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Rule Fog Hunter

Banff - Fog Hunter - Canadian Rockies

Banff, Alberta, Canada

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread8.2°C
Visibility24135 (Clear)
Relative Humidity55%
Wind Speed1.0m/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
Banff
Today · 22:00–23:00 · 1h window
Medium confidence
51%
🌫️Fog Probability64.7%
Dewpoint Spread: 0.1°C
Visibility: 51 (Dense fog)
Relative Humidity: 99%
Wind Speed: 1.6m/s (calm conditions)
fog weather icon
Moderate Fog
Banff
Tomorrow · 01:00–02:00
🌫️Fog Probability:60.7%
Medium
fog weather icon
Dense Fog
Banff
Tomorrow · 23:00–24:00
🌫️Fog Probability:96%
High
fog weather icon
Moderate Fog
Banff
Mon, Apr 13 · 04:00–06:00
🌫️Fog Probability:61.4-68%
Low
fog weather icon
Moderate Fog at Sunrise
Banff
Mon, Apr 13 · 06:00–08:00
🌫️Fog Probability:78.4%
High
fog weather icon
Moderate Fog
Banff
Mon, Apr 13 · 21:00–22:00
🌫️Fog Probability:69.4%
Medium
fog weather icon
Dense Fog
Banff
Wed, Apr 15 · 20:00–01:00
🌫️Fog Probability:62.7-100%
High
+1 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
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%
21:0059%
22:0065%
23:000%
Sun, Apr 12
24:000%
01:0061%
02:000%
03:000%
04:000%
05:000%
06:000%
07:0036%
08:0020%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:0055%
22:0055%
23:0096%
Mon, Apr 13
24:0045%
01:0045%
02:0055%
03:0045%
04:0068%
05:0061%
06:0078%
07:0078%
08:0043%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:0069%
22:0024%
23:000%
Tue, Apr 14
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
Sat, Apr 11 Sunrise 06:55 Sunset 20:30
13:00 ☾
0% -2.6°C 0mm 55% 0cm 46° 5.6°C 0mm 0.41kPa 24135m 1.3m/s 1m/s
14:00 ☾
0% -2.4°C 0mm 49% 0cm 47° 7.5°C 0mm 0.53kPa 24134m 1.7m/s 1.1m/s
15:00 ☾
0% -2.7°C 0mm 48% 0cm 45° 7.7°C 0mm 0.55kPa 24134m 2m/s 1.2m/s
16:00 ☾
0% -2.2°C 0mm 49% 0cm 39° 7.8°C 0mm 0.54kPa 24032m 2.2m/s 1.3m/s
17:00 ☾
0% -1.9°C 0mm 53% 0cm 31° 7°C 0mm 0.47kPa 23786m 1.6m/s 1.3m/s
18:00 ☾
0% -0.6°C 0.01mm 61% 0cm 23° 6.3°C 0.06mm 0.37kPa 23459m 1.5m/s 1.2m/s
19:00 ☾
0% 1.1°C 0mm 77% 0cm 14° 4.9°C 0.06mm 0.2kPa 17842m 1.4m/s 1.1m/s
20:00 ☾
0% 0.7°C 0.05mm 93% 0cm 4.3° 1.8°C 0.19mm 0.05kPa 15857m 1.3m/s 1.5m/s
21:00 ☾
0% 0.2°C 0.28mm 98% 0cm -4.9° 0.47°C 0.38mm 0.01kPa 444m 1.9m/s 1.8m/s
22:00 ☾
0% -0.1°C 0.41mm 99% 0cm -13° 0.02°C 0.75mm 0kPa 51m 1.9m/s 1.6m/s
23:00 ☾
0% 0.1°C 0.7mm 100% 0.7cm -21° 0.22°C 1.3mm 0kPa 25m 2.1m/s 1.6m/s
Sun, Apr 12 Sunrise 06:53 Sunset 20:31
