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Rule Fog Hunter

Revelstoke - Fog Hunter - Canadian Rockies

Revelstoke, British Columbia, Canada

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread11.7°C
Visibility24134 (Clear)
Relative Humidity43%
Wind Speed1.7m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Vancouver
fog weather icon
Next opportunity
Moderate Fog
Revelstoke
Sun, Apr 12 · 16:00–18:00 · 2h window
Low confidence
39%
🌫️Fog Probability68.8-80.1%
Dewpoint Spread: 0.3°C
Visibility: 6541 (Moderate)
Relative Humidity: 98%
Wind Speed: 0.9m/s (calm conditions)

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 92 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Vancouver
Fog Probability
≥ 60.0%
Tue, Apr 7
21:000%
22:000%
23:000%
Wed, Apr 8
24:000%
01:000%
02:000%
03:000%
04:000%
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06:000%
07:000%
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23:000%
Thu, Apr 9
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
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Fri, Apr 10
24:000%
01:000%
02:000%
03:000%
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06:000%
07:000%
08:000%
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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%
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10:000%
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12:000%
13:000%
14:000%
15:000%
16:000%
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
Wed, Apr 8 Sunrise 06:10 Sunset 19:37
18:00 ☾
30% -5.2°C 0mm 43% 0cm 14° 6.5°C 0mm 0.55kPa 24134m 3.4m/s 1.7m/s
19:00 ☾
49% -3°C 0mm 63% 0cm 5.1° 3.5°C 0mm 0.29kPa 24135m 1.3m/s 1.5m/s
20:00 ☾
67% -3.9°C 0mm 72% 0cm -4.2° 0.41°C 0mm 0.17kPa 24135m 1.1m/s 1.1m/s
21:00 ☾
72% -4.4°C 0mm 77% 0cm -13° -0.79°C 0mm 0.13kPa 24135m 1m/s 0.91m/s
22:00 ☾
76% -4.7°C 0mm 80% 0cm -20° -1.7°C 0mm 0.11kPa 24134m 1.1m/s 0.96m/s
23:00 ☾
81% -4.9°C 0mm 81% 0cm -26° -2°C 0mm 0.1kPa 24134m 1m/s 0.97m/s
Thu, Apr 9 Sunrise 06:10 Sunset 19:37
24:00 ☾
86% -5°C 0mm 81% 0cm -30° -2.2°C 0mm 0.1kPa 24134m 1m/s 0.88m/s
01:00 ☾
92% -5°C 0mm 82% 0cm -31° -2.4°C 0mm 0.09kPa 24135m 0.9m/s 0.81m/s
02:00 ☾
97% -5.1°C 0mm 82% 0cm -30° -2.5°C 0mm 0.09kPa 24134m 0.9m/s 0.77m/s
03:00 ☾
97% -5.2°C 0mm 82% 0cm -25° -2.6°C 0mm 0.09kPa 24135m 0.8m/s 0.68m/s
04:00 ☾
