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Rule Fog Hunter

Llyn Ogwen - Fog Hunter - Snowdonia (Eryri)

Bethesda, 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 Spread5.1°C
Visibility24135 (Clear)
Relative Humidity70%
Wind Speed1.8m/s (calm conditions)

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%
Sun, Apr 19
09:000%
10:000%
11:000%
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Mon, Apr 20
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Tue, Apr 21
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Wed, Apr 22
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Thu, Apr 23
24:000%
01:000%
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06:000%
07:000%
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
Mon, Apr 20 Sunrise 06:06 Sunset 20:25
09:00
100% 2.7°C 0mm 70% 0cm 25° 7.8°C 0mm 0.31kPa 24135m 2m/s 1.8m/s
10:00
100% 3.3°C 0mm 69% 0cm 33° 8.6°C 0mm 0.35kPa 24134m 2.4m/s 1.8m/s
11:00
96% 3.4°C 0mm 67% 0cm 40° 9.1°C 0mm 0.38kPa 24134m 2.9m/s 2.3m/s
12:00
92% 4°C 0mm 68% 0cm 46° 9.7°C 0.06mm 0.39kPa 22943m 2.9m/s 3.1m/s
13:00
88% 4.8°C 0.01mm 72% 0cm 48° 9.6°C 0.06mm 0.33kPa 24134m 4.1m/s 3.3m/s
14:00
59% 4.6°C 0mm 72% 0cm 48° 9.5°C 0.06mm 0.34kPa 24135m 4.3m/s 2.8m/s
15:00
29% 4.5°C 0mm 71% 0cm 44° 9.5°C 0.06mm 0.35kPa 24135m 3.3m/s 2.4m/s
16:00
0% 4.7°C 0mm 72% 0cm 37° 9.6°C 0.06mm 0.34kPa 24076m 2.4m/s 1.5m/s
17:00
0% 4.9°C 0mm 72% 0cm 29° 9.7°C 0.13mm 0.33kPa 24017m 0.81m/s 0.08m/s
18:00
0% 4.9°C 0mm 72% 0cm 21° 9.6°C 0.25mm 0.33kPa 23957m 2.3m/s 2.2m/s
19:00
0% 5.4°C 0mm 77% 0cm 12° 9.2°C 0.31mm 0.26kPa 24134m 2m/s 1.8m/s
20:00
2% 5°C 0mm 77% 0cm 3° 8.8°C 0.13mm 0.26kPa 23932m 1.5m/s 1.3m/s
21:00 ☾
4% 4.8°C 0mm 79% 0cm -5.5° 8.2°C 0.25mm 0.22kPa 24134m 3.8m/s 3m/s
22:00 ☾
6% 4.2°C 0mm 80% 0cm -13° 7.4°C 0.25mm 0.21kPa 24134m 6.3m/s 3.6m/s
23:00 ☾
10% 3.6°C 0mm 80% 0cm -19° 6.8°C 0.25mm 0.2kPa 24135m 9.6m/s 3.9m/s
Tue, Apr 21 Sunrise 06:06 Sunset 20:25
24:00 ☾
14% 3.5°C 0mm 84% 0cm -23° 6°C 0.25mm 0.15kPa 24135m 8.6m/s 3.9m/s
01:00 ☾
18% 3.3°C 0mm 85% 0cm -25° 5.7°C 0.25mm 0.14kPa 24134m 7.9m/s 3.9m/s
