPa 24135m 17m/s 8.9m/s
22:00 ☾
0% -5.6°C 0mm 77% 0cm -11° -2°C 0.19mm 0.12kPa 24135m 17m/s 8.3m/s
23:00 ☾
0% -5.7°C 0mm 77% 0cm -18° -2.2°C 0.19mm 0.12kPa 24135m 16m/s 7.7m/s
Thu, Apr 23 Sunrise 06:26 Sunset 20:47
24:00 ☾
0% -5.8°C 0mm 78% 0cm -23° -2.5°C 0.19mm 0.11kPa 24135m 15m/s 7.1m/s
01:00 ☾
0% -5.6°C 0mm 76% 0cm -26° -1.8°C 0.13mm 0.13kPa 24135m 15m/s 7.3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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