Rule
Fog Hunter
Castle Junction - Fog Hunter - Canadian Rockies
Castle Junction, Alberta, Canada
Thick, moody fog for atmospheric forest and landscape shots
Currently
Real-time conditionsDewpoint Spread0.5°C
Visibility20295 (Clear)
Relative Humidity96%
Wind Speed2.1m/s (calm conditions)
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in America/Edmonton
Next opportunity
Dense Fog (lingering)
Castle Junction
Tue, Feb 24 · 02:00–04:00 · 2h window
Low confidence
38%
🌫️Fog Probability91.7-94.4%
Dewpoint Spread: 0.3°C
Visibility: 2774 (Mist/Haze)
Relative Humidity: 98%
Wind Speed: 1.8m/s (calm conditions)
Dense Fog (lingering)
Castle Junction
Wed, Feb 25 · 24:00–04:00
🌫️Fog Probability:100%
Medium
Dense Fog (lingering)
Castle Junction
Sun, Mar 1 · 02:00–03:00
🌫️Fog Probability:97.2%
Medium
Dense Fog (lingering)
Castle Junction
Mon, Mar 2 · 01:00–03:00
🌫️Fog Probability:97.2%
Medium
Dense Fog (lingering)
Castle Junction
Mon, Mar 2 · 14:00–22:00
🌫️Fog Probability:86.7-100%
Medium
Dense Fog (lingering)
Castle Junction
Tue, Mar 3 · 02:00–03:00
🌫️Fog Probability:97.2%
Medium
Dense Fog (lingering)
Castle Junction
Tue, Mar 3 · 14:00–19:00
🌫️Fog Probability:95.6-100%
Medium
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/Edmonton | Fog Probability ≥ 85.0% | Dewpoint Spread ≤ 2.0°C | Visibility ≤ 3000.0m | Wind Speed ≤ 2.0m/s |
|---|---|---|---|---|
| Sat, Feb 21 | ||||
| 18:00 | 68% | 0.7°C | 11164m | 1.4m/s |
| 19:00 | 86% | 0.2°C | 9242m | 1.4m/s |
| 20:00 | 86% | 0.1°C | 5413m | 1.3m/s |
| 21:00 | 86% | 0°C | 5737m | 1.2m/s |
| 22:00 | 97% | 0°C | 4602m | 1.1m/s |
| 23:00 | 86% | 0°C | 5233m | 1.2m/s |
| Sun, Feb 22 | ||||
| 24:00 | 97% | 0°C | 4960m | 0.86m/s |
| 01:00 | 86% | 0°C | 5037m | 0.82m/s |
| 02:00 | 86% | 0°C | 5840m | 0.89m/s |
| 03:00 | 86% | 0°C | 6669m | 1.1m/s |
| 04:00 | 86% | 0°C | 6722m | 1m/s |
| 05:00 | 86% | 0°C | 6620m | 1.1m/s |
| 06:00 | 78% | 0°C | 11847m | 0.91m/s |
| 07:00 | 69% | 0°C | 15228m | 0.93m/s |
| 08:00 | 69% | 0°C | 15232m | 0.65m/s |
| 09:00 | 60% | 0.9°C | 24135m | 0.54m/s |
| 10:00 | 0% | 2°C | 24135m | 1.2m/s |
| 11:00 | 0% | 2.9°C | 24135m | 1.9m/s |
| 12:00 | 0% | 3°C | 24135m | 2.4m/s |
| 13:00 | 0% | 2.9°C | 24135m | 2.3m/s |
| 14:00 | 0% | 2.9°C | 24134m | 2.8m/s |
