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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 · ≥ 60.0%

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 Spread1.5°C
Visibility24134 (Clear)
Relative Humidity90%
Wind Speed0.9m/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 74 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Vancouver
Fog Probability
≥ 60.0%
Sun, Apr 19
21:000%
22:000%
23:000%
Mon, Apr 20
24:000%
01:000%
02:000%
03:0024%
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, Apr 21
24:000%
01:0024%
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%
22:0024%
23:0024%
Wed, Apr 22
24:0043%
01:0043%
02:0043%
03:0043%
04:0057%
05:0044%
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%
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
Mon, Apr 20 Sunrise 05:47 Sunset 20:05
01:00 ☾
0% 2°C 0.02mm 90% 0cm -26° 3.5°C 0mm 0.08kPa 24134m 1m/s 0.95m/s
02:00 ☾
0% 2°C 0.16mm 91% 0cm -24° 3.2°C 0.06mm 0.07kPa 24135m 0.6m/s 0.64m/s
03:00 ☾
0% 2.2°C 0.23mm 94% 0cm -20° 3.2°C 0.25mm 0.05kPa 24135m 0.5m/s 0.51m/s
04:00 ☾
0% 2.1°C 0.01mm 93% 0cm -14° 3.1°C 0.31mm 0.05kPa 24134m 0.9m/s 0.95m/s
05:00 ☾
0% 1.9°C 0mm 92% 0cm -7.2° 3.1°C 0.31mm 0.06kPa 24135m 1m/s 0.98m/s
06:00
0% 1.7°C 0mm 92% 0cm 1.4° 2.9°C 0mm 0.06kPa 24134m 1.1m/s 1.1m/s
07:00
0% 2°C 0mm 90% 0cm 10° 3.5°C 0mm 0.08kPa 24135m 1.7m/s 1.3m/s
08:00
0% 2.6°C 0mm 87% 0cm 19° 4.6°C 0mm 0.11kPa 24134m 2.3m/s 1.5m/s
09:00
1% 3.4°C 0mm 78% 0cm 28° 7°C 0mm 0.22kPa 24134m 2.6m/s 1.6m/s
10:00
1% 4°C 0mm 68% 0cm 36° 9.6°C 0mm 0.38kPa 23407m 3m/s 1.8m/s
11:00
2% 4.2°C 0mm 61% 0cm 43° 12°C 0.13mm 0.53kPa 19840m 3.6m/s 2.2m/s
12:00
18% 3.8°C 0mm 55% 0cm 47° 12°C 0.31mm 0.64kPa 18178m 4m/s 2.5m/s
13:00
35% 3.7°C 0mm 53% 0cm 49° 13°C 0.63mm 0.7kPa 20978m 4.4m/s 2.6m/s
14:00
51% 3.8°C 0mm 52% 0cm 47° 13°C 0.94mm 0.73kPa 17939m 4.6m/s 2.9m/s
15:00
50% 3.8°C 0mm 54% 0cm 42° 13°C 1.4mm 0.68kPa 15847m 4.1m/s 2.8m/s
16:00
49% 4°C 0mm 55% 0cm 35° 13°C 1.7mm 0.67kPa 13936m 4m/s 2.6m/s
17:00 ☾
48% 4.1°C 0mm 56% 0cm 27° 13°C 2.1mm 0.64kPa 15075m 3.5m/s 2.4m/s
18:00 ☾
42% 4.7°C 0mm 62% 0cm 18° 12°C 0.44mm 0.52kPa 12214m 3.2m/s 2.3m/s
