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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 · ≥ 75.0%

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 Spread3.8°C
Visibility24135 (Clear)
Relative Humidity79%
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
≥ 75.0%
Tue, Jul 7
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, Jul 8
24:000%
01:000%
02:000%
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23:000%
Thu, Jul 9
24:000%
01:000%
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06:000%
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08:000%
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Fri, Jul 10
24:000%
01:000%
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Sat, Jul 11
24:000%
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05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
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
Wed, Jul 8 Sunrise 05:00 Sunset 21:41
15:00
100% 15°C 0mm 79% 0cm 54° 19°C 0mm 0.47kPa 24135m 2.2m/s 1.8m/s
16:00
100% 15°C 0mm 78% 0cm 47° 19°C 0mm 0.48kPa 24135m 1.9m/s 1.4m/s
17:00
100% 15°C 0mm 78% 0cm 39° 19°C 0mm 0.48kPa 24135m 1.8m/s 1.3m/s
18:00
99% 15°C 0mm 80% 0cm 30° 19°C 0mm 0.42kPa 24135m 1.4m/s 1.2m/s
19:00
99% 15°C 0mm 83% 0cm 21° 18°C 0mm 0.35kPa 24134m 0.91m/s 0.71m/s
20:00
97% 16°C 0mm 88% 0cm 12° 18°C 0mm 0.25kPa 24134m 0.6m/s 0.39m/s
21:00
95% 15°C 0mm 88% 0cm 4.4° 17°C 0mm 0.23kPa 24134m 0.73m/s 0.76m/s
22:00 ☾
93% 14°C 0mm 87% 0cm -2.7° 17°C 0mm 0.24kPa 24135m 1.1m/s 1.2m/s
23:00 ☾
95% 14°C 0mm 85% 0cm -8.4° 16°C 0mm 0.28kPa 24134m 1.5m/s 1.5m/s
Thu, Jul 9 Sunrise 05:00 Sunset 21:41
24:00 ☾
97% 13°C 0mm 82% 0cm -12° 16°C 0mm 0.33kPa 24134m 2.1m/s 2.2m/s
01:00 ☾
99% 12°C 0mm 81% 0cm -14° 16°C 0mm 0.33kPa 24135m 2.1m/s 2.1m/s
02:00 ☾
99% 12°C 0mm 80% 0cm -14° 15°C 0mm 0.35kPa 24135m 2.1m/s 2.2m/s
03:00 ☾
100% 12°C 0mm 80% 0cm -11° 15°C 0mm 0.35kPa 24135m 2.1m/s 2m/s
04:00 ☾
100% 12°C 0mm 80% 0cm -7° 15°C 0mm 0.35kPa 24134m 2m/s 2m/s
05:00 ☾
100% 12°C 0mm 80% 0cm -0.58° 15°C 0mm 0.34kPa 24134m 2m/s 2m/s
06:00
100% 12°C 0mm 80% 0cm 6.5° 15°C 0mm 0.34kPa 24134m 2m/s 2m/s
07:00
100% 13°C 0mm 83% 0cm 15° 16°C 0mm 0.31kPa 24135m 2m/s 1.9m/s
08:00
100% 14°C 0mm 85% 0cm 23° 16°C 0mm 0.27kPa 24135m 2.3m/s 2m/s
09:00
100% 14°C 0mm 85% 0cm 32° 17°C 0mm 0.29kPa 24134m 2.2m/s 1.9m/s
10:00
100% 15°C 0mm 84% 0cm 41° 18°C 0mm 0.32kPa 24135m 2.7m/s 2.5m/s
11:00
100% 15°C 0mm 82% 0cm 49° 18°C 0mm 0.36kPa 24134m 2.6m/s 2.4m/s
12:00
100% 15°C 0mm 81% 0cm 55° 18°C 0mm 0.4kPa 24135m 2.5m/s 2.4m/s
13:00
100% 15°C 0mm 79% 0cm 59° 18°C 0mm 0.44kPa 24135m 3.2m/s 2.8m/s
14:00
100% 15°C 0mm 79% 0cm 58° 18°C 0mm 0.45kPa 24134m 3.3m/s 2.7m/s
15:00
100% 15°C 0mm 82% 0cm 54° 18°C 0mm 0.37kPa 24135m 3.1m/s 2.7m/s
16:00
100% 15°C 0mm 84% 0cm 47° 17°C 0mm 0.31kPa 24135m 2.9m/s 2.4m/s
17:00
99% 15°C 0mm 87% 0cm 39° 17°C 0mm 0.25kPa 24134m 2.6m/s 2.1m/s
18:00
97% 14°C 0mm 90% 0cm 30° 16°C 0mm 0.17kPa 13265m 2m/s 1.5m/s
19:00
96% 14°C 0mm 93% 0cm 21° 15°C 0mm 0.12kPa 398m 1m/s 0.6m/s
20:00
95% 14°C 0mm 92% 0cm 12° 15°C 0mm 0.13kPa 24134m 0.72m/s 0.74m/s
21:00
93% 14°C 0mm 88% 0cm 4.3° 16°C 0mm 0.21kPa 24135m 0.81m/s 0.65m/s
