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Rule Fog Hunter

Nordegg - Fog Hunter - Canadian Rockies

Nordegg, Alberta, Canada

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
100%
Dewpoint Spread0.2°C
Visibility12897 (Clear)
Relative Humidity99%
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
Dense Fog
Nordegg
Today · 01:00–06:00 · 5h window
High confidence
100%
🌫️Fog Probability98.5-100%
Dewpoint Spread: 0.2°C
Visibility: 12897 (Clear)
Relative Humidity: 99%
Wind Speed: 1.3m/s (calm conditions)
fog weather icon
Dense Fog at Sunrise
Nordegg
Today · 06:00–08:00
🌫️Fog Probability:100%
High
fog weather icon
Moderate Fog
Nordegg
Today · 08:00–09:00
🌫️Fog Probability:79.7%
Medium
fog weather icon
Dense Fog
Nordegg
Today · 20:00–03:00
🌫️Fog Probability:61.4-93.6%
High
fog weather icon
Dense Fog
Nordegg
Tomorrow · 20:00–06:00
🌫️Fog Probability:78.4-97.3%
High
fog weather icon
Dense Fog at Sunrise
Nordegg
Sat, Apr 11 · 06:00–08:00
🌫️Fog Probability:89.8-100%
High
fog weather icon
Moderate Fog
Nordegg
Sat, Apr 11 · 08:00–09:00
🌫️Fog Probability:69.3%
Medium
+5 more windows in the next 10 days

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
36matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 60.0%
Wed, Apr 8
01:0080%
02:00100%
03:00100%
04:00100%
05:00100%
06:0095%
07:0080%
08:0046%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:0014%
19:0032%
20:0061%
21:000%
22:000%
23:000%
Thu, Apr 9
24:000%
01:00100%
02:0099%
03:00100%
04:00100%
05:00100%
06:00100%
07:00100%
08:0080%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0043%
20:0089%
21:0084%
22:0094%
23:0089%
Fri, Apr 10
24:0089%
01:0078%
02:0061%
03:0046%
04:0046%
05:0046%
06:0046%
07:0046%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0089%
21:0078%
22:0078%
23:0078%
Sat, Apr 11
24:0078%
01:0089%
02:0078%
03:0084%
04:0089%
05:0097%
06:00100%
07:0090%
08:0069%
09:0058%
10:0048%
11:0052%
12:0054%
13:0040%
14:0046%
15:0053%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
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
Thu, Apr 9 Sunrise 06:59 Sunset 20:30
01:00 ☾
0% -5.4°C 0mm 99% 0cm -29° -5.2°C 0.06mm 0kPa 12897m 1.2m/s 1.3m/s
02:00 ☾
0% -7.4°C 0mm 99% 0cm -30° -7.2°C 0.06mm 0kPa 10037m 1.1m/s 1.3m/s
03:00 ☾
0% -9.1°C 0mm 99% 0cm -28° -9°C 0.06mm 0kPa 7990m 1.1m/s 1.4m/s
04:00 ☾
1% -11°C 0mm 99% 0cm -23° -11°C 0.06mm 0kPa 6879m 1.2m/s 1.5m/s
05:00 ☾
1% -11°C 0mm 99% 0cm -17° -11°C 0.06mm 0kPa 6617m 1.3m/s 1.7m/s
06:00 ☾
2% -12°C 0mm 99% 0cm -9.2° -12°C 0.06mm 0kPa 6603m 1.3m/s 1.7m/s
07:00 ☾
12% -12°C 0mm 99% 0cm -0.16° -12°C 0mm 0kPa 6587m 1.3m/s 1.8m/s
