Rule
Fog Hunter
Valemount - Fog Hunter - Canadian Rockies
Valemount, British Columbia, Canada
Thick, moody fog for atmospheric forest and landscape shots
Currently
Real-time conditionsDewpoint Spread1.0°C
Visibility8941 (Moderate)
Relative Humidity93%
Wind Speed2.4m/s (calm conditions)
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in America/Vancouver
Next opportunity
Dense Fog (lingering)
Valemount
Today · 23:00–01:00 · 2h window
Medium confidence
50%
🌫️Fog Probability91.7-100%
Dewpoint Spread: 0.5°C
Visibility: 1668 (Mist/Haze)
Relative Humidity: 96%
Wind Speed: 1.8m/s (calm conditions)
Dense Fog (lingering)
Valemount
Tomorrow · 23:00–24:00
🌫️Fog Probability:100%
High
Dense Fog (lingering)
Valemount
Mon, Mar 2 · 20:00–02:00
🌫️Fog Probability:87.5-98.6%
Low
What this forecast looks for
Plain-language explanation from the ruleThis 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 hourAND logic: all conditions required
Meets requirement
Misses requirement
Time America/Vancouver | Fog Probability ≥ 85.0% | Dewpoint Spread ≤ 2.0°C | Visibility ≤ 3000.0m | Wind Speed ≤ 2.0m/s |
|---|---|---|---|---|
| Sat, Feb 21 | ||||
| 17:00 | 0% | 2.7°C | 23215m | 1m/s |
| 18:00 | 0% | 1.9°C | 12968m | 1.3m/s |
| 19:00 | 0% | 2.4°C | 6009m | 1.6m/s |
| 20:00 | 100% | 1.9°C | 912m | 1.4m/s |
| 21:00 | 100% | 1.3°C | 452m | 1.4m/s |
| 22:00 | 53% | 1.3°C | 390m | 1.3m/s |
| 23:00 | 0% | 1.3°C | 5953m | 1.2m/s |
| Sun, Feb 22 | ||||
| 24:00 | 0% | 1.3°C | 10075m | 1m/s |
| 01:00 | 79% | 1.7°C | 2060m | 1.2m/s |
| 02:00 | 90% | 1.7°C | 1426m | 0.95m/s |
| 03:00 | 94% | 1.2°C | 1514m | 0.85m/s |
| 04:00 | 0% | 1.4°C | 3140m | 0.87m/s |
| 05:00 | 88% | 1°C | 3491m | 0.79m/s |
| 06:00 | 88% | 0.8°C | 4486m | 0.54m/s |
| 07:00 | 76% | 1°C | 6693m | 0.41m/s |
| 08:00 | 0% | 2°C | 15165m | 0.8m/s |
| 09:00 | 0% | 2.6°C | 22052m | 0.86m/s |
| 10:00 | 0% | 3.4°C | 24135m | 1.2m/s |
| 11:00 | 0% | 4°C | 24135m | 1.2m/s |
| 12:00 | 0% | 4.5°C | 24135m | 1.6m/s |
| 13:00 | 0% | 5°C | 24134m | 1.8m/s |
| 14:00 | 0% | 4.5°C | 16627m | 2.4m/s |
| 15:00 | 0% | 2.9°C | 22757m | 2.4m/s |
| 16:00 | 0% | 2°C | 22615m | 2.2m/s |
| 17:00 | 76% | 1°C | 8941m | 2.4m/s |
| 18:00 | 38% | 0.4°C | 11792m | 1.5m/s |
| 19:00 | 53% | 0.5°C | 1704m | 1.6m/s |