24:00 ☾
0% -0.3°C 0.82mm 99% 0.82cm -26° -0.15°C 2.1mm 0kPa 29m 2.4m/s 2m/s
01:00 ☾
0% -1°C 0.64mm 98% 0.64cm -29° -0.76°C 0.75mm 0.01kPa 44m 2.6m/s 2.3m/s
02:00 ☾
0% -2.2°C 0.43mm 97% 0.44cm -30° -1.8°C 1.3mm 0.01kPa 105m 2.6m/s 2.3m/s
03:00 ☾
0% -3.3°C 0.16mm 95% 0.16cm -28° -2.6°C 1.6mm 0.02kPa 579m 2.3m/s 2.1m/s
04:00 ☾
0% -3.7°C 0.12mm 96% 0.12cm -23° -3.1°C 1.7mm 0.02kPa 864m 2.2m/s 1.9m/s
05:00 ☾
0% -4°C 0.16mm 96% 0.16cm -17° -3.4°C 1.8mm 0.02kPa 399m 2.3m/s 1.9m/s
06:00 ☾
0% -4.4°C 0.17mm 95% 0.17cm -8.6° -3.7°C 1.9mm 0.02kPa 401m 2.3m/s 2m/s
07:00 ☾
0% -4.9°C 0.2mm 95% 0.2cm 0.66° -4.2°C 0.19mm 0.02kPa 280m 2.2m/s 2m/s
08:00 ☾
0% -5.4°C 0.12mm 91% 0.12cm 9.6° -4.1°C 0.38mm 0.04kPa 543m 2.3m/s 2.1m/s
09:00 ☾
0% -5.7°C 0.06mm 85% 0.06cm 19° -3.6°C 0.44mm 0.07kPa 3164m 2.1m/s 2m/s
10:00 ☾
0% -5.7°C 0.05mm 81% 0.06cm 28° -2.9°C 0.5mm 0.1kPa 8930m 2.1m/s 2.1m/s
11:00 ☾
0% -5.3°C 0.08mm 80% 0.09cm 36° -2.3°C 0.56mm 0.1kPa 6206m 2.1m/s 2.3m/s
12:00 ☾
0% -4.8°C 0.06mm 79% 0.07cm 43° -1.5°C 0.63mm 0.12kPa 13658m 2.1m/s 2.4m/s
13:00 ☾
0% -4.4°C 0.04mm 76% 0.05cm 47° -0.65°C 0.06mm 0.14kPa 19870m 2m/s 2.5m/s
14:00 ☾
0% -4.3°C 0.04mm 76% 0.05cm 48° -0.57°C 0.13mm 0.14kPa 23584m 1.9m/s 2.6m/s
15:00 ☾
0% -4.1°C 0.03mm 77% 0cm 45° -0.65°C 0.13mm 0.13kPa 23782m 1.6m/s 2.4m/s
16:00 ☾
0% -3.9°C 0.02mm 78% 0.02cm 39° -0.55°C 0.19mm 0.13kPa 24135m 1.5m/s 2.3m/s
17:00 ☾
0% -3.9°C 0.01mm 79% 0cm 32° -0.78°C 0.19mm 0.12kPa 23943m 1.5m/s 2.1m/s
18:00 ☾
0% -3.8°C 0.01mm 81% 0cm 23° -0.94°C 0.19mm 0.11kPa 24135m 1.4m/s 2m/s
19:00 ☾
0% -3.6°C 0.05mm 85% 0.05cm 14° -1.5°C 0mm 0.08kPa 7052m 1.5m/s 1.8m/s
20:00 ☾
0% -3.6°C 0.06mm 91% 0.06cm 4.5° -2.3°C 0.06mm 0.05kPa 4950m 1.8m/s 1.8m/s
21:00 ☾
0% -3.7°C 0.05mm 94% 0.05cm -4.7° -2.9°C 0.19mm 0.03kPa 2473m 1.5m/s 1.5m/s
22:00 ☾
0% -3.9°C 0.01mm 95% 0cm -13° -3.2°C 0.19mm 0.02kPa 11559m 1.2m/s 1.1m/s
23:00 ☾
0% -4.3°C 0.01mm 98% 0cm -20° -4°C 0.19mm 0.01kPa 5142m 1m/s 1m/s
Mon, Apr 13 Sunrise 06:51 Sunset 20:33
24:00 ☾
0% -4.1°C 0.02mm 94% 0cm -26° -3.4°C 0.19mm 0.03kPa 3418m 0.9m/s 1m/s
01:00 ☾
0% -4.1°C 0.02mm 94% 0cm -29° -3.3°C 0mm 0.03kPa 4188m 0.9m/s 1m/s
02:00 ☾
1% -3.9°C 0.03mm 94% 0cm -30° -3°C 0.06mm 0.03kPa 1942m 1.2m/s 1.1m/s
03:00 ☾
1% -3.6°C 0.01mm 94% 0cm -27° -2.7°C 0.06mm 0.03kPa 6404m 0.51m/s 0.36m/s
04:00 ☾
1% -3.7°C 0mm 96% 0cm -23° -3.1°C 0.06mm 0.02kPa 10914m 1.1m/s 0.8m/s
05:00 ☾
1% -3.2°C 0mm 95% 0cm -16° -2.6°C 0.06mm 0.02kPa 23561m 1.4m/s 1.2m/s
06:00 ☾
1% -2.5°C 0mm 96% 0cm -8.3° -2°C 0.06mm 0.02kPa 24135m 1.6m/s 1.3m/s
