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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 Spread9.3°C
Visibility24135 (Clear)
Relative Humidity51%
Wind Speed1.3m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in America/Edmonton
fog weather icon
Next opportunity
Moderate Fog
Castle Junction
Tomorrow · 01:00–05:00 · 4h window
Low confidence
37%
🌫️Fog Probability60.7-74.6%
Dewpoint Spread: 0.6°C
Visibility: 150 (Dense fog)
Relative Humidity: 96%
Wind Speed: 1.2m/s (calm conditions)
fog weather icon
Dense Fog
Castle Junction
Tomorrow · 19:00–21:00
🌫️Fog Probability:62.7-98.5%
Medium
fog weather icon
Moderate Fog
Castle Junction
Mon, Apr 13 · 01:00–02:00
🌫️Fog Probability:69.3%
Medium
fog weather icon
Moderate Fog
Castle Junction
Tue, Apr 14 · 24:00–01:00
🌫️Fog Probability:64.1%
Low
fog weather icon
Dense Fog
Castle Junction
Sat, Apr 18 · 19:00–01:00
🌫️Fog Probability:73.5-100%
High

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
8matching hours in the next 86 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 60.0%
Fri, Apr 10
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%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sun, Apr 12
24:000%
01:0063%
02:0075%
03:0061%
04:0063%
05:000%
06:000%
07:0041%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:0013%
16:0016%
17:000%
18:000%
19:0063%
20:0099%
21:0059%
22:0057%
23:0053%
Mon, Apr 13
24:0057%
01:0069%
02:0059%
03:0043%
04:0043%
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%
21:0024%
22:0036%
23:0051%
Tue, Apr 14
24:0064%
01:0046%
02:0031%
03:0019%
04:008.2%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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
Sat, Apr 11 Sunrise 06:56 Sunset 20:31
13:00 ☾
0% -3.5°C 0mm 51% 0cm 46° 5.8°C 0mm 0.45kPa 24135m 1.5m/s 1.3m/s
14:00 ☾
0% -3.9°C 0mm 49% 0cm 47° 6°C 0mm 0.48kPa 24134m 1.8m/s 1.7m/s
15:00 ☾
0% -3.2°C 0mm 52% 0cm 45° 6°C 0mm 0.45kPa 24134m 1.8m/s 1.8m/s
16:00 ☾
0% -2.6°C 0mm 54% 0cm 39° 6.1°C 0mm 0.44kPa 24134m 1.9m/s 1.9m/s
17:00 ☾
0% -2.2°C 0mm 59% 0cm 32° 5.1°C 0mm 0.36kPa 24135m 1.6m/s 1.6m/s
18:00 ☾
0% -1.8°C 0mm 61% 0cm 23° 5°C 0mm 0.34kPa 24134m 1.4m/s 1.4m/s
19:00 ☾
0% -0.5°C 0mm 72% 0cm 14° 4.2°C 0mm 0.23kPa 24135m 1.2m/s 1.3m/s
20:00 ☾
0% -1.2°C 0mm 82% 0cm 4.5° 1.5°C 0mm 0.12kPa 24135m 1.3m/s 1.4m/s
21:00 ☾
0% -2.2°C 0mm 87% 0cm -4.7° -0.33°C 0mm 0.08kPa 24135m 1m/s 1.1m/s
22:00 ☾
0% -2.8°C 0mm 88% 0cm -13° -1.1°C 0mm 0.07kPa 24134m 0.7m/s 0.82m/s
23:00 ☾
0% -2.6°C 0mm 90% 0cm -20° -1.3°C 0mm 0.05kPa 21294m 0.71m/s 0.73m/s