| 20:00 | 57% | 0.6°C | 209m | 2m/s |
| 21:00 | 0% | 0.6°C | 286m | 2.3m/s |
| 22:00 | 0% | 0.5°C | 929m | 1.9m/s |
| 23:00 | 100% | 0.5°C | 1668m | 1.8m/s |
| Mon, Feb 23 | ||||
| 24:00 | 92% | 0.5°C | 2717m | 1.5m/s |
| 01:00 | 40% | 0.6°C | 5049m | 1.5m/s |
| 02:00 | 58% | 0.4°C | 346m | 1.1m/s |
| 03:00 | 58% | 0.5°C | 213m | 1.6m/s |
| 04:00 | 0% | 0.4°C | 134m | 1.1m/s |
| 05:00 | 58% | 0.5°C | 338m | 1.4m/s |
| 06:00 | 47% | 0.4°C | 2430m | 1.2m/s |
| 07:00 | 47% | 0.5°C | 4342m | 0.82m/s |
| 08:00 | 57% | 0.7°C | 325m | 1.2m/s |
| 09:00 | 46% | 1.1°C | 291m | 1.3m/s |
| 10:00 | 46% | 1.4°C | 433m | 1.6m/s |
| 11:00 | 0% | 2.3°C | 17819m | 1.4m/s |
| 12:00 | 0% | 2.6°C | 12454m | 0.95m/s |
| 13:00 | 0% | 2.3°C | 16754m | 0.84m/s |
| 14:00 | 46% | 1.2°C | 399m | 0.41m/s |
| 15:00 | 48% | 0.9°C | 289m | 0.27m/s |
| 16:00 | 0% | 0.7°C | 204m | 0.33m/s |
| 17:00 | 60% | 0.2°C | 119m | 0.51m/s |
| 18:00 | 60% | 0.3°C | 132m | 0.97m/s |
| 19:00 | 0% | 0.3°C | 170m | 1.4m/s |
| 20:00 | 0% | 0.5°C | 243m | 1.5m/s |
| 21:00 | 0% | 0.6°C | 327m | 1.5m/s |
| 22:00 | 0% | 0.6°C | 318m | 1.5m/s |
| 23:00 | 100% | 0.7°C | 355m | 1.4m/s |
| Tue, Feb 24 | ||||
| 24:00 | 55% | 0.7°C | 763m | 1.4m/s |
| 01:00 | 44% | 0.7°C | 4377m | 1.4m/s |
| 02:00 | 34% | 0.9°C | 14176m | 1.4m/s |
| 03:00 | 34% | 0.8°C | 13439m | 1.4m/s |
| 04:00 | 36% | 0.6°C | 13441m | 1.2m/s |
| 05:00 | 72% | 0.6°C | 13399m | 1.3m/s |
| 06:00 | 72% | 0.5°C | 13781m | 1.2m/s |
| 07:00 | 75% | 0.5°C | 13583m | 1.1m/s |
| 08:00 | 0% | 1.2°C | 13793m | 1.2m/s |
| 09:00 | 0% | 2.1°C | 15498m | 1.5m/s |
| 10:00 | 0% | 2.7°C | 18404m | 1.8m/s |
| 11:00 | 0% | 3.6°C | 21064m | 1.8m/s |
| 12:00 | 0% | 4.4°C | 24135m | 2m/s |
| 13:00 | 0% | 5.3°C | 24134m | 2.3m/s |
| 14:00 | 0% | 6.2°C | 24134m | 2.3m/s |
| 15:00 | 0% | 6.4°C | 24135m | 2.4m/s |
| 16:00 | 0% | 4.5°C | 24134m | 2.2m/s |
| 17:00 | 0% | 1.7°C | 24135m | 1.9m/s |
| 18:00 | 0% | 1.2°C | 24135m | 1.9m/s |
| 19:00 | 60% | 1°C | 24134m | 1.8m/s |
| 20:00 | 0% | 1°C | 18415m | 1.9m/s |
| 21:00 | 0% | 1.1°C | 18642m | 2.2m/s |
| 22:00 | 60% | 0.9°C | 17250m | 2m/s |
| 23:00 | 68% | 0.9°C | 12495m | 1.6m/s |
| Wed, Feb 25 | ||||
| 24:00 | 38% | 0.9°C | 7740m | 1.3m/s |
| 01:00 | 44% | 0.8°C | 2985m | 0.9m/s |
| 02:00 | 42% | 1.4°C | 2855m | 1.2m/s |