98% -5.3°C 0mm 82% 0cm -19° -2.7°C 0mm 0.09kPa 24135m 0.7m/s 0.61m/s
05:00 ☾
98% -5.2°C 0mm 82% 0cm -11° -2.6°C 0mm 0.09kPa 24135m 0.8m/s 0.63m/s
06:00 ☾
97% -5.3°C 0mm 83% 0cm -2.3° -2.7°C 0mm 0.09kPa 24135m 0.73m/s 0.59m/s
07:00 ☾
95% -5.1°C 0mm 77% 0cm 7° -1.5°C 0mm 0.13kPa 24134m 0.61m/s 0.39m/s
08:00 ☾
94% -4.8°C 0mm 64% 0cm 16° 1.3°C 0mm 0.24kPa 24135m 0.5m/s 0.31m/s
09:00 ☾
95% -4.4°C 0mm 54% 0cm 25° 3.9°C 0mm 0.37kPa 24134m 0.41m/s 0.17m/s
10:00 ☾
96% -4.4°C 0mm 47% 0cm 34° 6.1°C 0mm 0.5kPa 24134m 0.8m/s 0.44m/s
11:00 ☾
97% -4.6°C 0mm 41% 0cm 41° 7.8°C 0mm 0.63kPa 24135m 1m/s 0.69m/s
12:00 ☾
94% -4.7°C 0mm 37% 0cm 45° 9.1°C 0mm 0.72kPa 24135m 1.2m/s 0.66m/s
13:00 ☾
92% -4.6°C 0mm 36% 0cm 47° 9.8°C 0mm 0.77kPa 24134m 1.4m/s 0.79m/s
14:00 ☾
89% -4.6°C 0mm 35% 0cm 45° 10°C 0mm 0.81kPa 24134m 1.5m/s 0.75m/s
15:00 ☾
89% -4.5°C 0mm 34% 0cm 40° 11°C 0mm 0.84kPa 24135m 1.4m/s 0.76m/s
16:00 ☾
90% -4.7°C 0mm 34% 0cm 32° 10°C 0mm 0.83kPa 24134m 1.4m/s 0.66m/s
17:00 ☾
90% -4.9°C 0mm 35% 0cm 24° 9.8°C 0mm 0.79kPa 24135m 1.4m/s 0.57m/s
18:00 ☾
93% -3.9°C 0mm 40% 0cm 15° 9°C 0mm 0.68kPa 24134m 1.1m/s 0.73m/s
19:00 ☾
97% -2.8°C 0mm 52% 0cm 5.4° 6.4°C 0mm 0.46kPa 24134m 0.9m/s 1m/s
20:00 ☾
100% -3.4°C 0mm 60% 0cm -3.9° 3.5°C 0mm 0.31kPa 24135m 1m/s 1.1m/s
21:00 ☾
99% -3.5°C 0mm 66% 0cm -13° 2.2°C 0mm 0.25kPa 24134m 1.1m/s 1.1m/s
22:00 ☾
98% -3.6°C 0mm 69% 0cm -20° 1.4°C 0mm 0.21kPa 24134m 1m/s 0.98m/s
23:00 ☾
97% -3.8°C 0mm 71% 0cm -26° 0.79°C 0mm 0.19kPa 24135m 1m/s 1m/s
Fri, Apr 10 Sunrise 06:08 Sunset 19:38
24:00 ☾
88% -3.9°C 0mm 73% 0cm -30° 0.44°C 0mm 0.17kPa 24134m 1m/s 1m/s
01:00 ☾
78% -4.1°C 0mm 74% 0cm -31° 0.04°C 0mm 0.16kPa 24134m 0.91m/s 0.83m/s
02:00 ☾
69% -4.3°C 0mm 75% 0cm -29° -0.42°C 0mm 0.15kPa 24135m 1m/s 0.91m/s
03:00 ☾
66% -4.5°C 0mm 76% 0cm -25° -0.78°C 0mm 0.14kPa 24135m 0.9m/s 0.78m/s
04:00 ☾
64% -4.6°C 0mm 76% 0cm -19° -0.86°C 0mm 0.14kPa 24134m 0.8m/s 0.7m/s
05:00 ☾
61% -4.7°C 0mm 76% 0cm -11° -0.93°C 0mm 0.14kPa 24134m 0.8m/s 0.7m/s
06:00 ☾
52% -4.9°C 0mm 75% 0cm -1.9° -1°C 0mm 0.14kPa 24134m 0.82m/s 0.75m/s
07:00 ☾
43% -4.7°C 0mm 70% 0cm 7.3° 0.11°C 0mm 0.18kPa 24134m 0.8m/s 0.76m/s
08:00 ☾
34% -4.5°C 0mm 58% 0cm 17° 2.8°C 0mm 0.31kPa 24134m 1.5m/s 0.89m/s
09:00 ☾
33% -4.6°C 0mm 49% 0cm 26° 5.4°C 0mm 0.46kPa 24134m 1.6m/s 0.96m/s
10:00 ☾
31% -4.5°C 0mm 40% 0cm 34° 8.4°C 0mm 0.66kPa 24135m 1.8m/s 1.1m/s
11:00 ☾
