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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 Spread6.1°C
Visibility7390 (Moderate)
Relative Humidity64%
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
Banff
Tomorrow · 01:00–06:00 · 5h window
High confidence
97%
🌫️Fog Probability81-99.7%
Dewpoint Spread: 0.2°C
Visibility: 7733 (Moderate)
Relative Humidity: 98%
Wind Speed: 1.1m/s (calm conditions)
fog weather icon
Dense Fog at Sunrise
Banff
Tomorrow · 06:00–08:00
🌫️Fog Probability:86-98.5%
High
fog weather icon
Moderate Fog
Banff
Tomorrow · 08:00–09:00
🌫️Fog Probability:66.7%
Medium
fog weather icon
Moderate Fog
Banff
Mon, Apr 13 · 15:00–22:00
🌫️Fog Probability:62.7-79.7%
Low
fog weather icon
Moderate Fog
Banff
Thu, Apr 16 · 22:00–01:00
🌫️Fog Probability:61.4-79.7%
Low

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 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
America/Edmonton
Fog Probability
≥ 60.0%
Tue, Apr 7
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Apr 8
24:000%
01:000%
02:000%
03:000%
04:000%
05:0046%
06:0046%
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%
20:0015%
21:000%
22:000%
23:000%
Thu, Apr 9
24:000%
01:0099%
02:00100%
03:0096%
04:0086%
05:0081%
06:0086%
07:0099%
08:0067%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:0043%
22:0043%
23:0043%
Fri, Apr 10
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%
23:0043%
Sat, Apr 11
24:0043%
01:0043%
02:0043%
03:0043%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:0020%
14:0042%
15:0052%
16:000%
17:000%
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
Wed, Apr 8 Sunrise 06:59 Sunset 20:26
19:00 ☾
0% -6.2°C 0mm 64% 0.27cm 13° -0.15°C 0.19mm 0.22kPa 7390m 2m/s 1.3m/s
20:00 ☾
0% -5.3°C 0.01mm 87% 0.65cm 3.6° -3.5°C 0.63mm 0.06kPa 2037m 0.7m/s 0.28m/s
21:00 ☾
0% -6.2°C 0.03mm 94% 0.47cm -5.7° -5.3°C 1.3mm 0.03kPa 1162m 1.9m/s 1.9m/s
22:00 ☾
0% -6.3°C 0.01mm 95% 0cm -14° -5.6°C 1.4mm 0.02kPa 15095m 2.1m/s 2.1m/s
23:00 ☾
0% -6.9°C 0.1mm 97% 0.1cm -21° -6.4°C 1.4mm 0.01kPa 450m 1.4m/s 1.6m/s
Thu, Apr 9 Sunrise 06:59 Sunset 20:26
24:00 ☾
0% -5.9°C 0.05mm 97% 0.05cm -27° -5.5°C 1.5mm 0.01kPa 739m 1.2m/s 1.1m/s
01:00 ☾
14% -7.6°C 0mm 98% 0cm -30° -7.4°C 0mm 0.01kPa 11829m 0.7m/s 0.74m/s
02:00 ☾
27% -9.1°C 0mm 98% 0cm -31° -8.9°C 0mm 0.01kPa 7733m 0.9m/s 1.1m/s
03:00 ☾
41% -9.5°C 0mm 98% 0cm -29° -9.3°C 0mm 0.01kPa 7104m 1m/s 1.2m/s
04:00 ☾
42% -9.9°C 0mm 97% 0cm -24° -9.5°C 0mm 0.01kPa 6417m 0.9m/s 1.1m/s
05:00 ☾