| 03:00 | 40% | 1.8°C | 2725m | 1.4m/s |
| 04:00 | 0% | 2.4°C | 2594m | 1.7m/s |
| 05:00 | 0% | 3°C | 7857m | 2m/s |
| 06:00 | 0% | 3.5°C | 13119m | 2.3m/s |
| 07:00 | 0% | 4.2°C | 18381m | 2.6m/s |
| 08:00 | 0% | 3.4°C | 18206m | 2.6m/s |
| 09:00 | 0% | 2.8°C | 18030m | 2.6m/s |
| 10:00 | 0% | 2.2°C | 17855m | 2.6m/s |
| 11:00 | 0% | 1.8°C | 12167m | 2.7m/s |
| 12:00 | 0% | 1.5°C | 6478m | 2.7m/s |
| 13:00 | 0% | 1.1°C | 789m | 2.7m/s |
| 14:00 | 0% | 1.2°C | 1772m | 2.5m/s |
| 15:00 | 0% | 1.2°C | 2754m | 2.3m/s |
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 scoreThis 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/Vancouver | Dew Point °C | Rainfall mm | Relative Humidity % | Snowfall cm | Temperature °C | Total Precipitation mm | Vapor Pressure Deficit kPa | Wind Gusts m/s |
|---|---|---|---|---|---|---|---|---|
| Sun, Feb 22
Sunrise 06:56
Sunset 17:22 | ||||||||
| 17:00 ☾ | -5.5°C | 0.14mm | 93% | 0cm | -4.5°C | 0mm | 0.03kPa | 4.5m/s |
| 18:00 ☾ | -5.3°C | 0.01mm | 97% | 0cm | -4.9°C | 0.31mm | 0.01kPa | 2.9m/s |
| 19:00 ☾ | -7.7°C | 0.1mm | 97% | 0.1cm | -7.2°C | 0.38mm | 0.01kPa | 1.9m/s |
| 20:00 ☾ | -6.5°C | 0.72mm | 96% | 0.73cm | -5.9°C | 0.63mm | 0.02kPa | 3.9m/s |
| 21:00 ☾ | -5.6°C | 0.66mm | 96% | 0.87cm | -5°C | 1.9mm | 0.02kPa | 4.2m/s |
| 22:00 ☾ | -5.7°C | 0.16mm | 96% | 0.2cm | -5.2°C | 2.3mm | 0.02kPa | 3.2m/s |
| 23:00 ☾ | -6.9°C | 0.08mm | 96% | 0cm | -6.4°C | 0.13mm | 0.02kPa | 2.7m/s |
| Mon, Feb 23
Sunrise 06:56
Sunset 17:22 | ||||||||
| 24:00 ☾ | -7.6°C | 0.07mm | 96% | 0cm | -7.1°C | 0.19mm | 0.01kPa | 1.8m/s |
| 01:00 ☾ | -8.3°C | 0.02mm | 96% | 0cm | -7.7°C | 0.25mm | 0.01kPa | 1.7m/s |
| 02:00 ☾ | -7.3°C | 0.12mm | 97% | 0.19cm | -6.9°C | 0.38mm | 0.01kPa | 1.6m/s |
| 03:00 ☾ | -6.2°C | 0.23mm | 96% | 0.29cm | -5.7°C | 0.69mm | 0.01kPa | 3.2m/s |
| 04:00 ☾ | -6.1°C | 0.34mm | 97% | 0.35cm | -5.7°C | 1mm | 0.01kPa | 2.2m/s |
| 05:00 ☾ | -5.6°C | 0.22mm | 97% | 0.33cm | -5.1°C | 0.31mm | 0.01kPa | 2.6m/s |
| 06:00 ☾ | -6.9°C | 0.05mm | 97% | 0cm | -6.5°C | 0.44mm | 0.01kPa | 1.2m/s |
| 07:00 ☾ | -7.9°C | 0.04mm | 96% | 0cm | -7.4°C | 0.5mm | 0.01kPa | 1m/s |
| 08:00 ☾ | -7.6°C | 0.18mm | 95% | 0.18cm | -6.9°C | 0.56mm | 0.02kPa | 1.9m/s |
| 09:00 ☾ | -5.5°C | 0.16mm | 92% | 0.16cm | -4.4°C | 0.75mm | 0.04kPa | 2.1m/s |
