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Rule Fog Hunter

Loch Chon - Fog Hunter - Trossachs & Loch Lomond

Aberfoyle, Scotland, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread1.3°C
Visibility24135 (Clear)
Relative Humidity91%
Wind Speed2.2m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Moderate Fog at Dusk
Loch Chon
Wed, Apr 15 · 21:00–22:00 · 1h window
Medium confidence
40%
🌫️Fog Probability74.6%
Dewpoint Spread: 0.4°C
Visibility: 24135 (Clear)
Relative Humidity: 97%
Wind Speed: 1.1m/s (calm conditions)
fog weather icon
Moderate Fog
Loch Chon
Wed, Apr 15 · 22:00–24:00
🌫️Fog Probability:62.7-74.6%
Low

What this forecast looks for

Plain-language explanation from the rule

This forecast identifies when fog and mist conditions create atmospheric photography opportunities across the Trossachs lochs and glens. We track temperature, humidity, wind, and overnight cooling to predict when dawn mist will form over forest-fringed lochs and settle into wooded valleys.

The Trossachs—"the Highlands in miniature"—sits where Lowland Scotland meets the Highlands, creating perfect conditions for mist formation. Cool Highland air draining down valleys meets warmer air over the lochs, while dense oak and birch forests trap moisture overnight. The result is frequent dawn mist that transforms intimate lochs and wooded glens into scenes of ethereal beauty.

What makes the Trossachs special for fog photography:

  • Forest-fringed lochs - Loch Ard and Loch Chon with native woodland creating layered mist scenes
  • Valley fog formation - Glen Finglas and other glens trap overnight mist between mountains
  • Intimate scale - Smaller lochs allow compositions that capture both mist and reflections
  • Seasonal reliability - Autumn (September-November) brings most reliable mist conditions with calm nights

Loch Ard near Aberfoyle offers the Trossachs' most reliable dawn mist—native forest comes right to the water's edge, creating layered compositions as mist rises through trees. The forest pier at dawn with mist swirling around ancient oaks is magical. Loch Chon, deeper into the forest, sees even more atmospheric conditions due to its remote, sheltered position. The Trossachs Pier on Loch Katrine with the historic steamship and Ben Venue emerging from mist creates classic Scottish landscape scenes. Timing is critical—arrive in darkness, position yourself 30 minutes before sunrise, and capture the 1-2 hour window as mist lifts and breaks. Conditions change rapidly once sun hits the water.

