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Rule Fog Hunter

The Trossachs Pier - Fog Hunter - Trossachs & Loch Lomond

Callander, Scotland, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread2.0°C
Visibility24135 (Clear)
Relative Humidity87%
Wind Speed2.3m/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
The Trossachs Pier
Wed, Apr 15 · 22:00–23:00 · 1h window
Low confidence
30%
🌫️Fog Probability62.7%
Dewpoint Spread: 0.5°C
Visibility: 24135 (Clear)
Relative Humidity: 97%
Wind Speed: 1.5m/s (calm conditions)

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 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Wed, Apr 8
02:000%
03:0022%
04:0032%
05:0041%
06:0047%
07:0055%
08:0099%
09:0056%
10:0032%
11:000%
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22:0057%
23:0057%
Thu, Apr 9
24:0057%
01:0063%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:0059%
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20:0015%
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23:000%
Fri, Apr 10
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
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09:000%
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Sat, Apr 11
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
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20:000%
21:000%
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 06:26 Sunset 20:11
03:00 ☾
0% 5.8°C 0.01mm 87% 0cm -23° 7.8°C 0mm 0.14kPa 24135m 5.9m/s 2.3m/s
04:00 ☾
0% 5.1°C 0mm 84% 0cm -18° 7.6°C 0mm 0.16kPa 24135m 6.1m/s 2.4m/s
05:00 ☾
0% 5.7°C 0.99mm 92% 0cm -12° 6.9°C 0.5mm 0.08kPa 9750m 6.1m/s 2.5m/s
06:00 ☾
0% 6.2°C 2.9mm 98% 0cm -4.2° 6.5°C 3.3mm 0.02kPa 5437m 5.1m/s 2.2m/s
07:00
0% 6.3°C 0.18mm 99% 0cm 4° 6.5°C 4.6mm 0.01kPa 1075m 5m/s 2.6m/s
08:00
0% 6.3°C 0.9mm 99% 0cm 12° 6.5°C 0.69mm 0.01kPa 361m 6.3m/s 2.9m/s
09:00
0% 4.9°C 0.65mm 93% 0cm 20° 5.9°C 2.1mm 0.07kPa 9253m 9m/s 4.3m/s
10:00
0% 3.5°C 0.07mm 94% 0cm 28° 4.3°C 2.6mm 0.05kPa 10184m 8.7m/s 2.4m/s
11:00
0% 3.3°C 0.01mm 91% 0cm 34° 4.7°C 2.8mm 0.08kPa 23359m 8.6m/s 3.3m/s
12:00
0% 2.1°C 0mm 79% 0cm 39° 5.5°C 2.9mm 0.19kPa 8563m 10m/s 5.6m/s
13:00
0% 0.5°C 0mm 66% 0cm 41° 6.5°C 3.1mm 0.33kPa 24135m 11m/s 6.1m/s
14:00
4% 0.4°C 0mm 63% 0cm 41° 6.9°C 0.06mm 0.37kPa 24135m 12m/s 7.9m/s
15:00
7% -0.3°C 0mm 60% 0.07cm 38° 7°C 0.19mm 0.4kPa 24134m 13m/s 8.1m/s