| 15:00 | 0% | 3°C | 24134m | 2.4m/s |
| 16:00 | 0% | 2.6°C | 24135m | 2.8m/s |
| 17:00 | 0% | 1.4°C | 23992m | 2.4m/s |
| 18:00 | 67% | 0.5°C | 20295m | 2.1m/s |
| 19:00 | 86% | 0.1°C | 5131m | 2.4m/s |
| 20:00 | 97% | 0°C | 3888m | 1.4m/s |
| 21:00 | 60% | 0.2°C | 155m | 1.6m/s |
| 22:00 | 57% | 0.5°C | 144m | 1.5m/s |
| 23:00 | 58% | 0.4°C | 410m | 1.2m/s |
| Mon, Feb 23 | ||||
| 24:00 | 58% | 0.4°C | 219m | 1.7m/s |
| 01:00 | 58% | 0.3°C | 115m | 1.5m/s |
| 02:00 | 57% | 0.5°C | 179m | 1.5m/s |
| 03:00 | 58% | 0.4°C | 151m | 1.2m/s |
| 04:00 | 0% | 0.5°C | 122m | 1.3m/s |
| 05:00 | 0% | 0.5°C | 289m | 1.4m/s |
| 06:00 | 58% | 0.3°C | 114m | 1.1m/s |
| 07:00 | 57% | 0.5°C | 123m | 1.8m/s |
| 08:00 | 0% | 0.5°C | 114m | 1.4m/s |
| 09:00 | 0% | 0.6°C | 127m | 1.6m/s |
| 10:00 | 0% | 0.9°C | 188m | 1.4m/s |
| 11:00 | 0% | 1.1°C | 203m | 1.7m/s |
| 12:00 | 44% | 0.9°C | 189m | 2.5m/s |
| 13:00 | 42% | 1.3°C | 352m | 2.6m/s |
| 14:00 | 0% | 1.4°C | 1085m | 2.6m/s |
| 15:00 | 0% | 1.9°C | 4281m | 2.5m/s |
| 16:00 | 0% | 0.8°C | 271m | 2.5m/s |
| 17:00 | 0% | 0.6°C | 195m | 2m/s |
| 18:00 | 58% | 0.3°C | 226m | 1.3m/s |
| 19:00 | 0% | 0.4°C | 137m | 0.92m/s |
| 20:00 | 0% | 0.3°C | 103m | 1.2m/s |
| 21:00 | 0% | 0.4°C | 124m | 2.8m/s |
| 22:00 | 0% | 0.2°C | 19969m | 1.8m/s |
| 23:00 | 0% | 0.3°C | 7347m | 2m/s |
| Tue, Feb 24 | ||||
| 24:00 | 97% | 0°C | 3715m | 2.5m/s |
| 01:00 | 100% | 0°C | 640m | 2.2m/s |
| 02:00 | 94% | 0.3°C | 2774m | 1.8m/s |
| 03:00 | 92% | 0.6°C | 2740m | 1.9m/s |
| 04:00 | 88% | 0.9°C | 3164m | 1.8m/s |
| 05:00 | 0% | 1°C | 3936m | 2m/s |
| 06:00 | 0% | 1.2°C | 4439m | 1.9m/s |
| 07:00 | 0% | 1.2°C | 3411m | 1.8m/s |
| 08:00 | 79% | 1.4°C | 2968m | 1.7m/s |
| 09:00 | 79% | 1.5°C | 2781m | 1.5m/s |
| 10:00 | 70% | 2°C | 2319m | 1.9m/s |
| 11:00 | 0% | 2.5°C | 5637m | 1.8m/s |
| 12:00 | 0% | 2.8°C | 12881m | 2m/s |
| 13:00 | 0% | 3.3°C | 15885m | 2.2m/s |
| 14:00 | 0% | 3.8°C | 15146m | 2.4m/s |
| 15:00 | 0% | 4.1°C | 16737m | 2.5m/s |
| 16:00 | 0% | 4°C | 24135m | 2.5m/s |
| 17:00 | 0% | 2.5°C | 24105m | 2.2m/s |
| 18:00 | 60% | 0.9°C | 23727m | 2.2m/s |
| 19:00 | 86% | 0.2°C | 9479m | 2.5m/s |
| 20:00 | 97% | 0°C | 3128m | 2.5m/s |
| 21:00 | 100% | 0°C | 1711m | 2.4m/s |
| 22:00 | 100% | 0.1°C | 934m | 2.1m/s |