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 91 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Wed, Apr 8
06:0055%
07:0059%
08:00100%
09:0077%
10:0044%
11:000%
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22:0039%
23:0039%
Thu, Apr 9
24:000%
01:0039%
02:0039%
03:000%
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Fri, Apr 10
24:000%
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Sat, Apr 11
24:000%
01:000%
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22:000%
23:000%
Sun, Apr 12
24:000%
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
Europe/London
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
Thu, Apr 9 Sunrise 06:27 Sunset 20:12
03:00 ☾
0% 6°C 0.01mm 91% 0cm -23° 7.3°C 0mm 0.09kPa 24135m 4.3m/s 2.2m/s
04:00 ☾
0% 5.4°C 0.28mm 89% 0cm -18° 7°C 0.06mm 0.11kPa 22576m 3.8m/s 2m/s
05:00 ☾
0% 5.7°C 2.3mm 95% 0cm -12° 6.4°C 0.94mm 0.05kPa 5650m 3.8m/s 2.1m/s
06:00 ☾
0% 5.9°C 2.5mm 99% 0cm -4.4° 6.1°C 4.9mm 0.01kPa 2694m 2.2m/s 1.5m/s
07:00
0% 6°C 0.91mm 99% 0cm 3.9° 6.2°C 5.6mm 0.01kPa 351m 3.3m/s 2.2m/s
08:00
0% 5.9°C 1.6mm 98% 0cm 12° 6.1°C 1.2mm 0.01kPa 228m 4.6m/s 1.8m/s
09:00
0% 3.2°C 1mm 94% 0cm 20° 4°C 2.9mm 0.05kPa 3013m 11m/s 3.6m/s
10:00
0% 3.5°C 0.07mm 96% 0cm 28° 4.1°C 3.4mm 0.04kPa 5232m 9.2m/s 2.6m/s
11:00
0% 2.9°C 0.01mm 93% 0cm 34° 4°C 3.6mm 0.06kPa 10037m 9.7m/s 3.3m/s
12:00
0% 1.8°C 0mm 80% 0cm 39° 4.8°C 3.7mm 0.17kPa 13253m 11m/s 6.1m/s
13:00
0% 0.8°C 0mm 69% 0cm 41° 6.1°C 3.8mm 0.29kPa 24135m 12m/s 7.1m/s
14:00
7% 0.4°C 0mm 65% 0.11cm 41° 6.4°C 0.06mm 0.33kPa 24135m 12m/s 7.9m/s
15:00
15% -0.5°C 0mm 62% 0.09cm 38° 6.1°C 0.19mm 0.36kPa 23777m 13m/s 8m/s
16:00
22% 0.4°C 0mm 68% 0.2cm 32° 5.9°C 0.25mm 0.3kPa 8174m 14m/s 8.1m/s
17:00
20% 2.7°C 0.28mm 91% 0cm 25° 4°C 0.63mm 0.07kPa 1343m 13m/s 7.2m/s
18:00
17% 2.2°C 0.05mm 93% 0cm 17° 3.3°C 0.88mm 0.06kPa 5257m 14m/s 7.2m/s
19:00
15% 2.1°C 0.27mm 92% 0cm 9.2° 3.3°C 1.3mm 0.07kPa 3056m 14m/s 6.9m/s
20:00
16% 2.3°C 0.07mm 95% 0cm 1.2° 3°C 0.44mm 0.04kPa 3356m 13m/s 6.1m/s
21:00 ☾
18% 1.5°C 0.06mm 91% 0cm -7° 2.9°C 0.56mm 0.07kPa 16340m 12m/s 5.6m/s
22:00 ☾
19% 1°C 0.03mm 92% 0.07cm -14° 2.2°C 0.63mm 0.06kPa 13693m 11m/s 4.2m/s
23:00 ☾
20% 0.2°C 0mm 85% 0cm -20° 2.4°C 0.63mm 0.11kPa 19094m 10m/s 4.1m/s
Fri, Apr 10 Sunrise 06:27 Sunset 20:12
24:00 ☾
21% -0.6°C 0mm 84% 0cm -24° 1.8°C 0.69mm 0.11kPa 24134m 10m/s 4.3m/s
01:00 ☾
22% -1.7°C 0mm 82% 0cm -26° 1°C 0.69mm 0.12kPa 24135m 11m/s 3.8m/s
02:00 ☾
46% -2.1°C 0mm 87% 0cm -25° -0.15°C 0mm 0.08kPa 24134m 1.8m/s 2m/s
03:00 ☾
70% -2.3°C 0mm 90% 0cm -23° -0.81°C 0mm 0.06kPa 24134m 1.6m/s 1.8m/s
04:00 ☾
94% -2.4°C 0mm 90% 0cm -18° -0.98°C 0mm 0.06kPa 24135m 1.4m/s 1.6m/s
05:00 ☾
94% -2.5°C 0mm 90% 0cm -11° -1.2°C 0mm 0.05kPa 24134m 1.2m/s 1.2m/s
06:00 ☾
94% -2.6°C 0mm 91% 0cm -4° -1.2°C 0mm 0.05kPa 24134m 1.1m/s 1.2m/s
07:00
94% -2.4°C 0mm 90% 0cm 4.2° -0.91°C 0mm 0.06kPa 24135m 0.92m/s 0.91m/s
08:00
79% -1.6°C 0mm 84% 0cm 12° 0.74°C 0mm 0.1kPa 24134m 1.2m/s 0.93m/s
09:00
65% -1.1°C 0mm 77% 0cm 21° 2.5°C 0mm 0.17kPa 24134m 1.6m/s 1.3m/s
10:00
50% -1.2°C 0mm 71% 0.04cm 28° 3.6°C 0mm 0.23kPa 21691m 2.9m/s 2.2m/s
11:00
