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Rule Fog Hunter

Fog Hunter Forecast for Pen yr Ole Wen, Snowdonia (Eryri)

Bethesda, Wales, United Kingdom

A steep mountain ridge rises above Cwm Lloer and the Ogwen Valley, revealing broad views toward Tryfan and the Glyderau.

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread5.0°C
Visibility24135 (Clear)
Relative Humidity72%
Wind Speed2.5m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London

No opportunities in the next 14 days

See which requirements block the most forecast hours below.

Most common blockers (85-hour forecast)

  • Fog Probability100% of hours

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Fog Hunter conditions across Snowdonia (Eryri). The requirements and hourly values below show how those signals apply at Pen yr Ole Wen.

Explore Fog Hunter conditions across Snowdonia (Eryri) →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Pen yr Ole Wen during the last 365 days.

Last 30 days
0
recorded matching windows
Last 90 days
7
recorded matching windows · 84% average confidence
Last 365 days
8
recorded matching windows · 86% average confidence

Only 8 completed matches are recorded in the last 365 days—insufficient history to identify a reliable typical start time or month.

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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85-hour requirements breakdown

When available, the detailed table below covers only the stated 85-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

What passed or failed, hour by hour
0matching hours in the next 85 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/London
Fog Probability
≥ 75.0%
Sat, Aug 22
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Sun, Aug 23
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Mon, Aug 24
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Tue, Aug 25
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
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, Aug 22 Sunrise 06:08 Sunset 20:27
21:00 ☾
87% 8.3°C 0mm 72% 0cm -5.1° 13°C 0mm 0.43kPa 24135m 3.2m/s 2.5m/s
22:00 ☾
99% 8.1°C 0mm 71% 0cm -13° 13°C 0mm 0.44kPa 24135m 3.6m/s 2.5m/s
23:00 ☾
99% 8°C 0mm 72% 0cm -19° 13°C 0mm 0.41kPa 24134m 3.9m/s 2.8m/s
Sun, Aug 23 Sunrise 06:08 Sunset 20:27
24:00 ☾
98% 7.7°C 0mm 73% 0cm -23° 12°C 0mm 0.39kPa 24134m 3.1m/s 2.2m/s
01:00 ☾
98% 7.7°C 0mm 74% 0cm -25° 12°C 0mm 0.37kPa 24134m 2.8m/s 1.8m/s
02:00 ☾
