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Rule Fog Hunter

Fog Hunter Forecast for Rhinog Fawr, Snowdonia (Eryri)

Harlech, Wales, United Kingdom

A rugged western mountain of bare rock, heather and scattered lakes rises above ancient woodland and distant Cardigan Bay views.

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread3.4°C
Visibility24135 (Clear)
Relative Humidity79%
Wind Speed2.7m/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 Rhinog Fawr.

Explore Fog Hunter conditions across Snowdonia (Eryri) →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Rhinog Fawr during the last 365 days.

Last 30 days
11
recorded matching windows · 75% average confidence
Last 90 days
32
recorded matching windows · 76% average confidence
Last 365 days
38
recorded matching windows · 78% average confidence
Most frequent recorded start hour

04:00 local time, shared by 6 of 38 matches recorded in the last 365 days.

Most represented month

July, with 18 of 38 matches recorded in the last 365 days.

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 06:09 Sunset 20:27
21:00 ☾
87% 8.4°C 0mm 79% 0cm -5.2° 12°C 0mm 0.29kPa 24135m 3m/s 2.7m/s
22:00 ☾
99% 8°C 0mm 83% 0cm -13° 11°C 0mm 0.22kPa 24135m 3m/s 2.8m/s
23:00 ☾
99% 7.7°C 0mm 85% 0cm -19° 10°C 0mm 0.19kPa 24134m 2.8m/s 2.7m/s
Sun, Aug 23 Sunrise 06:09 Sunset 20:27
24:00 ☾
98% 7.3°C 0mm 85% 0cm -23° 9.8°C 0mm 0.18kPa 24134m 2.7m/s 2.7m/s
01:00 ☾
98% 6.9°C 0mm 84% 0cm -25° 9.5°C 0mm 0.19kPa 24134m 2.6m/s 2.6m/s
02:00 ☾
79% 6.5°C 0mm 83% 0cm -25° 9.2°C 0mm 0.2kPa 24134m 2.7m/s 2.6m/s
03:00 ☾
61% 6.1°C 0mm 83% 0cm -22° 8.9°C 0mm 0.19kPa 24134m 2.4m/s 2.4m/s
04:00 ☾
42% 5.9°C 0mm 83% 0cm -17° 8.6°C 0mm 0.19kPa 24134m 2.5m/s 2.5m/s
05:00 ☾
34% 5.8°C 0mm 84% 0cm -10° 8.4°C 0mm 0.18kPa 24134m 2.3m/s 2.4m/s
06:00 ☾
27% 5.8°C 0mm 84% 0cm -2.3° 8.3°C 0mm 0.17kPa 24135m 2.4m/s 2.5m/s
07:00
19% 5.9°C 0mm 83% 0cm 6.4° 8.7°C 0mm 0.19kPa 24135m 2.3m/s 2.3m/s
08:00
15% 6.7°C 0mm 75% 0cm 15° 11°C 0mm 0.33kPa 24135m 2m/s 1.8m/s
09:00
12% 7°C 0mm 66% 0cm 24° 13°C 0mm 0.5kPa 24134m 1.6m/s 1.4m/s
10:00
8% 7°C 0mm 59% 0cm 33° 15°C 0mm 0.7kPa 24134m 1.1m/s 0.6m/s
11:00
8% 7°C 0mm 54% 0cm 40° 16°C 0mm 0.85kPa 24134m 0.92m/s 0.96m/s
12:00
8% 7.2°C 0mm 53% 0cm 46° 17°C 0mm 0.91kPa 24135m 1.2m/s 1.7m/s
13:00
8% 7.4°C 0mm 52% 0cm 48° 17°C 0mm 0.93kPa 24135m 1.4m/s 2.4m/s
14:00
30% 7.5°C 0mm 53% 0cm 48° 17°C 0mm 0.92kPa 24135m 1.5m/s 2.5m/s
15:00
53% 7.5°C 0mm 54% 0cm 44° 17°C 0mm 0.9kPa 24134m 1.3m/s 2.4m/s
16:00
75% 7.6°C 0mm 54% 0cm 37° 17°C 0mm 0.88kPa 24135m 1.3m/s 2.1m/s
17:00
80% 8°C 0mm 55% 0cm 30° 17°C 0mm 0.87kPa 24135m 1.2m/s 1.4m/s
18:00
84% 8.5°C 0mm 56% 0cm 21° 17°C 0mm 0.86kPa 24134m 1.2m/s 1.2m/s
19:00
89% 11°C 0mm 68% 0cm 12° 17°C 0mm 0.61kPa 24135m 1.3m/s 1.4m/s