| 23:00 | 100% | 0.5°C | 927m | 2.1m/s |
| Wed, Feb 25 | ||||
| 24:00 | 100% | 0.3°C | 1270m | 1.8m/s |
| 01:00 | 100% | 0.2°C | 1613m | 1.5m/s |
| 02:00 | 100% | 0°C | 1955m | 1.2m/s |
| 03:00 | 100% | 0.3°C | 1522m | 1.8m/s |
| 04:00 | 100% | 0.5°C | 1088m | 2.5m/s |
| 05:00 | 100% | 0.8°C | 655m | 3.2m/s |
| 06:00 | 0% | 1.4°C | 3552m | 3.5m/s |
| 07:00 | 0% | 2.1°C | 6450m | 3.8m/s |
| 08:00 | 0% | 2.8°C | 9347m | 4.1m/s |
| 09:00 | 0% | 2.1°C | 6782m | 4m/s |
| 10:00 | 0% | 1.6°C | 4217m | 3.8m/s |
| 11:00 | 71% | 1.1°C | 1652m | 3.7m/s |
| 12:00 | 79% | 0.7°C | 1360m | 3.6m/s |
| 13:00 | 84% | 0.4°C | 1068m | 3.5m/s |
| 14:00 | 96% | 0°C | 776m | 3.4m/s |
| 15:00 | 100% | 0.1°C | 736m | 3.3m/s |
| 16:00 | 100% | 0°C | 696m | 3.3m/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/Edmonton | 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 07:40
Sunset 18:12 | ||||||||
| 18:00 ☾ | -8.6°C | 0mm | 96% | 0cm | -8.1°C | 0mm | 0.01kPa | 1.8m/s |
| 19:00 ☾ | -12°C | 0.01mm | 99% | 0cm | -12°C | 0mm | 0kPa | 2m/s |
| 20:00 ☾ | -13°C | 0.02mm | 100% | 0cm | -13°C | 0mm | 0kPa | 1.3m/s |
| 21:00 ☾ | -11°C | 0.25mm | 98% | 0.25cm | -11°C | 0.19mm | 0kPa | 1.5m/s |
| 22:00 ☾ | -8°C | 0.41mm | 96% | 0.41cm | -7.5°C | 0.56mm | 0.01kPa | 2m/s |
| 23:00 ☾ | -7.8°C | 0.1mm | 97% | 0.1cm | -7.4°C | 0.81mm | 0.01kPa | 1.5m/s |
| Mon, Feb 23
Sunrise 07:40
Sunset 18:12 | ||||||||
| 24:00 ☾ | -8.9°C | 0.28mm | 97% | 0.28cm | -8.5°C | 0.31mm | 0.01kPa | 1.6m/s |
| 01:00 ☾ | -11°C | 0.33mm | 97% | 0.33cm | -11°C | 0.5mm | 0.01kPa | 1.4m/s |
| 02:00 ☾ | -8.6°C | 0.19mm | 96% | 0.19cm | -8.1°C | 0.69mm | 0.01kPa | 2m/s |
| 03:00 ☾ | -9.3°C | 0.22mm | 97% | 0.22cm | -8.9°C | 0.88mm | 0.01kPa | 1.1m/s |
| 04:00 ☾ | -8.8°C | 0.3mm | 97% | 0.3cm | -8.3°C | 1.2mm | 0.01kPa | 1.5m/s |
| 05:00 ☾ | -8.4°C | 0.15mm | 96% | 0.15cm | -7.9°C | 1.4mm | 0.01kPa | 1.7m/s |
| 06:00 ☾ | -10°C | 0.43mm | 97% | 0.43cm | -10°C | 0.25mm | 0.01kPa | 1.1m/s |
| 07:00 ☾ | -8.3°C | 0.38mm | 96% | 0.38cm | -7.8°C | 0.63mm | 0.01kPa | 2.5m/s |
| 08:00 ☾ | -8°C | 0.92mm | 96% | 0.92cm | -7.5°C | 1.3mm | 0.01kPa | 1.9m/s |
| 09:00 ☾ | -7.4°C | 0.57mm | 95% | 0.57cm | -6.8°C | 2mm | 0.02kPa | 2m/s |
| 10:00 ☾ | -6.7°C | 0.54mm | 93% | 0.54cm | -5.8°C | 2.4mm | 0.03kPa | 1.7m/s |
