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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 Spread2.8°C
Visibility24135 (Clear)
Relative Humidity82%
Wind Speed0.7m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Vancouver
fog weather icon
Next opportunity
Dense Fog
Revelstoke
Sat, May 30 · 22:00–24:00 · 2h window
High confidence
73%
🌫️Fog Probability88.6-100%
Dewpoint Spread: 0.2°C
Visibility: 884 (Fog)
Relative Humidity: 99%
Wind Speed: 1.0m/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 79 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Vancouver
Fog Probability
≥ 75.0%
Sat, May 23
22:000%
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%
18:0027%
19:0043%
20:000%
21:000%
22:000%
23:000%
Wed, May 27
24:000%
01:000%
02:0069%
03:0067%
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 24 Sunrise 04:51 Sunset 20:48
06:00
1% 3.6°C 0mm 82% 0cm 8.7° 6.4°C 0mm 0.17kPa 24135m 0.9m/s 0.71m/s
07:00
1% 3°C 0mm 70% 0cm 18° 8°C 0mm 0.32kPa 24135m 1.8m/s 1.2m/s
08:00
2% 2.3°C 0mm 56% 0cm 27° 11°C 0mm 0.56kPa 24134m 2.2m/s 1.4m/s
09:00
1% 2.2°C 0mm 50% 0cm 36° 12°C 0mm 0.73kPa 24134m 2.2m/s 1.6m/s
10:00
1% 2.3°C 0mm 46% 0cm 45° 14°C 0mm 0.85kPa 24134m 2.5m/s 1.7m/s
11:00
0% 1.8°C 0mm 45% 0cm 53° 13°C 0mm 0.84kPa 24134m 3.4m/s 1.9m/s
12:00
0% 1°C 0mm 41% 0cm 58° 14°C 0mm 0.94kPa 24135m 4.1m/s 1.7m/s
13:00
0% 0.2°C 0mm 36% 0cm 60° 15°C 0mm 1.1kPa 24134m 4.7m/s 1.6m/s
14:00
0% 0.2°C 0mm 34% 0cm 57° 16°C 0mm 1.2kPa 24135m 5.9m/s 2.4m/s
15:00
0% -0.5°C 0mm 32% 0cm 51° 16°C 0mm 1.3kPa 24134m 6.2m/s 2.3m/s
16:00
0% -0.4°C 0mm 33% 0cm 42° 16°C 0mm 1.2kPa 24135m 5m/s 1.7m/s
17:00 ☾
0% 0.2°C 0mm 32% 0cm 33° 17°C 0mm 1.3kPa 24135m 5.1m/s 1m/s
18:00 ☾
0% 0.4°C 0mm 34% 0cm 24° 16°C 0mm 1.2kPa 24135m 5.3m/s 0.55m/s
19:00 ☾
0% 3.4°C 0mm 44% 0cm 15° 16°C 0mm 1kPa 24135m 1m/s 0.68m/s
20:00 ☾
0% 3.5°C 0mm 53% 0cm 5.9° 13°C 0mm 0.69kPa 24135m 0.63m/s 0.66m/s
21:00 ☾
0% 2.7°C 0mm 60% 0cm -2.1° 10°C 0mm 0.5kPa 24134m 1.3m/s 1.4m/s
22:00 ☾
0% 2.6°C 0mm 62% 0cm -8.9° 9.5°C 0mm 0.45kPa 24134m 1.2m/s 1.3m/s
23:00 ☾
0% 2.4°C 0mm 63% 0cm -14° 9.2°C 0mm 0.43kPa 24134m 0.6m/s 0.58m/s
