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Rule Fog Hunter

Valemount - Fog Hunter - Canadian Rockies

Valemount, British Columbia, 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
Dewpoint Spread2.1°C
Visibility24135 (Clear)
Relative Humidity86%
Wind Speed1.1m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Vancouver

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 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Vancouver
Fog Probability
≥ 75.0%
Sat, May 16
21:0056%
22:0058%
23:0037%
Sun, May 17
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 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%
03:0037%
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%
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/Vancouver
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 17 Sunrise 04:56 Sunset 20:51
06:00
28% -2.7°C 0mm 86% 0cm 7.8° -0.59°C 0mm 0.08kPa 24135m 1.6m/s 1.1m/s
07:00
42% -2.3°C 0mm 81% 0cm 16° 0.6°C 0mm 0.12kPa 24135m 1.4m/s 0.98m/s
08:00
55% -1.9°C 0mm 75% 0cm 25° 2.2°C 0mm 0.18kPa 24134m 1.5m/s 1.1m/s
09:00
50% -1.5°C 0mm 67% 0cm 34° 4.1°C 0mm 0.27kPa 24134m 1.1m/s 0.83m/s
10:00
46% -1.1°C 0mm 61% 0cm 43° 5.7°C 0mm 0.35kPa 24134m 1m/s 0.67m/s
11:00
41% -1°C 0mm 55% 0cm 50° 7.4°C 0mm 0.46kPa 24135m 1.3m/s 0.53m/s
12:00
45% -1.2°C 0mm 49% 0cm 55° 8.9°C 0.06mm 0.58kPa 21131m 1.8m/s 0.91m/s
13:00
49% -1.6°C 0mm 44% 0cm 57° 10°C 0.19mm 0.68kPa 22203m 2.6m/s 0.85m/s
14:00
53% -2°C 0mm 42% 0cm 54° 10°C 0.44mm 0.73kPa 20743m 2.9m/s 0.89m/s
15:00
55% -1.9°C 0mm 42% 0cm 49° 10°C 0.69mm 0.73kPa 21568m 2.9m/s 1.1m/s
16:00
57% -2°C 0mm 44% 0cm 41° 9.5°C 1.1mm 0.66kPa 21352m 2.6m/s 1.3m/s
17:00
59% -1.6°C 0mm 46% 0cm 32° 9.3°C 1.4mm 0.63kPa 22297m 2.1m/s 1.3m/s
18:00
55% -1°C 0mm 50% 0cm 23° 8.7°C 0.44mm 0.56kPa 18967m 1.9m/s 1.5m/s
19:00
51% -0.3°C 0mm 58% 0cm 15° 7.6°C 0.81mm 0.44kPa 19661m 1.6m/s 1.5m/s
20:00
47% 0.7°C 0mm 71% 0cm 6.1° 5.5°C 1.1mm 0.26kPa 17834m 1.7m/s 1.8m/s
21:00
43% 0.3°C 0mm 82% 0cm -1.7° 3°C 1.3mm 0.13kPa 17493m 1.5m/s 1.6m/s
22:00
40% 0.3°C 0mm 84% 0cm -8.4° 2.8°C 1.5mm 0.12kPa 24134m 1.4m/s 1.4m/s
23:00