02:00 ☾
38% 2.8°C 0mm 82% 0cm -24° 5.7°C 0mm 0.17kPa 24135m 7.5m/s 4m/s
03:00 ☾
59% 2.5°C 0mm 83% 0cm -21° 5.1°C 0mm 0.15kPa 24134m 7.6m/s 4.2m/s
04:00 ☾
79% 2.5°C 0mm 86% 0cm -16° 4.6°C 0mm 0.11kPa 24134m 8.4m/s 4.5m/s
05:00 ☾
69% 3°C 0.01mm 90% 0cm -9.3° 4.4°C 0mm 0.08kPa 24135m 8.7m/s 4.5m/s
06:00 ☾
59% 2.2°C 0mm 79% 0cm -1.1° 5.5°C 0mm 0.19kPa 24135m 9.6m/s 6.2m/s
07:00
49% 2.5°C 0.02mm 81% 0cm 7.4° 5.5°C 0mm 0.17kPa 24135m 9.6m/s 5.2m/s
08:00
40% 3.4°C 0mm 85% 0cm 16° 5.7°C 0mm 0.14kPa 24134m 10m/s 5.4m/s
09:00
31% 3.7°C 0mm 84% 0cm 25° 6.2°C 0mm 0.15kPa 24134m 10m/s 6.4m/s
10:00
22% 2.6°C 0mm 73% 0cm 34° 7.1°C 0mm 0.27kPa 24135m 10m/s 6.8m/s
11:00
23% 2.3°C 0mm 67% 0cm 41° 8.1°C 0mm 0.36kPa 24134m 10m/s 7.9m/s
12:00
23% 1.7°C 0mm 60% 0cm 46° 9°C 0mm 0.45kPa 24134m 11m/s 8m/s
13:00
24% 2.1°C 0mm 59% 0cm 49° 9.7°C 0mm 0.49kPa 24134m 12m/s 7.9m/s
14:00
25% 2.4°C 0mm 58% 0cm 48° 10°C 0mm 0.53kPa 24134m 12m/s 8.4m/s
15:00
26% 2.4°C 0mm 56% 0cm 44° 11°C 0mm 0.58kPa 24134m 13m/s 8.7m/s
16:00
27% 2.6°C 0mm 56% 0cm 37° 11°C 0mm 0.57kPa 24134m 12m/s 7.7m/s
17:00
30% 2.8°C 0mm 57% 0cm 30° 11°C 0mm 0.56kPa 24134m 13m/s 8m/s
18:00
33% 2.4°C 0mm 57% 0cm 21° 10°C 0mm 0.54kPa 24134m 13m/s 8m/s
19:00
36% 2°C 0mm 59% 0cm 12° 9.5°C 0mm 0.48kPa 24134m 14m/s 8.5m/s
20:00
45% 1.9°C 0mm 62% 0cm 3.2° 8.7°C 0mm 0.42kPa 24134m 14m/s 8.2m/s
21:00 ☾
55% 1.7°C 0mm 66% 0cm -5.2° 7.7°C 0mm 0.36kPa 24135m 15m/s 7.8m/s
22:00 ☾
64% 1.5°C 0mm 69% 0cm -13° 6.9°C 0mm 0.31kPa 24135m 15m/s 7.9m/s
23:00 ☾
66% 1°C 0mm 69% 0cm -19° 6.2°C 0mm 0.29kPa 24134m 16m/s 7.6m/s
Wed, Apr 22 Sunrise 06:04 Sunset 20:26
24:00 ☾
69% 0°C 0mm 67% 0cm -23° 5.7°C 0mm 0.3kPa 24135m 16m/s 7.1m/s
01:00 ☾
71% -0.5°C 0mm 66% 0cm -25° 5.3°C 0mm 0.3kPa 24135m 16m/s 6.7m/s
02:00 ☾
71% -0.6°C 0mm 68% 0cm -24° 4.8°C 0mm 0.28kPa 24134m 15m/s 6.2m/s
03:00 ☾
72% -0.5°C 0mm 70% 0cm -21° 4.4°C 0mm 0.25kPa 24135m 13m/s 5.6m/s
04:00 ☾
72% -0.2°C 0mm 73% 0cm -16° 4.2°C 0mm 0.22kPa 24134m 12m/s 5.2m/s
05:00 ☾
72% 0.2°C 0mm 76% 0cm -8.9° 4.1°C 0mm 0.2kPa 24134m 12m/s 5.1m/s
