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Rule Fog Hunter

Inversnaid - Fog Hunter - Trossachs & Loch Lomond

Inversnaid, Scotland, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
57%
Dewpoint Spread0.7°C
Visibility24135 (Clear)
Relative Humidity95%
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
Inversnaid
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
Inversnaid
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
3matching 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
06:0063%
07:0065%
08:00100%
09:0060%
10:000%
11:000%
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Thu, Apr 9
24:000%
01:0039%
02:0057%
03:0057%
04:0024%
05:000%
06:000%
07:000%
08:000%
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21:0016%
22:0012%
23:000%
Fri, Apr 10
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
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Sat, Apr 11
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
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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 06:28 Sunset 20:13
03:00 ☾
0% 6.3°C 0.09mm 95% 0cm -23° 7°C 0.06mm 0.05kPa 24135m 3.7m/s 2.2m/s
04:00 ☾
0% 5.8°C 0.7mm 95% 0cm -18° 6.6°C 0.25mm 0.05kPa 13587m 3.5m/s 2m/s
05:00 ☾
0% 5.7°C 3.6mm 98% 0cm -12° 6°C 1.3mm 0.02kPa 1691m 3.8m/s 2.4m/s
06:00 ☾
0% 5.7°C 0.95mm 99% 0cm -4.5° 5.9°C 4.9mm 0.01kPa 270m 3m/s 1.9m/s
07:00
0% 5.8°C 1.5mm 99% 0cm 3.7° 6°C 5.6mm 0.01kPa 147m 4.7m/s 2.5m/s
08:00
0% 4.7°C 1.9mm 96% 0cm 12° 5.2°C 1.9mm 0.03kPa 482m 8.3m/s 3.8m/s
09:00
0% 3.2°C 0.9mm 97% 0cm 20° 3.5°C 3.4mm 0.02kPa 128m 10m/s 2m/s
10:00
0% 3.3°C 0.16mm 96% 0cm 28° 3.8°C 3.9mm 0.03kPa 197m 10m/s 3.5m/s
11:00
0% 2.5°C 0.01mm 94% 0cm 34° 3.5°C 4.2mm 0.05kPa 6311m 10m/s 4m/s
12:00
0% 1.4°C 0mm 80% 0.21cm 39° 4.6°C 4.4mm 0.17kPa 10765m 11m/s 6.3m/s
13:00
0% 0.6°C 0mm 70% 0.05cm 41° 5.6°C 4.4mm 0.27kPa 24135m 12m/s 7.3m/s
14:00
7% 0.2°C 0mm 68% 0.14cm 41° 5.7°C 0.06mm 0.29kPa 22821m 12m/s 8.2m/s
15:00
15% -0.4°C 0mm 66% 0.06cm 38° 5.6°C 0.19mm 0.31kPa 24134m 13m/s 8.4m/s
16:00
22% 1.5°C 0.02mm 78% 0cm 32° 5.1°C 0.38mm 0.19kPa 1957m 15m/s 8.3m/s
17:00
20% 2.1°C 0.22mm 94% 0.31cm 25° 2.9°C 0.81mm 0.04kPa 132m 14m/s 7m/s
18:00
17% 2°C 0.27mm 93% 0cm 18° 3.1°C 1.1mm 0.05kPa 8381m 14m/s 7.2m/s
19:00
15% 2.2°C 0.55mm 95% 0cm 9.4° 2.8°C 1.7mm 0.04kPa 444m 14m/s 6.9m/s
20:00
16% 1.9°C 0.07mm 95% 0.18cm 1.4° 2.6°C 0.5mm 0.04kPa 2010m 13m/s 6.3m/s
21:00 ☾
18% 1.5°C 0.13mm 95% 0.25cm -6.8° 2.2°C 0.69mm 0.04kPa 3588m 11m/s 5.2m/s
22:00 ☾
19% 1°C 0.03mm 94% 0.11cm -14° 1.9°C 0.94mm 0.04kPa 3608m 11m/s 4.7m/s
23:00 ☾
20% -0.2°C 0.01mm 87% 0.1cm -20° 1.8°C 1.1mm 0.09kPa 9265m 9.9m/s 4.1m/s
Fri, Apr 10 Sunrise 06:28 Sunset 20:13
24:00 ☾
21% -1°C 0mm 84% 0.05cm -24° 1.5°C 1.2mm 0.11kPa 24134m 11m/s 5.1m/s
01:00 ☾
22% -1.9°C 0.01mm 84% 0cm -26° 0.5°C 1.2mm 0.1kPa 24135m 11m/s 3.7m/s
02:00 ☾