36% -0.2°C 0mm 85% 0cm -14° 2.1°C 1.5mm 0.11kPa 24135m 1.3m/s 1.3m/s
Mon, May 18 Sunrise 04:54 Sunset 20:52
24:00
38% -0.9°C 0mm 86% 0cm -17° 1.2°C 0mm 0.09kPa 24134m 1.1m/s 1.1m/s
01:00
40% -1.1°C 0mm 87% 0cm -18° 0.72°C 0mm 0.08kPa 24135m 1.3m/s 1.4m/s
02:00
42% -1.5°C 0mm 89% 0cm -16° 0.14°C 0mm 0.07kPa 24135m 1.3m/s 1.4m/s
03:00
35% -1.8°C 0mm 89% 0cm -13° -0.25°C 0mm 0.07kPa 24134m 1.3m/s 1.3m/s
04:00
29% -1.9°C 0mm 89% 0cm -7° -0.33°C 0mm 0.06kPa 24134m 1.4m/s 1.5m/s
05:00
22% -1.8°C 0mm 89% 0cm 0.34° -0.23°C 0mm 0.07kPa 24134m 1.5m/s 1.6m/s
06:00
16% -1.3°C 0mm 86% 0cm 7.9° 0.75°C 0mm 0.09kPa 24135m 2m/s 1.4m/s
07:00
10% -0.8°C 0mm 80% 0cm 17° 2.4°C 0mm 0.15kPa 24134m 2.1m/s 1.6m/s
08:00
4% -0.1°C 0.01mm 74% 0cm 26° 4.1°C 0mm 0.21kPa 24135m 2.1m/s 1.6m/s
09:00
3% 0.3°C 0mm 67% 0cm 35° 5.9°C 0mm 0.3kPa 24134m 2.3m/s 1.8m/s
10:00
3% 0.2°C 0mm 59% 0cm 43° 7.7°C 0.06mm 0.44kPa 24135m 2.2m/s 1.7m/s
11:00
2% -0.8°C 0.01mm 49% 0cm 50° 9.3°C 0.19mm 0.59kPa 20131m 2.5m/s 2m/s
12:00
1% -1.5°C 0mm 44% 0cm 55° 10°C 0.19mm 0.71kPa 18954m 3.1m/s 2.2m/s
13:00
1% -1.7°C 0mm 42% 0cm 57° 11°C 0.31mm 0.76kPa 19896m 3.5m/s 2.7m/s
14:00
0% -1.2°C 0mm 44% 0cm 54° 11°C 0.5mm 0.71kPa 19173m 3.7m/s 3m/s
15:00
0% -0.6°C 0mm 47% 0cm 49° 10°C 0.69mm 0.66kPa 20258m 3.7m/s 2.8m/s
16:00
0% -0.6°C 0mm 47% 0cm 41° 10°C 0.81mm 0.66kPa 21264m 3.4m/s 2.4m/s
17:00
0% -0.3°C 0mm 49% 0cm 33° 9.9°C 0.94mm 0.62kPa 24134m 3.3m/s 2.8m/s
18:00
0% 0.8°C 0mm 57% 0cm 24° 8.9°C 0.19mm 0.49kPa 24091m 3.2m/s 2.9m/s
19:00
0% 2.4°C 0mm 69% 0cm 15° 7.7°C 0.38mm 0.32kPa 20345m 3.4m/s 2.7m/s
20:00
0% 2.9°C 0mm 79% 0cm 6.3° 6.3°C 0.56mm 0.2kPa 23251m 3.6m/s 2.5m/s
21:00
0% 2.7°C 0mm 85% 0cm -1.4° 5.1°C 0.69mm 0.13kPa 24134m 3.5m/s 2.5m/s
22:00
0% 2.4°C 0mm 90% 0cm -8.2° 4°C 0.75mm 0.09kPa 24135m 3.4m/s 2.4m/s
23:00
0% 2.1°C 0mm 91% 0cm -13° 3.4°C 0.75mm 0.07kPa 24135m 3.1m/s 2.3m/s
Tue, May 19 Sunrise 04:53 Sunset 20:54
24:00
0% 2°C 0.01mm 92% 0cm -16° 3.2°C 0mm 0.07kPa 24134m 2.7m/s 2.1m/s
01:00
0% 2.1°C 0mm 92% 0cm -17° 3.3°C 0mm 0.06kPa 24134m 3m/s 2m/s
02:00
0% 1.9°C 0.06mm 94% 0cm -16° 2.8°C 0mm 0.04kPa 13877m 2.4m/s 1.8m/s
03:00
