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Rule Fog Hunter

Nordegg - Fog Hunter - Canadian Rockies

Nordegg, 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 Spread1.5°C
Visibility24134 (Clear)
Relative Humidity89%
Wind Speed1.6m/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 81 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 75.0%
Sun, May 17
22:000%
23:000%
Mon, May 18
24:000%
01:0071%
02:0071%
03:0055%
04:0039%
05:0041%
06:0041%
07:0055%
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 19
24:000%
01:0055%
02:0055%
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 20
24:000%
01:0048%
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, May 21
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
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
Mon, May 18 Sunrise 05:43 Sunset 21:37
08:00
50% 1°C 0mm 89% 0cm 19° 2.5°C 0mm 0.08kPa 24134m 2.1m/s 1.6m/s
09:00
52% 1.7°C 0mm 81% 0cm 28° 4.6°C 0mm 0.16kPa 20841m 1.9m/s 1.3m/s
10:00
44% 2.2°C 0mm 72% 0cm 37° 6.9°C 0.31mm 0.28kPa 19136m 1.5m/s 0.93m/s
11:00
35% 1.3°C 0mm 63% 0cm 45° 8°C 0.69mm 0.4kPa 13988m 3m/s 1.2m/s
12:00
27% 1.2°C 0mm 60% 0cm 52° 8.5°C 1mm 0.44kPa 13811m 3.1m/s 1.5m/s
13:00
18% 2°C 0mm 60% 0cm 56° 9.5°C 0.5mm 0.48kPa 19467m 2.9m/s 1.1m/s
14:00
9% 1.5°C 0mm 51% 0cm 57° 11°C 0.69mm 0.65kPa 24135m 3.3m/s 0.65m/s
15:00
0% 0°C 0mm 46% 0cm 54° 11°C 0.81mm 0.72kPa 24135m 3.2m/s 1.1m/s
16:00
0% -0.5°C 0mm 45% 0cm 47° 11°C 1mm 0.73kPa 24134m 2.9m/s 1.2m/s
17:00
0% -0.5°C 0mm 42% 0cm 40° 12°C 1mm 0.81kPa 24134m 3.3m/s 0.5m/s
18:00 ☾
0% -1.8°C 0mm 39% 0cm 31° 11°C 1mm 0.82kPa 24134m 2.9m/s 0.23m/s
19:00 ☾
0% -0.8°C 0mm 44% 0cm 22° 11°C 0mm 0.75kPa 24134m 2.8m/s 0.27m/s
20:00 ☾
0% 2.4°C 0mm 62% 0cm 13° 9.2°C 0.06mm 0.44kPa 15130m 1.1m/s 0.6m/s
21:00 ☾
0% 1.8°C 0mm 76% 0cm 4.3° 5.6°C 0.31mm 0.22kPa 7464m 0.8m/s 0.55m/s
22:00 ☾
0% 1.4°C 0mm 88% 0cm -3.4° 3.2°C 0.5mm 0.09kPa 24134m 0.72m/s 0.68m/s
23:00 ☾
0% 1.3°C 0mm 90% 0cm -9.8° 2.8°C 0.5mm 0.08kPa 24134m 0.61m/s 0.58m/s
Tue, May 19 Sunrise 05:41 Sunset 21:39
24:00 ☾
0% 0.9°C 0mm 93% 0cm -15° 2°C 0.5mm 0.05kPa 24134m 1.3m/s 1.4m/s
01:00 ☾