79% 8.1°C 0mm 77% 0cm -25° 12°C 0mm 0.33kPa 24134m 2.1m/s 1.5m/s
03:00 ☾
61% 8.4°C 0mm 79% 0cm -22° 12°C 0mm 0.29kPa 24134m 2.3m/s 1.6m/s
04:00 ☾
42% 8.6°C 0mm 80% 0cm -17° 12°C 0mm 0.28kPa 24134m 1.6m/s 1.2m/s
05:00 ☾
34% 8.7°C 0mm 81% 0cm -10° 12°C 0mm 0.26kPa 24134m 1.3m/s 1.1m/s
06:00 ☾
27% 8.7°C 0mm 82% 0cm -2.1° 12°C 0mm 0.24kPa 24135m 1.1m/s 1.3m/s
07:00
19% 8.8°C 0mm 83% 0cm 6.5° 12°C 0mm 0.23kPa 24135m 1m/s 1.2m/s
08:00
15% 9.5°C 0mm 83% 0cm 15° 12°C 0mm 0.25kPa 24135m 0.8m/s 0.95m/s
09:00
12% 9.7°C 0mm 81% 0cm 24° 13°C 0mm 0.29kPa 24134m 0.93m/s 0.82m/s
10:00
8% 9.7°C 0mm 78% 0cm 33° 13°C 0mm 0.34kPa 24134m 1.1m/s 1.1m/s
11:00
8% 9.6°C 0mm 76% 0cm 40° 14°C 0mm 0.38kPa 24134m 1.1m/s 1.4m/s
12:00
8% 9.7°C 0mm 76% 0cm 45° 14°C 0mm 0.38kPa 24135m 0.93m/s 1.6m/s
13:00
8% 9.8°C 0mm 76% 0cm 48° 14°C 0mm 0.38kPa 24135m 1.3m/s 2.5m/s
14:00
30% 9.8°C 0mm 74% 0cm 47° 14°C 0mm 0.43kPa 24135m 1.5m/s 3.1m/s
15:00
53% 9.9°C 0mm 73% 0cm 44° 15°C 0mm 0.45kPa 24134m 1.8m/s 3.5m/s
16:00
75% 10°C 0mm 74% 0cm 37° 15°C 0mm 0.43kPa 24135m 2.5m/s 3.7m/s
17:00
80% 9.9°C 0mm 74% 0cm 29° 15°C 0mm 0.44kPa 24135m 2.5m/s 3.4m/s
18:00
84% 9.8°C 0mm 73% 0cm 21° 15°C 0mm 0.45kPa 24134m 2.6m/s 2.7m/s
19:00
89% 9.7°C 0mm 73% 0cm 12° 15°C 0mm 0.45kPa 24135m 2.1m/s 2m/s
20:00
91% 9.8°C 0mm 76% 0cm 3.1° 14°C 0mm 0.39kPa 24134m 2.2m/s 1.9m/s
21:00 ☾
92% 9.7°C 0mm 77% 0cm -5.5° 14°C 0mm 0.36kPa 24134m 2.7m/s 2.3m/s
22:00 ☾
94% 9.4°C 0mm 78% 0cm -13° 13°C 0mm 0.34kPa 24134m 2.7m/s 2.7m/s
23:00 ☾
94% 8.8°C 0mm 76% 0cm -19° 13°C 0mm 0.36kPa 24134m 3.1m/s 3m/s
Mon, Aug 24 Sunrise 06:10 Sunset 20:25
24:00 ☾
94% 8.1°C 0mm 70% 0cm -24° 13°C 0mm 0.45kPa 24134m 3.2m/s 3.1m/s
01:00 ☾
94% 7.5°C 0mm 67% 0cm -26° 14°C 0mm 0.52kPa 24134m 3.2m/s 3.1m/s
02:00 ☾
91% 7.5°C 0mm 67% 0cm -25° 13°C 0mm 0.51kPa 24134m 4.3m/s 3.9m/s
03:00 ☾
89% 7.6°C 0mm 67% 0cm -22° 13°C 0mm 0.5kPa 24134m 4.6m/s 4.3m/s
04:00 ☾
86% 7.9°C 0mm 69% 0cm -17° 13°C 0mm 0.48kPa 24135m 4.7m/s 4.3m/s
05:00 ☾
83% 7.6°C 0mm 66% 0cm -10° 14°C 0mm 0.52kPa 24134m 4.2m/s 3.9m/s
06:00 ☾
81% 7.2°C 0mm 64% 0cm -2.4° 14°C 0mm 0.56kPa 24134m 3.6m/s 3.3m/s
07:00
78% 7.2°C 0mm 64% 0cm 6.2° 14°C 0mm 0.58kPa 24134m 3.5m/s 3.3m/s
08:00
73% 8.4°C 0mm 64% 0cm 15° 15°C 0mm 0.62kPa 24134m 3.5m/s 3.2m/s
09:00
67% 9.2°C 0mm 62% 0cm 24° 17°C 0mm 0.72kPa 24135m 2.5m/s 2.2m/s
10:00
62% 10°C 0mm 60% 0cm 32° 18°C 0mm 0.81kPa 24135m 2.6m/s 2m/s
11:00
59% 10°C 0mm 58% 0cm 40° 19°C 0mm 0.91kPa 24134m 3.1m/s 2.4m/s
12:00
56% 9.9°C 0mm 54% 0cm 45° 19°C 0mm 1kPa 24134m 5.3m/s 4.1m/s
