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Rule Fog Hunter

Beddgelert - Fog Hunter - Snowdonia (Eryri)

Beddgelert, Wales, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread0.3°C
Visibility327 (Fog)
Relative Humidity97%
Wind Speed11.5m/s (moderate winds)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
fog weather icon
Next opportunity
Dense Fog
Beddgelert
Sat, Apr 18 · 22:00–01:00 · 3h window
Low confidence
27%
🌫️Fog Probability62.7-88.6%
Dewpoint Spread: 0.4°C
Visibility: 24135 (Clear)
Relative Humidity: 97%
Wind Speed: 2.0m/s (calm conditions)

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks when valley inversions and mountain mist create atmospheric conditions for photography in Snowdonia's glacial valleys. We monitor temperature inversions, humidity patterns, and wind conditions to predict optimal fog photography opportunities.

Snowdonia's deep glacial valleys—Nant Gwynant, Llanberis Pass, and Ogwen Valley—act as natural fog bowls where cold air settles overnight, creating spectacular valley inversions with mountain peaks rising through cloud seas. The region's high rainfall and numerous lakes add moisture to the atmosphere, producing frequent mist conditions that transform slate landscapes and mountain tarns into ethereal scenes.

What makes Snowdonia fog photography distinctive:

  • Valley inversions - Nant Gwynant and Ogwen Valley trap cold air, creating cloud seas with peaks emerging above
  • Lake mist - Llyn Padarn and Llyn Ogwen generate morning mist that drifts across mirror-still water
  • Slate atmosphere - Historic slate quarries at Llanberis create moody industrial landscapes in fog
  • Glacial cwms - Cwm Idwal's enclosed cirque traps mist, creating atmospheric waterfall scenes at Devil's Kitchen

