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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 Spread2.1°C
Visibility24135 (Clear)
Relative Humidity86%
Wind Speed3.4m/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 79 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 75.0%
Sat, May 23
23:000%
Sun, May 24
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%
Mon, May 25
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 26
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 27
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
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
Sun, May 24 Sunrise 05:35 Sunset 21:34
07:00
1% 4.1°C 0mm 86% 0cm 11° 6.2°C 0mm 0.13kPa 24135m 7.8m/s 3.4m/s
08:00
2% 3.5°C 0mm 76% 0cm 20° 7.5°C 0mm 0.25kPa 24135m 4.2m/s 2.7m/s
09:00
3% 3.2°C 0mm 68% 0cm 29° 8.9°C 0mm 0.37kPa 24134m 2.2m/s 1.7m/s
10:00
2% 3.6°C 0mm 62% 0cm 39° 10°C 0mm 0.47kPa 24134m 0.91m/s 0.98m/s
11:00
1% 4.1°C 0mm 60% 0cm 47° 12°C 0mm 0.55kPa 24134m 1m/s 1.4m/s
12:00
0% 4.3°C 0mm 59% 0cm 54° 12°C 0mm 0.59kPa 24134m 1.4m/s 1.9m/s
13:00
0% 4.7°C 0mm 56% 0cm 59° 13°C 0mm 0.66kPa 24135m 1.8m/s 2.4m/s
14:00
0% 5.4°C 0mm 54% 0cm 59° 15°C 0mm 0.76kPa 24134m 2.9m/s 2.9m/s
15:00
0% 6.1°C 0mm 52% 0cm 55° 16°C 0mm 0.85kPa 24135m 3.6m/s 3.4m/s
16:00
0% 6.3°C 0mm 51% 0cm 49° 16°C 0mm 0.91kPa 24134m 4.8m/s 4.5m/s
17:00
0% 6.3°C 0mm 48% 0cm 40° 17°C 0mm 1kPa 24135m 5.2m/s 4.5m/s
18:00 ☾
0% 5.6°C 0mm 45% 0cm 31° 18°C 0mm 1.1kPa 24135m 5.9m/s 4.2m/s
19:00 ☾
0% 6.6°C 0mm 48% 0cm 22° 18°C 0mm 1.1kPa 24135m 5.9m/s 3.1m/s
20:00 ☾
0% 7.9°C 0mm 58% 0cm 12° 16°C 0mm 0.78kPa 24135m 4.7m/s 3.1m/s
21:00 ☾
0% 6.4°C 0mm 62% 0cm 4° 13°C 0mm 0.58kPa 24135m 2.6m/s 2.7m/s
22:00 ☾
0% 4.7°C 0mm 63% 0cm -3.8° 12°C 0mm 0.51kPa 24134m 1.6m/s 1.6m/s
23:00 ☾
0% 4.2°C 0mm 65% 0cm -10° 11°C 0mm 0.45kPa 24134m 1.4m/s 1.4m/s
Mon, May 25 Sunrise 05:34 Sunset 21:35
24:00 ☾
0% 3.9°C 0mm 66% 0cm -15° 9.9°C 0mm 0.41kPa 24134m 0.6m/s 0.64m/s
01:00 ☾
2% 3.3°C 0mm 64% 0cm -17° 9.7°C 0mm 0.43kPa 24135m 2m/s 2.1m/s