30% -4.7°C 0mm 35% 0cm 41° 10°C 0mm 0.81kPa 24135m 1.8m/s 1.3m/s
12:00 ☾
34% -4.6°C 0mm 32% 0cm 46° 12°C 0mm 0.94kPa 24135m 1.7m/s 1.3m/s
13:00 ☾
38% -4.4°C 0mm 30% 0cm 47° 13°C 0mm 1.1kPa 24134m 1.4m/s 1.2m/s
14:00 ☾
42% -4.3°C 0mm 29% 0cm 45° 14°C 0mm 1.1kPa 24135m 1.6m/s 1.3m/s
15:00 ☾
42% -4.1°C 0mm 28% 0cm 40° 14°C 0mm 1.1kPa 24134m 1.8m/s 1.2m/s
16:00 ☾
41% -3.9°C 0mm 29% 0cm 33° 14°C 0mm 1.1kPa 24135m 2m/s 1.2m/s
17:00 ☾
41% -3.8°C 0mm 30% 0cm 24° 13°C 0mm 1.1kPa 24134m 1.6m/s 1.2m/s
18:00 ☾
37% -2.5°C 0mm 35% 0cm 15° 12°C 0mm 0.93kPa 24134m 1.4m/s 1.2m/s
19:00 ☾
33% -1.9°C 0mm 45% 0cm 5.6° 9.6°C 0mm 0.66kPa 24134m 1.1m/s 1.2m/s
20:00 ☾
29% -2.3°C 0mm 50% 0cm -3.6° 7.6°C 0mm 0.52kPa 24135m 1.1m/s 1.1m/s
21:00 ☾
26% -2.2°C 0mm 55% 0cm -12° 6.1°C 0mm 0.42kPa 24135m 1.2m/s 1.2m/s
22:00 ☾
22% -2.2°C 0mm 60% 0cm -20° 5°C 0mm 0.35kPa 24135m 1.1m/s 1.2m/s
23:00 ☾
19% -2.3°C 0mm 63% 0cm -26° 4°C 0mm 0.3kPa 24135m 1.2m/s 1.2m/s
Sat, Apr 11 Sunrise 06:06 Sunset 19:40
24:00 ☾
13% -2.1°C 0mm 63% 0cm -30° 4.4°C 0mm 0.31kPa 24135m 1.3m/s 1.1m/s
01:00 ☾
7% -1.9°C 0mm 62% 0cm -31° 4.7°C 0mm 0.32kPa 24135m 1.4m/s 1.1m/s
02:00 ☾
1% -1.7°C 0mm 61% 0cm -29° 5.1°C 0mm 0.34kPa 24135m 1.4m/s 1.1m/s
03:00 ☾
1% -1.5°C 0mm 56% 0cm -25° 6.8°C 0mm 0.44kPa 24135m 1.3m/s 1.1m/s
04:00 ☾
0% -1.4°C 0mm 50% 0cm -18° 8.5°C 0mm 0.56kPa 24135m 1.1m/s 1.2m/s
05:00 ☾
0% -1.6°C 0mm 44% 0cm -10° 10°C 0mm 0.7kPa 24135m 0.91m/s 1.2m/s
06:00 ☾
0% -1.5°C 0mm 42% 0cm -1.6° 11°C 0mm 0.77kPa 24135m 0.85m/s 1.2m/s
07:00 ☾
0% -1.6°C 0mm 39% 0cm 7.7° 12°C 0mm 0.84kPa 24135m 0.8m/s 1.2m/s
08:00 ☾
0% -1.7°C 0mm 37% 0cm 17° 13°C 0mm 0.93kPa 24135m 0.74m/s 1.1m/s
09:00 ☾
0% -1.8°C 0mm 37% 0cm 26° 12°C 0mm 0.9kPa 24135m 0.83m/s 1.1m/s
10:00 ☾
0% -2°C 0mm 37% 0cm 35° 12°C 0mm 0.88kPa 24135m 0.92m/s 1.1m/s
11:00 ☾
0% -2.2°C 0mm 38% 0cm 42° 12°C 0mm 0.86kPa 24135m 1m/s 1.1m/s
12:00 ☾
0% -0.9°C 0mm 45% 0cm 46° 11°C 0mm 0.71kPa 24135m 1m/s 1.1m/s
13:00 ☾
1% 0.1°C 0mm 52% 0cm 48° 9.5°C 0mm 0.57kPa 24135m 1m/s 1.1m/s
14:00 ☾
1% 0.7°C 0mm 59% 0cm 45° 8.3°C 0mm 0.45kPa 24135m 1m/s 1.1m/s
15:00 ☾
1% 0.7°C 0mm 61% 0cm 40° 7.8°C 0mm 0.41kPa 24135m 0.94m/s 0.97m/s
16:00 ☾
1% 0.7°C 0mm 63% 0cm 33° 7.3°C 0mm 0.38kPa 24135m 0.85m/s 0.88m/s
17:00 ☾
1% 0.7°C 0mm 65% 0cm 24° 6.8°C 0mm 0.35kPa 24135m 0.76m/s 0.79m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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