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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 Spread8.0°C
Visibility24134 (Clear)
Relative Humidity57%
Wind Speed2.1m/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
Tue, Apr 28 · 24:00–01:00 · 1h window
Low confidence
30%
🌫️Fog Probability62.7%
Dewpoint Spread: 0.6°C
Visibility: 9332 (Moderate)
Relative Humidity: 95%
Wind Speed: 0.8m/s (calm conditions)
fog weather icon
Moderate Fog at Sunset
Castle Junction
Tue, Apr 28 · 21:00–22:00
🌫️Fog Probability:61.4%
Low
fog weather icon
Dense Fog at Sunset
Castle Junction
Wed, Apr 29 · 21:00–22:00
🌫️Fog Probability:97.3%
Medium
fog weather icon
Dense Fog
Castle Junction
Wed, Apr 29 · 22:00–01:00
🌫️Fog Probability:88.6%
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
0matching hours in the next 95 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 60.0%
Mon, Apr 20
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%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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13:000%
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16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Apr 22
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%
14:0013%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Thu, Apr 23
24:000%
01:0028%
02:0015%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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Fri, Apr 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%
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
Tue, Apr 21 Sunrise 06:35 Sunset 20:50
13:00
38% 1.5°C 0mm 57% 0cm 50° 9.5°C 0mm 0.51kPa 24134m 2.6m/s 2.1m/s
14:00
23% 1.4°C 0mm 56% 0cm 51° 9.7°C 0mm 0.52kPa 24134m 3.4m/s 2.4m/s
15:00
8% 1.4°C 0mm 56% 0cm 48° 9.8°C 0mm 0.53kPa 24134m 3.5m/s 2.3m/s
16:00
5% 1.5°C 0mm 56% 0cm 42° 9.8°C 0.06mm 0.53kPa 24134m 3.1m/s 2.2m/s
17:00
3% 1.9°C 0mm 59% 0cm 34° 9.5°C 0.13mm 0.49kPa 24012m 2.7m/s 2m/s
18:00 ☾
0% 2.2°C 0mm 63% 0cm 25° 9°C 0.25mm 0.43kPa 23891m 2m/s 1.6m/s
19:00 ☾
2% 4°C 0mm 78% 0cm 16° 7.7°C 0.19mm 0.23kPa 24135m 1.9m/s 1.6m/s
20:00 ☾
5% 2.5°C 0mm 85% 0cm 6.8° 4.9°C 0.19mm 0.13kPa 24134m 1.4m/s 1.4m/s
21:00 ☾
7% -0.3°C 0mm 87% 0cm -2.1° 1.5°C 0.31mm 0.09kPa 24135m 0.71m/s 0.67m/s
22:00 ☾
5% -0.9°C 0mm 88% 0cm -10° 0.91°C 0.38mm 0.08kPa 23834m 0.5m/s 0.4m/s
23:00 ☾
2% -0.9°C 0mm 89% 0cm -17° 0.71°C 0.44mm 0.07kPa 24135m 0.4m/s 0.24m/s