0% 2°C 0.93mm 96% 0cm -12° 2.6°C 0.5mm 0.03kPa 6434m 2.3m/s 1.6m/s
04:00
0% 2°C 1.5mm 98% 0cm -6.8° 2.4°C 2.1mm 0.02kPa 151m 3.1m/s 1.9m/s
05:00
0% 1.6°C 1.6mm 99% 0cm 0.5° 1.8°C 3.8mm 0.01kPa 46m 2.8m/s 1.9m/s
06:00
1% 1.5°C 1.6mm 99% 1.6cm 8.1° 1.7°C 1.5mm 0.01kPa 39m 2.5m/s 1.6m/s
07:00
1% 1.6°C 1.9mm 99% 0cm 17° 1.8°C 2.9mm 0.01kPa 38m 1.7m/s 0.89m/s
08:00
2% 1.4°C 2.3mm 99% 2.3cm 26° 1.5°C 4.9mm 0kPa 32m 1.6m/s 1m/s
09:00
1% 1.4°C 1.8mm 99% 1.8cm 35° 1.5°C 6.8mm 0kPa 26m 1.8m/s 1.1m/s
10:00
1% 1.6°C 1.2mm 99% 1.2cm 43° 1.7°C 8.4mm 0kPa 29m 1.5m/s 0.68m/s
11:00
0% 2°C 0.32mm 99% 0cm 50° 2.2°C 9.3mm 0.01kPa 34m 0.82m/s 0.25m/s
12:00
0% 1.8°C 0.22mm 90% 0cm 55° 3.2°C 6.3mm 0.08kPa 8068m 1.4m/s 0.84m/s
13:00
0% 1.3°C 0.12mm 81% 0cm 57° 4.3°C 3.3mm 0.16kPa 16101m 1.9m/s 1.4m/s
14:00
0% 0.7°C 0.02mm 72% 0cm 55° 5.3°C 0.25mm 0.25kPa 24135m 2.4m/s 2m/s
15:00
0% 0.2°C 0.01mm 75% 0cm 49° 4.1°C 0.27mm 0.2kPa 24135m 2.1m/s 1.8m/s
16:00
0% -0.5°C 0.007mm 79% 0cm 41° 2.9°C 0.29mm 0.16kPa 24135m 1.8m/s 1.6m/s
17:00
0% -1.1°C 0mm 82% 0cm 33° 1.7°C 0.31mm 0.13kPa 24135m 1.4m/s 1.4m/s
18:00
3% -1.4°C 0mm 82% 0cm 24° 1.3°C 0.21mm 0.12kPa 24135m 1.2m/s 1.2m/s
19:00
7% -1.7°C 0mm 83% 0cm 15° 0.87°C 0.1mm 0.11kPa 24135m 1m/s 1m/s
20:00
10% -2°C 0mm 84% 0cm 6.4° 0.47°C 0mm 0.1kPa 24135m 0.83m/s 0.84m/s
21:00
10% -2.1°C 0mm 85% 0cm -1.2° 0.14°C 0mm 0.09kPa 24135m 0.79m/s 0.79m/s
22:00
10% -2.3°C 0mm 86% 0cm -8° -0.19°C 0mm 0.09kPa 24135m 0.75m/s 0.74m/s
23:00
10% -2.4°C 0mm 87% 0cm -13° -0.52°C 0mm 0.08kPa 24135m 0.72m/s 0.69m/s
Wed, May 20 Sunrise 04:52 Sunset 20:56
24:00
14% -1.7°C 0mm 80% 0cm -16° 1.3°C 0mm 0.13kPa 24135m 0.85m/s 0.81m/s
01:00
19% -1°C 0mm 74% 0cm -17° 3.1°C 0mm 0.2kPa 24135m 0.97m/s 0.94m/s
02:00
23% -0.5°C 0mm 68% 0cm -16° 5°C 0mm 0.28kPa 24135m 1.1m/s 1.1m/s
03:00
21% -0.4°C 0mm 60% 0cm -12° 6.9°C 0mm 0.4kPa 24135m 1.2m/s 0.97m/s
04:00
20% -0.5°C 0mm 52% 0cm -6.7° 8.7°C 0mm 0.54kPa 24135m 1.4m/s 0.88m/s
05:00
18% -0.9°C 0mm 45% 0cm 0.64° 11°C 0mm 0.7kPa 24135m 1.5m/s 0.79m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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