Mon, May 25 Sunrise 04:50 Sunset 20:49
24:00 ☾
0% 2.6°C 0.01mm 61% 0cm -17° 9.7°C 0mm 0.47kPa 24135m 1.1m/s 1.2m/s
01:00 ☾
0% 3.2°C 0.11mm 64% 0cm -18° 9.8°C 0.06mm 0.44kPa 24134m 0.6m/s 0.23m/s
02:00 ☾
0% 3.7°C 0.07mm 67% 0cm -16° 9.6°C 0.13mm 0.4kPa 24135m 1.6m/s 1.9m/s
03:00 ☾
0% 4.2°C 0mm 72% 0cm -12° 9.1°C 0.13mm 0.33kPa 24135m 1.4m/s 1.5m/s
04:00 ☾
0% 4.4°C 0mm 76% 0cm -6.7° 8.4°C 0.13mm 0.26kPa 24134m 2.1m/s 1.8m/s
05:00
0% 4.2°C 0mm 78% 0cm 0.87° 7.9°C 0.13mm 0.24kPa 24135m 0.9m/s 0.79m/s
06:00
1% 4.8°C 0.04mm 76% 0cm 8.8° 8.9°C 0.06mm 0.28kPa 24134m 0.52m/s 0.35m/s
07:00
3% 5.2°C 0.08mm 75% 0cm 18° 9.4°C 0.13mm 0.29kPa 24134m 1.2m/s 0.94m/s
08:00
4% 5.6°C 0.15mm 69% 0cm 27° 11°C 0.19mm 0.41kPa 24134m 0.91m/s 0.65m/s
09:00
4% 7°C 0.53mm 77% 0cm 37° 11°C 0.63mm 0.3kPa 11243m 2.4m/s 1.7m/s
10:00
3% 6.9°C 0.15mm 75% 0cm 45° 11°C 1.4mm 0.33kPa 24135m 2.1m/s 1.2m/s
11:00
3% 6.5°C 0mm 62% 0cm 53° 14°C 1.4mm 0.6kPa 24134m 0.7m/s 0.78m/s
12:00
2% 6.6°C 0mm 52% 0cm 59° 17°C 0.25mm 0.91kPa 21968m 2.1m/s 0.93m/s
13:00
1% 6.1°C 0.01mm 55% 0cm 60° 15°C 0.63mm 0.76kPa 14072m 3m/s 1.5m/s
14:00
0% 6.1°C 0mm 51% 0cm 57° 16°C 0.81mm 0.9kPa 23109m 2.6m/s 0.82m/s
15:00
0% 3.4°C 0mm 38% 0cm 51° 18°C 0.94mm 1.3kPa 24134m 6.6m/s 0.66m/s
16:00
0% 0.2°C 0mm 29% 0cm 43° 18°C 1mm 1.5kPa 24134m 9m/s 1.9m/s
17:00 ☾
0% 0.1°C 0mm 29% 0cm 33° 18°C 1mm 1.5kPa 24135m 7.7m/s 2.3m/s
18:00 ☾
0% 2°C 0mm 36% 0cm 24° 17°C 0mm 1.3kPa 24134m 6.6m/s 1.7m/s
19:00 ☾
0% 5.2°C 0mm 48% 0cm 15° 16°C 0mm 0.94kPa 24135m 1.2m/s 0.94m/s
20:00 ☾
0% 5.4°C 0mm 61% 0cm 6° 13°C 0mm 0.57kPa 24134m 1m/s 1.2m/s
21:00 ☾
0% 4.7°C 0mm 72% 0cm -1.9° 9.6°C 0mm 0.34kPa 24134m 1.1m/s 1.2m/s
22:00 ☾
0% 4.9°C 0mm 68% 0cm -8.8° 11°C 0mm 0.4kPa 24134m 0.61m/s 0.43m/s
23:00 ☾
0% 5.9°C 1.1mm 81% 0cm -14° 9°C 0.63mm 0.22kPa 12672m 1.9m/s 1.8m/s
Tue, May 26 Sunrise 04:49 Sunset 20:51
24:00 ☾
0% 6.6°C 0mm 87% 0cm -17° 8.6°C 0.19mm 0.14kPa 24134m 2.4m/s 1.9m/s
01:00 ☾
1% 7.2°C 0.16mm 93% 0cm -18° 8.3°C 0.56mm 0.08kPa 22771m 3.2m/s 2.2m/s
02:00 ☾
1% 7.3°C 0.1mm 94% 0cm -16° 8.2°C 0.69mm 0.07kPa 22199m 3.4m/s 2.5m/s
03:00 ☾