02:00 ☾
3% 2.9°C 0mm 64% 0cm -18° 9.4°C 0mm 0.42kPa 24134m 1.9m/s 1.9m/s
03:00 ☾
5% 2.8°C 0mm 70% 0cm -15° 7.9°C 0mm 0.32kPa 24135m 1.4m/s 1.5m/s
04:00 ☾
7% 2.5°C 0mm 71% 0cm -11° 7.5°C 0mm 0.3kPa 24135m 1.3m/s 1.4m/s
05:00 ☾
10% 1.7°C 0mm 68% 0cm -4.9° 7.3°C 0mm 0.33kPa 24134m 1.9m/s 2.1m/s
06:00
12% 1.2°C 0mm 67% 0cm 2.8° 6.9°C 0mm 0.33kPa 24135m 2.2m/s 2.3m/s
07:00
22% 2.8°C 0mm 68% 0cm 11° 8.3°C 0mm 0.34kPa 24134m 3.4m/s 2.4m/s
08:00
32% 4.3°C 0mm 64% 0cm 20° 11°C 0mm 0.46kPa 24134m 4.2m/s 2.4m/s
09:00
42% 5.4°C 0mm 60% 0cm 29° 13°C 0mm 0.6kPa 24134m 4.8m/s 2.7m/s
10:00
42% 6.3°C 0mm 55% 0cm 39° 15°C 0mm 0.77kPa 24134m 4m/s 2.7m/s
11:00
42% 6.8°C 0mm 50% 0cm 47° 17°C 0mm 1kPa 24135m 4.1m/s 3m/s
12:00
42% 5.5°C 0mm 40% 0cm 55° 20°C 0mm 1.4kPa 24134m 4.9m/s 2.8m/s
13:00
46% 5°C 0mm 35% 0cm 59° 21°C 0mm 1.6kPa 24135m 7.7m/s 3.1m/s
14:00
50% 4.7°C 0mm 32% 0cm 59° 22°C 0mm 1.8kPa 24134m 6.4m/s 3m/s
15:00
54% 3°C 0mm 28% 0cm 56° 22°C 0mm 1.9kPa 24135m 7m/s 4.5m/s
16:00
51% 2.4°C 0mm 27% 0cm 49° 22°C 0mm 2kPa 24134m 8.4m/s 4.7m/s
17:00
48% 2.5°C 0mm 27% 0cm 40° 22°C 0mm 2kPa 24134m 7.1m/s 4.2m/s
18:00 ☾
45% 5.1°C 0mm 33% 0cm 31° 22°C 0mm 1.8kPa 24135m 5.4m/s 4m/s
19:00 ☾
36% 7°C 0mm 47% 0cm 22° 19°C 0mm 1.1kPa 24134m 8.5m/s 3.8m/s
20:00 ☾
26% 5.4°C 0mm 47% 0cm 13° 17°C 0mm 1kPa 24135m 7.3m/s 3.7m/s
21:00 ☾
17% 3°C 0mm 44% 0cm 4.1° 15°C 0mm 0.98kPa 24134m 3.2m/s 3.2m/s
22:00 ☾
14% 0°C 0mm 38% 0cm -3.6° 14°C 0mm 1kPa 24134m 2.8m/s 2.8m/s
23:00 ☾
12% 0.2°C 0mm 41% 0cm -10° 13°C 0mm 0.88kPa 24134m 2.6m/s 2.7m/s
Tue, May 26 Sunrise 05:33 Sunset 21:37
24:00 ☾
9% 0°C 0mm 43% 0cm -15° 12°C 0mm 0.81kPa 24135m 1.1m/s 1.2m/s
01:00 ☾
8% -0.3°C 0mm 43% 0cm -17° 12°C 0mm 0.79kPa 24134m 1.8m/s 1.9m/s
02:00 ☾
8% -0.2°C 0mm 45% 0cm -17° 11°C 0mm 0.74kPa 24135m 1.2m/s 1.2m/s
03:00 ☾
7% -0.1°C 0mm 44% 0cm -15° 12°C 0mm 0.78kPa 24134m 1.3m/s 1.4m/s
04:00 ☾
5% 0°C 0mm 47% 0cm -11° 11°C 0mm 0.69kPa 24135m 2.1m/s 2.4m/s
05:00 ☾
4% 0.1°C 0mm 49% 0cm -4.8° 10°C 0mm 0.65kPa 24134m 2.8m/s 2.9m/s