19:00 ☾
35% 5.1°C 0mm 72% 0cm 8.9° 9.9°C 0.94mm 0.33kPa 13082m 3.4m/s 2.4m/s
20:00 ☾
29% 4.6°C 0mm 83% 0cm 0.48° 7.3°C 1.3mm 0.18kPa 12826m 2m/s 2.2m/s
21:00 ☾
24% 4°C 0mm 87% 0cm -8.1° 6°C 1.6mm 0.12kPa 16435m 1.8m/s 1.9m/s
22:00 ☾
18% 3.9°C 0mm 90% 0cm -15° 5.4°C 2.1mm 0.09kPa 9530m 1.6m/s 1.8m/s
23:00 ☾
13% 3.5°C 0mm 90% 0cm -21° 4.9°C 2.5mm 0.08kPa 18287m 0.91m/s 0.97m/s
Tue, Apr 21 Sunrise 05:45 Sunset 20:07
24:00 ☾
9% 3.6°C 0mm 91% 0cm -24° 4.9°C 0.13mm 0.08kPa 24135m 1.5m/s 1.4m/s
01:00 ☾
5% 4°C 0.14mm 94% 0cm -25° 4.9°C 0.56mm 0.05kPa 9804m 1.5m/s 1.5m/s
02:00 ☾
1% 4.5°C 1.2mm 94% 0cm -24° 5.4°C 1.6mm 0.05kPa 9588m 1.6m/s 1.5m/s
03:00 ☾
1% 4.7°C 0.19mm 95% 0cm -20° 5.5°C 2.7mm 0.04kPa 15992m 3.2m/s 2m/s
04:00 ☾
0% 4.1°C 0mm 94% 0cm -14° 5°C 2.8mm 0.05kPa 16893m 1.5m/s 1.5m/s
05:00 ☾
0% 3.7°C 0mm 92% 0cm -6.9° 4.8°C 2.8mm 0.07kPa 16913m 1.1m/s 1.2m/s
06:00
3% 3.2°C 0mm 93% 0cm 1.7° 4.3°C 0mm 0.06kPa 16955m 0.6m/s 0.6m/s
07:00
6% 3.6°C 0mm 90% 0cm 10° 5.1°C 0mm 0.08kPa 24135m 0.4m/s 0.22m/s
08:00
9% 4°C 0mm 86% 0cm 19° 6.1°C 0.06mm 0.13kPa 24134m 0.32m/s 0.15m/s
09:00
9% 4.3°C 0mm 82% 0cm 28° 7.2°C 0.06mm 0.19kPa 24134m 1m/s 0.38m/s
10:00
8% 4.7°C 0mm 76% 0cm 36° 8.7°C 0.06mm 0.27kPa 24134m 1m/s 0.49m/s
11:00
8% 4.6°C 0mm 68% 0cm 43° 10°C 0.06mm 0.41kPa 24134m 1.3m/s 0.55m/s
12:00
6% 3.6°C 0mm 59% 0cm 48° 11°C 0.19mm 0.56kPa 17889m 1.9m/s 0.86m/s
13:00
5% 2.6°C 0mm 54% 0cm 49° 12°C 0.56mm 0.63kPa 15010m 2.3m/s 1.9m/s
14:00
3% 3.4°C 0.31mm 63% 0cm 47° 10°C 1.1mm 0.47kPa 9103m 2.8m/s 2.7m/s
15:00
2% 4.2°C 0.56mm 76% 0cm 42° 8.1°C 1.9mm 0.26kPa 18092m 2.3m/s 1.8m/s
16:00
1% 4.3°C 0.47mm 79% 0cm 35° 7.8°C 2.5mm 0.22kPa 13225m 2.4m/s 2m/s
17:00 ☾
0% 4.3°C 0.61mm 83% 0cm 27° 7.1°C 3.3mm 0.18kPa 13246m 1.5m/s 1.3m/s
18:00 ☾
0% 4.4°C 0.02mm 86% 0cm 18° 6.5°C 0.38mm 0.13kPa 19403m 1.8m/s 1.5m/s
19:00 ☾
0% 4.2°C 0mm 87% 0cm 9.1° 6.3°C 0.44mm 0.13kPa 24135m 2.1m/s 1.6m/s
20:00 ☾
0% 3.9°C 0mm 90% 0cm 0.69° 5.3°C 0.5mm 0.08kPa 24134m 3.3m/s 2.2m/s
21:00 ☾
0% 3.7°C 0mm 92% 0cm -7.8° 4.9°C 0.56mm 0.07kPa 24135m 2.3m/s 1.6m/s
22:00 ☾
0% 3.1°C 0mm 95% 0cm -15° 3.8°C 0.56mm 0.04kPa 22696m 2.9m/s 2m/s
23:00 ☾