07:00 ☾
2% -2.1°C 0mm 97% 0cm 0.95° -1.7°C 0mm 0.02kPa 24135m 1.6m/s 1.5m/s
08:00 ☾
2% -1.7°C 0mm 93% 0cm 9.9° -0.75°C 0mm 0.04kPa 24135m 2m/s 1.7m/s
09:00 ☾
3% -1.7°C 0mm 86% 0cm 19° 0.42°C 0mm 0.09kPa 24134m 2.4m/s 2m/s
10:00 ☾
2% -1.7°C 0mm 76% 0cm 28° 2°C 0mm 0.17kPa 24134m 2.6m/s 2.3m/s
11:00 ☾
1% -2.1°C 0mm 68% 0cm 36° 3.3°C 0mm 0.25kPa 21140m 2.8m/s 2.4m/s
12:00 ☾
0% -2.4°C 0.01mm 63% 0.02cm 43° 4°C 0mm 0.3kPa 18973m 3.1m/s 2.6m/s
13:00 ☾
0% -2.5°C 0mm 61% 0cm 47° 4.2°C 0mm 0.32kPa 20720m 3.6m/s 3.1m/s
14:00 ☾
0% -2.4°C 0mm 63% 0.01cm 48° 4°C 0mm 0.3kPa 17210m 3.3m/s 3m/s
15:00 ☾
0% -2.8°C 0mm 62% 0cm 45° 3.9°C 0mm 0.31kPa 24134m 3.8m/s 2.9m/s
16:00 ☾
0% -2.6°C 0mm 64% 0cm 40° 3.6°C 0.06mm 0.28kPa 24135m 3.9m/s 2.5m/s
17:00 ☾
0% -2.4°C 0mm 65% 0cm 32° 3.4°C 0.06mm 0.27kPa 24135m 3.5m/s 2.4m/s
18:00 ☾
0% -2.2°C 0mm 66% 0cm 23° 3.7°C 0.06mm 0.27kPa 24134m 3.3m/s 2.2m/s
19:00 ☾
0% -2.3°C 0mm 76% 0cm 14° 1.5°C 0.1mm 0.16kPa 18875m 3m/s 2.3m/s
20:00 ☾
0% -2.8°C 0mm 86% 0cm 4.8° -0.74°C 0.15mm 0.08kPa 13615m 2.7m/s 2.5m/s
21:00 ☾
0% -3.4°C 0mm 96% 0cm -4.4° -3°C 0.19mm 0.02kPa 8356m 2.4m/s 2.6m/s
22:00 ☾
0% -3.6°C 0.03mm 93% 0cm -13° -2.6°C 0.27mm 0.04kPa 9397m 2.5m/s 2.4m/s
23:00 ☾
0% -3.8°C 0.07mm 89% 0cm -20° -2.3°C 0.35mm 0.06kPa 10439m 2.6m/s 2.3m/s
Tue, Apr 14 Sunrise 06:49 Sunset 20:35
24:00 ☾
0% -4°C 0.1mm 86% 0cm -25° -1.9°C 0.44mm 0.08kPa 11481m 2.7m/s 2.1m/s
01:00 ☾
0% -3.7°C 0.11mm 85% 0cm -29° -1.5°C 0.6mm 0.08kPa 12799m 2.6m/s 1.9m/s
02:00 ☾
0% -3.3°C 0.11mm 85% 0cm -29° -1.1°C 0.77mm 0.08kPa 14118m 2.6m/s 1.7m/s
03:00 ☾
0% -2.9°C 0.12mm 85% 0cm -27° -0.66°C 0.94mm 0.09kPa 15436m 2.5m/s 1.4m/s
04:00 ☾
0% -3.7°C 0.12mm 77% 0.05cm -22° -0.16°C 1.3mm 0.14kPa 12695m 4.4m/s 2.1m/s
05:00 ☾
0% -4.6°C 0.13mm 70% 0.11cm -16° 0.34°C 1.6mm 0.19kPa 9954m 6.2m/s 2.8m/s
06:00 ☾
0% -5.6°C 0.13mm 62% 0.16cm -7.9° 0.83°C 2mm 0.25kPa 7212m 8.1m/s 3.5m/s
07:00 ☾
0% -5.6°C 0.11mm 62% 0.19cm 1.2° 0.93°C 1.5mm 0.25kPa 8162m 8.9m/s 3.7m/s
08:00 ☾
0% -5.6°C 0.08mm 61% 0.22cm 10° 1°C 1mm 0.26kPa 9111m 9.7m/s 4m/s
09:00 ☾
0% -5.6°C 0.06mm 61% 0.25cm 20° 1.1°C 0.56mm 0.26kPa 10060m 11m/s 4.2m/s
10:00 ☾
0% -5.9°C 0.17mm 61% 0.17cm 29° 0.74°C 0.85mm 0.25kPa 13491m 8.1m/s 3.4m/s
11:00 ☾
0% -6.2°C 0.29mm 61% 0.08cm 37° 0.37°C 1.1mm 0.24kPa 16921m 5.7m/s 2.7m/s
12:00 ☾
0% -6.5°C 0.4mm 62% 0cm 43° 0.003°C 1.4mm 0.23kPa 20352m 3.3m/s 2m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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