13:00
53% 9.9°C 0mm 55% 0cm 48° 19°C 0mm 1kPa 24134m 6.4m/s 5.2m/s
14:00
44% 10°C 0mm 56% 0cm 47° 19°C 0mm 0.99kPa 24134m 6.4m/s 5m/s
15:00
34% 10°C 0mm 56% 0cm 43° 19°C 0mm 0.99kPa 24135m 6.6m/s 5m/s
16:00
25% 9.8°C 0mm 55% 0cm 37° 19°C 0mm 1kPa 24134m 7m/s 5m/s
17:00
20% 10°C 0mm 56% 0cm 29° 19°C 0mm 0.97kPa 24135m 6.9m/s 4.6m/s
18:00
16% 10°C 0mm 59% 0cm 20° 19°C 0mm 0.88kPa 24134m 6.6m/s 4.2m/s
19:00
11% 11°C 0mm 66% 0cm 12° 18°C 0mm 0.7kPa 24135m 4.3m/s 3.1m/s
20:00
11% 11°C 0mm 71% 0cm 2.8° 17°C 0mm 0.54kPa 24134m 3.5m/s 3.2m/s
21:00 ☾
11% 9.7°C 0mm 63% 0cm -5.8° 17°C 0mm 0.72kPa 24134m 10m/s 4.2m/s
22:00 ☾
11% 9.5°C 0mm 62% 0cm -13° 17°C 0mm 0.73kPa 24134m 8.6m/s 4.4m/s
23:00 ☾
10% 10°C 0mm 66% 0cm -20° 17°C 0mm 0.66kPa 24135m 9.3m/s 5.6m/s
Tue, Aug 25 Sunrise 06:12 Sunset 20:23
24:00 ☾
8% 11°C 0mm 70% 0cm -24° 16°C 0mm 0.54kPa 24134m 12m/s 6.1m/s
01:00 ☾
7% 11°C 0mm 74% 0cm -26° 15°C 0mm 0.45kPa 24134m 8.5m/s 4.7m/s
02:00 ☾
7% 11°C 0mm 75% 0cm -25° 15°C 0mm 0.44kPa 24134m 8.8m/s 4.5m/s
03:00 ☾
7% 11°C 0mm 75% 0cm -22° 15°C 0mm 0.43kPa 24134m 9m/s 4.3m/s
04:00 ☾
7% 11°C 0mm 76% 0cm -17° 15°C 0mm 0.42kPa 24135m 9.2m/s 4.1m/s
05:00 ☾
5% 11°C 0mm 67% 0cm -11° 17°C 0mm 0.65kPa 24135m 9m/s 5m/s
06:00 ☾
3% 11°C 0mm 58% 0cm -2.6° 19°C 0mm 0.92kPa 24135m 8.8m/s 5.9m/s
07:00
1% 10°C 0mm 50% 0cm 6° 21°C 0mm 1.3kPa 24135m 8.5m/s 6.8m/s
08:00
1% 9.9°C 0mm 48% 0cm 15° 22°C 0mm 1.3kPa 24135m 8.2m/s 6.4m/s
09:00
0% 9.7°C 0mm 46% 0cm 24° 22°C 0mm 1.4kPa 24135m 7.8m/s 6m/s
10:00
0% 9.5°C 0mm 44% 0cm 32° 23°C 0mm 1.5kPa 24135m 7.4m/s 5.7m/s
11:00
1% 9.4°C 0.01mm 46% 0cm 39° 22°C 0mm 1.4kPa 24135m 7.8m/s 5.1m/s
12:00
1% 9.3°C 0.02mm 48% 0cm 45° 21°C 0mm 1.3kPa 24135m 8.1m/s 4.5m/s
13:00
2% 9.2°C 0.03mm 51% 0cm 47° 20°C 0mm 1.1kPa 24135m 8.4m/s 3.9m/s
14:00
3% 9°C 0.02mm 53% 0cm 47° 19°C 0.04mm 1kPa 24135m 9.8m/s 4.2m/s
15:00
4% 8.7°C 0.01mm 55% 0cm 43° 18°C 0.08mm 0.93kPa 24135m 11m/s 4.5m/s
16:00
5% 8.4°C 0mm 57% 0cm 37° 17°C 0.13mm 0.83kPa 24135m 12m/s 4.8m/s
17:00
5% 8.9°C 0.003mm 62% 0cm 29° 16°C 0.15mm 0.7kPa 24135m 10m/s 4.3m/s
18:00
5% 9.4°C 0.007mm 67% 0cm 20° 15°C 0.17mm 0.57kPa 24135m 7.6m/s 3.7m/s
19:00
5% 9.7°C 0.01mm 72% 0cm 11° 15°C 0.19mm 0.46kPa 24135m 5.1m/s 3.2m/s
20:00
5% 9.9°C 0.007mm 76% 0cm 2.5° 14°C 0.15mm 0.38kPa 24135m 4.2m/s 3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

How opportunities work → Weather data sources →
Forecast generated

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