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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

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread7.3°C
Visibility17699 (Clear)
Relative Humidity58%
Wind Speed1.9m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Edmonton
fog weather icon
Next opportunity
Dense Fog
Castle Junction
Tomorrow · 02:00–06:00 · 4h window
Medium confidence
65%
🌫️Fog Probability61.4-91.1%
Dewpoint Spread: 0.3°C
Visibility: 7762 (Moderate)
Relative Humidity: 97%
Wind Speed: 0.8m/s (calm conditions)
fog weather icon
Dense Fog at Sunrise
Castle Junction
Tomorrow · 06:00–08:00
🌫️Fog Probability:96-100%
High
fog weather icon
Moderate Fog
Castle Junction
Tomorrow · 08:00–09:00
🌫️Fog Probability:64.1%
Medium
fog weather icon
Dense Fog
Castle Junction
Mon, Apr 13 · 20:00–24:00
🌫️Fog Probability:66.7-100%
Medium
fog weather icon
Dense Fog
Castle Junction
Tue, Apr 14 · 15:00–17:00
🌫️Fog Probability:65.2-85.6%
Medium

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
7matching hours in the next 91 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 60.0%
Tue, Apr 7
23:000%
Wed, Apr 8
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%
Thu, Apr 9
24:0024%
01:0046%
02:0061%
03:0078%
04:0085%
05:0091%
06:0096%
07:00100%
08:0064%
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%
Fri, Apr 10
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%
Sat, Apr 11
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%
13:0011%
14:0015%
15:000%
16:000%
17:000%
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
Wed, Apr 8 Sunrise 07:01 Sunset 20:28
19:00 ☾
0% -8.2°C 0mm 58% 0.3cm 13° -0.95°C 0.13mm 0.24kPa 17699m 2.9m/s 1.9m/s
20:00 ☾
0% -6.6°C 0mm 73% 0.18cm 3.8° -2.5°C 0.44mm 0.14kPa 21511m 1.4m/s 1.7m/s
21:00 ☾
0% -7.2°C 0mm 88% 0cm -5.5° -5.6°C 0.5mm 0.05kPa 24135m 1.6m/s 1.8m/s
22:00 ☾
0% -7.6°C 0mm 87% 0cm -14° -5.7°C 0.56mm 0.05kPa 24135m 1.7m/s 1.8m/s
23:00 ☾
1% -8°C 0mm 89% 0cm -21° -6.5°C 0.56mm 0.04kPa 24134m 1.5m/s 1.6m/s
Thu, Apr 9 Sunrise 07:01 Sunset 20:28
24:00 ☾
1% -8.2°C 0mm 92% 0cm -27° -7.2°C 0.56mm 0.03kPa 24101m 1.1m/s 1.2m/s
01:00 ☾
24% -8.5°C 0mm 94% 0cm -30° -7.7°C 0mm 0.02kPa 24087m 0.8m/s 0.93m/s
02:00 ☾
46% -8.9°C 0mm 95% 0cm -31° -8.3°C 0mm 0.02kPa 24085m 0.8m/s 1.1m/s
03:00 ☾
69% -9.1°C 0mm 96% 0cm -29° -8.7°C 0mm 0.01kPa 22736m 0.7m/s 0.83m/s
04:00 ☾
67% -9.3°C 0mm 97% 0cm -24° -8.9°C 0mm 0.01kPa 10417m 0.7m/s 0.79m/s
05:00 ☾