Sun, Apr 12 Sunrise 06:54 Sunset 20:33
24:00 ☾
0% -2.1°C 0.02mm 92% 0cm -26° -0.95°C 0mm 0.05kPa 21051m 1m/s 0.98m/s
01:00 ☾
0% -1.9°C 0.03mm 95% 0cm -29° -1.3°C 0mm 0.03kPa 1985m 1.2m/s 1.2m/s
02:00 ☾
0% -1.6°C 0.11mm 96% 0.11cm -30° -1°C 0.06mm 0.02kPa 150m 1.5m/s 1.2m/s
03:00 ☾
0% -1°C 0.33mm 98% 0.33cm -28° -0.7°C 0.31mm 0.01kPa 81m 1.8m/s 1.4m/s
04:00 ☾
0% -0.8°C 0.53mm 99% 0.53cm -23° -0.64°C 0.75mm 0.01kPa 71m 2.4m/s 1.9m/s
05:00 ☾
0% -1.5°C 0.7mm 98% 0.7cm -17° -1.2°C 1.4mm 0.01kPa 113m 3m/s 2.4m/s
06:00 ☾
0% -3°C 0.74mm 96% 0.74cm -8.8° -2.4°C 2.2mm 0.02kPa 137m 3m/s 2.5m/s
07:00 ☾
0% -3.8°C 0.52mm 95% 0.52cm 0.5° -3.2°C 0.69mm 0.02kPa 147m 2.8m/s 2.3m/s
08:00 ☾
0% -4°C 0.31mm 94% 0.31cm 9.4° -3.1°C 1.1mm 0.03kPa 180m 2.6m/s 2.2m/s
09:00 ☾
0% -4°C 0.21mm 90% 0.21cm 19° -2.6°C 1.3mm 0.05kPa 312m 2.6m/s 2.3m/s
10:00 ☾
0% -4.2°C 0.12mm 84% 0.12cm 28° -1.9°C 1.5mm 0.08kPa 1419m 2.3m/s 2.3m/s
11:00 ☾
0% -4°C 0.13mm 81% 0.13cm 36° -1.3°C 1.7mm 0.1kPa 2085m 2.2m/s 2.3m/s
12:00 ☾
0% -3.7°C 0.07mm 80% 0cm 43° -0.72°C 1.8mm 0.12kPa 3017m 2m/s 2.5m/s
13:00 ☾
0% -3.2°C 0.05mm 79% 0cm 47° 0.05°C 0.13mm 0.13kPa 5446m 2m/s 2.5m/s
14:00 ☾
0% -2.5°C 0.12mm 79% 0cm 48° 0.83°C 0.25mm 0.14kPa 3570m 2m/s 2.5m/s
15:00 ☾
0% -1.3°C 0.4mm 88% 0.42cm 45° 0.55°C 0.5mm 0.08kPa 706m 2.1m/s 2.3m/s
16:00 ☾
0% -0.8°C 0.23mm 92% 0.26cm 39° 0.35°C 0.94mm 0.05kPa 745m 2.1m/s 2.1m/s
17:00 ☾
0% -0.9°C 0.05mm 88% 0.09cm 32° 0.82°C 1.1mm 0.08kPa 4217m 1.9m/s 1.7m/s
18:00 ☾
0% -0.7°C 0.02mm 90% 0.06cm 23° 0.76°C 1.2mm 0.06kPa 2817m 1.6m/s 1.3m/s
19:00 ☾
0% -0.4°C 0.04mm 95% 0.1cm 14° 0.33°C 0.06mm 0.03kPa 1182m 1.5m/s 1.3m/s
20:00 ☾
0% -0.4°C 0.05mm 98% 0.07cm 4.7° -0.09°C 0.19mm 0.01kPa 289m 1.6m/s 1.3m/s
21:00 ☾
0% -0.7°C 0.11mm 98% 0.11cm -4.4° -0.45°C 0.25mm 0.01kPa 208m 1.4m/s 1.1m/s
22:00 ☾
0% -0.9°C 0.07mm 98% 0.07cm -13° -0.63°C 0.38mm 0.01kPa 269m 1.2m/s 1m/s
23:00 ☾
0% -1°C 0.03mm 97% 0cm -20° -0.63°C 0.38mm 0.02kPa 574m 1.1m/s 0.88m/s
Mon, Apr 13 Sunrise 06:52 Sunset 20:35
24:00 ☾
0% -1.5°C 0.02mm 98% 0cm -26° -1.3°C 0.38mm 0.01kPa 1015m 0.6m/s 0.51m/s
01:00 ☾
0% -1.4°C 0.01mm 96% 0cm -29° -0.87°C 0mm 0.02kPa 7283m 0.6m/s 0.64m/s
02:00 ☾
0% -1.5°C 0.01mm 95% 0cm -30° -0.83°C 0mm 0.03kPa 8980m 0.8m/s 0.84m/s
03:00 ☾
0% -1.7°C 0.01mm 94% 0cm -27° -0.85°C 0mm 0.03kPa 21375m 0.81m/s 0.84m/s
04:00 ☾
0% -1.8°C 0.01mm 93% 0cm -23° -0.85°C 0.06mm 0.04kPa 21616m 0.91m/s 0.96m/s
05:00 ☾
0% -2°C 0.01mm 92% 0cm -16° -0.9°C 0.06mm 0.05kPa 22217m 1.5m/s 1.5m/s
06:00 ☾
0% -2°C 0.01mm 92% 0cm -8.4° -0.95°C 0.06mm 0.04kPa 21964m 1.6m/s 1.5m/s