16:00
11% -0.5°C 0mm 61% 0.07cm 32° 6.5°C 0.25mm 0.38kPa 22678m 13m/s 8.6m/s
17:00
12% 2.8°C 0.15mm 86% 0cm 25° 5°C 0.5mm 0.13kPa 1474m 14m/s 8.1m/s
18:00
13% 2.4°C 0.02mm 91% 0cm 17° 3.7°C 0.69mm 0.07kPa 5746m 13m/s 6.3m/s
19:00
14% 2°C 0.04mm 87% 0cm 9.1° 3.9°C 0.94mm 0.1kPa 4697m 13m/s 6.3m/s
20:00
17% 2.5°C 0.05mm 95% 0cm 1.1° 3.3°C 0.31mm 0.04kPa 2716m 13m/s 5.2m/s
21:00 ☾
20% 1.4°C 0mm 86% 0cm -7° 3.6°C 0.44mm 0.11kPa 24048m 12m/s 6m/s
22:00 ☾
23% 1°C 0mm 90% 0cm -14° 2.5°C 0.44mm 0.08kPa 24134m 11m/s 4m/s
23:00 ☾
27% 0.3°C 0mm 83% 0cm -20° 3°C 0.44mm 0.13kPa 24135m 11m/s 4.7m/s
Fri, Apr 10 Sunrise 06:26 Sunset 20:11
24:00 ☾
32% -0.2°C 0mm 85% 0cm -24° 2.1°C 0.44mm 0.11kPa 24134m 8.5m/s 4m/s
01:00 ☾
36% -1.1°C 0mm 84% 0cm -26° 1.3°C 0.5mm 0.11kPa 24135m 8.1m/s 3.7m/s
02:00 ☾
56% -1.8°C 0mm 86% 0cm -25° 0.35°C 0mm 0.09kPa 24134m 4.7m/s 2.6m/s
03:00 ☾
75% -2°C 0mm 88% 0cm -22° -0.31°C 0mm 0.07kPa 24134m 2.3m/s 2.3m/s
04:00 ☾
95% -2.2°C 0mm 89% 0cm -18° -0.68°C 0mm 0.06kPa 24135m 1.7m/s 1.9m/s
05:00 ☾
96% -2.3°C 0mm 89% 0cm -11° -0.75°C 0mm 0.06kPa 24134m 1.4m/s 1.5m/s
06:00 ☾
96% -2.5°C 0mm 89% 0cm -3.9° -0.93°C 0mm 0.06kPa 24134m 1.4m/s 1.5m/s
07:00
97% -2.3°C 0mm 88% 0cm 4.3° -0.61°C 0mm 0.07kPa 24135m 1m/s 1.1m/s
08:00
84% -1.7°C 0mm 82% 0cm 13° 1°C 0mm 0.12kPa 24134m 1.3m/s 1m/s
09:00
70% -1.3°C 0mm 74% 0cm 21° 2.8°C 0mm 0.19kPa 24134m 2.1m/s 1.5m/s
10:00
57% -1.2°C 0mm 70% 0cm 28° 3.8°C 0mm 0.24kPa 24135m 3.1m/s 2.2m/s
11:00
50% -1.1°C 0mm 66% 0.07cm 35° 4.6°C 0.06mm 0.29kPa 13537m 3.6m/s 2.8m/s
12:00
42% -1.2°C 0mm 63% 0.14cm 39° 5.3°C 0.19mm 0.33kPa 9790m 5m/s 3.9m/s
13:00
35% -1.8°C 0mm 60% 0.08cm 42° 5.4°C 0.25mm 0.36kPa 21500m 5.8m/s 4.3m/s
14:00
24% -2.9°C 0mm 51% 0.03cm 41° 6.6°C 0.06mm 0.48kPa 23077m 6.9m/s 4.8m/s
15:00
12% -3.2°C 0mm 50% 0cm 38° 6.4°C 0.06mm 0.48kPa 24134m 8m/s 4.9m/s
16:00
1% -2.1°C 0mm 53% 0.05cm 32° 6.8°C 0.13mm 0.47kPa 22337m 9.7m/s 6.6m/s
17:00
1% -2.1°C 0mm 54% 0cm 25° 6.5°C 0.13mm 0.45kPa 24134m 11m/s 7.1m/s
18:00
0% -2.1°C 0mm 57% 0cm 18° 5.8°C 0.13mm 0.4kPa 24135m 13m/s 6.9m/s
19:00
0% -1.9°C 0mm 62% 0cm 9.4° 4.8°C 0.13mm 0.33kPa 24135m 13m/s 6.6m/s
20:00
0% -1.3°C 0mm 68% 0cm 1.4° 4°C 0mm 0.26kPa 24135m 13m/s 6.4m/s
21:00 ☾
0% -1.3°C 0mm 70% 0cm -6.7° 3.7°C 0mm 0.24kPa 24134m 13m/s 6.4m/s
22:00 ☾
0% -0.8°C 0mm 73% 0cm -14° 3.7°C 0mm 0.22kPa 24135m 14m/s 7.1m/s