08:00 ☾
22% -8.8°C 0mm 97% 0cm 8.5° -8.4°C 0mm 0.01kPa 11615m 1.1m/s 1.5m/s
09:00 ☾
32% -5.1°C 0mm 91% 0cm 18° -3.9°C 0mm 0.04kPa 24135m 1.2m/s 0.99m/s
10:00 ☾
27% -3.2°C 0mm 86% 0cm 26° -1.3°C 0mm 0.08kPa 24134m 1.3m/s 0.93m/s
11:00 ☾
23% -2.8°C 0mm 83% 0cm 34° -0.26°C 0mm 0.1kPa 24135m 2m/s 1.4m/s
12:00 ☾
18% -2°C 0mm 83% 0cm 40° 0.53°C 0mm 0.11kPa 23847m 2.3m/s 1.6m/s
13:00 ☾
12% -1.3°C 0mm 83% 0.03cm 44° 1.3°C 0mm 0.11kPa 12414m 2.4m/s 1.6m/s
14:00 ☾
6% -0.9°C 0mm 83% 0cm 45° 1.7°C 0.06mm 0.12kPa 23965m 2.3m/s 1.7m/s
15:00 ☾
0% 0°C 0mm 84% 0cm 43° 2.5°C 0.06mm 0.12kPa 23972m 2.1m/s 1.8m/s
16:00 ☾
0% 0.6°C 0mm 84% 0.02cm 38° 2.9°C 0.06mm 0.12kPa 24134m 2m/s 1.8m/s
17:00 ☾
0% 0.6°C 0mm 85% 0cm 30° 2.9°C 0.06mm 0.11kPa 24135m 2.1m/s 1.8m/s
18:00 ☾
0% 0.9°C 0mm 88% 0cm 22° 2.7°C 0.06mm 0.09kPa 24028m 2m/s 1.6m/s
19:00 ☾
16% 1.2°C 0mm 94% 0cm 13° 2.2°C 0mm 0.05kPa 24135m 2.5m/s 1.4m/s
20:00 ☾
31% 0.5°C 0mm 98% 0cm 4.2° 0.84°C 0mm 0.01kPa 24135m 1m/s 1.1m/s
21:00 ☾
47% -1.1°C 0mm 97% 0cm -4.8° -0.7°C 0mm 0.02kPa 24135m 1.7m/s 1.4m/s
22:00 ☾
50% -4.9°C 0mm 98% 0cm -13° -4.6°C 0mm 0.01kPa 24134m 1.5m/s 1.8m/s
23:00 ☾
54% -5.7°C 0mm 98% 0cm -20° -5.3°C 0mm 0.01kPa 24022m 1.6m/s 2m/s
Fri, Apr 10 Sunrise 06:56 Sunset 20:31
24:00 ☾
57% -5.9°C 0mm 97% 0cm -26° -5.5°C 0mm 0.01kPa 24135m 1.6m/s 2.1m/s
01:00 ☾
57% -6.5°C 0mm 96% 0cm -29° -6°C 0mm 0.01kPa 24134m 1.6m/s 2.1m/s
02:00 ☾
56% -7°C 0mm 95% 0cm -29° -6.4°C 0mm 0.02kPa 24134m 1.6m/s 2.2m/s
03:00 ☾
56% -7.4°C 0mm 94% 0cm -27° -6.6°C 0mm 0.02kPa 24135m 1.6m/s 2.3m/s
04:00 ☾
51% -7.4°C 0mm 93% 0cm -23° -6.5°C 0mm 0.02kPa 24135m 1.6m/s 2.2m/s
05:00 ☾
45% -7.4°C 0mm 93% 0cm -17° -6.6°C 0mm 0.02kPa 24135m 1.6m/s 2.2m/s
06:00 ☾
40% -7.6°C 0mm 94% 0cm -8.9° -6.8°C 0mm 0.02kPa 24135m 1.6m/s 2.2m/s
07:00 ☾
34% -7.8°C 0mm 94% 0cm 0.21° -6.9°C 0mm 0.02kPa 24135m 1.6m/s 2.3m/s
08:00 ☾
27% -5.9°C 0mm 90% 0cm 8.8° -4.5°C 0mm 0.04kPa 24134m 2.2m/s 2.1m/s
09:00 ☾
21% -3°C 0mm 82% 0cm 18° -0.35°C 0mm 0.1kPa 24135m 2m/s 1.6m/s
10:00 ☾
22% -0.8°C 0mm 82% 0cm 27° 2°C 0mm 0.13kPa 24134m 1.9m/s 1.4m/s
11:00 ☾
22% 0.6°C 0mm 79% 0cm 34° 4°C 0mm 0.17kPa 24135m 1.6m/s 1.1m/s
12:00 ☾
23% 1.6°C 0mm 75% 0cm 41° 5.7°C 0mm 0.23kPa 24134m 1.2m/s 0.6m/s
13:00 ☾
28% 2.1°C 0mm 71% 0cm 45° 6.9°C 0mm 0.29kPa 24135m 1m/s 0.5m/s
14:00 ☾
33% 2.5°C 0mm 69% 0cm 46° 7.8°C 0mm 0.33kPa 24135m 1m/s 0.82m/s
15:00 ☾
38% 2.6°C 0mm 68% 0cm 43° 8.1°C 0mm 0.35kPa 24134m 1.1m/s 1.1m/s
16:00 ☾
41% 2.7°C 0mm 69% 0cm 38° 8.1°C 0mm 0.34kPa 24135m 1.1m/s 1.4m/s
17:00 ☾
43% 2.9°C 0mm 71% 0cm 31° 7.9°C 0mm 0.31kPa 24135m 1.3m/s 1.6m/s
18:00 ☾