64% -9.5°C 0mm 97% 0cm -18° -9.2°C 0mm 0.01kPa 7762m 0.7m/s 0.76m/s
06:00 ☾
62% -9.7°C 0mm 98% 0cm -9.8° -9.4°C 0mm 0.01kPa 4272m 0.8m/s 0.93m/s
07:00 ☾
53% -9.9°C 0mm 98% 0cm -0.63° -9.7°C 0mm 0kPa 3404m 0.83m/s 0.94m/s
08:00 ☾
44% -8.7°C 0.01mm 95% 0cm 8.4° -8°C 0mm 0.02kPa 3504m 1.1m/s 0.96m/s
09:00 ☾
35% -7.7°C 0mm 89% 0cm 18° -6.2°C 0mm 0.04kPa 11779m 0.9m/s 1.2m/s
10:00 ☾
29% -7.1°C 0mm 79% 0cm 27° -4.1°C 0mm 0.09kPa 24134m 0.71m/s 1.1m/s
11:00 ☾
22% -6.6°C 0mm 71% 0cm 35° -2°C 0mm 0.15kPa 24134m 1.3m/s 1.1m/s
12:00 ☾
16% -6.8°C 0mm 61% 0.03cm 41° -0.27°C 0mm 0.23kPa 12531m 1.7m/s 1.1m/s
13:00 ☾
11% -7.3°C 0mm 54% 0cm 46° 0.97°C 0mm 0.3kPa 14625m 2.1m/s 1.4m/s
14:00 ☾
5% -7.4°C 0mm 50% 0cm 46° 1.9°C 0.06mm 0.35kPa 24134m 2.1m/s 1.4m/s
15:00 ☾
0% -7.6°C 0mm 48% 0cm 44° 2.3°C 0.06mm 0.37kPa 24134m 2.5m/s 1.8m/s
16:00 ☾
0% -7.7°C 0mm 47% 0cm 38° 2.5°C 0.06mm 0.39kPa 24135m 2.6m/s 2m/s
17:00 ☾
0% -7.7°C 0mm 47% 0cm 31° 2.5°C 0.06mm 0.39kPa 24134m 2.4m/s 2.1m/s
18:00 ☾
0% -7.6°C 0mm 48% 0cm 22° 2.2°C 0.06mm 0.37kPa 24135m 2.2m/s 1.9m/s
19:00 ☾
0% -6.6°C 0mm 55% 0cm 13° 1.6°C 0mm 0.31kPa 24134m 1.9m/s 1.7m/s
20:00 ☾
0% -5.4°C 0mm 73% 0cm 4° -1.1°C 0mm 0.15kPa 24134m 1.4m/s 1.6m/s
21:00 ☾
0% -6°C 0mm 81% 0cm -5.2° -3.2°C 0mm 0.09kPa 24135m 1.4m/s 1.5m/s
22:00 ☾
7% -6°C 0mm 82% 0cm -14° -3.5°C 0mm 0.08kPa 24134m 1.1m/s 1.2m/s
23:00 ☾
14% -6.2°C 0mm 82% 0cm -21° -3.6°C 0mm 0.08kPa 24134m 1.1m/s 1.2m/s
Fri, Apr 10 Sunrise 06:59 Sunset 20:30
24:00 ☾
21% -6.3°C 0mm 82% 0cm -27° -3.7°C 0mm 0.08kPa 24135m 1.1m/s 1.2m/s
01:00 ☾
37% -6.3°C 0mm 82% 0cm -30° -3.8°C 0mm 0.08kPa 24134m 1m/s 1.1m/s
02:00 ☾
53% -6.6°C 0mm 82% 0cm -31° -4°C 0mm 0.08kPa 24134m 0.91m/s 0.94m/s
03:00 ☾
69% -6.8°C 0mm 82% 0cm -29° -4.2°C 0mm 0.08kPa 24135m 1m/s 1.1m/s
04:00 ☾
72% -7°C 0mm 82% 0cm -24° -4.4°C 0mm 0.08kPa 24135m 0.9m/s 1.1m/s
05:00 ☾
75% -7.1°C 0mm 82% 0cm -17° -4.6°C 0mm 0.08kPa 24134m 1m/s 1.1m/s
06:00 ☾
78% -7.2°C 0mm 83% 0cm -9.4° -4.7°C 0mm 0.07kPa 24134m 1m/s 1.1m/s
07:00 ☾
73% -7.3°C 0mm 84% 0cm -0.12° -4.9°C 0mm 0.07kPa 24134m 1m/s 1.1m/s
08:00 ☾
69% -6.7°C 0mm 78% 0cm 8.8° -3.4°C 0mm 0.11kPa 24134m 1m/s 1.1m/s
09:00 ☾
64% -6.4°C 0mm 65% 0cm 18° -0.59°C 0mm 0.21kPa 24134m 1.2m/s 0.97m/s
10:00 ☾
58% -6.5°C 0mm 57% 0cm 27° 1°C 0mm 0.28kPa 24134m 1.5m/s 1.2m/s
11:00 ☾
53% -6.5°C 0mm 52% 0cm 35° 2.5°C 0mm 0.35kPa 24135m 1.5m/s 1.3m/s
12:00 ☾
47% -6.4°C 0mm 48% 0cm 42° 3.7°C 0mm 0.41kPa 24135m 1.6m/s 1.3m/s
13:00 ☾