| 10:00 ☾ | -4.3°C | 0.13mm | 90% | 0.13cm | -2.9°C | 0.88mm | 0.05kPa | 2.3m/s |
| 11:00 ☾ | -3.8°C | 0.04mm | 84% | 0cm | -1.5°C | 0.06mm | 0.09kPa | 2.2m/s |
| 12:00 ☾ | -3.3°C | 0.1mm | 83% | 0cm | -0.72°C | 0.13mm | 0.1kPa | 1.3m/s |
| 13:00 ☾ | -2.9°C | 0.04mm | 84% | 0.06cm | -0.56°C | 0.19mm | 0.09kPa | 1.5m/s |
| 14:00 ☾ | -2.2°C | 0.23mm | 92% | 0.28cm | -1°C | 0.31mm | 0.05kPa | 1m/s |
| 15:00 ☾ | -1.9°C | 0.27mm | 94% | 0.32cm | -0.96°C | 0.63mm | 0.04kPa | 0.9m/s |
| 16:00 ☾ | -1.9°C | 0.33mm | 96% | 0.41cm | -1.2°C | 1mm | 0.02kPa | 1m/s |
| 17:00 ☾ | -2.3°C | 0.44mm | 98% | 0.48cm | -2.1°C | 0.44mm | 0.01kPa | 1.1m/s |
| 18:00 ☾ | -3.3°C | 0.32mm | 98% | 0.38cm | -3°C | 0.94mm | 0.01kPa | 1.5m/s |
| 19:00 ☾ | -4.1°C | 0.27mm | 97% | 0.36cm | -3.8°C | 1.4mm | 0.01kPa | 1.9m/s |
| 20:00 ☾ | -5.3°C | 0.16mm | 96% | 0.16cm | -4.8°C | 1.7mm | 0.02kPa | 1.7m/s |
| 21:00 ☾ | -6.2°C | 0.12mm | 96% | 0.12cm | -5.6°C | 1.9mm | 0.02kPa | 1.7m/s |
| 22:00 ☾ | -7.1°C | 0.16mm | 96% | 0.16cm | -6.5°C | 2.1mm | 0.02kPa | 1.8m/s |
| 23:00 ☾ | -7.5°C | 0.13mm | 95% | 0.13cm | -6.8°C | 0.19mm | 0.02kPa | 1.7m/s |
| Tue, Feb 24
Sunrise 06:54
Sunset 17:24 | ||||||||
| 24:00 ☾ | -8.2°C | 0.09mm | 95% | 0.09cm | -7.5°C | 0.25mm | 0.02kPa | 1.4m/s |
| 01:00 ☾ | -9.3°C | 0.07mm | 95% | 0cm | -8.6°C | 0.31mm | 0.02kPa | 1.2m/s |
| 02:00 ☾ | -10°C | 0.05mm | 94% | 0cm | -9.5°C | 0.38mm | 0.02kPa | 1.2m/s |
| 03:00 ☾ | -11°C | 0.03mm | 94% | 0cm | -11°C | 0.44mm | 0.02kPa | 1.1m/s |
| 04:00 ☾ | -12°C | 0.02mm | 95% | 0cm | -12°C | 0.44mm | 0.01kPa | 1.1m/s |
| 05:00 ☾ | -13°C | 0.02mm | 95% | 0cm | -13°C | 0mm | 0.01kPa | 1.2m/s |
| 06:00 ☾ | -14°C | 0.01mm | 96% | 0cm | -13°C | 0mm | 0.01kPa | 1.2m/s |
| 07:00 ☾ | -14°C | 0.01mm | 96% | 0cm | -14°C | 0mm | 0.01kPa | 1.1m/s |
| 08:00 ☾ | -12°C | 0.01mm | 91% | 0cm | -11°C | 0.06mm | 0.02kPa | 1.6m/s |
| 09:00 ☾ | -10°C | 0.01mm | 85% | 0cm | -8.4°C | 0.06mm | 0.05kPa | 2.3m/s |
| 10:00 ☾ | -9°C | 0.01mm | 81% | 0cm | -6.3°C | 0.06mm | 0.07kPa | 2.5m/s |
| 11:00 ☾ | -7.9°C | 0mm | 76% | 0cm | -4.3°C | 0mm | 0.1kPa | 2.5m/s |
| 12:00 ☾ | -7.3°C | 0mm | 72% | 0cm | -2.9°C | 0mm | 0.14kPa | 2.7m/s |
| 13:00 ☾ | -7.4°C | 0mm | 67% | 0cm | -2.1°C | 0mm | 0.17kPa | 3m/s |