| 11:00 ☾ | -6°C | 0.53mm | 92% | 0.53cm | -4.9°C | 2.8mm | 0.03kPa | 2m/s |
| 12:00 ☾ | -5.4°C | 0.42mm | 93% | 0.42cm | -4.5°C | 0.56mm | 0.03kPa | 3.1m/s |
| 13:00 ☾ | -4.7°C | 0.33mm | 91% | 0.34cm | -3.4°C | 0.75mm | 0.04kPa | 3.5m/s |
| 14:00 ☾ | -4.6°C | 0.17mm | 90% | 0.17cm | -3.2°C | 1.3mm | 0.05kPa | 5.1m/s |
| 15:00 ☾ | -4.2°C | 0.06mm | 87% | 0.06cm | -2.3°C | 1.3mm | 0.07kPa | 4.4m/s |
| 16:00 ☾ | -3.7°C | 0.3mm | 94% | 0.39cm | -2.9°C | 1.6mm | 0.03kPa | 3.1m/s |
| 17:00 ☾ | -3.8°C | 0.49mm | 96% | 0.61cm | -3.2°C | 2.1mm | 0.02kPa | 2.6m/s |
| 18:00 ☾ | -4.5°C | 0.63mm | 98% | 0.64cm | -4.2°C | 0.81mm | 0.01kPa | 1.1m/s |
| 19:00 ☾ | -5.2°C | 1.7mm | 98% | 1.7cm | -4.8°C | 2.1mm | 0.01kPa | 0.91m/s |
| 20:00 ☾ | -5.2°C | 2mm | 98% | 2cm | -4.9°C | 3.8mm | 0.01kPa | 1.1m/s |
| 21:00 ☾ | -5°C | 2.1mm | 97% | 2.3cm | -4.6°C | 5.9mm | 0.01kPa | 3.8m/s |
| 22:00 ☾ | -6.5°C | 0.01mm | 98% | 0cm | -6.3°C | 6.4mm | 0.01kPa | 1.6m/s |
| 23:00 ☾ | -9.4°C | 0mm | 98% | 0cm | -9.1°C | 6.5mm | 0.01kPa | 1.8m/s |
| Tue, Feb 24
Sunrise 07:38
Sunset 18:13 | ||||||||
| 24:00 ☾ | -13°C | 0.01mm | 100% | 0cm | -13°C | 0.06mm | 0kPa | 2m/s |
| 01:00 ☾ | -11°C | 0.01mm | 100% | 0cm | -11°C | 0.06mm | 0kPa | 2.4m/s |
| 02:00 ☾ | -8.2°C | 0.01mm | 98% | 0cm | -7.9°C | 0.06mm | 0.01kPa | 2.1m/s |
| 03:00 ☾ | -8.2°C | 0.02mm | 96% | 0cm | -7.6°C | 0.13mm | 0.02kPa | 2m/s |
| 04:00 ☾ | -8.4°C | 0.02mm | 94% | 0cm | -7.5°C | 0.13mm | 0.02kPa | 1.8m/s |
| 05:00 ☾ | -8.5°C | 0.02mm | 92% | 0cm | -7.5°C | 0.13mm | 0.03kPa | 2m/s |
| 06:00 ☾ | -8.9°C | 0.02mm | 91% | 0cm | -7.7°C | 0mm | 0.03kPa | 1.7m/s |
| 07:00 ☾ | -9.2°C | 0.02mm | 91% | 0cm | -8°C | 0.06mm | 0.03kPa | 1.6m/s |
| 08:00 ☾ | -9.4°C | 0.03mm | 90% | 0.03cm | -8°C | 0.06mm | 0.03kPa | 1.6m/s |
| 09:00 ☾ | -9.2°C | 0.03mm | 89% | 0.03cm | -7.7°C | 0.06mm | 0.04kPa | 1.8m/s |
| 10:00 ☾ | -9.2°C | 0.04mm | 86% | 0.04cm | -7.2°C | 0.13mm | 0.05kPa | 2.1m/s |
| 11:00 ☾ | -8.9°C | 0.03mm | 83% | 0.04cm | -6.4°C | 0.19mm | 0.06kPa | 2m/s |
| 12:00 ☾ | -8.4°C | 0.01mm | 81% | 0.03cm | -5.6°C | 0.06mm | 0.08kPa | 2.2m/s |
| 13:00 ☾ | -8.2°C | 0mm | 78% | 0cm | -4.9°C | 0.06mm | 0.09kPa | 2.5m/s |
| 14:00 ☾ | -8.4°C | 0mm | 74% | 0cm | -4.6°C | 0.06mm | 0.11kPa | 2.7m/s |
