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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 · ≥ 75.0%

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 Spread3.9°C
Visibility24134 (Clear)
Relative Humidity76%
Wind Speed1.7m/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 81 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 75.0%
Sun, May 17
22:000%
23:000%
Mon, May 18
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, May 19
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, May 20
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:0061%
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, May 21
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
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, May 18 Sunrise 05:43 Sunset 21:26
08:00
75% -1.4°C 0mm 76% 0cm 19° 2.5°C 0mm 0.18kPa 24134m 1.7m/s 1.7m/s
09:00
81% -0.4°C 0mm 69% 0cm 29° 4.8°C 0mm 0.27kPa 24134m 1.3m/s 1.5m/s
10:00
77% 0.1°C 0mm 62% 0cm 38° 6.9°C 0mm 0.38kPa 24134m 1m/s 1.4m/s
11:00
73% -0.2°C 0mm 55% 0cm 46° 8.2°C 0mm 0.49kPa 24134m 1.8m/s 2.1m/s
12:00
69% -0.5°C 0mm 50% 0cm 53° 9.5°C 0.19mm 0.6kPa 24135m 2.1m/s 2.4m/s
13:00
49% 0°C 0mm 48% 0cm 58° 10°C 0.31mm 0.65kPa 15701m 1.7m/s 1.8m/s
14:00
30% 0.5°C 0mm 47% 0cm 58° 11°C 0.63mm 0.7kPa 24112m 1.4m/s 1.3m/s
15:00
10% 0.3°C 0mm 47% 0cm 54° 11°C 1.1mm 0.7kPa 24135m 1m/s 0.62m/s
16:00
7% 0.2°C 0.03mm 51% 0cm 48° 9.9°C 1.1mm 0.59kPa 24134m 1m/s 1.2m/s
17:00
4% 1°C 0mm 55% 0cm 39° 9.6°C 1.1mm 0.54kPa 24134m 1.4m/s 2.2m/s
18:00 ☾
1% 1.6°C 0.01mm 57% 0cm 30° 9.7°C 1.1mm 0.52kPa 24124m 2m/s 2.6m/s
19:00 ☾
1% 1.8°C 0mm 59% 0cm 21° 9.6°C 0mm 0.49kPa 24134m 3m/s 2.9m/s
20:00 ☾
0% 2.5°C 0mm 65% 0cm 11° 8.7°C 0mm 0.4kPa 24134m 5.4m/s 3.6m/s
21:00 ☾
0% 2.4°C 0mm 73% 0cm 3° 6.9°C 0mm 0.27kPa 24134m 7.4m/s 3.8m/s
22:00 ☾
0% 2.2°C 0mm 84% 0cm -4.9° 4.7°C 0mm 0.14kPa 24134m 5.8m/s 3.1m/s
23:00 ☾
0% 2°C 0mm 87% 0cm -11° 3.9°C 0mm 0.1kPa 24134m 2.9m/s 2.4m/s
Tue, May 19 Sunrise 05:41 Sunset 21:27
24:00 ☾
0% 1.7°C 0mm 87% 0cm -16° 3.8°C 0mm 0.11kPa 24134m 1.9m/s 1.9m/s
01:00 ☾