46% -2.1°C 0mm 89% 0cm -25° -0.55°C 0mm 0.07kPa 24134m 1.7m/s 1.9m/s
03:00 ☾
70% -2.4°C 0mm 91% 0cm -23° -1.1°C 0mm 0.05kPa 24134m 1.6m/s 1.8m/s
04:00 ☾
94% -2.4°C 0mm 91% 0cm -18° -1.2°C 0mm 0.05kPa 24135m 1.5m/s 1.7m/s
05:00 ☾
94% -2.6°C 0mm 91% 0cm -12° -1.4°C 0mm 0.05kPa 24134m 1.4m/s 1.5m/s
06:00 ☾
94% -2.5°C 0mm 92% 0cm -4.1° -1.3°C 0mm 0.05kPa 24134m 1.4m/s 1.5m/s
07:00
94% -2.3°C 0mm 91% 0cm 4° -1°C 0mm 0.05kPa 24135m 1.2m/s 1.2m/s
08:00
79% -1.6°C 0mm 85% 0cm 12° 0.54°C 0mm 0.09kPa 24134m 1.7m/s 1.2m/s
09:00
65% -1.3°C 0mm 78% 0cm 20° 2.1°C 0mm 0.16kPa 24134m 1.9m/s 1.4m/s
10:00
50% -1.2°C 0mm 72% 0.07cm 28° 3.4°C 0.06mm 0.22kPa 21018m 3m/s 2.2m/s
11:00
41% -1.3°C 0mm 68% 0.13cm 35° 4°C 0.13mm 0.26kPa 4730m 3.5m/s 2.5m/s
12:00
33% -1.4°C 0mm 68% 0.13cm 39° 3.9°C 0.31mm 0.26kPa 4815m 4.7m/s 3m/s
13:00
24% -1.7°C 0mm 66% 0.09cm 42° 4.1°C 0.38mm 0.28kPa 12913m 6m/s 3.7m/s
14:00
16% -2.4°C 0mm 59% 0.04cm 41° 5°C 0.06mm 0.36kPa 24134m 7.5m/s 4.6m/s
15:00
9% -2.2°C 0mm 60% 0.06cm 38° 4.9°C 0.13mm 0.34kPa 20666m 8.7m/s 5m/s
16:00
1% -1.4°C 0.01mm 62% 0.07cm 33° 5.3°C 0.19mm 0.34kPa 8044m 9.8m/s 5.5m/s
17:00
1% -1.8°C 0mm 60% 0.03cm 26° 5.3°C 0.25mm 0.35kPa 24134m 11m/s 6.6m/s
18:00
0% -2.1°C 0mm 61% 0cm 18° 4.8°C 0.25mm 0.33kPa 24135m 13m/s 7.3m/s
19:00
0% -2.7°C 0mm 64% 0cm 9.6° 3.5°C 0.25mm 0.28kPa 24135m 15m/s 7.6m/s
20:00
0% -1.8°C 0.01mm 72% 0cm 1.6° 2.8°C 0mm 0.21kPa 24135m 15m/s 7.1m/s
21:00 ☾
0% -0.6°C 0.08mm 80% 0.08cm -6.5° 2.5°C 0.06mm 0.15kPa 24134m 15m/s 6.2m/s
22:00 ☾
0% -0.4°C 0.16mm 80% 0.16cm -14° 2.6°C 0.13mm 0.14kPa 24135m 16m/s 6.7m/s
23:00 ☾
0% 0.9°C 1.8mm 97% 1.8cm -19° 1.3°C 1.3mm 0.02kPa 124m 16m/s 5.6m/s
Sat, Apr 11 Sunrise 06:25 Sunset 20:15
24:00 ☾
0% 1.1°C 0.17mm 95% 0.17cm -23° 1.8°C 2mm 0.03kPa 907m 17m/s 7m/s
01:00 ☾
0% 1.2°C 2.4mm 97% 2.4cm -25° 1.6°C 3.7mm 0.02kPa 83m 17m/s 5.9m/s
02:00 ☾
0% 1°C 3.3mm 99% 3.3cm -25° 1.2°C 3.6mm 0.01kPa 70m 17m/s 4.9m/s
03:00 ☾
0% 1.3°C 4.8mm 99% 4.8cm -22° 1.5°C 6.6mm 0.01kPa 67m 19m/s 5.1m/s
04:00 ☾
0% 1.2°C 1.7mm 99% 1.8cm -18° 1.4°C 11mm 0.01kPa 69m 11m/s 4.3m/s
05:00 ☾
0% 0.6°C 0.01mm 95% 0.1cm -11° 1.3°C 11mm 0.03kPa 5058m 12m/s 4.6m/s
06:00 ☾
0% 0°C 0mm 91% 0.07cm -3.8° 1.3°C 12mm 0.06kPa 16071m 12m/s 4.7m/s
07:00
0% -0.1°C 0.01mm 90% 0.04cm 4.4° 1.3°C 12mm 0.06kPa 13051m 11m/s 4.5m/s
08:00
0% -0.4°C 0.007mm 76% 0.03cm 13° 3.4°C 7.7mm 0.18kPa 16746m 11m/s 5.6m/s
09:00
0% -1.2°C 0.003mm 62% 0.01cm 21° 5.4°C 3.9mm 0.34kPa 20440m 11m/s 6.7m/s
10:00
0% -2.8°C 0mm 48% 0cm 28° 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 9.9° 5.8°C 1.7mm 0.14kPa 17454m 15m/s 7.2m/s
20:00
7% 3.5°C 0.05mm 86% 0cm 1.9° 5.7°C 1.7mm 0.13kPa 19074m 15m/s 7.3m/s
21:00 ☾
12% 3.6°C 0.1mm 87% 0cm -6.2° 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 06:23 Sunset 20:17
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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