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Rule Fog Hunter

Castle Junction - Fog Hunter - Canadian Rockies

Castle Junction, 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 Spread2.2°C
Visibility24135 (Clear)
Relative Humidity86%
Wind Speed1.3m/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 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
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%
18:000%
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 05:41 Sunset 21:40
07:00
1% 0.6°C 0mm 86% 0cm 10° 2.8°C 0mm 0.11kPa 24135m 1.1m/s 1.3m/s
08:00
2% 1°C 0mm 76% 0cm 19° 4.9°C 0mm 0.21kPa 24135m 1.7m/s 1.4m/s
09:00
3% 0.9°C 0mm 66% 0cm 28° 6.9°C 0mm 0.34kPa 24134m 2.4m/s 1.8m/s
10:00
2% -0.1°C 0mm 56% 0cm 38° 8°C 0mm 0.47kPa 24134m 2.8m/s 2.3m/s
11:00
1% -1.3°C 0mm 48% 0cm 46° 9.1°C 0mm 0.6kPa 24134m 5.1m/s 2.5m/s
12:00
0% -2.2°C 0mm 41% 0cm 54° 10°C 0mm 0.74kPa 24134m 6.5m/s 2.9m/s
13:00
0% -2.4°C 0mm 39% 0cm 59° 11°C 0mm 0.8kPa 24135m 6.8m/s 3.1m/s
14:00
0% -2.3°C 0mm 41% 0cm 59° 11°C 0mm 0.76kPa 24134m 6.9m/s 2.8m/s
15:00
0% -2°C 0mm 42% 0cm 56° 10°C 0mm 0.73kPa 24135m 6.5m/s 2.2m/s
16:00
0% -1.9°C 0mm 39% 0cm 49° 11°C 0mm 0.82kPa 24134m 6.9m/s 2.6m/s
17:00
0% -2.5°C 0mm 39% 0cm 41° 11°C 0mm 0.8kPa 24135m 7.9m/s 3.8m/s
18:00 ☾
0% -2.1°C 0mm 38% 0cm 32° 12°C 0mm 0.84kPa 24135m 9m/s 4.3m/s
19:00 ☾
0% -2.2°C 0mm 40% 0cm 22° 11°C 0mm 0.77kPa 24135m 7.9m/s 3.1m/s
20:00 ☾
0% -1.3°C 0mm 45% 0cm 13° 10°C 0mm 0.68kPa 24135m 7.5m/s 2.2m/s
21:00 ☾
0% -0.7°C 0mm 55% 0cm 4.8° 7.8°C 0mm 0.48kPa 24135m 1.7m/s 2.1m/s
22:00 ☾
0% -1.4°C 0mm 61% 0cm -3.1° 5.6°C 0mm 0.36kPa 24134m 1.8m/s 2m/s
23:00 ☾
0% -1.4°C 0mm 64% 0cm -9.6° 4.8°C 0mm 0.31kPa 24134m 1.7m/s 2m/s
Mon, May 25 Sunrise 05:40 Sunset 21:42
24:00 ☾
0% -1.3°C 0mm 67% 0cm -14° 4.4°C 0mm 0.28kPa 24134m 1.8m/s 2m/s
01:00 ☾
0% -1.2°C 0mm 70% 0cm -17° 3.7°C 0mm 0.24kPa 24135m 1.7m/s 1.9m/s
02:00 ☾
0% -1°C 0mm 73% 0cm -18° 3.4°C 0mm 0.21kPa 24134m 1.6m/s 1.7m/s
03:00 ☾