06:00
2% 1.6°C 0mm 51% 0cm 2.9° 11°C 0mm 0.66kPa 24134m 2.7m/s 2.7m/s
07:00
2% 4.8°C 0mm 61% 0cm 11° 12°C 0mm 0.54kPa 24134m 2.5m/s 2m/s
08:00
1% 5.9°C 0mm 59% 0cm 20° 14°C 0mm 0.65kPa 24135m 2.3m/s 1.9m/s
09:00
1% 6.4°C 0mm 56% 0cm 30° 15°C 0mm 0.77kPa 24135m 2.4m/s 2m/s
10:00
2% 6.4°C 0mm 49% 0cm 39° 17°C 0mm 0.99kPa 24134m 3.6m/s 3.1m/s
11:00
2% 6.7°C 0mm 47% 0cm 48° 18°C 0mm 1.1kPa 24135m 3.3m/s 3.6m/s
12:00
3% 7.8°C 0mm 48% 0cm 55° 19°C 0mm 1.1kPa 24134m 3.7m/s 4.3m/s
13:00
12% 9.3°C 0mm 58% 0cm 59° 18°C 0.15mm 0.86kPa 24134m 4.2m/s 3.8m/s
14:00
20% 10°C 0mm 67% 0cm 60° 17°C 0.29mm 0.63kPa 24135m 4.7m/s 3.3m/s
15:00
29% 11°C 0mm 76% 0cm 56° 15°C 0.44mm 0.42kPa 24135m 5.2m/s 2.8m/s
16:00
26% 11°C 0mm 81% 0cm 49° 14°C 0.71mm 0.31kPa 24135m 8.5m/s 4m/s
17:00
22% 11°C 0mm 86% 0cm 40° 13°C 0.98mm 0.21kPa 24135m 12m/s 5.3m/s
18:00 ☾
19% 11°C 0mm 91% 0cm 31° 12°C 1.3mm 0.13kPa 24135m 15m/s 6.5m/s
19:00 ☾
13% 10°C 0.01mm 90% 0cm 22° 12°C 1mm 0.15kPa 24135m 14m/s 5.9m/s
20:00 ☾
7% 10°C 0.03mm 88% 0cm 13° 12°C 0.75mm 0.16kPa 24135m 13m/s 5.4m/s
21:00 ☾
1% 10°C 0.04mm 87% 0cm 4.3° 12°C 0.5mm 0.18kPa 24135m 12m/s 4.8m/s
22:00 ☾
1% 9.9°C 0.03mm 88% 0cm -3.5° 12°C 0.56mm 0.17kPa 24135m 12m/s 4.5m/s
23:00 ☾
0% 9.8°C 0.02mm 88% 0cm -9.9° 12°C 0.63mm 0.17kPa 24135m 11m/s 4.2m/s
Wed, May 27 Sunrise 05:32 Sunset 21:38
24:00 ☾
0% 9.7°C 0.01mm 88% 0cm -15° 12°C 0.69mm 0.17kPa 24135m 10m/s 3.9m/s
01:00 ☾
1% 9.7°C 0.05mm 88% 0cm -17° 12°C 0.54mm 0.16kPa 24135m 10m/s 3.7m/s
02:00 ☾
2% 9.8°C 0.09mm 89% 0cm -17° 12°C 0.4mm 0.15kPa 24135m 9.7m/s 3.6m/s
03:00 ☾
3% 9.8°C 0.13mm 89% 0cm -15° 12°C 0.25mm 0.15kPa 24135m 9.3m/s 3.4m/s
04:00 ☾
2% 9.9°C 0.09mm 89% 0cm -11° 12°C 0.25mm 0.16kPa 24135m 9m/s 3.6m/s
05:00 ☾
2% 10°C 0.05mm 88% 0cm -4.6° 12°C 0.25mm 0.17kPa 24135m 8.7m/s 3.7m/s
06:00
1% 10°C 0.01mm 87% 0cm 3° 12°C 0.25mm 0.18kPa 24135m 8.4m/s 3.8m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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