Wed, Apr 22 Sunrise 06:33 Sunset 20:51
24:00 ☾
0% -0.7°C 0mm 90% 0cm -23° 0.72°C 0.5mm 0.07kPa 24134m 0.5m/s 0.47m/s
01:00 ☾
0% -0.8°C 0mm 90% 0cm -26° 0.73°C 0mm 0.07kPa 24134m 1.3m/s 1.6m/s
02:00 ☾
0% -0.6°C 0mm 91% 0cm -26° 0.76°C 0mm 0.06kPa 24134m 0.9m/s 1.1m/s
03:00 ☾
0% -0.4°C 0mm 90% 0cm -24° 0.96°C 0mm 0.06kPa 24135m 0.9m/s 0.99m/s
04:00 ☾
0% -1.6°C 0mm 90% 0cm -20° -0.09°C 0mm 0.06kPa 24134m 0.92m/s 1m/s
05:00 ☾
0% -1.6°C 0mm 90% 0cm -13° -0.17°C 0mm 0.06kPa 24134m 1.2m/s 1.3m/s
06:00 ☾
0% -1.6°C 0mm 90% 0cm -5.5° -0.19°C 0.06mm 0.06kPa 24135m 1m/s 1.1m/s
07:00
0% -1°C 0mm 90% 0cm 3.3° 0.53°C 0.06mm 0.07kPa 13854m 0.81m/s 1.1m/s
08:00
0% 0.1°C 0mm 85% 0cm 12° 2.3°C 0.06mm 0.11kPa 24135m 1.4m/s 1.4m/s
09:00
0% 0.7°C 0mm 80% 0cm 22° 3.9°C 0.06mm 0.16kPa 24135m 2.1m/s 2m/s
10:00
0% 1.6°C 0mm 78% 0cm 31° 5°C 0.06mm 0.19kPa 24135m 2m/s 2m/s
11:00
0% 1.8°C 0mm 78% 0cm 39° 5.4°C 0.06mm 0.2kPa 24134m 1.9m/s 1.8m/s
12:00
0% 2.4°C 0mm 76% 0cm 46° 6.4°C 0.13mm 0.24kPa 9532m 1.8m/s 2m/s
13:00
0% 2.2°C 0.04mm 80% 0cm 50° 5.3°C 0.13mm 0.18kPa 12997m 2.1m/s 2.3m/s
14:00
0% 2.2°C 0.29mm 90% 0cm 51° 3.7°C 0.38mm 0.08kPa 2347m 2.3m/s 2.2m/s
15:00
0% 2°C 0.6mm 96% 0cm 48° 2.6°C 1.1mm 0.03kPa 158m 2.5m/s 2.1m/s
16:00
0% 2.1°C 0.96mm 97% 1cm 42° 2.5°C 2mm 0.02kPa 50m 2.3m/s 1.9m/s
17:00
0% 1.7°C 1.4mm 99% 1.4cm 34° 1.8°C 3.4mm 0.01kPa 35m 2.5m/s 2.2m/s
18:00 ☾
0% 1.1°C 1.1mm 99% 1.2cm 26° 1.2°C 4.6mm 0.01kPa 52m 1.3m/s 1.2m/s
19:00 ☾
0% 1°C 1.5mm 100% 1.6cm 16° 1.1°C 1.4mm 0kPa 25m 1.9m/s 1.7m/s
20:00 ☾
0% 0.4°C 0.84mm 100% 0.95cm 7.1° 0.49°C 2.6mm 0kPa 29m 2.2m/s 2m/s
21:00 ☾
0% 0°C 0.24mm 99% 0.6cm -1.8° 0.18°C 3.3mm 0.01kPa 45m 2.7m/s 2.1m/s
22:00 ☾
0% -0.8°C 0.1mm 98% 0cm -10° -0.59°C 3.7mm 0.01kPa 867m 2.5m/s 2.1m/s
23:00 ☾
0% -2.4°C 0.01mm 97% 0.06cm -17° -2°C 3.9mm 0.02kPa 3881m 2.3m/s 2.2m/s
Thu, Apr 23 Sunrise 06:31 Sunset 20:53
24:00 ☾
0% -3.3°C 0.17mm 95% 0.21cm -22° -2.6°C 4mm 0.02kPa 471m 3.6m/s 3.1m/s
01:00 ☾
0% -4.8°C 0.39mm 93% 0.39cm -26° -3.8°C 0.5mm 0.03kPa 516m 4.3m/s 3.4m/s
02:00 ☾
0% -5.9°C 0.39mm 88% 0.39cm -26° -4.3°C 0.81mm 0.05kPa 2017m 3.4m/s 2.5m/s
03:00 ☾
0% -5.9°C 0.4mm 92% 0.41cm -24° -4.8°C 1.3mm 0.03kPa 559m 3.5m/s 2.3m/s
04:00 ☾
0% -6.3°C 0.24mm 91% 0.25cm -19° -5.1°C 1.6mm 0.04kPa 511m 3.3m/s 2.2m/s
05:00 ☾
0% -6.7°C 0.11mm 91% 0.12cm -13° -5.5°C 1.8mm 0.04kPa 634m 3.4m/s 2.2m/s
06:00 ☾
0% -7.3°C 0.02mm 87% 0cm -5.2° -5.5°C 1.9mm 0.05kPa 6770m 3.4m/s 2m/s
07:00