0% -0.8°C 0mm 75% 0cm -16° 3.1°C 0mm 0.19kPa 24135m 1.6m/s 1.8m/s
04:00 ☾
0% -0.4°C 0mm 74% 0cm -12° 3.7°C 0mm 0.2kPa 24135m 1.7m/s 1.9m/s
05:00 ☾
0% -0.1°C 0mm 77% 0cm -5.5° 3.6°C 0mm 0.18kPa 24134m 1.8m/s 2.1m/s
06:00
0% 0.1°C 0mm 80% 0cm 2.1° 3.2°C 0mm 0.15kPa 24135m 2m/s 2.3m/s
07:00
0% 1°C 0mm 78% 0cm 10° 4.5°C 0mm 0.19kPa 24134m 2.3m/s 1.9m/s
08:00
1% 2°C 0mm 75% 0cm 19° 6.1°C 0mm 0.24kPa 24134m 2.4m/s 2m/s
09:00
1% 2.3°C 0mm 72% 0cm 29° 7°C 0mm 0.28kPa 24134m 2.9m/s 2.3m/s
10:00
1% 2.5°C 0mm 63% 0cm 38° 9.1°C 0mm 0.43kPa 24134m 3.4m/s 2.6m/s
11:00
1% 2.2°C 0mm 55% 0cm 47° 11°C 0.06mm 0.59kPa 24135m 5.7m/s 2.8m/s
12:00
1% 0.7°C 0mm 44% 0cm 54° 13°C 0.06mm 0.8kPa 24134m 8.5m/s 3.2m/s
13:00
1% -0.2°C 0mm 39% 0cm 59° 14°C 0mm 0.95kPa 24135m 10m/s 4m/s
14:00
2% -0.3°C 0mm 37% 0cm 60° 14°C 0mm 1kPa 24134m 10m/s 4.2m/s
15:00
2% -1.6°C 0mm 33% 0cm 56° 14°C 0mm 1.1kPa 24135m 10m/s 3.8m/s
16:00
1% -2.8°C 0mm 28% 0cm 49° 16°C 0mm 1.3kPa 24134m 10m/s 4.3m/s
17:00
1% -3.9°C 0mm 26% 0cm 41° 15°C 0mm 1.3kPa 24134m 11m/s 4.8m/s
18:00 ☾
0% -4.7°C 0mm 25% 0cm 32° 15°C 0mm 1.3kPa 24135m 9.1m/s 4.3m/s
19:00 ☾
1% -4°C 0mm 28% 0cm 23° 14°C 0mm 1.2kPa 24134m 6.3m/s 3.2m/s
20:00 ☾
1% -1.9°C 0mm 34% 0cm 13° 14°C 0mm 1kPa 24135m 4m/s 2.5m/s
21:00 ☾
2% -0.9°C 0mm 46% 0cm 4.9° 10°C 0mm 0.68kPa 24134m 2m/s 2.1m/s
22:00 ☾
2% -2.1°C 0mm 50% 0cm -2.9° 7.7°C 0mm 0.53kPa 24134m 1.5m/s 1.5m/s
23:00 ☾
3% -2.3°C 0mm 52% 0cm -9.4° 6.8°C 0mm 0.47kPa 24134m 1.7m/s 1.8m/s
Tue, May 26 Sunrise 05:38 Sunset 21:43
24:00 ☾
3% -0.5°C 0.6mm 56% 0cm -14° 7.7°C 0.06mm 0.46kPa 19931m 1.7m/s 1.8m/s
01:00 ☾
4% 2.7°C 0mm 79% 0cm -17° 6°C 1.6mm 0.19kPa 24134m 2.4m/s 2.2m/s
02:00 ☾
5% 2.7°C 0.01mm 82% 0cm -17° 5.4°C 1.6mm 0.16kPa 24135m 0.62m/s 0.7m/s
03:00 ☾
6% 3.2°C 0.44mm 86% 0cm -15° 5.4°C 1.8mm 0.13kPa 19313m 2.4m/s 2.2m/s
04:00 ☾
5% 3.9°C 0.03mm 92% 0cm -11° 5.2°C 3.6mm 0.07kPa 24135m 1.7m/s 1.3m/s
05:00 ☾
3% 3.4°C 0mm 94% 0cm -5.4° 4.2°C 3.6mm 0.05kPa 24134m 1.1m/s 1.2m/s
06:00