06:00 ☾
73% 0.7°C 0mm 80% 0cm -0.76° 3.9°C 0mm 0.16kPa 24135m 10m/s 4.7m/s
07:00
73% 1.3°C 0mm 82% 0cm 7.7° 4.1°C 0mm 0.15kPa 24134m 10m/s 4.7m/s
08:00
72% 2.2°C 0mm 80% 0cm 17° 5.5°C 0mm 0.18kPa 24134m 12m/s 5.3m/s
09:00
71% 2.7°C 0mm 76% 0cm 25° 6.6°C 0mm 0.23kPa 24134m 12m/s 6m/s
10:00
70% 3.4°C 0mm 72% 0cm 34° 8.1°C 0mm 0.3kPa 24134m 11m/s 6.7m/s
11:00
69% 3.4°C 0mm 66% 0cm 41° 9.4°C 0mm 0.4kPa 24135m 11m/s 6.8m/s
12:00
69% 3.5°C 0mm 63% 0cm 46° 10°C 0mm 0.46kPa 24135m 11m/s 7.5m/s
13:00
68% 3.7°C 0mm 62% 0cm 49° 11°C 0mm 0.5kPa 24134m 11m/s 7.3m/s
14:00
68% 4.2°C 0mm 61% 0cm 48° 11°C 0mm 0.52kPa 24135m 11m/s 7.2m/s
15:00
67% 4.4°C 0mm 61% 0cm 44° 12°C 0mm 0.54kPa 24135m 11m/s 6.9m/s
16:00
67% 4.5°C 0mm 60% 0cm 38° 12°C 0mm 0.57kPa 24134m 11m/s 7m/s
17:00
66% 4.7°C 0mm 61% 0cm 30° 12°C 0mm 0.55kPa 24134m 11m/s 6.9m/s
18:00
65% 5°C 0mm 63% 0cm 21° 12°C 0mm 0.51kPa 24135m 11m/s 6.5m/s
19:00
64% 4.6°C 0mm 65% 0cm 12° 11°C 0mm 0.47kPa 24135m 11m/s 6.7m/s
20:00
65% 3°C 0mm 71% 0cm 3.5° 7.9°C 0mm 0.31kPa 24135m 8m/s 5.3m/s
21:00 ☾
66% 1.2°C 0mm 78% 0cm -5° 4.8°C 0mm 0.19kPa 24135m 5.1m/s 3.9m/s
22:00 ☾
67% -0.7°C 0mm 84% 0cm -12° 1.7°C 0mm 0.11kPa 24135m 2.1m/s 2.5m/s
23:00 ☾
67% -0.7°C 0mm 83% 0cm -18° 1.9°C 0mm 0.12kPa 24135m 2.3m/s 2.6m/s
Thu, Apr 23 Sunrise 06:01 Sunset 20:28
24:00 ☾
68% -0.8°C 0mm 81% 0cm -22° 2.1°C 0mm 0.13kPa 24135m 2.5m/s 2.6m/s
01:00 ☾
68% -0.8°C 0mm 80% 0cm -24° 2.3°C 0mm 0.14kPa 24135m 2.6m/s 2.7m/s
02:00 ☾
70% -0.1°C 0mm 72% 0cm -24° 4.6°C 0mm 0.24kPa 24135m 2.8m/s 2.7m/s
03:00 ☾
71% 0.5°C 0mm 64% 0cm -21° 6.9°C 0mm 0.36kPa 24135m 3m/s 2.6m/s
04:00 ☾
73% 0.8°C 0mm 56% 0cm -15° 9.2°C 0mm 0.52kPa 24135m 3.2m/s 2.6m/s
05:00 ☾
74% 1.1°C 0mm 52% 0cm -8.6° 11°C 0mm 0.62kPa 24135m 3.4m/s 2.6m/s
06:00
76% 1.4°C 0mm 48% 0cm -0.33° 12°C 0mm 0.74kPa 24135m 3.6m/s 2.6m/s
07:00
77% 1.6°C 0mm 44% 0cm 8° 14°C 0mm 0.87kPa 24135m 3.7m/s 2.6m/s
08:00
80% 2.4°C 0mm 46% 0cm 17° 14°C 0mm 0.87kPa 24135m 3.9m/s 2.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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