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Rule Fog Hunter

Capel Curig - Fog Hunter - Snowdonia (Eryri)

Capel Curig, Wales, United Kingdom

Thick, moody fog for atmospheric forest and landscape shots

No opportunities right now
Here’s what usually blocks matches

No Fog Hunter opportunities in the next 14 days

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Rule requirements (key thresholds)
Fog Probability · ≥ 60.0%

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Fog Probability 100% failing

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread5.6°C
Visibility24134 (Clear)
Relative Humidity68%
Wind Speed7.9m/s (moderate winds)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

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 95 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 60.0%
Mon, Apr 20
20:000%
21:000%
22:000%
23:000%
Tue, Apr 21
24:000%
01:0021%
02:0037%
03:0037%
04:0037%
05:0050%
06:000%
07:000%
08:000%
09:000%
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11:000%
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17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Apr 22
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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20:000%
21:000%
22:000%
23:000%
Thu, Apr 23
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
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Fri, Apr 24
24:000%
01:000%
02:000%
03:000%
04:000%
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06:000%
07:000%
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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
Tue, Apr 21 Sunrise 06:03 Sunset 20:26
20:00
9% 1.2°C 0mm 68% 0cm 3.1° 6.8°C 0mm 0.32kPa 24134m 15m/s 7.9m/s
21:00 ☾
18% 0.7°C 0mm 70% 0cm -5.3° 5.9°C 0mm 0.28kPa 24134m 15m/s 7.2m/s
22:00 ☾
27% 0.7°C 0mm 73% 0cm -13° 5.2°C 0mm 0.24kPa 24134m 16m/s 6.8m/s
23:00 ☾
36% 0.4°C 0mm 74% 0cm -19° 4.6°C 0mm 0.22kPa 24134m 16m/s 6.5m/s
Wed, Apr 22 Sunrise 06:03 Sunset 20:26
24:00 ☾
46% 0.1°C 0mm 75% 0cm -23° 4°C 0mm 0.2kPa 24135m 17m/s 6.1m/s
01:00 ☾
55% -0.3°C 0mm 76% 0cm -25° 3.6°C 0mm 0.19kPa 24134m 16m/s 5.6m/s
02:00 ☾
67% -0.5°C 0mm 77% 0cm -24° 3.2°C 0mm 0.18kPa 24135m 16m/s 5.1m/s
03:00 ☾
78% -0.7°C 0mm 77% 0cm -21° 2.9°C 0mm 0.17kPa 24134m 16m/s 5.1m/s
04:00 ☾
90% -1°C 0mm 80% 0cm -16° 2°C 0mm 0.14kPa 24135m 13m/s 5.2m/s