2% -8.4°C 0mm 86% 0cm 3.6° -6.4°C 0mm 0.05kPa 24135m 2.2m/s 2m/s
08:00
4% -9.5°C 0mm 75% 0cm 13° -5.7°C 0mm 0.1kPa 24135m 3.2m/s 2.4m/s
09:00
6% -11°C 0mm 64% 0cm 22° -4.9°C 0mm 0.15kPa 24134m 3.7m/s 2.6m/s
10:00
6% -11°C 0mm 56% 0cm 31° -4.1°C 0mm 0.2kPa 24135m 3.7m/s 2.7m/s
11:00
5% -12°C 0mm 52% 0cm 39° -3.4°C 0mm 0.23kPa 24109m 3.3m/s 2.5m/s
12:00
5% -12°C 0mm 50% 0cm 46° -2.7°C 0.06mm 0.25kPa 14262m 3.2m/s 2.5m/s
13:00
3% -11°C 0mm 50% 0.04cm 51° -2.4°C 0mm 0.26kPa 10033m 3.8m/s 2.5m/s
14:00
2% -11°C 0.01mm 51% 0.05cm 51° -2°C 0.06mm 0.26kPa 9789m 3.8m/s 2.5m/s
15:00
0% -11°C 0mm 50% 0cm 48° -1.8°C 0.13mm 0.26kPa 23676m 3.8m/s 2.4m/s
16:00
0% -11°C 0mm 50% 0.06cm 42° -1.4°C 0.19mm 0.28kPa 8248m 3.6m/s 2.3m/s
17:00
0% -10°C 0.03mm 51% 0.11cm 35° -1.8°C 0.25mm 0.26kPa 5250m 3.3m/s 2.2m/s
18:00 ☾
0% -9.5°C 0.02mm 60% 0.31cm 26° -2.7°C 0.44mm 0.2kPa 1469m 2.8m/s 2.1m/s
19:00 ☾
0% -11°C 0.01mm 64% 0.21cm 17° -5.1°C 0.31mm 0.15kPa 9024m 3.2m/s 2.3m/s
20:00 ☾
0% -12°C 0.007mm 68% 0.1cm 7.3° -7.6°C 0.19mm 0.11kPa 16580m 3.7m/s 2.5m/s
21:00 ☾
0% -14°C 0mm 72% 0cm -1.6° -10°C 0.06mm 0.08kPa 24135m 4.1m/s 2.7m/s
22:00 ☾
0% -14°C 0.003mm 75% 0cm -9.9° -10°C 0.08mm 0.07kPa 23423m 4.1m/s 2.7m/s
23:00 ☾
0% -14°C 0.007mm 77% 0cm -17° -11°C 0.1mm 0.06kPa 22711m 4m/s 2.7m/s
Fri, Apr 24 Sunrise 06:29 Sunset 20:54
24:00 ☾
0% -14°C 0.01mm 80% 0cm -22° -11°C 0.13mm 0.05kPa 21999m 3.9m/s 2.7m/s
01:00 ☾
2% -15°C 0.01mm 72% 0cm -25° -11°C 0.08mm 0.08kPa 22451m 4.4m/s 2.9m/s
02:00 ☾
5% -16°C 0.02mm 64% 0cm -26° -10°C 0.04mm 0.1kPa 22903m 4.9m/s 3.1m/s
03:00 ☾
7% -17°C 0.02mm 56% 0cm -24° -9.6°C 0mm 0.13kPa 23355m 5.4m/s 3.3m/s
04:00 ☾
7% -17°C 0.01mm 52% 0cm -19° -8.8°C 0.02mm 0.15kPa 22912m 5.6m/s 3.3m/s
05:00 ☾
8% -17°C 0.007mm 48% 0cm -13° -8.1°C 0.04mm 0.17kPa 22468m 5.8m/s 3.4m/s
06:00 ☾
8% -17°C 0mm 44% 0cm -4.9° -7.3°C 0.06mm 0.2kPa 22025m 6m/s 3.5m/s
07:00
17% -17°C 0mm 46% 0.02cm 3.9° -7°C 0.08mm 0.2kPa 18792m 5.9m/s 3.5m/s
08:00
26% -16°C 0mm 47% 0.03cm 13° -6.6°C 0.1mm 0.2kPa 15559m 5.8m/s 3.6m/s
09:00
35% -15°C 0mm 48% 0.05cm 22° -6.2°C 0.13mm 0.2kPa 12326m 5.7m/s 3.6m/s
10:00
32% -15°C 0.01mm 49% 0.05cm 31° -6.2°C 0.19mm 0.2kPa 12177m 5.8m/s 3.6m/s
11:00
30% -15°C 0.02mm 49% 0.06cm 40° -6.2°C 0.25mm 0.19kPa 12028m 5.8m/s 3.5m/s
12:00
27% -15°C 0.03mm 50% 0.06cm 47° -6.1°C 0.31mm 0.19kPa 11879m 5.9m/s 3.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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