4% 1.5°C 0mm 86% 0cm -19° 3.6°C 0mm 0.11kPa 24134m 1.8m/s 1.9m/s
02:00 ☾
8% 0.7°C 0mm 85% 0cm -19° 3.1°C 0mm 0.12kPa 24135m 1.9m/s 2m/s
03:00 ☾
12% 0°C 0mm 82% 0cm -17° 2.7°C 0mm 0.13kPa 24135m 1.8m/s 2m/s
04:00 ☾
11% -0.6°C 0mm 80% 0cm -12° 2.6°C 0mm 0.15kPa 24135m 1.8m/s 2m/s
05:00 ☾
9% -0.9°C 0mm 78% 0cm -5.9° 2.6°C 0mm 0.16kPa 24134m 1.8m/s 2m/s
06:00
8% -1°C 0mm 77% 0cm 1.9° 2.6°C 0mm 0.17kPa 24134m 1.8m/s 2m/s
07:00
10% -0.2°C 0mm 74% 0cm 10° 4.1°C 0mm 0.21kPa 24134m 1.5m/s 1.3m/s
08:00
12% 0°C 0mm 64% 0cm 19° 6.2°C 0mm 0.34kPa 24134m 1.3m/s 1.2m/s
09:00
14% 0.7°C 0mm 59% 0cm 29° 8.3°C 0mm 0.45kPa 24134m 1.6m/s 1.2m/s
10:00
12% 1.3°C 0mm 54% 0cm 38° 10°C 0mm 0.58kPa 24135m 2.5m/s 1.8m/s
11:00
9% 1.5°C 0mm 48% 0cm 47° 12°C 0mm 0.73kPa 24134m 2.7m/s 2.1m/s
12:00
7% 1.2°C 0mm 44% 0cm 54° 13°C 0mm 0.85kPa 24135m 3m/s 2.2m/s
13:00
5% 1.1°C 0mm 41% 0cm 58° 14°C 0mm 0.95kPa 24134m 3.8m/s 2.6m/s
14:00
2% 1°C 0mm 41% 0cm 58° 14°C 0mm 0.96kPa 24134m 2.9m/s 1.5m/s
15:00
0% 1.7°C 0mm 41% 0cm 55° 15°C 0mm 0.99kPa 24135m 3.1m/s 2.9m/s
16:00
0% 2.4°C 0.1mm 45% 0cm 48° 14°C 0.06mm 0.87kPa 24135m 2.9m/s 2m/s
17:00
0% 4.5°C 0.03mm 65% 0cm 39° 11°C 0.38mm 0.45kPa 24134m 2.7m/s 3.6m/s
18:00 ☾
0% 5.3°C 0mm 65% 0cm 30° 12°C 0.38mm 0.48kPa 24134m 4.1m/s 4.1m/s
19:00 ☾
0% 5.5°C 0mm 73% 0cm 21° 10°C 0.5mm 0.33kPa 23651m 5.2m/s 4.7m/s
20:00 ☾
0% 5.3°C 0mm 79% 0cm 12° 8.8°C 1.5mm 0.24kPa 23717m 7.8m/s 4.8m/s
21:00 ☾
0% 5.6°C 0.07mm 88% 0cm 3.2° 7.5°C 1.9mm 0.12kPa 23809m 9.4m/s 5.3m/s
22:00 ☾
0% 5.4°C 0.37mm 92% 0cm -4.7° 6.7°C 2.3mm 0.08kPa 17713m 5.7m/s 2.4m/s
23:00 ☾
0% 5.4°C 0.37mm 93% 0cm -11° 6.5°C 2.8mm 0.07kPa 11953m 0.3m/s 0.33m/s
Wed, May 20 Sunrise 05:40 Sunset 21:29
24:00 ☾
0% 5.2°C 1.3mm 92% 0cm -16° 6.5°C 3.8mm 0.08kPa 7452m 2.5m/s 2m/s
01:00 ☾
1% 4.8°C 1.1mm 92% 0cm -18° 6°C 1.4mm 0.07kPa 8887m 4.3m/s 3.4m/s
02:00 ☾
2% 4.1°C 0.55mm 93% 0cm -19° 5.1°C 2.3mm 0.06kPa 23425m 6.5m/s 5.1m/s
03:00 ☾
3% 3°C 0.47mm 89% 0cm -16° 4.6°C 2.6mm 0.09kPa 23388m 8.8m/s 4.9m/s
04:00 ☾
2% 2.5°C 0.76mm 88% 0cm -12° 4.3°C 3.2mm 0.1kPa 13925m 7.5m/s 4.7m/s
05:00 ☾
1% 2.5°C 0.18mm 92% 0cm -5.7° 3.7°C 3.6mm 0.07kPa 24133m 4.8m/s 3m/s