44% -10°C 0.01mm 97% 0cm -18° -9.7°C 0.06mm 0.01kPa 5390m 1m/s 1.1m/s
06:00 ☾
45% -9.8°C 0.01mm 97% 0cm -9.6° -9.4°C 0.06mm 0.01kPa 3058m 0.8m/s 0.92m/s
07:00 ☾
44% -9.7°C 0.02mm 98% 0cm -0.36° -9.4°C 0mm 0.01kPa 1923m 0.63m/s 0.77m/s
08:00 ☾
43% -8.1°C 0.03mm 95% 0cm 8.6° -7.4°C 0.06mm 0.02kPa 1645m 0.31m/s 0.26m/s
09:00 ☾
42% -6.8°C 0.02mm 90% 0cm 18° -5.4°C 0.06mm 0.04kPa 3015m 1m/s 0.9m/s
10:00 ☾
33% -6.1°C 0.01mm 83% 0cm 27° -3.7°C 0.06mm 0.08kPa 9394m 1.2m/s 1.3m/s
11:00 ☾
25% -5.6°C 0.02mm 79% 0cm 35° -2.4°C 0.13mm 0.11kPa 15655m 1.4m/s 1.5m/s
12:00 ☾
16% -5.4°C 0.01mm 74% 0cm 42° -1.4°C 0.13mm 0.14kPa 18689m 1.5m/s 1.1m/s
13:00 ☾
11% -5.4°C 0mm 68% 0.03cm 46° -0.23°C 0.06mm 0.19kPa 11293m 1.8m/s 0.79m/s
14:00 ☾
6% -5.1°C 0mm 62% 0.02cm 47° 1.3°C 0.06mm 0.25kPa 15679m 1.9m/s 0.49m/s
15:00 ☾
1% -5.1°C 0mm 58% 0cm 44° 2.4°C 0.06mm 0.31kPa 23301m 2.5m/s 0.92m/s
16:00 ☾
1% -5.7°C 0mm 54% 0cm 38° 2.8°C 0.06mm 0.35kPa 24135m 2.8m/s 1.4m/s
17:00 ☾
0% -6°C 0mm 52% 0cm 31° 3°C 0.06mm 0.36kPa 24134m 2.9m/s 1.7m/s
18:00 ☾
0% -5.5°C 0mm 55% 0cm 22° 2.7°C 0.06mm 0.34kPa 24135m 2.8m/s 2m/s
19:00 ☾
0% -3.5°C 0mm 68% 0cm 13° 1.9°C 0mm 0.22kPa 24134m 2.4m/s 1.8m/s
20:00 ☾
0% -3.7°C 0mm 86% 0cm 3.8° -1.7°C 0mm 0.07kPa 24134m 1.5m/s 1.4m/s
21:00 ☾
0% -5.6°C 0mm 93% 0cm -5.4° -4.7°C 0mm 0.03kPa 24135m 0.71m/s 0.54m/s
22:00 ☾
16% -6.2°C 0mm 94% 0cm -14° -5.4°C 0mm 0.03kPa 24134m 0.7m/s 0.78m/s
23:00 ☾
32% -6.5°C 0mm 93% 0cm -21° -5.5°C 0mm 0.03kPa 24134m 1.2m/s 1.4m/s
Fri, Apr 10 Sunrise 06:57 Sunset 20:28
24:00 ☾
48% -6.7°C 0mm 92% 0cm -27° -5.6°C 0mm 0.03kPa 24135m 1.4m/s 1.7m/s
01:00 ☾
58% -6.7°C 0mm 92% 0cm -30° -5.6°C 0mm 0.03kPa 24134m 1.6m/s 1.9m/s
02:00 ☾
69% -6.9°C 0mm 92% 0cm -31° -5.9°C 0mm 0.03kPa 24134m 1.7m/s 2m/s
03:00 ☾
79% -7°C 0mm 92% 0cm -29° -5.9°C 0mm 0.03kPa 24135m 1.8m/s 2.2m/s
04:00 ☾
81% -7.2°C 0mm 92% 0cm -24° -6.1°C 0mm 0.03kPa 24135m 1.8m/s 2.2m/s
05:00 ☾
83% -7.3°C 0mm 91% 0cm -17° -6.2°C 0mm 0.03kPa 24134m 1.8m/s 2.3m/s
06:00 ☾
85% -7.6°C 0mm 91% 0cm -9.3° -6.3°C 0mm 0.03kPa 24134m 1.9m/s 2.3m/s
07:00 ☾
76% -7.7°C 0mm 91% 0cm 0.1° -6.4°C 0mm 0.03kPa 24134m 1.9m/s 2.4m/s
08:00 ☾
67% -6.6°C 0mm 86% 0cm 9° -4.7°C 0mm 0.06kPa 24134m 2.3m/s 2.2m/s
09:00 ☾
58% -5.5°C 0mm 75% 0cm 18° -1.6°C 0mm 0.14kPa 24134m 2.5m/s 2.2m/s
10:00 ☾
56% -4.8°C 0mm 67% 0cm 27° 0.71°C 0mm 0.21kPa 24134m 2.6m/s 2.3m/s
11:00 ☾
54% -4.8°C 0mm 59% 0cm 35° 2.4°C 0mm 0.3kPa 24135m 2.5m/s 2.1m/s
12:00 ☾
52% -4.6°C 0mm 54% 0cm 42° 3.9°C 0mm 0.37kPa 24135m 2.5m/s 2.1m/s