0% 3°C 0mm 94% 0cm -20° 3.8°C 0.56mm 0.04kPa 24134m 1.2m/s 1.2m/s
Wed, Apr 22 Sunrise 05:42 Sunset 20:09
24:00 ☾
0% 2.7°C 0mm 94% 0cm -24° 3.5°C 0mm 0.04kPa 24135m 1.1m/s 1m/s
01:00 ☾
0% 2.6°C 0mm 94% 0cm -25° 3.5°C 0mm 0.05kPa 24135m 0.8m/s 0.77m/s
02:00 ☾
0% 2.4°C 0mm 94% 0cm -23° 3.2°C 0mm 0.04kPa 24135m 0.41m/s 0.37m/s
03:00 ☾
0% 1.8°C 0mm 95% 0cm -20° 2.6°C 0mm 0.04kPa 24135m 0.82m/s 0.85m/s
04:00 ☾
0% 1.2°C 0mm 96% 0cm -14° 1.8°C 0.19mm 0.03kPa 24134m 1.3m/s 1.3m/s
05:00 ☾
0% 0.9°C 0mm 97% 0cm -6.6° 1.4°C 0.56mm 0.02kPa 11765m 2.1m/s 1.9m/s
06:00
4% 0.4°C 0mm 80% 0cm 1.9° 3.6°C 0.52mm 0.16kPa 15888m 2.9m/s 2.6m/s
07:00
9% -0.8°C 0mm 62% 0cm 11° 5.9°C 0.48mm 0.35kPa 20012m 3.7m/s 3.4m/s
08:00
13% -3.1°C 0mm 45% 0cm 20° 8.2°C 0.44mm 0.6kPa 24135m 4.4m/s 4.2m/s
09:00
12% -2.8°C 0.03mm 49% 0cm 28° 7.1°C 0.58mm 0.51kPa 23550m 4.3m/s 3.8m/s
10:00
11% -2.7°C 0.05mm 54% 0cm 37° 6°C 0.73mm 0.43kPa 22965m 4.1m/s 3.4m/s
11:00
10% -2.7°C 0.08mm 58% 0cm 43° 4.9°C 0.88mm 0.37kPa 22380m 3.9m/s 3m/s
12:00
7% -3.3°C 0.08mm 59% 0.04cm 48° 4°C 0.79mm 0.33kPa 20531m 3.8m/s 2.8m/s
13:00
3% -3.9°C 0.08mm 60% 0.08cm 50° 3.1°C 0.71mm 0.3kPa 18683m 3.7m/s 2.7m/s
14:00
0% -4.5°C 0.08mm 61% 0.12cm 48° 2.2°C 0.63mm 0.28kPa 16834m 3.6m/s 2.5m/s
15:00
0% -4.9°C 0.05mm 65% 0.08cm 43° 0.91°C 0.67mm 0.23kPa 19268m 3.2m/s 2.3m/s
16:00
0% -5.3°C 0.03mm 69% 0.04cm 36° -0.36°C 0.71mm 0.18kPa 21701m 2.7m/s 2.1m/s
17:00 ☾
0% -5.8°C 0mm 73% 0cm 27° -1.6°C 0.75mm 0.15kPa 24135m 2.2m/s 1.9m/s
18:00 ☾
1% -5.8°C 0mm 74% 0cm 18° -1.8°C 0.5mm 0.14kPa 24135m 2.3m/s 1.8m/s
19:00 ☾
1% -5.8°C 0mm 75% 0cm 9.3° -2°C 0.25mm 0.13kPa 24135m 2.3m/s 1.8m/s
20:00 ☾
2% -5.8°C 0mm 76% 0cm 0.91° -2.2°C 0mm 0.13kPa 24135m 2.4m/s 1.7m/s
21:00 ☾
4% -6°C 0mm 76% 0cm -7.6° -2.4°C 0mm 0.12kPa 24135m 2.3m/s 1.7m/s
22:00 ☾
7% -6.3°C 0mm 76% 0cm -15° -2.6°C 0mm 0.12kPa 24135m 2.2m/s 1.6m/s
23:00 ☾
9% -6.5°C 0mm 75% 0cm -20° -2.8°C 0mm 0.12kPa 24135m 2.1m/s 1.6m/s
Thu, Apr 23 Sunrise 05:40 Sunset 20:10
24:00 ☾
33% -7.1°C 0mm 67% 0cm -24° -1.8°C 0mm 0.17kPa 24135m 2.2m/s 1.7m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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