| 14:00 ☾ | -7.7°C | 0mm | 63% | 0cm | -1.5°C | 0mm | 0.2kPa | 3m/s |
| 15:00 ☾ | -8°C | 0mm | 62% | 0cm | -1.6°C | 0mm | 0.21kPa | 3m/s |
| 16:00 ☾ | -6.8°C | 0mm | 71% | 0cm | -2.3°C | 0mm | 0.15kPa | 3.1m/s |
| 17:00 ☾ | -7.5°C | 0mm | 87% | 0cm | -5.8°C | 0mm | 0.05kPa | 1.6m/s |
| 18:00 ☾ | -10°C | 0mm | 91% | 0cm | -8.9°C | 0mm | 0.03kPa | 1.6m/s |
| 19:00 ☾ | -11°C | 0mm | 92% | 0cm | -9.9°C | 0mm | 0.02kPa | 1.6m/s |
| 20:00 ☾ | -10°C | 0mm | 92% | 0cm | -9.5°C | 0mm | 0.02kPa | 2.3m/s |
| 21:00 ☾ | -9.7°C | 0mm | 92% | 0cm | -8.6°C | 0mm | 0.03kPa | 3.2m/s |
| 22:00 ☾ | -9.6°C | 0mm | 93% | 0cm | -8.7°C | 0mm | 0.02kPa | 2.7m/s |
| 23:00 ☾ | -9.9°C | 0.04mm | 93% | 0cm | -9°C | 0.13mm | 0.02kPa | 2.4m/s |
| Wed, Feb 25
Sunrise 06:52
Sunset 17:26 | ||||||||
| 24:00 ☾ | -10°C | 0.08mm | 93% | 0cm | -9.2°C | 0.25mm | 0.02kPa | 2.1m/s |
| 01:00 ☾ | -10°C | 0.12mm | 94% | 0cm | -9.5°C | 0.38mm | 0.02kPa | 1.8m/s |
| 02:00 ☾ | -9.4°C | 0.18mm | 90% | 0.1cm | -8°C | 0.6mm | 0.03kPa | 2.3m/s |
| 03:00 ☾ | -8.4°C | 0.23mm | 86% | 0.19cm | -6.6°C | 0.83mm | 0.05kPa | 2.8m/s |
| 04:00 ☾ | -7.5°C | 0.29mm | 83% | 0.29cm | -5.1°C | 1.1mm | 0.07kPa | 3.2m/s |
| 05:00 ☾ | -7.3°C | 0.27mm | 80% | 0.19cm | -4.3°C | 0.98mm | 0.09kPa | 3.5m/s |
| 06:00 ☾ | -7°C | 0.24mm | 76% | 0.1cm | -3.5°C | 0.9mm | 0.11kPa | 3.8m/s |
| 07:00 ☾ | -6.8°C | 0.22mm | 73% | 0cm | -2.6°C | 0.81mm | 0.13kPa | 4.1m/s |
| 08:00 ☾ | -6.4°C | 0.26mm | 77% | 0cm | -3°C | 1.1mm | 0.11kPa | 4.2m/s |
| 09:00 ☾ | -6.1°C | 0.31mm | 81% | 0cm | -3.3°C | 1.4mm | 0.09kPa | 4.3m/s |
| 10:00 ☾ | -5.8°C | 0.35mm | 85% | 0cm | -3.6°C | 1.7mm | 0.07kPa | 4.4m/s |
| 11:00 ☾ | -6°C | 0.45mm | 87% | 0.21cm | -4.2°C | 1.7mm | 0.06kPa | 4.5m/s |
| 12:00 ☾ | -6.2°C | 0.54mm | 89% | 0.43cm | -4.7°C | 1.7mm | 0.05kPa | 4.6m/s |
| 13:00 ☾ | -6.4°C | 0.64mm | 92% | 0.64cm | -5.3°C | 1.7mm | 0.04kPa | 4.7m/s |
| 14:00 ☾ | -6.6°C | 0.56mm | 91% | 0.56cm | -5.4°C | 2.2mm | 0.03kPa | 4.3m/s |
| 15:00 ☾ | -6.8°C | 0.48mm | 91% | 0.48cm | -5.6°C | 2.8mm | 0.03kPa | 3.9m/s |
| 16:00 ☾ | -6.9°C | 0.4mm | 91% | 0.4cm | -5.7°C | 3.3mm | 0.03kPa | 3.5m/s |
How to read: these inputs help produce the derived score; they are not requirements by themselves.
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