0% 0.9°C 0mm 95% 0cm -17° 1.7°C 0mm 0.04kPa 24134m 1.4m/s 1.6m/s
02:00 ☾
0% 0.9°C 0mm 95% 0cm -18° 1.7°C 0mm 0.03kPa 24135m 1.4m/s 1.6m/s
03:00 ☾
0% 1°C 0mm 93% 0cm -16° 2.1°C 0mm 0.05kPa 24135m 1.4m/s 1.6m/s
04:00 ☾
0% 0.2°C 0mm 92% 0cm -12° 1.5°C 0mm 0.06kPa 24135m 1.5m/s 1.8m/s
05:00 ☾
0% -0.1°C 0mm 89% 0cm -5.6° 1.6°C 0mm 0.08kPa 24134m 1.4m/s 1.7m/s
06:00
0% -0.7°C 0mm 88% 0cm 1.9° 1.2°C 0mm 0.08kPa 24134m 1.5m/s 1.9m/s
07:00
1% 0.2°C 0mm 86% 0cm 9.9° 2.4°C 0mm 0.1kPa 24134m 1.8m/s 1.7m/s
08:00
2% 1.3°C 0mm 80% 0cm 19° 4.5°C 0mm 0.17kPa 24134m 1.9m/s 1.5m/s
09:00
3% 1.8°C 0mm 72% 0cm 28° 6.5°C 0mm 0.27kPa 24134m 2.3m/s 1.4m/s
10:00
2% 1.9°C 0mm 62% 0cm 37° 8.9°C 0mm 0.44kPa 24135m 2.1m/s 1.2m/s
11:00
2% 1.3°C 0mm 53% 0cm 45° 11°C 0.06mm 0.6kPa 24134m 2.3m/s 1m/s
12:00
1% 1.2°C 0mm 48% 0cm 52° 12°C 0.13mm 0.73kPa 24135m 2.2m/s 0.32m/s
13:00
1% 0.9°C 0mm 45% 0cm 56° 13°C 0.06mm 0.8kPa 24134m 2.5m/s 0.59m/s
14:00
0% 1.4°C 0mm 47% 0cm 57° 12°C 0.38mm 0.75kPa 9346m 2.5m/s 0.54m/s
15:00
0% 3°C 0.08mm 60% 0cm 54° 10°C 0.81mm 0.51kPa 24135m 1.9m/s 2.1m/s
16:00
0% 3.9°C 0mm 64% 0cm 48° 10°C 1.5mm 0.46kPa 6299m 5.3m/s 3.2m/s
17:00
0% 5.6°C 0mm 86% 0cm 40° 7.9°C 2.3mm 0.15kPa 24134m 5.6m/s 3.8m/s
18:00 ☾
0% 5.1°C 0mm 86% 0cm 31° 7.4°C 2.7mm 0.15kPa 24134m 3.7m/s 2m/s
19:00 ☾
1% 4.8°C 0mm 79% 0cm 22° 8.2°C 0.75mm 0.22kPa 17419m 5.8m/s 1.8m/s
20:00 ☾
1% 3.5°C 0mm 78% 0cm 13° 7.2°C 1.2mm 0.23kPa 13202m 9.9m/s 4.8m/s
21:00 ☾
2% 2.8°C 0mm 86% 0cm 4.5° 4.9°C 1.3mm 0.12kPa 24135m 10m/s 3.5m/s
22:00 ☾
1% 1.7°C 0mm 94% 0cm -3.2° 2.6°C 1.3mm 0.04kPa 24135m 1.7m/s 1.7m/s
23:00 ☾
1% 1.2°C 0mm 94% 0cm -9.6° 2.1°C 1.3mm 0.04kPa 24135m 2.2m/s 2.1m/s
Wed, May 20 Sunrise 05:40 Sunset 21:40
24:00 ☾
0% 2.2°C 0.05mm 96% 0cm -14° 2.8°C 1.4mm 0.03kPa 17093m 2.8m/s 2.2m/s
01:00 ☾
3% 2.5°C 0.41mm 97% 0cm -17° 2.9°C 0.25mm 0.02kPa 7984m 2.9m/s 2.1m/s
02:00 ☾
5% 2.4°C 0.37mm 98% 0cm -17° 2.6°C 1mm 0.01kPa 1008m 2.7m/s 1.9m/s
03:00 ☾
8% 2.4°C 0.01mm 99% 0cm -15° 2.5°C 1.1mm 0.01kPa 457m 2.2m/s 1.2m/s
04:00 ☾
7% 2.1°C 0.11mm 98% 0.23cm -11° 2.4°C 1.4mm 0.01kPa 220m 6.6m/s 1.4m/s
05:00 ☾
7% 1.5°C 0.09mm 96% 0.18cm -5.5° 2°C 1.6mm 0.03kPa 15453m 5.1m/s 1.7m/s