| 15:00 ☾ | -8.6°C | 0mm | 73% | 0cm | -4.5°C | 0.13mm | 0.12kPa | 2.8m/s |
| 16:00 ☾ | -8.9°C | 0mm | 74% | 0cm | -4.9°C | 0.13mm | 0.11kPa | 2.9m/s |
| 17:00 ☾ | -8.4°C | 0mm | 83% | 0cm | -5.9°C | 0.13mm | 0.07kPa | 2.5m/s |
| 18:00 ☾ | -12°C | 0mm | 93% | 0cm | -11°C | 0mm | 0.02kPa | 1.8m/s |
| 19:00 ☾ | -16°C | 0.01mm | 99% | 0cm | -16°C | 0mm | 0kPa | 2m/s |
| 20:00 ☾ | -16°C | 0.01mm | 100% | 0cm | -16°C | 0mm | 0kPa | 2.1m/s |
| 21:00 ☾ | -16°C | 0.02mm | 100% | 0cm | -16°C | 0.06mm | 0kPa | 2m/s |
| 22:00 ☾ | -16°C | 0.03mm | 100% | 0.03cm | -16°C | 0.06mm | 0kPa | 1.8m/s |
| 23:00 ☾ | -13°C | 0.04mm | 96% | 0.04cm | -13°C | 0.13mm | 0.01kPa | 1.8m/s |
| Wed, Feb 25
Sunrise 07:36
Sunset 18:15 | ||||||||
| 24:00 ☾ | -15°C | 0.03mm | 97% | 0.03cm | -15°C | 0.08mm | 0.01kPa | 1.5m/s |
| 01:00 ☾ | -17°C | 0.02mm | 99% | 0.01cm | -17°C | 0.04mm | 0kPa | 1.2m/s |
| 02:00 ☾ | -19°C | 0.01mm | 100% | 0cm | -19°C | 0mm | 0kPa | 0.94m/s |
| 03:00 ☾ | -16°C | 0.02mm | 98% | 0.01cm | -16°C | 0.02mm | 0kPa | 2m/s |
| 04:00 ☾ | -14°C | 0.02mm | 96% | 0.02cm | -13°C | 0.04mm | 0.01kPa | 3m/s |
| 05:00 ☾ | -11°C | 0.03mm | 94% | 0.04cm | -10°C | 0.06mm | 0.02kPa | 4m/s |
| 06:00 ☾ | -10°C | 0.02mm | 89% | 0.03cm | -9°C | 0.06mm | 0.03kPa | 5.4m/s |
| 07:00 ☾ | -10°C | 0.02mm | 85% | 0.03cm | -8°C | 0.06mm | 0.05kPa | 6.7m/s |
| 08:00 ☾ | -9.8°C | 0.01mm | 80% | 0.02cm | -7°C | 0.06mm | 0.07kPa | 8m/s |
| 09:00 ☾ | -9.6°C | 0.01mm | 84% | 0.02cm | -7.5°C | 0.1mm | 0.05kPa | 8.3m/s |
| 10:00 ☾ | -9.5°C | 0.02mm | 88% | 0.02cm | -7.9°C | 0.15mm | 0.04kPa | 8.6m/s |
| 11:00 ☾ | -9.4°C | 0.02mm | 92% | 0.02cm | -8.3°C | 0.19mm | 0.03kPa | 8.8m/s |
| 12:00 ☾ | -10°C | 0.02mm | 95% | 0.02cm | -9.7°C | 0.17mm | 0.02kPa | 7.1m/s |
| 13:00 ☾ | -11°C | 0.02mm | 97% | 0.02cm | -11°C | 0.15mm | 0.01kPa | 5.4m/s |
| 14:00 ☾ | -12°C | 0.02mm | 100% | 0.02cm | -12°C | 0.13mm | 0kPa | 3.7m/s |
| 15:00 ☾ | -13°C | 0.02mm | 100% | 0.02cm | -13°C | 0.15mm | 0kPa | 4.1m/s |
| 16:00 ☾ | -13°C | 0.02mm | 100% | 0.02cm | -13°C | 0.17mm | 0kPa | 4.4m/s |
| 17:00 ☾ | -13°C | 0.02mm | 100% | 0.02cm | -13°C | 0.19mm | 0kPa | 4.8m/s |
How to read: these inputs help produce the derived score; they are not requirements by themselves.
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