22:00 ☾
92% 13°C 0mm 85% 0cm -2.8° 16°C 0mm 0.26kPa 24135m 0.8m/s 0.77m/s
23:00 ☾
91% 13°C 0mm 84% 0cm -8.5° 16°C 0mm 0.29kPa 24135m 0.61m/s 0.63m/s
Fri, Jul 10 Sunrise 05:01 Sunset 21:41
24:00 ☾
91% 13°C 0mm 83% 0cm -12° 15°C 0mm 0.3kPa 24135m 0.5m/s 0.42m/s
01:00 ☾
90% 12°C 0mm 80% 0cm -14° 16°C 0mm 0.35kPa 24135m 1.8m/s 1.8m/s
02:00 ☾
89% 12°C 0mm 79% 0cm -14° 16°C 0mm 0.37kPa 24135m 2.1m/s 2.2m/s
03:00 ☾
88% 12°C 0mm 80% 0cm -12° 15°C 0mm 0.35kPa 24135m 2.1m/s 2.1m/s
04:00 ☾
87% 12°C 0mm 80% 0cm -7.1° 15°C 0mm 0.35kPa 24134m 2m/s 2.1m/s
05:00 ☾
84% 12°C 0mm 80% 0cm -0.74° 15°C 0mm 0.35kPa 24135m 1.8m/s 1.9m/s
06:00
81% 12°C 0mm 80% 0cm 6.4° 16°C 0mm 0.36kPa 24134m 1.7m/s 1.8m/s
07:00
78% 13°C 0mm 80% 0cm 15° 16°C 0mm 0.36kPa 24135m 1.7m/s 1.7m/s
08:00
57% 13°C 0mm 80% 0cm 23° 17°C 0mm 0.38kPa 24134m 1.8m/s 1.8m/s
09:00
37% 14°C 0mm 85% 0cm 32° 16°C 0mm 0.28kPa 24134m 1.9m/s 1.9m/s
10:00
16% 14°C 0mm 84% 0cm 41° 17°C 0mm 0.31kPa 24135m 1.7m/s 1.5m/s
11:00
14% 14°C 0mm 80% 0cm 49° 17°C 0mm 0.4kPa 23039m 1.7m/s 1.9m/s
12:00
12% 14°C 0mm 84% 0cm 55° 17°C 0mm 0.31kPa 23004m 1.9m/s 2.3m/s
13:00
10% 15°C 0mm 88% 0cm 59° 17°C 0mm 0.22kPa 107m 2.4m/s 2.7m/s
14:00
20% 15°C 0mm 91% 0cm 58° 16°C 0mm 0.18kPa 109m 2.2m/s 2.3m/s
15:00
30% 15°C 0mm 92% 0cm 54° 16°C 0mm 0.15kPa 127m 1.8m/s 1.7m/s
16:00
40% 15°C 0mm 91% 0cm 47° 16°C 0mm 0.16kPa 120m 1.6m/s 1.2m/s
17:00
39% 15°C 0mm 92% 0cm 39° 16°C 0mm 0.15kPa 125m 1.9m/s 1.4m/s
18:00
38% 15°C 0mm 92% 0cm 30° 16°C 0mm 0.15kPa 189m 2m/s 1.4m/s
19:00
37% 15°C 0mm 92% 0cm 21° 16°C 0mm 0.14kPa 434m 1.4m/s 0.85m/s
20:00
36% 15°C 0mm 92% 0cm 12° 16°C 0.08mm 0.14kPa 8334m 1.7m/s 1.5m/s
21:00
36% 14°C 0mm 92% 0cm 4.3° 16°C 0.17mm 0.14kPa 16234m 2.1m/s 2.1m/s
22:00 ☾
35% 14°C 0mm 92% 0cm -2.9° 15°C 0.25mm 0.14kPa 24135m 2.4m/s 2.7m/s
23:00 ☾
33% 14°C 0mm 91% 0cm -8.6° 16°C 0.29mm 0.16kPa 24135m 2.4m/s 2.6m/s
Sat, Jul 11 Sunrise 05:02 Sunset 21:40
24:00 ☾
31% 15°C 0mm 90% 0cm -13° 16°C 0.33mm 0.18kPa 24135m 2.4m/s 2.4m/s
01:00 ☾
29% 15°C 0mm 90% 0cm -15° 17°C 0.38mm 0.2kPa 24135m 2.3m/s 2.3m/s
02:00 ☾
34% 15°C 0mm 85% 0cm -14° 18°C 0.27mm 0.31kPa 24135m 2.4m/s 2.2m/s
03:00 ☾
40% 16°C 0mm 80% 0cm -12° 19°C 0.17mm 0.45kPa 24135m 2.5m/s 2.2m/s
04:00 ☾
45% 16°C 0mm 75% 0cm -7.2° 21°C 0.06mm 0.61kPa 24135m 2.6m/s 2.1m/s
05:00 ☾
44% 16°C 0mm 70% 0cm -0.9° 22°C 0.06mm 0.77kPa 24135m 3.1m/s 2.5m/s
06:00
42% 16°C 0mm 66% 0cm 6.3° 23°C 0.06mm 0.95kPa 24135m 3.6m/s 2.8m/s
07:00
41% 16°C 0mm 62% 0cm 14° 24°C 0.06mm 1.1kPa 24135m 4.1m/s 3.2m/s
08:00
41% 16°C 0mm 61% 0cm 23° 24°C 0.13mm 1.2kPa 24135m 4.3m/s 3.3m/s
09:00
41% 17°C 0mm 61% 0cm 32° 25°C 0.19mm 1.2kPa 24135m 4.4m/s 3.5m/s
10:00
41% 17°C 0mm 61% 0cm 41° 25°C 0.25mm 1.2kPa 24135m 4.5m/s 3.6m/s
11:00
41% 17°C 0.02mm 69% 0cm 49° 23°C 0.54mm 0.89kPa 24135m 5.1m/s 3.9m/s
12:00
42% 17°C 0.04mm 77% 0cm 55° 21°C 0.83mm 0.59kPa 24135m 5.6m/s 4.3m/s
13:00
42% 17°C 0.06mm 85% 0cm 59° 20°C 1.1mm 0.35kPa 24135m 6.1m/s 4.6m/s
14:00
43% 17°C 0.04mm 87% 0cm 58° 19°C 0.9mm 0.28kPa 24135m 6m/s 4.3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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