43% -6.2°C 0mm 45% 0cm 46° 4.8°C 0mm 0.47kPa 24135m 1.6m/s 1.4m/s
14:00 ☾
40% -6°C 0mm 43% 0cm 47° 5.7°C 0mm 0.53kPa 24134m 1.7m/s 1.5m/s
15:00 ☾
36% -5.7°C 0mm 41% 0cm 44° 6.5°C 0mm 0.57kPa 24135m 1.7m/s 1.6m/s
16:00 ☾
40% -5.5°C 0mm 41% 0cm 39° 6.8°C 0mm 0.58kPa 24134m 1.6m/s 1.6m/s
17:00 ☾
43% -5.2°C 0mm 42% 0cm 31° 6.6°C 0mm 0.56kPa 24135m 1.7m/s 1.8m/s
18:00 ☾
47% -4.8°C 0mm 46% 0cm 23° 6.1°C 0mm 0.51kPa 24134m 1.6m/s 1.8m/s
19:00 ☾
40% -2.2°C 0mm 60% 0cm 14° 4.8°C 0mm 0.34kPa 24134m 1.3m/s 1.5m/s
20:00 ☾
34% -3.1°C 0mm 74% 0cm 4.3° 1.1°C 0mm 0.17kPa 24134m 1.2m/s 1.3m/s
21:00 ☾
27% -4.1°C 0mm 79% 0cm -4.9° -0.94°C 0mm 0.12kPa 24135m 0.8m/s 0.82m/s
22:00 ☾
21% -4.6°C 0mm 78% 0cm -13° -1.3°C 0mm 0.12kPa 24135m 0.6m/s 0.51m/s
23:00 ☾
15% -4.5°C 0mm 80% 0cm -21° -1.4°C 0mm 0.11kPa 24135m 0.22m/s 0.35m/s
Sat, Apr 11 Sunrise 06:56 Sunset 20:31
24:00 ☾
9% -4.5°C 0mm 82% 0cm -26° -1.9°C 0mm 0.09kPa 24135m 0.5m/s 0.63m/s
01:00 ☾
6% -4.1°C 0.03mm 85% 0.03cm -30° -1.9°C 0.06mm 0.08kPa 18466m 0.88m/s 0.96m/s
02:00 ☾
3% -3.7°C 0.06mm 87% 0.06cm -30° -1.9°C 0.13mm 0.07kPa 12797m 1.3m/s 1.3m/s
03:00 ☾
0% -3.3°C 0.09mm 90% 0.09cm -28° -1.9°C 0.19mm 0.05kPa 7128m 1.6m/s 1.6m/s
04:00 ☾
0% -3.1°C 0.06mm 83% 0.06cm -24° -0.48°C 0.21mm 0.1kPa 12797m 1.5m/s 1.4m/s
05:00 ☾
0% -3°C 0.03mm 75% 0.03cm -17° 0.95°C 0.23mm 0.16kPa 18466m 1.3m/s 1.2m/s
06:00 ☾
0% -3°C 0mm 68% 0cm -9.1° 2.4°C 0.25mm 0.23kPa 24135m 1.2m/s 1m/s
07:00 ☾
0% -3.1°C 0mm 64% 0.01cm 0.22° 3.1°C 0.19mm 0.28kPa 21389m 1.4m/s 1.1m/s
08:00 ☾
1% -3.3°C 0mm 60% 0.02cm 9.1° 3.9°C 0.13mm 0.33kPa 18642m 1.6m/s 1.1m/s
09:00 ☾
1% -3.5°C 0mm 56% 0.03cm 18° 4.6°C 0.06mm 0.38kPa 15895m 1.7m/s 1.1m/s
10:00 ☾
1% -2.4°C 0.007mm 63% 0.07cm 27° 4°C 0.1mm 0.3kPa 10825m 1.5m/s 1.3m/s
11:00 ☾
0% -1.5°C 0.01mm 70% 0.11cm 36° 3.4°C 0.15mm 0.23kPa 5754m 1.3m/s 1.4m/s
12:00 ☾
0% -0.8°C 0.02mm 77% 0.15cm 42° 2.8°C 0.19mm 0.17kPa 683m 1.1m/s 1.5m/s
13:00 ☾
1% -0.7°C 0.33mm 84% 0.42cm 46° 1.7°C 0.58mm 0.11kPa 490m 1.3m/s 1.6m/s
14:00 ☾
3% -0.8°C 0.63mm 91% 0.69cm 47° 0.55°C 0.98mm 0.06kPa 298m 1.6m/s 1.7m/s
15:00 ☾
4% -0.9°C 0.94mm 98% 0.96cm 45° -0.58°C 1.4mm 0.01kPa 105m 1.8m/s 1.8m/s
16:00 ☾
3% -1.4°C 0.75mm 97% 0.77cm 39° -1°C 2mm 0.02kPa 149m 1.8m/s 1.7m/s
17:00 ☾
1% -1.9°C 0.57mm 97% 0.57cm 32° -1.5°C 2.5mm 0.02kPa 192m 1.8m/s 1.6m/s
18:00 ☾
0% -2.4°C 0.38mm 96% 0.38cm 23° -1.9°C 3.1mm 0.02kPa 236m 1.8m/s 1.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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