05:00 ☾
88% -1.3°C 0mm 80% 0cm -8.9° 1.8°C 0mm 0.14kPa 24134m 11m/s 4.7m/s
06:00 ☾
86% -1.4°C 0mm 80% 0cm -0.69° 1.6°C 0mm 0.13kPa 24135m 10m/s 4.3m/s
07:00
84% -1.1°C 0mm 79% 0cm 7.7° 2.2°C 0mm 0.15kPa 24134m 10m/s 3.7m/s
08:00
77% 0.1°C 0mm 73% 0cm 17° 4.6°C 0mm 0.23kPa 24134m 14m/s 4.3m/s
09:00
70% 1.4°C 0mm 71% 0cm 26° 6.3°C 0mm 0.28kPa 24134m 14m/s 5.6m/s
10:00
63% 2.4°C 0mm 69% 0cm 34° 7.8°C 0mm 0.33kPa 24135m 15m/s 8.2m/s
11:00
62% 2.5°C 0mm 62% 0cm 41° 9.5°C 0mm 0.46kPa 24134m 12m/s 7.8m/s
12:00
60% 2.6°C 0mm 58% 0cm 47° 10°C 0mm 0.53kPa 24134m 12m/s 8.6m/s
13:00
59% 3.4°C 0mm 58% 0cm 49° 11°C 0mm 0.57kPa 24135m 12m/s 8.9m/s
14:00
56% 3.8°C 0mm 57% 0cm 48° 12°C 0mm 0.6kPa 24135m 11m/s 8.8m/s
15:00
53% 4°C 0mm 57% 0cm 44° 12°C 0mm 0.62kPa 24135m 11m/s 8.9m/s
16:00
50% 4.9°C 0mm 59% 0cm 38° 13°C 0mm 0.59kPa 24135m 11m/s 8.4m/s
17:00
43% 6.1°C 0mm 66% 0cm 30° 12°C 0mm 0.49kPa 24135m 11m/s 6.8m/s
18:00
36% 6.1°C 0mm 70% 0cm 21° 11°C 0mm 0.41kPa 24134m 11m/s 6.6m/s
19:00
29% 5.9°C 0mm 74% 0cm 12° 10°C 0mm 0.33kPa 24134m 11m/s 6.5m/s
20:00
23% 5.3°C 0mm 79% 0cm 3.4° 8.8°C 0mm 0.24kPa 24134m 12m/s 5.4m/s
21:00 ☾
16% 4°C 0mm 81% 0cm -5.1° 7°C 0mm 0.19kPa 24134m 9.5m/s 4.2m/s
22:00 ☾
10% 2.9°C 0mm 79% 0cm -12° 6.3°C 0mm 0.2kPa 24135m 9.4m/s 4.1m/s
23:00 ☾
8% 2.2°C 0mm 78% 0cm -18° 5.8°C 0mm 0.21kPa 24135m 7.6m/s 3.8m/s
Thu, Apr 23 Sunrise 06:01 Sunset 20:27
24:00 ☾
7% 1.6°C 0mm 79% 0cm -23° 5°C 0mm 0.18kPa 24135m 4.6m/s 3.2m/s
01:00 ☾
5% 1.1°C 0mm 81% 0cm -24° 4.1°C 0mm 0.15kPa 24134m 3m/s 3m/s
02:00 ☾
10% 0.6°C 0mm 83% 0cm -24° 3.2°C 0mm 0.13kPa 24135m 2.5m/s 2.9m/s
03:00 ☾
14% 0.1°C 0mm 84% 0cm -21° 2.5°C 0mm 0.12kPa 24135m 2.5m/s 2.9m/s
04:00 ☾
19% -0.2°C 0mm 84% 0cm -15° 2.2°C 0mm 0.11kPa 24135m 2.5m/s 3m/s
05:00 ☾
18% -0.5°C 0mm 84% 0cm -8.6° 1.9°C 0mm 0.11kPa 24135m 2.5m/s 3m/s
06:00
17% -0.7°C 0mm 84% 0cm -0.25° 1.7°C 0mm 0.11kPa 24135m 2.4m/s 2.9m/s
07:00
16% 0°C 0mm 82% 0cm 8° 2.8°C 0mm 0.14kPa 24135m 2.8m/s 2.8m/s
08:00
24% 1.4°C 0mm 75% 0cm 17° 5.4°C 0mm 0.22kPa 24135m 3m/s 2.6m/s
09:00
33% 2°C 0mm 67% 0cm 26° 7.7°C 0mm 0.34kPa 24134m 3.7m/s 2.7m/s
10:00
41% 2.5°C 0mm 61% 0cm 34° 9.7°C 0mm 0.47kPa 24135m 4.6m/s 2.7m/s
11:00
39% 2.9°C 0mm 55% 0cm 42° 11°C 0mm 0.6kPa 24135m 5.4m/s 2.9m/s
12:00
36% 3.2°C 0mm 52% 0cm 47° 13°C 0mm 0.71kPa 24135m 5.7m/s 3.1m/s
13:00