The most reliable fog conditions occur during settled high-pressure periods in autumn and winter (September-February) when clear skies allow overnight cooling to create temperature inversions. Nant Gwynant valley is particularly prone to inversions—position yourself at higher viewpoints like Pen-y-Gwryd or along the A498 to capture peaks rising through cloud. Llyn Padarn generates morning mist that drifts past Dolbadarn Castle's tower, creating atmospheric castle scenes. Cwm Idwal's enclosed glacial bowl traps mist against the dramatic headwall of Devil's Kitchen. The timing is critical—arrive before dawn as mist typically burns off within an hour or two of sunrise. Wales's wet climate means fog is common, but our forecast identifies the photogenic conditions when visibility is just right—not too thick to lose definition, not too thin to lack atmosphere.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 86 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Sat, Apr 11
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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Sun, Apr 12
24:000%
01:000%
02:000%
03:000%
04:000%
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07:000%
08:000%
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23:0037%
Mon, Apr 13
24:0037%
01:0043%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
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20:000%
21:0043%
22:0043%
23:0043%
Tue, Apr 14
24:0043%
01:0043%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
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17:000%
18:000%
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
Sat, Apr 11 Sunrise 06:27 Sunset 20:08
20:00
3% 3.5°C 1.7mm 97% 0cm 0.9° 3.8°C 1.2mm 0.02kPa 327m 22m/s 11m/s
21:00 ☾
2% 4.3°C 0.11mm 96% 0cm -7.9° 4.9°C 1.9mm 0.04kPa 1098m 20m/s 13m/s
22:00 ☾
0% 4.1°C 0.03mm 95% 0cm -16° 4.9°C 2.4mm 0.05kPa 4020m 19m/s 13m/s
23:00 ☾
0% 4.1°C 0.24mm 96% 0cm -22° 4.7°C 2.8mm 0.03kPa 1469m 18m/s 11m/s
Sun, Apr 12 Sunrise 06:27 Sunset 20:08
24:00 ☾
0% 3.9°C 0mm 92% 0cm -26° 5.2°C 3.3mm 0.08kPa 10454m 16m/s 11m/s
01:00 ☾
0% 3.9°C 0mm 92% 0cm -28° 5.2°C 4.1mm 0.07kPa 10669m 15m/s 10m/s
02:00 ☾
1% 3.8°C 0mm 92% 0cm -28° 5°C 0.56mm 0.07kPa 11769m 15m/s 9.9m/s
03:00 ☾
3% 3.6°C 0mm 90% 0cm -25° 5°C 1.4mm 0.08kPa 1731m 17m/s 11m/s
04:00 ☾
4% 3°C 0mm 88% 0cm -19° 4.9°C 1.8mm 0.11kPa 14613m 15m/s 9.6m/s
05:00 ☾
4% 3.1°C 0mm 90% 0cm -12° 4.5°C 2.1mm 0.08kPa 23260m 13m/s 8.6m/s
06:00 ☾
4% 3.3°C 0.02mm 91% 0cm -4.3° 4.7°C 2.3mm 0.08kPa 23392m 13m/s 8.9m/s
07:00
4% 3°C 0mm 90% 0cm 4.5° 4.5°C 2.4mm 0.08kPa 22940m 14m/s 9.6m/s
08:00
10% 2.9°C 0mm 89% 0cm 13° 4.5°C 0.13mm 0.09kPa 24135m 15m/s 10m/s
09:00
16% 3.1°C 0mm 86% 0cm 22° 5.2°C 0.19mm 0.12kPa 24135m 14m/s 9.7m/s
10:00
22% 3°C 0mm 82% 0cm 31° 5.9°C 0.25mm 0.17kPa 24134m 14m/s 9.4m/s
11:00
22% 2.5°C 0mm 78% 0cm 38° 6.1°C 0.31mm 0.21kPa 24135m 13m/s 10m/s
12:00
21% 2.2°C 0mm 74% 0cm 43° 6.5°C 0.31mm 0.25kPa 24135m 12m/s 9.5m/s
13:00
21% 1.8°C 0mm 72% 0cm 46° 6.5°C 0.38mm 0.27kPa 23284m 11m/s 8.8m/s
14:00
35% 1.5°C 0mm 71% 0cm 45° 6.3°C 0.13mm 0.28kPa 17673m 10m/s 8.2m/s
15:00
48% 1.4°C 0mm 66% 0cm 41° 7.2°C 0.31mm 0.34kPa 23498m 9.3m/s 7.7m/s
16:00
62% 1.3°C 0mm 66% 0cm 35° 7.2°C 0.44mm 0.34kPa 22455m 8.3m/s 6.9m/s
17:00
64% 1.6°C 0mm 69% 0cm 27° 6.8°C 0.56mm 0.3kPa 22011m 8.1m/s 6.6m/s
18:00
65% 2°C 0mm 76% 0cm 19° 6°C 0.75mm 0.23kPa 23288m 8.4m/s 6.3m/s
19:00
67% 2.1°C 0mm 80% 0cm 9.7° 5.3°C 0.94mm 0.18kPa 23151m 9.2m/s 5.4m/s
20:00
69% 1.7°C 0mm 86% 0cm 1.1° 3.8°C 0.06mm 0.12kPa 23227m 9.5m/s 4.7m/s
21:00 ☾