2% 2.8°C 0mm 95% 0cm 2.2° 3.5°C 3.6mm 0.04kPa 24134m 1.1m/s 1.2m/s
07:00
1% 3.4°C 0mm 90% 0cm 10° 4.8°C 0mm 0.08kPa 24134m 0.5m/s 0.42m/s
08:00
1% 3.4°C 0mm 82% 0cm 19° 6.3°C 0mm 0.17kPa 24135m 0.93m/s 0.76m/s
09:00
0% 3.7°C 0mm 74% 0cm 29° 8.1°C 0mm 0.28kPa 24135m 0.91m/s 0.68m/s
10:00
0% 4.5°C 0mm 67% 0cm 38° 10°C 0mm 0.42kPa 24134m 1.2m/s 0.96m/s
11:00
0% 5°C 0mm 62% 0cm 47° 12°C 0mm 0.54kPa 24135m 1.6m/s 1.3m/s
12:00
0% 5.4°C 0mm 57% 0cm 54° 14°C 0mm 0.67kPa 24134m 1.8m/s 1.4m/s
13:00
1% 5.7°C 0.05mm 69% 0cm 59° 11°C 4.2mm 0.41kPa 24134m 2.4m/s 1.9m/s
14:00
2% 5.4°C 0.11mm 81% 0cm 60° 8.5°C 8.4mm 0.21kPa 24135m 3m/s 2.4m/s
15:00
3% 4.8°C 0.16mm 93% 0cm 56° 6°C 13mm 0.07kPa 24135m 3.6m/s 2.9m/s
16:00
2% 4.6°C 0.11mm 90% 0cm 50° 6.1°C 13mm 0.09kPa 24135m 3.3m/s 2.6m/s
17:00
2% 4.4°C 0.05mm 88% 0cm 41° 6.2°C 13mm 0.11kPa 24135m 2.9m/s 2.4m/s
18:00 ☾
1% 4.2°C 0mm 86% 0cm 32° 6.4°C 13mm 0.13kPa 24135m 2.6m/s 2.1m/s
19:00 ☾
1% 4.4°C 0.01mm 87% 0cm 23° 6.4°C 8.5mm 0.12kPa 23635m 2.4m/s 2.2m/s
20:00 ☾
0% 4.6°C 0.02mm 88% 0cm 14° 6.4°C 4.3mm 0.11kPa 23135m 2.3m/s 2.2m/s
21:00 ☾
0% 4.8°C 0.03mm 89% 0cm 5.1° 6.5°C 0.13mm 0.1kPa 22635m 2.1m/s 2.2m/s
22:00 ☾
0% 5.3°C 0.51mm 92% 0cm -2.7° 6.5°C 0.94mm 0.08kPa 18154m 1.8m/s 1.7m/s
23:00 ☾
0% 5.7°C 0.99mm 94% 0cm -9.3° 6.6°C 1.8mm 0.06kPa 13674m 1.5m/s 1.2m/s
Wed, May 27 Sunrise 05:37 Sunset 21:44
24:00 ☾
0% 6.2°C 1.5mm 97% 0cm -14° 6.6°C 2.6mm 0.03kPa 9193m 1.1m/s 0.74m/s
01:00 ☾
1% 6.2°C 0.99mm 96% 0cm -17° 6.8°C 2.2mm 0.04kPa 14174m 1.3m/s 0.89m/s
02:00 ☾
1% 6.3°C 0.52mm 95% 0cm -17° 7°C 1.8mm 0.05kPa 19154m 1.4m/s 1m/s
03:00 ☾
2% 6.3°C 0.04mm 94% 0cm -15° 7.2°C 1.4mm 0.06kPa 24135m 1.5m/s 1.2m/s
04:00 ☾
2% 6.5°C 0.03mm 89% 0cm -11° 8.2°C 1.4mm 0.12kPa 24135m 1.4m/s 1.2m/s
05:00 ☾
1% 6.6°C 0.02mm 84% 0cm -5.2° 9.2°C 1.4mm 0.19kPa 24135m 1.2m/s 1.1m/s
06:00
1% 6.6°C 0.01mm 79% 0cm 2.3° 10°C 1.4mm 0.26kPa 24135m 1.1m/s 1.1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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