34% 3.7°C 0mm 50% 0cm 49° 14°C 0mm 0.78kPa 24134m 5.8m/s 3.4m/s
14:00
39% 4°C 0mm 50% 0cm 49° 14°C 0mm 0.81kPa 24135m 5.8m/s 4.2m/s
15:00
43% 4.4°C 0mm 50% 0cm 44° 15°C 0mm 0.82kPa 24135m 5.9m/s 4.7m/s
16:00
48% 4.6°C 0mm 51% 0cm 38° 15°C 0mm 0.81kPa 24134m 5.7m/s 4.4m/s
17:00
50% 5°C 0mm 53% 0cm 30° 14°C 0mm 0.76kPa 24135m 5.3m/s 4.2m/s
18:00
53% 6.3°C 0mm 60% 0cm 21° 14°C 0mm 0.62kPa 24134m 5.1m/s 3.7m/s
19:00
55% 7.1°C 0mm 69% 0cm 12° 13°C 0mm 0.44kPa 24134m 4.9m/s 2.9m/s
20:00
60% 5.8°C 0mm 77% 0cm 3.6° 9.6°C 0mm 0.27kPa 24134m 2.2m/s 2.5m/s
21:00 ☾
64% 5.1°C 0mm 83% 0cm -4.8° 7.9°C 0mm 0.18kPa 24134m 2.4m/s 2.6m/s
22:00 ☾
69% 4.7°C 0mm 85% 0cm -12° 7.1°C 0mm 0.15kPa 24134m 2.3m/s 2.7m/s
23:00 ☾
71% 4.1°C 0mm 85% 0cm -18° 6.4°C 0mm 0.14kPa 24135m 2.3m/s 2.7m/s
Fri, Apr 24 Sunrise 05:59 Sunset 20:29
24:00 ☾
72% 3.2°C 0mm 84% 0cm -22° 5.6°C 0mm 0.15kPa 24135m 2.3m/s 2.6m/s
01:00 ☾
74% 2.3°C 0mm 82% 0cm -24° 5.1°C 0mm 0.16kPa 24135m 2.3m/s 2.6m/s
02:00 ☾
76% 1.9°C 0mm 69% 0cm -23° 7.2°C 0mm 0.32kPa 24135m 2.3m/s 2.4m/s
03:00 ☾
77% 0.9°C 0mm 56% 0cm -20° 9.4°C 0mm 0.52kPa 24135m 2.2m/s 2.2m/s
04:00 ☾
79% -0.9°C 0mm 42% 0cm -15° 11°C 0mm 0.78kPa 24135m 2.2m/s 2m/s
05:00 ☾
79% -0.5°C 0mm 40% 0cm -8.3° 13°C 0mm 0.88kPa 24135m 2.2m/s 1.9m/s
06:00
79% 0°C 0mm 38% 0cm 0.13° 14°C 0mm 0.98kPa 24135m 2.2m/s 1.8m/s
07:00
79% 0.3°C 0mm 36% 0cm 8.3° 15°C 0mm 1.1kPa 24135m 2.1m/s 1.6m/s
08:00
75% 0.7°C 0mm 37% 0cm 17° 15°C 0mm 1.1kPa 24135m 2.2m/s 1.7m/s
09:00
72% 1.1°C 0mm 37% 0cm 26° 16°C 0mm 1.1kPa 24135m 2.2m/s 1.7m/s
10:00
68% 1.4°C 0mm 37% 0cm 35° 16°C 0mm 1.1kPa 24135m 2.3m/s 1.8m/s
11:00
67% 3.6°C 0mm 45% 0cm 42° 15°C 0mm 0.95kPa 24135m 1.8m/s 1.5m/s
12:00
65% 5.3°C 0mm 54% 0cm 47° 15°C 0mm 0.76kPa 24135m 1.4m/s 1.2m/s
13:00
64% 6.6°C 0mm 62% 0cm 50° 14°C 0mm 0.6kPa 24135m 0.94m/s 0.86m/s
14:00
61% 5.5°C 0mm 66% 0cm 49° 12°C 0mm 0.47kPa 24135m 0.97m/s 0.92m/s
15:00
58% 4.3°C 0mm 70% 0cm 45° 9.6°C 0mm 0.36kPa 24135m 0.99m/s 0.99m/s
16:00
55% 3.1°C 0mm 73% 0cm 38° 7.5°C 0mm 0.28kPa 24135m 1m/s 1.1m/s
17:00
54% 2.6°C 0mm 73% 0cm 30° 7.1°C 0mm 0.27kPa 24135m 0.98m/s 1m/s
18:00
53% 2.1°C 0mm 73% 0cm 21° 6.7°C 0mm 0.27kPa 24135m 0.94m/s 1m/s
19:00
52% 1.7°C 0mm 73% 0cm 13° 6.2°C 0mm 0.26kPa 24135m 0.9m/s 1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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