13:00 ☾
52% -4.5°C 0mm 50% 0cm 46° 5.1°C 0mm 0.44kPa 24135m 2.4m/s 2m/s
14:00 ☾
51% -4.4°C 0mm 47% 0cm 47° 6.1°C 0mm 0.5kPa 24134m 2.3m/s 1.9m/s
15:00 ☾
51% -4.2°C 0mm 44% 0cm 44° 7.1°C 0mm 0.56kPa 24135m 2.1m/s 1.7m/s
16:00 ☾
55% -4.3°C 0mm 43% 0cm 39° 7.5°C 0mm 0.59kPa 24134m 1.9m/s 1.6m/s
17:00 ☾
58% -4.3°C 0mm 43% 0cm 31° 7.4°C 0mm 0.58kPa 24135m 1.8m/s 1.5m/s
18:00 ☾
62% -3.9°C 0mm 46% 0cm 23° 7.1°C 0mm 0.55kPa 24134m 1.6m/s 1.3m/s
19:00 ☾
51% -0.2°C 0mm 66% 0cm 13° 5.5°C 0mm 0.3kPa 24134m 0.8m/s 0.84m/s
20:00 ☾
40% -1.5°C 0mm 82% 0cm 4° 1.3°C 0mm 0.12kPa 24134m 0.5m/s 0.27m/s
21:00 ☾
29% -3°C 0mm 87% 0cm -5.2° -1.1°C 0mm 0.07kPa 24135m 0.9m/s 0.9m/s
22:00 ☾
22% -3.1°C 0mm 91% 0cm -14° -1.8°C 0mm 0.05kPa 20160m 0.9m/s 0.99m/s
23:00 ☾
14% -2.8°C 0mm 93% 0cm -21° -1.8°C 0mm 0.04kPa 16402m 1m/s 1.2m/s
Sat, Apr 11 Sunrise 06:55 Sunset 20:30
24:00 ☾
7% -2.5°C 0mm 95% 0cm -26° -1.7°C 0mm 0.03kPa 15811m 0.9m/s 0.91m/s
01:00 ☾
5% -1.9°C 0mm 94% 0cm -30° -1°C 0.04mm 0.03kPa 15640m 1.1m/s 1.1m/s
02:00 ☾
2% -1.3°C 0mm 93% 0cm -30° -0.38°C 0.08mm 0.04kPa 15469m 1.4m/s 1.4m/s
03:00 ☾
0% -0.7°C 0mm 93% 0cm -28° 0.28°C 0.13mm 0.04kPa 15297m 1.6m/s 1.6m/s
04:00 ☾
0% -0.8°C 0mm 85% 0cm -24° 1.4°C 0.13mm 0.1kPa 18243m 1.7m/s 1.6m/s
05:00 ☾
0% -1°C 0mm 77% 0cm -17° 2.6°C 0.13mm 0.17kPa 21189m 1.7m/s 1.6m/s
06:00 ☾
0% -1.4°C 0mm 69% 0cm -8.9° 3.7°C 0.13mm 0.24kPa 24135m 1.7m/s 1.6m/s
07:00 ☾
0% -0.8°C 0mm 71% 0.02cm 0.38° 4°C 0.1mm 0.24kPa 18011m 1.4m/s 1.5m/s
08:00 ☾
0% -0.3°C 0mm 72% 0.04cm 9.3° 4.2°C 0.08mm 0.23kPa 11886m 1.1m/s 1.5m/s
09:00 ☾
0% 0.2°C 0mm 74% 0.07cm 19° 4.5°C 0.06mm 0.22kPa 5762m 0.84m/s 1.4m/s
10:00 ☾
0% 0.5°C 0.03mm 80% 0.11cm 28° 3.6°C 0.19mm 0.16kPa 6615m 1.2m/s 1.6m/s
11:00 ☾
0% 0.7°C 0.07mm 86% 0.16cm 36° 2.8°C 0.31mm 0.1kPa 7468m 1.5m/s 1.7m/s
12:00 ☾
0% 0.8°C 0.1mm 92% 0.21cm 42° 1.9°C 0.44mm 0.05kPa 8320m 1.8m/s 1.9m/s
13:00 ☾
0% 0.4°C 0.21mm 95% 0.28cm 46° 1.1°C 0.56mm 0.04kPa 5557m 1.8m/s 1.9m/s
14:00 ☾
1% 0°C 0.32mm 97% 0.36cm 47° 0.38°C 0.69mm 0.02kPa 2794m 1.8m/s 1.8m/s
15:00 ☾
1% -0.5°C 0.43mm 99% 0.43cm 45° -0.38°C 0.81mm 0kPa 31m 1.7m/s 1.7m/s
16:00 ☾
1% -0.8°C 0.38mm 99% 0.39cm 39° -0.69°C 1.3mm 0kPa 37m 1.7m/s 1.7m/s
17:00 ☾
0% -1.1°C 0.34mm 99% 0.34cm 31° -0.99°C 1.7mm 0.01kPa 43m 1.8m/s 1.8m/s
18:00 ☾
0% -1.4°C 0.29mm 99% 0.29cm 23° -1.3°C 2.2mm 0.01kPa 49m 1.8m/s 1.8m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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