07:00 ☾
0% -2.2°C 0.01mm 93% 0cm 0.78° -1.2°C 0mm 0.04kPa 23631m 1.5m/s 1.3m/s
08:00 ☾
0% -2.2°C 0mm 90% 0cm 9.7° -0.75°C 0mm 0.06kPa 24135m 1.6m/s 1.3m/s
09:00 ☾
0% -2.3°C 0.01mm 84% 0cm 19° 0.12°C 0mm 0.1kPa 24125m 1.9m/s 1.6m/s
10:00 ☾
0% -2.9°C 0mm 75% 0cm 28° 1°C 0.06mm 0.16kPa 18411m 2m/s 1.9m/s
11:00 ☾
0% -3.5°C 0.01mm 73% 0cm 36° 0.85°C 0.06mm 0.18kPa 24047m 2.2m/s 2m/s
12:00 ☾
0% -2.8°C 0.01mm 78% 0cm 43° 0.65°C 0.06mm 0.14kPa 24079m 2.2m/s 2m/s
13:00 ☾
0% -2.4°C 0mm 78% 0.02cm 47° 0.95°C 0mm 0.14kPa 13103m 2.3m/s 2m/s
14:00 ☾
0% -2.5°C 0mm 76% 0.04cm 48° 1.4°C 0.06mm 0.16kPa 7717m 2.4m/s 1.9m/s
15:00 ☾
0% -2.8°C 0mm 70% 0.04cm 45° 2.2°C 0.06mm 0.22kPa 7177m 2.6m/s 1.9m/s
16:00 ☾
0% -3°C 0mm 66% 0cm 40° 2.6°C 0.13mm 0.25kPa 24135m 2.7m/s 2m/s
17:00 ☾
0% -2.6°C 0mm 68% 0.04cm 32° 2.7°C 0.25mm 0.24kPa 24135m 2.8m/s 2m/s
18:00 ☾
0% -2.6°C 0mm 66% 0.08cm 23° 3.1°C 0.31mm 0.26kPa 24134m 3.2m/s 2.3m/s
19:00 ☾
0% -2.9°C 0.007mm 75% 0.08cm 14° 0.97°C 0.29mm 0.16kPa 18907m 2.9m/s 2.2m/s
20:00 ☾
0% -3.5°C 0.01mm 84% 0.07cm 5° -1.1°C 0.27mm 0.09kPa 13679m 2.6m/s 2.1m/s
21:00 ☾
0% -4.2°C 0.02mm 93% 0.07cm -4.2° -3.3°C 0.25mm 0.03kPa 8452m 2.3m/s 2m/s
22:00 ☾
0% -4.2°C 0.03mm 95% 0.07cm -13° -3.6°C 0.31mm 0.02kPa 5948m 2.7m/s 2.2m/s
23:00 ☾
0% -4.3°C 0.03mm 97% 0.07cm -20° -3.9°C 0.38mm 0.01kPa 3444m 3.1m/s 2.3m/s
Tue, Apr 14 Sunrise 06:50 Sunset 20:36
24:00 ☾
0% -4.3°C 0.04mm 99% 0.07cm -25° -4.2°C 0.44mm 0kPa 939m 3.5m/s 2.5m/s
01:00 ☾
0% -4.3°C 0.07mm 97% 0.15cm -29° -3.9°C 0.44mm 0.01kPa 680m 3.5m/s 2.5m/s
02:00 ☾
0% -4.4°C 0.09mm 95% 0.23cm -29° -3.7°C 0.44mm 0.02kPa 420m 3.5m/s 2.6m/s
03:00 ☾
0% -4.4°C 0.12mm 93% 0.3cm -27° -3.4°C 0.44mm 0.04kPa 161m 3.5m/s 2.6m/s
04:00 ☾
0% -5.1°C 0.12mm 83% 0.26cm -23° -2.5°C 0.75mm 0.09kPa 1768m 4.5m/s 3.1m/s
05:00 ☾
0% -5.9°C 0.12mm 73% 0.22cm -16° -1.7°C 1.1mm 0.15kPa 3376m 5.5m/s 3.5m/s
06:00 ☾
0% -7°C 0.12mm 63% 0.18cm -8.1° -0.87°C 1.4mm 0.21kPa 4983m 6.5m/s 3.9m/s
07:00 ☾
0% -7.3°C 0.1mm 63% 0.15cm 1.1° -1.2°C 1.1mm 0.21kPa 6772m 7.3m/s 4.2m/s
08:00 ☾
0% -7.6°C 0.08mm 63% 0.13cm 10° -1.5°C 0.83mm 0.2kPa 8561m 8.1m/s 4.5m/s
09:00 ☾
0% -7.8°C 0.06mm 63% 0.1cm 19° -1.8°C 0.56mm 0.2kPa 10350m 8.9m/s 4.8m/s
10:00 ☾
0% -8.6°C 0.04mm 62% 0.07cm 28° -2.2°C 0.65mm 0.2kPa 14945m 9m/s 4.2m/s
11:00 ☾
0% -9.3°C 0.03mm 60% 0.03cm 37° -2.7°C 0.73mm 0.2kPa 19540m 9m/s 3.6m/s
12:00 ☾
0% -10°C 0.01mm 59% 0cm 43° -3.1°C 0.81mm 0.2kPa 24135m 9m/s 3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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