70% 1.7°C 0mm 91% 0cm -7.7° 3°C 0.06mm 0.07kPa 24135m 8.8m/s 3.9m/s
22:00 ☾
72% 1.7°C 0mm 92% 0cm -15° 2.9°C 0.06mm 0.06kPa 24135m 8.6m/s 3.6m/s
23:00 ☾
66% 1.6°C 0mm 93% 0cm -22° 2.5°C 0.06mm 0.05kPa 24135m 6.4m/s 3.2m/s
Mon, Apr 13 Sunrise 06:24 Sunset 20:10
24:00 ☾
60% 1.5°C 0mm 95% 0cm -26° 2.2°C 0.13mm 0.04kPa 24135m 3.9m/s 2.7m/s
01:00 ☾
54% 0.9°C 0mm 94% 0cm -28° 1.8°C 0.13mm 0.04kPa 24135m 2m/s 2.1m/s
02:00 ☾
46% 0.3°C 0mm 93% 0cm -27° 1.3°C 0mm 0.05kPa 24135m 1.6m/s 1.9m/s
03:00 ☾
37% -0.3°C 0mm 91% 0cm -24° 1°C 0mm 0.06kPa 24135m 1.7m/s 2m/s
04:00 ☾
29% -0.4°C 0mm 90% 0cm -19° 1.1°C 0mm 0.06kPa 24135m 1.7m/s 2m/s
05:00 ☾
27% -0.5°C 0mm 90% 0cm -12° 0.97°C 0mm 0.07kPa 24134m 1.8m/s 2m/s
06:00 ☾
25% -0.5°C 0mm 90% 0cm -3.9° 0.87°C 0mm 0.06kPa 24134m 1.9m/s 2.1m/s
07:00
23% 0.5°C 0.02mm 89% 0cm 4.9° 2.1°C 0mm 0.08kPa 24135m 3m/s 2.2m/s
08:00
24% 1.7°C 0mm 91% 0cm 14° 3°C 0mm 0.07kPa 24135m 3.9m/s 2.1m/s
09:00
25% 2.5°C 0mm 93% 0cm 23° 3.6°C 0mm 0.06kPa 24134m 3.7m/s 2.1m/s
10:00
26% 2.6°C 0mm 84% 0cm 31° 5.2°C 0.06mm 0.14kPa 24003m 5.1m/s 2.6m/s
11:00
25% 2.4°C 0mm 74% 0cm 38° 6.8°C 0.13mm 0.26kPa 23947m 5.8m/s 3.3m/s
12:00
24% 2.4°C 0mm 71% 0cm 43° 7.4°C 0.38mm 0.3kPa 16165m 6.3m/s 4.5m/s
13:00
23% 2.4°C 0mm 71% 0cm 46° 7.4°C 0.63mm 0.3kPa 23888m 6.2m/s 4.5m/s
14:00
27% 2.4°C 0mm 69% 0cm 45° 7.8°C 0.19mm 0.33kPa 24135m 6.1m/s 4.8m/s
15:00
31% 2.2°C 0mm 66% 0cm 41° 8.3°C 0.25mm 0.37kPa 24135m 5.8m/s 4.6m/s
16:00
35% 1.9°C 0mm 65% 0cm 35° 8.1°C 0.25mm 0.38kPa 24134m 5.3m/s 4.1m/s
17:00
40% 2°C 0mm 67% 0cm 28° 7.8°C 0.25mm 0.35kPa 24134m 4.7m/s 3.7m/s
18:00
44% 2.2°C 0mm 70% 0cm 19° 7.3°C 0.25mm 0.3kPa 24135m 4.2m/s 3.3m/s
19:00
49% 2.9°C 0mm 79% 0cm 10° 6.2°C 0.25mm 0.19kPa 24135m 3.6m/s 2.7m/s
20:00
57% 2.4°C 0mm 91% 0cm 1.4° 3.7°C 0mm 0.07kPa 24134m 2.1m/s 2.1m/s
21:00 ☾
66% 1.8°C 0mm 93% 0cm -7.4° 2.8°C 0mm 0.05kPa 24135m 1.6m/s 1.6m/s
22:00 ☾
74% 1.4°C 0mm 94% 0cm -15° 2.4°C 0mm 0.05kPa 24134m 1.5m/s 1.6m/s
23:00 ☾
72% 1.2°C 0mm 94% 0cm -21° 2.1°C 0mm 0.04kPa 24135m 1.5m/s 1.6m/s
Tue, Apr 14 Sunrise 06:22 Sunset 20:12
24:00 ☾
71% 1.1°C 0mm 94% 0cm -26° 1.9°C 0mm 0.04kPa 24135m 1.4m/s 1.5m/s
01:00 ☾
69% 1.2°C 0mm 94% 0cm -28° 2°C 0mm 0.04kPa 24134m 1.5m/s 1.7m/s
02:00 ☾
67% 1.3°C 0mm 83% 0cm -27° 3.9°C 0mm 0.14kPa 24134m 1.9m/s 1.7m/s
03:00 ☾
64% 1.1°C 0mm 72% 0cm -24° 5.8°C 0mm 0.26kPa 24135m 2.3m/s 1.8m/s
04:00 ☾
62% 0.5°C 0mm 61% 0cm -19° 7.6°C 0mm 0.41kPa 24135m 2.7m/s 1.9m/s
05:00 ☾
57% 0.8°C 0mm 57% 0cm -12° 8.8°C 0mm 0.48kPa 24135m 3.6m/s 2.5m/s
06:00 ☾
53% 0.9°C 0mm 54% 0cm -3.6° 9.9°C 0mm 0.57kPa 24135m 4.5m/s 3.1m/s
07:00
48% 1.1°C 0mm 50% 0cm 5.2° 11°C 0mm 0.66kPa 24135m 5.4m/s 3.7m/s
08:00
41% 2°C 0mm 52% 0cm 14° 11°C 0mm 0.64kPa 24135m 5.7m/s 3.9m/s
09:00
35% 2.9°C 0mm 54% 0cm 23° 12°C 0mm 0.63kPa 24135m 6.1m/s 4m/s
10:00
28% 3.8°C 0mm 56% 0cm 31° 12°C 0mm 0.62kPa 24135m 6.5m/s 4.2m/s
11:00
26% 4.9°C 0.003mm 66% 0cm 39° 11°C 0mm 0.44kPa 24135m 5.6m/s 3.6m/s
12:00
25% 5.7°C 0.007mm 76% 0cm 44° 9.8°C 0mm 0.29kPa 24135m 4.7m/s 2.9m/s
13:00
23% 6.3°C 0.01mm 85% 0cm 46° 8.6°C 0mm 0.16kPa 24135m 3.9m/s 2.3m/s
14:00
19% 6°C 0.02mm 85% 0cm 46° 8.5°C 0.02mm 0.17kPa 24135m 3.3m/s 2.3m/s
15:00
15% 5.8°C 0.03mm 84% 0cm 42° 8.3°C 0.04mm 0.17kPa 24135m 2.8m/s 2.2m/s
16:00
11% 5.5°C 0.04mm 84% 0cm 36° 8.1°C 0.06mm 0.18kPa 24135m 2.2m/s 2.2m/s
17:00
9% 5.5°C 0.03mm 84% 0cm 28° 8°C 0.08mm 0.17kPa 24135m 2.6m/s 2.3m/s
18:00
7% 5.5°C 0.03mm 85% 0cm 19° 7.8°C 0.1mm 0.16kPa 24135m 2.9m/s 2.4m/s
19:00
5% 5.5°C 0.02mm 86% 0cm 10° 7.7°C 0.13mm 0.15kPa 24135m 3.2m/s 2.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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