23:00 ☾
0% 0.8°C 1.3mm 87% 1.3cm -20° 2.8°C 0.63mm 0.1kPa 9811m 15m/s 6.6m/s
Sat, Apr 11 Sunrise 06:24 Sunset 20:13
24:00 ☾
0% 1°C 0.32mm 88% 0.32cm -24° 2.9°C 1.2mm 0.09kPa 19962m 15m/s 7.1m/s
01:00 ☾
0% 1.6°C 0.31mm 92% 0.31cm -25° 2.8°C 1.4mm 0.06kPa 8278m 16m/s 7.3m/s
02:00 ☾
0% 1.9°C 1.9mm 96% 1.9cm -25° 2.5°C 1.3mm 0.03kPa 2774m 16m/s 7.1m/s
03:00 ☾
0% 1.9°C 0.59mm 97% 0cm -22° 2.4°C 2.3mm 0.02kPa 644m 20m/s 6.1m/s
04:00 ☾
0% 2.8°C 3.1mm 98% 0cm -17° 3.2°C 4.3mm 0.02kPa 165m 15m/s 6.9m/s
05:00 ☾
0% 1.1°C 0mm 95% 0.04cm -11° 1.9°C 4.9mm 0.04kPa 14434m 13m/s 6m/s
06:00 ☾
0% 0.7°C 0mm 92% 0.05cm -3.5° 1.8°C 4.9mm 0.05kPa 14504m 13m/s 6.3m/s
07:00
0% 0.2°C 0mm 90% 0.02cm 4.6° 1.7°C 4.9mm 0.07kPa 22626m 12m/s 5.7m/s
08:00
0% -0.2°C 0mm 76% 0.01cm 13° 3.7°C 3.3mm 0.19kPa 23129m 12m/s 6.3m/s
09:00
0% -1.1°C 0mm 62% 0.007cm 21° 5.8°C 1.7mm 0.35kPa 23632m 12m/s 6.9m/s
10:00
0% -2.7°C 0mm 48% 0cm 29° 7.8°C 0.06mm 0.55kPa 24135m 12m/s 7.5m/s
11:00
1% -1.4°C 0.003mm 55% 0cm 35° 7°C 0.06mm 0.45kPa 24135m 13m/s 7.5m/s
12:00
1% -0.4°C 0.007mm 62% 0cm 40° 6.3°C 0.06mm 0.36kPa 24135m 15m/s 7.5m/s
13:00
2% 0.4°C 0.01mm 70% 0cm 42° 5.5°C 0.06mm 0.27kPa 24135m 16m/s 7.5m/s
14:00
13% 1°C 0.09mm 74% 0cm 42° 5.2°C 0.08mm 0.23kPa 23977m 16m/s 7.6m/s
15:00
23% 1.6°C 0.16mm 79% 0cm 38° 4.9°C 0.1mm 0.18kPa 23819m 17m/s 7.7m/s
16:00
34% 2.1°C 0.24mm 84% 0cm 33° 4.6°C 0.13mm 0.14kPa 23660m 17m/s 7.9m/s
17:00
25% 2.4°C 0.16mm 82% 0cm 26° 5.2°C 0.31mm 0.16kPa 23572m 16m/s 7.3m/s
18:00
16% 2.7°C 0.08mm 80% 0cm 18° 5.8°C 0.5mm 0.18kPa 23483m 15m/s 6.8m/s
19:00
7% 3°C 0mm 79% 0cm 9.6° 6.4°C 0.69mm 0.21kPa 23395m 14m/s 6.2m/s
20:00
14% 3°C 0.03mm 79% 0cm 1.6° 6.3°C 0.81mm 0.2kPa 23223m 14m/s 6.7m/s
21:00 ☾
22% 3.1°C 0.05mm 80% 0cm -6.5° 6.3°C 0.94mm 0.19kPa 23050m 15m/s 7.1m/s
22:00 ☾
29% 3.1°C 0.08mm 80% 0cm -13° 6.2°C 1.1mm 0.18kPa 22878m 16m/s 7.5m/s
23:00 ☾
25% 2.6°C 0.11mm 81% 0cm -19° 5.7°C 1.5mm 0.18kPa 23189m 15m/s 7.4m/s
Sun, Apr 12 Sunrise 06:21 Sunset 20:15
24:00 ☾
22% 2.1°C 0.15mm 81% 0cm -23° 5.1°C 1.9mm 0.17kPa 23501m 15m/s 7.3m/s
01:00 ☾
18% 1.6°C 0.18mm 81% 0cm -25° 4.6°C 2.3mm 0.16kPa 23812m 14m/s 7.2m/s
02:00 ☾
17% 2.4°C 0.18mm 86% 0cm -25° 4.5°C 2.8mm 0.12kPa 16212m 14m/s 7.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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