20:00
91% 10°C 0mm 74% 0cm 3.1° 15°C 0mm 0.43kPa 24134m 1.7m/s 1.7m/s
21:00 ☾
92% 9.4°C 0mm 77% 0cm -5.5° 13°C 0mm 0.36kPa 24134m 3m/s 2.7m/s
22:00 ☾
94% 8.8°C 0mm 78% 0cm -13° 13°C 0mm 0.31kPa 24134m 3.5m/s 3.3m/s
23:00 ☾
94% 8.4°C 0mm 78% 0cm -19° 12°C 0mm 0.31kPa 24134m 4m/s 3.6m/s
Mon, Aug 24 Sunrise 06:11 Sunset 20:25
24:00 ☾
94% 7.8°C 0mm 76% 0cm -24° 12°C 0mm 0.34kPa 24134m 4m/s 3.7m/s
01:00 ☾
94% 7.3°C 0mm 74% 0cm -26° 12°C 0mm 0.35kPa 24134m 4.2m/s 3.8m/s
02:00 ☾
91% 7°C 0mm 74% 0cm -25° 11°C 0mm 0.34kPa 24134m 3.9m/s 3.6m/s
03:00 ☾
89% 7°C 0mm 76% 0cm -22° 11°C 0mm 0.32kPa 24134m 4.8m/s 4.2m/s
04:00 ☾
86% 6.8°C 0mm 75% 0cm -17° 11°C 0mm 0.32kPa 24135m 5.1m/s 4.4m/s
05:00 ☾
83% 6.6°C 0mm 74% 0cm -11° 11°C 0mm 0.35kPa 24134m 5m/s 4.2m/s
06:00 ☾
81% 6.4°C 0mm 74% 0cm -2.5° 11°C 0mm 0.34kPa 24134m 4.2m/s 3.7m/s
07:00
78% 6.7°C 0mm 74% 0cm 6.1° 11°C 0mm 0.34kPa 24134m 3.6m/s 3.4m/s
08:00
73% 7.8°C 0mm 70% 0cm 15° 13°C 0mm 0.45kPa 24134m 3.9m/s 3.4m/s
09:00
67% 8.4°C 0mm 63% 0cm 24° 15°C 0mm 0.65kPa 24135m 3.9m/s 3.3m/s
10:00
62% 8.9°C 0mm 58% 0cm 32° 17°C 0mm 0.81kPa 24135m 5.2m/s 3.1m/s
11:00
59% 9.1°C 0mm 56% 0cm 40° 18°C 0mm 0.89kPa 24134m 5.4m/s 3.5m/s
12:00
56% 9.2°C 0mm 53% 0cm 45° 19°C 0mm 1kPa 24134m 6.5m/s 4.5m/s
13:00
53% 8.8°C 0mm 49% 0cm 48° 20°C 0mm 1.2kPa 24134m 6.3m/s 4.6m/s
14:00
44% 8.3°C 0mm 46% 0cm 47° 20°C 0mm 1.3kPa 24134m 6.4m/s 4.7m/s
15:00
34% 7.5°C 0mm 44% 0cm 43° 20°C 0mm 1.3kPa 24135m 6.7m/s 5m/s
16:00
25% 7.1°C 0mm 42% 0cm 37° 20°C 0mm 1.4kPa 24134m 6.9m/s 4.9m/s
17:00
20% 7.8°C 0mm 44% 0cm 29° 20°C 0mm 1.3kPa 24135m 6.8m/s 4.1m/s
18:00
16% 7.9°C 0mm 46% 0cm 21° 20°C 0mm 1.3kPa 24134m 6.9m/s 4m/s
19:00
11% 7.7°C 0mm 49% 0cm 12° 19°C 0mm 1.1kPa 24135m 7.3m/s 3.9m/s
20:00
11% 7.4°C 0mm 52% 0cm 2.8° 17°C 0mm 0.96kPa 24134m 6.5m/s 3.5m/s
21:00 ☾
11% 7.5°C 0mm 51% 0cm -5.9° 18°C 0mm 0.98kPa 24134m 12m/s 5.6m/s
22:00 ☾
11% 9.6°C 0mm 60% 0cm -13° 17°C 0mm 0.79kPa 24134m 12m/s 5.8m/s
23:00 ☾
10% 10°C 0mm 66% 0cm -20° 16°C 0mm 0.63kPa 24135m 12m/s 5.2m/s
Tue, Aug 25 Sunrise 06:13 Sunset 20:23
24:00 ☾
8% 10°C 0mm 71% 0cm -24° 15°C 0mm 0.52kPa 24134m 12m/s 4.8m/s
01:00 ☾
7% 10°C 0mm 78% 0cm -26° 14°C 0mm 0.36kPa 24134m 9.3m/s 4.2m/s
02:00 ☾
7% 11°C 0mm 77% 0cm -26° 14°C 0mm 0.38kPa 24134m 9.3m/s 4.1m/s
03:00 ☾
7% 11°C 0mm 76% 0cm -23° 15°C 0mm 0.4kPa 24134m 9.3m/s 4.1m/s
04:00 ☾
7% 11°C 0mm 76% 0cm -18° 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 -2.8° 19°C 0mm 0.92kPa 24135m 8.8m/s 5.9m/s
07:00
1% 10°C 0mm 50% 0cm 5.9° 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 40° 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 48° 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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