46% 4.1°C 0mm 79% 0cm 22° 7.5°C 0mm 0.22kPa 24134m 1.9m/s 1.5m/s
19:00 ☾
42% 4.7°C 0mm 90% 0cm 13° 6.2°C 0mm 0.1kPa 24135m 1.7m/s 1.3m/s
20:00 ☾
39% 1.9°C 0mm 97% 0cm 4.4° 2.3°C 0mm 0.02kPa 24134m 0.7m/s 0.77m/s
21:00 ☾
35% -1.5°C 0mm 96% 0cm -4.5° -1.1°C 0mm 0.02kPa 24135m 0.41m/s 0.38m/s
22:00 ☾
28% -2.5°C 0mm 96% 0cm -13° -2°C 0mm 0.02kPa 24134m 0.61m/s 0.82m/s
23:00 ☾
22% -2.8°C 0mm 97% 0cm -20° -2.4°C 0mm 0.02kPa 24135m 0.8m/s 1m/s
Sat, Apr 11 Sunrise 06:54 Sunset 20:33
24:00 ☾
15% -2.6°C 0mm 97% 0cm -25° -2.1°C 0mm 0.02kPa 24135m 0.91m/s 1.1m/s
01:00 ☾
11% -1.8°C 0mm 97% 0cm -28° -1.4°C 0mm 0.02kPa 24134m 0.82m/s 1m/s
02:00 ☾
8% -0.9°C 0mm 96% 0cm -29° -0.42°C 0mm 0.02kPa 24134m 0.81m/s 0.86m/s
03:00 ☾
4% -0.5°C 0mm 97% 0cm -27° -0.1°C 0mm 0.02kPa 24134m 0.62m/s 0.76m/s
04:00 ☾
4% -0.7°C 0mm 98% 0cm -23° -0.35°C 0mm 0.01kPa 24135m 0.31m/s 0.38m/s
05:00 ☾
3% -0.5°C 0mm 98% 0cm -16° -0.21°C 0mm 0.01kPa 24135m 0.91m/s 0.98m/s
06:00 ☾
3% -0.6°C 0mm 99% 0cm -8.5° -0.41°C 0mm 0.01kPa 22182m 1m/s 1.1m/s
07:00 ☾
2% -0.1°C 0.003mm 98% 0cm 0.49° 0.25°C 0.02mm 0.01kPa 14969m 1.1m/s 1.2m/s
08:00 ☾
1% 0.4°C 0.007mm 97% 0cm 9.1° 0.92°C 0.04mm 0.02kPa 7756m 1.2m/s 1.3m/s
09:00 ☾
0% 0.9°C 0.01mm 96% 0cm 18° 1.6°C 0.06mm 0.03kPa 543m 1.3m/s 1.5m/s
10:00 ☾
0% 0.8°C 0.01mm 96% 0.01cm 27° 1.4°C 0.08mm 0.03kPa 3647m 1.6m/s 1.4m/s
11:00 ☾
0% 0.7°C 0.02mm 96% 0.03cm 35° 1.2°C 0.1mm 0.03kPa 6751m 1.9m/s 1.4m/s
12:00 ☾
0% 0.5°C 0.02mm 96% 0.04cm 41° 1°C 0.13mm 0.02kPa 9855m 2.1m/s 1.4m/s
13:00 ☾
0% 0.2°C 0.16mm 98% 0.18cm 45° 0.6°C 0.29mm 0.02kPa 6584m 2m/s 1.3m/s
14:00 ☾
0% 0°C 0.31mm 99% 0.31cm 46° 0.18°C 0.46mm 0.01kPa 3313m 1.8m/s 1.1m/s
15:00 ☾
0% -0.3°C 0.45mm 100% 0.45cm 43° -0.25°C 0.63mm 0kPa 42m 1.6m/s 0.94m/s
16:00 ☾
0% -0.4°C 0.48mm 100% 0.49cm 38° -0.32°C 1.1mm 0kPa 36m 2.2m/s 1.1m/s
17:00 ☾
0% -0.5°C 0.52mm 99% 0.52cm 31° -0.4°C 1.7mm 0kPa 31m 2.8m/s 1.3m/s
18:00 ☾
0% -0.6°C 0.55mm 99% 0.55cm 23° -0.48°C 2.2mm 0kPa 25m 3.3m/s 1.5m/s
19:00 ☾
0% -1.3°C 0.43mm 99% 0.43cm 14° -1.2°C 1.8mm 0.01kPa 153m 3.3m/s 1.5m/s
20:00 ☾
0% -2.1°C 0.32mm 98% 0.32cm 4.7° -1.9°C 1.5mm 0.01kPa 282m 3.2m/s 1.4m/s
21:00 ☾
0% -2.9°C 0.2mm 98% 0.2cm -4.3° -2.6°C 1.1mm 0.01kPa 410m 3.1m/s 1.3m/s
22:00 ☾
0% -3.4°C 0.16mm 98% 0.16cm -12° -3.1°C 1.3mm 0.01kPa 482m 2.8m/s 1.3m/s
23:00 ☾
0% -3.9°C 0.12mm 98% 0.12cm -19° -3.6°C 1.5mm 0.01kPa 554m 2.4m/s 1.2m/s
Sun, Apr 12 Sunrise 06:52 Sunset 20:35
24:00 ☾
0% -4.4°C 0.08mm 98% 0.08cm -25° -4.2°C 1.6mm 0.01kPa 627m 2m/s 1.2m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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