06:00
0% 2.6°C 0.52mm 94% 0cm 2.1° 3.6°C 3.9mm 0.05kPa 18499m 4.8m/s 3.2m/s
07:00
0% 2.6°C 0.86mm 96% 0cm 10° 3.2°C 0.81mm 0.03kPa 635m 4.9m/s 2.4m/s
08:00
0% 2.3°C 0.08mm 91% 0cm 19° 3.7°C 1.3mm 0.07kPa 2731m 3.9m/s 1.4m/s
09:00
0% 1.8°C 0.25mm 80% 0cm 29° 4.9°C 1.4mm 0.17kPa 9191m 8.1m/s 3.5m/s
10:00
0% 1.6°C 1.1mm 79% 0cm 38° 4.9°C 2.1mm 0.18kPa 9451m 9.6m/s 4.2m/s
11:00
0% 2.2°C 0.8mm 83% 0cm 47° 4.7°C 2.9mm 0.14kPa 16101m 10m/s 5m/s
12:00
0% 2°C 0.35mm 80% 0cm 54° 5.1°C 3.6mm 0.17kPa 23917m 5.9m/s 3.6m/s
13:00
1% 2.2°C 0.24mm 82% 0cm 58° 5.1°C 2.6mm 0.16kPa 23990m 5.8m/s 3.4m/s
14:00
2% 2.4°C 0.13mm 83% 0cm 59° 5.1°C 1.5mm 0.15kPa 24062m 5.7m/s 3.2m/s
15:00
3% 2.7°C 0.02mm 84% 0cm 55° 5.2°C 0.5mm 0.14kPa 24135m 5.6m/s 3m/s
16:00
2% 1.9°C 0.01mm 84% 0cm 48° 4.3°C 0.5mm 0.13kPa 24135m 5.8m/s 3m/s
17:00
1% 1.1°C 0.007mm 85% 0cm 39° 3.4°C 0.5mm 0.12kPa 24135m 5.9m/s 3.1m/s
18:00 ☾
0% 0.4°C 0mm 86% 0cm 30° 2.5°C 0.5mm 0.1kPa 24135m 6m/s 3.2m/s
19:00 ☾
0% -0.1°C 0mm 85% 0cm 21° 2.2°C 0.33mm 0.11kPa 24135m 4.8m/s 3m/s
20:00 ☾
1% -0.5°C 0mm 84% 0cm 12° 1.9°C 0.17mm 0.11kPa 24135m 3.6m/s 2.8m/s
21:00 ☾
1% -1°C 0mm 83% 0cm 3.3° 1.6°C 0mm 0.12kPa 24135m 2.3m/s 2.6m/s
22:00 ☾
2% -1.3°C 0mm 83% 0cm -4.5° 1.3°C 0mm 0.12kPa 24135m 2.3m/s 2.5m/s
23:00 ☾
2% -1.5°C 0mm 83% 0cm -11° 1.1°C 0mm 0.11kPa 24135m 2.2m/s 2.5m/s
Thu, May 21 Sunrise 05:39 Sunset 21:30
24:00 ☾
3% -1.8°C 0mm 83% 0cm -16° 0.79°C 0mm 0.11kPa 24135m 2.1m/s 2.4m/s
01:00 ☾
17% -0.8°C 0mm 75% 0cm -18° 3.1°C 0mm 0.19kPa 24135m 1.9m/s 1.9m/s
02:00 ☾
32% 0.1°C 0mm 68% 0cm -18° 5.5°C 0mm 0.29kPa 24135m 1.7m/s 1.5m/s
03:00 ☾
46% 0.8°C 0mm 61% 0cm -16° 7.9°C 0mm 0.41kPa 24135m 1.5m/s 0.99m/s
04:00 ☾
45% 0.7°C 0mm 55% 0cm -12° 9.3°C 0mm 0.53kPa 24135m 1.9m/s 1.3m/s
05:00 ☾
45% 0.3°C 0mm 49% 0cm -5.5° 11°C 0mm 0.66kPa 24135m 2.3m/s 1.7m/s
06:00
44% -0.3°C 0mm 42% 0cm 2.2° 12°C 0mm 0.82kPa 24135m 2.6m/s 2m/s
07:00
48% 0.3°C 0mm 42% 0cm 11° 13°C 0mm 0.85kPa 24135m 3.1m/s 2.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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