41% -1.1°C 0mm 68% 0.11cm 35° 4.3°C 0.13mm 0.27kPa 5271m 3.5m/s 2.6m/s
12:00
33% -1°C 0.01mm 68% 0.15cm 39° 4.4°C 0.25mm 0.27kPa 4121m 5m/s 3.6m/s
13:00
24% -1.1°C 0mm 67% 0.11cm 42° 4.5°C 0.38mm 0.27kPa 11730m 6m/s 4m/s
14:00
16% -2.5°C 0mm 56% 0.04cm 41° 5.6°C 0.06mm 0.4kPa 19178m 7m/s 4.4m/s
15:00
9% -2.8°C 0mm 55% 0.03cm 38° 5.5°C 0.13mm 0.41kPa 21399m 7.9m/s 4.4m/s
16:00
1% -2.2°C 0.01mm 55% 0.06cm 33° 6.1°C 0.13mm 0.42kPa 12653m 9.5m/s 5.8m/s
17:00
1% -2°C 0mm 57% 0.02cm 26° 5.9°C 0.19mm 0.4kPa 24134m 11m/s 6.8m/s
18:00
0% -2.2°C 0mm 59% 0cm 18° 5.2°C 0.19mm 0.36kPa 24135m 13m/s 7.4m/s
19:00
0% -2.5°C 0mm 62% 0cm 9.5° 4.1°C 0.19mm 0.31kPa 24135m 14m/s 7.1m/s
20:00
0% -1.6°C 0.01mm 70% 0cm 1.5° 3.4°C 0mm 0.23kPa 24135m 14m/s 6.4m/s
21:00 ☾
0% -1°C 0.06mm 74% 0cm -6.7° 3.2°C 0mm 0.2kPa 24134m 14m/s 6m/s
22:00 ☾
0% -0.7°C 0.03mm 76% 0cm -14° 3.1°C 0.06mm 0.18kPa 24135m 14m/s 6.3m/s
23:00 ☾
0% 1°C 2mm 94% 2cm -20° 1.9°C 1mm 0.04kPa 2222m 16m/s 6.1m/s
Sat, Apr 11 Sunrise 06:24 Sunset 20:14
24:00 ☾
0% 1.1°C 0.32mm 93% 0.32cm -24° 2.2°C 1.9mm 0.05kPa 8445m 16m/s 6.1m/s
01:00 ☾
0% 1.4°C 1.4mm 96% 1.4cm -25° 2°C 2.7mm 0.03kPa 2638m 16m/s 5.9m/s
02:00 ☾
0% 1.5°C 3.8mm 98% 3.8cm -25° 1.8°C 2.7mm 0.01kPa 106m 15m/s 5.2m/s
03:00 ☾
0% 1.6°C 2.1mm 98% 2.1cm -22° 1.9°C 4.8mm 0.01kPa 99m 20m/s 5.5m/s
04:00 ☾
0% 2°C 2.6mm 99% 0cm -17° 2.2°C 8.2mm 0.01kPa 79m 11m/s 5.2m/s
05:00 ☾
0% 0.9°C 0.01mm 95% 0cm -11° 1.7°C 8.7mm 0.04kPa 15608m 12m/s 5m/s
06:00 ☾
0% 0.3°C 0mm 91% 0.08cm -3.6° 1.6°C 8.8mm 0.06kPa 11413m 12m/s 5.7m/s
07:00
0% 0°C 0.01mm 91% 0cm 4.5° 1.4°C 8.8mm 0.06kPa 20181m 12m/s 5.2m/s
08:00
0% -0.3°C 0.007mm 77% 0cm 13° 3.4°C 5.9mm 0.18kPa 21499m 12m/s 6.1m/s
09:00
0% -1.2°C 0.003mm 62% 0cm 21° 5.5°C 2.9mm 0.34kPa 22817m 12m/s 7m/s
10:00
0% -2.8°C 0mm 48% 0cm 29° 7.5°C 0mm 0.54kPa 24135m 12m/s 7.8m/s
11:00
0% -1.3°C 0mm 56% 0cm 35° 6.8°C 0.04mm 0.43kPa 24135m 13m/s 7.7m/s
12:00
1% -0.1°C 0mm 64% 0cm 40° 6.1°C 0.08mm 0.34kPa 24135m 14m/s 7.6m/s
13:00
1% 0.8°C 0mm 72% 0cm 42° 5.4°C 0.13mm 0.25kPa 24135m 15m/s 7.5m/s
14:00
9% 1.5°C 0.13mm 79% 0cm 42° 4.9°C 0.27mm 0.18kPa 21986m 15m/s 7.2m/s
15:00
18% 2.2°C 0.26mm 86% 0cm 38° 4.3°C 0.42mm 0.12kPa 19836m 15m/s 6.8m/s
16:00
26% 2.7°C 0.39mm 92% 0cm 33° 3.8°C 0.56mm 0.06kPa 17686m 15m/s 6.5m/s
17:00
18% 2.9°C 0.26mm 90% 0cm 26° 4.5°C 0.94mm 0.09kPa 17609m 15m/s 6.7m/s
18:00
11% 3.2°C 0.14mm 87% 0cm 18° 5.1°C 1.3mm 0.11kPa 17532m 15m/s 7m/s
19:00
3% 3.4°C 0.01mm 84% 0cm 9.7° 5.8°C 1.7mm 0.14kPa 17454m 15m/s 7.2m/s
20:00
7% 3.5°C 0.05mm 86% 0cm 1.7° 5.7°C 1.7mm 0.13kPa 19074m 15m/s 7.3m/s
21:00 ☾
12% 3.6°C 0.1mm 87% 0cm -6.4° 5.6°C 1.8mm 0.12kPa 20694m 15m/s 7.5m/s
22:00 ☾
16% 3.7°C 0.14mm 88% 0cm -13° 5.5°C 1.8mm 0.11kPa 22313m 16m/s 7.6m/s
23:00 ☾
13% 3.1°C 0.74mm 89% 0cm -19° 4.7°C 2.1mm 0.09kPa 16575m 16m/s 7.8m/s
Sun, Apr 12 Sunrise 06:22 Sunset 20:16
24:00 ☾
10% 2.5°C 1.3mm 90% 0cm -23° 3.9°C 2.4mm 0.08kPa 10836m 16m/s 8m/s
01:00 ☾
7% 1.9°C 1.9mm 92% 0cm -25° 3.1°C 2.7mm 0.06kPa 5098m 16m/s 8.2m/s
02:00 ☾
7% 2.6°C 1.4mm 93% 0cm -25° 3.7°C 2.9mm 0.06kPa 6624m 15m/s 8.1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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