1% 7.2°C 0.01mm 96% 0cm -12° 7.9°C 1.3mm 0.05kPa 22901m 2.6m/s 1.7m/s
04:00 ☾
0% 6.7°C 0.75mm 96% 0cm -6.6° 7.2°C 1.8mm 0.04kPa 13983m 2.9m/s 1.8m/s
05:00
0% 6.3°C 0.85mm 96% 0cm 0.99° 6.9°C 2mm 0.04kPa 21115m 2.8m/s 2m/s
06:00
0% 5.8°C 0.17mm 95% 0cm 9° 6.6°C 0.75mm 0.05kPa 24072m 1.9m/s 1.2m/s
07:00
0% 5.7°C 0.04mm 93% 0cm 18° 6.7°C 0.75mm 0.07kPa 24135m 2.1m/s 1.3m/s
08:00
0% 5.7°C 0.22mm 91% 0cm 27° 7.2°C 0.81mm 0.1kPa 22584m 1.7m/s 1.4m/s
09:00
0% 6°C 0.35mm 94% 0cm 37° 6.9°C 1.6mm 0.06kPa 23657m 2.1m/s 1.5m/s
10:00
0% 5.8°C 0mm 87% 0cm 46° 7.8°C 1.6mm 0.14kPa 24135m 1.8m/s 1.3m/s
11:00
0% 5.9°C 0.29mm 84% 0cm 53° 8.3°C 1.7mm 0.17kPa 22520m 1.2m/s 1.1m/s
12:00
0% 6.5°C 0.19mm 83% 0cm 59° 9.3°C 1.1mm 0.2kPa 23058m 1.4m/s 1.2m/s
13:00
0% 7.1°C 0.1mm 81% 0cm 60° 10°C 0.56mm 0.23kPa 23597m 1.7m/s 1.4m/s
14:00
0% 7.8°C 0mm 80% 0cm 57° 11°C 0mm 0.27kPa 24135m 1.9m/s 1.6m/s
15:00
0% 7.7°C 0mm 84% 0cm 51° 10°C 0mm 0.19kPa 24135m 2.1m/s 1.7m/s
16:00
0% 7.5°C 0mm 89% 0cm 43° 9.2°C 0mm 0.13kPa 24135m 2.2m/s 1.8m/s
17:00 ☾
0% 7.3°C 0mm 94% 0cm 34° 8.3°C 0mm 0.07kPa 24135m 2.4m/s 1.9m/s
18:00 ☾
1% 7.4°C 0.27mm 96% 0cm 24° 8.1°C 0.44mm 0.05kPa 16371m 2m/s 1.6m/s
19:00 ☾
2% 7.4°C 0.55mm 97% 0cm 15° 7.9°C 0.88mm 0.03kPa 8608m 1.7m/s 1.4m/s
20:00 ☾
3% 7.5°C 0.82mm 99% 0cm 6.2° 7.6°C 1.3mm 0.01kPa 844m 1.3m/s 1.1m/s
21:00 ☾
3% 7.5°C 0.62mm 99% 0cm -1.7° 7.7°C 2.5mm 0.01kPa 784m 1.4m/s 1.1m/s
22:00 ☾
4% 7.5°C 0.41mm 99% 0cm -8.6° 7.7°C 3.7mm 0.01kPa 724m 1.4m/s 1.1m/s
23:00 ☾
4% 7.6°C 0.21mm 99% 0cm -14° 7.7°C 4.9mm 0.01kPa 664m 1.4m/s 1.2m/s
Wed, May 27 Sunrise 04:48 Sunset 20:52
24:00 ☾
5% 7.7°C 0.14mm 98% 0cm -17° 8°C 3.3mm 0.02kPa 786m 1.5m/s 1.2m/s
01:00 ☾
6% 7.8°C 0.08mm 97% 0cm -18° 8.3°C 1.7mm 0.03kPa 908m 1.6m/s 1.3m/s
02:00 ☾
7% 7.9°C 0.01mm 96% 0cm -16° 8.5°C 0.13mm 0.04kPa 1030m 1.7m/s 1.4m/s
03:00 ☾
6% 8°C 0.01mm 95% 0cm -12° 8.8°C 0.13mm 0.06kPa 3004m 1.7m/s 1.5m/s
04:00 ☾
5% 8.1°C 0.01mm 94% 0cm -6.4° 9°C 0.13mm 0.07kPa 4978m 1.7m/s 1.6m/s
05:00
4% 8.2°C 0.01mm 93% 0cm 1.1° 9.3°C 0.13mm 0.08kPa 6952m 1.7m/s 1.7m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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