06:00
6% 1.4°C 0mm 97% 0cm 2° 1.9°C 1.8mm 0.02kPa 17133m 2.9m/s 1.7m/s
07:00
6% 1.1°C 0mm 89% 0.22cm 10° 2.7°C 0.19mm 0.08kPa 17148m 1.8m/s 1.1m/s
08:00
6% 0.5°C 0mm 79% 0cm 19° 3.8°C 0.38mm 0.17kPa 24135m 10m/s 3.3m/s
09:00
6% 0°C 0mm 70% 0.05cm 28° 4.9°C 0.44mm 0.26kPa 24134m 11m/s 4.1m/s
10:00
5% -1.3°C 0mm 60% 0.1cm 37° 5.9°C 0.5mm 0.37kPa 24135m 10m/s 5.2m/s
11:00
3% -2.1°C 0mm 52% 0.22cm 45° 6.9°C 0.63mm 0.47kPa 21968m 9.6m/s 5.8m/s
12:00
2% -2.6°C 0mm 47% 0.08cm 52° 7.9°C 0.81mm 0.56kPa 23444m 9.4m/s 5.9m/s
13:00
4% -1.5°C 0.01mm 55% 0.05cm 57° 6.8°C 0.65mm 0.44kPa 23674m 6.9m/s 4.4m/s
14:00
5% -0.7°C 0.02mm 63% 0.03cm 57° 5.8°C 0.48mm 0.34kPa 23905m 4.4m/s 3m/s
15:00
7% -0.1°C 0.03mm 71% 0cm 54° 4.8°C 0.31mm 0.25kPa 24135m 1.8m/s 1.5m/s
16:00
6% -0.2°C 0.02mm 76% 0cm 48° 3.6°C 0.33mm 0.19kPa 24135m 1.7m/s 1.6m/s
17:00
4% -0.5°C 0.01mm 81% 0cm 40° 2.4°C 0.35mm 0.14kPa 24135m 1.6m/s 1.7m/s
18:00 ☾
3% -0.8°C 0mm 86% 0cm 31° 1.2°C 0.38mm 0.09kPa 24135m 1.5m/s 1.8m/s
19:00 ☾
3% -1.1°C 0mm 88% 0cm 22° 0.71°C 0.25mm 0.08kPa 24135m 1.6m/s 1.9m/s
20:00 ☾
3% -1.3°C 0mm 89% 0cm 13° 0.21°C 0.13mm 0.07kPa 24135m 1.6m/s 1.9m/s
21:00 ☾
3% -1.6°C 0mm 91% 0cm 4.7° -0.29°C 0mm 0.06kPa 24135m 1.6m/s 2m/s
22:00 ☾
3% -1.8°C 0mm 90% 0cm -3° -0.37°C 0mm 0.06kPa 24135m 1.7m/s 2.1m/s
23:00 ☾
4% -2°C 0mm 89% 0cm -9.4° -0.44°C 0mm 0.06kPa 24135m 1.7m/s 2.1m/s
Thu, May 21 Sunrise 05:38 Sunset 21:42
24:00 ☾
4% -2.2°C 0mm 88% 0cm -14° -0.51°C 0mm 0.07kPa 24135m 1.7m/s 2.2m/s
01:00 ☾
20% -1.5°C 0mm 74% 0cm -17° 2.6°C 0mm 0.19kPa 24135m 1.6m/s 1.9m/s
02:00 ☾
37% -1.3°C 0mm 61% 0cm -17° 5.7°C 0mm 0.36kPa 24135m 1.5m/s 1.6m/s
03:00 ☾
53% -2°C 0mm 47% 0cm -15° 8.8°C 0mm 0.6kPa 24135m 1.4m/s 1.2m/s
04:00 ☾
54% -2.2°C 0mm 41% 0cm -11° 11°C 0mm 0.76kPa 24135m 1.4m/s 1.1m/s
05:00 ☾
55% -2.9°C 0mm 34% 0cm -5.3° 12°C 0mm 0.95kPa 24135m 1.5m/s 1m/s
06:00
56% -4°C 0mm 28% 0cm 2.2° 14°C 0mm 1.2kPa 24135m 1.5m/s 0.96m/s
07:00
55% -3.9°C 0mm 27% 0cm 10° 15°C 0mm 1.2kPa 24135m 1.8m/s 0.67m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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