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Rule Cloudscapes

Rhinog Fawr - Cloudscapes - Snowdonia (Eryri)

Harlech, Wales, United Kingdom

Multi-layered dramatic clouds for striking sky photography

Currently

Real-time conditions
Cloud Cover100%
Wind Gusts4.9m/s
Precipitation Chance66%
Air Pressure998.7hPa

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
Next opportunity
Dramatic Cloud Drama at Sunset
Rhinog Fawr
Sun, Apr 12 · 20:00–21:00 · 1h window
Medium confidence
40%
☁️Cloud Drama Score91%
Cloud Cover: 48%
Wind Gusts: 4.2m/s
Precipitation Chance: 74%
Air Pressure: 973.4hPa
overcast weather icon
Striking Cloud Drama
Rhinog Fawr
Wed, Apr 15 · 09:00–10:00
☁️Cloud Drama Score:80.6%
Low
overcast weather icon
Dramatic Cloud Drama at Sunrise
Rhinog Fawr
Fri, Apr 17 · 06:00–07:00
☁️Cloud Drama Score:100%
Medium
overcast weather icon
Dramatic Cloud Drama
Rhinog Fawr
Fri, Apr 17 · 18:00–19:00
☁️Cloud Drama Score:85.8%
Low

What this forecast looks for

Plain-language explanation from the rule

This forecast identifies when dramatic cloud formations combine with mountain topography to create powerful sky-dominated compositions in Snowdonia. We track cloud types, movement patterns, and weather system dynamics to predict optimal cloudscape photography conditions.

Snowdonia's high peaks intercept Atlantic weather systems, creating dramatic cloud interactions as moisture-laden air is forced upward over mountain barriers. The result is constantly changing cloudscapes—from cloud waterfalls pouring over passes to lenticular formations stacking over summits, and dramatic storm systems sweeping through valleys. The region's notorious weather variability means cloud drama is a near-constant feature of the mountain landscape.

What makes Snowdonia cloudscape photography distinctive:

  • Orographic effects - Mountains force air upward, creating dramatic cloud formations at summits and passes
  • Tryfan drama - The iconic north face often has cloud streaming across its buttresses and ridges
  • Valley systems - Llanberis Pass and Ogwen Valley channel weather, creating dynamic cloud movement
  • Rapid changes - Atlantic weather systems bring quickly evolving conditions with dramatic light breaks

The most dramatic cloudscapes occur during and immediately after frontal passage—when weather systems move through and clearing begins. Ogwen Valley is particularly productive for cloudscape photography—position yourself at Llyn Ogwen or the Pont Pen-y-benglog bridge to capture cloud drama over Tryfan and the Glyderau range. The confined valley channels weather systems, creating spectacular cloud movement. Llanberis Pass shows dramatic cloud interactions with steep valley walls—clouds pour over Snowdon's eastern slopes or stream through the pass itself. Capel Curig sits at a junction of valleys, creating varied cloudscape compositions with Snowdon, Moel Siabod, and the Carneddau all visible under different sky conditions. For elevated cloudscape photography, the ridge of Pen yr Ole Wen provides dramatic perspectives with cloud systems moving through the valley below. Autumn and winter (October-March) deliver the most dramatic cloudscape conditions as Atlantic storm systems are more frequent and vigorous. Our forecast identifies conditions when cloud formations are photogenic rather than simply overcast—tracking when broken skies create light and shadow play across mountain faces.

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72-hour requirements breakdown

What passed or failed, hour by hour
0matching hours in the next 95 hours
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time
Europe/London
Cloud Drama Score
≥ 75.0%
Low Clouds
≥ 20.0%
Mid-Level Clouds
OR1·B1
≥ 30.0%
High Clouds
OR1·B2
≥ 40.0%
Visibility
≥ 5000.0m
Wed, Apr 8
02:0012%0%0%46%24135m
03:0014%0%0%57%24134m
04:005.1%0%2.7%22%24135m
05:0014%0%0.7%71%24134m
06:0041%0.1%0%81%24134m
07:0074%3.3%2.8%32%24135m
08:0027%0.1%0%5.8%24135m
09:0025%0%0%5%24134m
10:0025%0%0%5%24135m
11:0025%0%0%5%24134m
12:0039%29%0%4.9%397m
13:0042%31%0%2.7%170m
14:0035%29%0%0%288m
15:0038%30%0%0%272m
16:0054%31%0%3.3%276m
17:0040%31%0%100%294m
18:0043%31%0%100%326m
19:0043%31%0%100%407m
20:0039%32%0%100%746m
21:0035%27%0%100%3260m
22:003.4%12%0%100%24134m
23:001.1%23%0%100%24135m
Thu, Apr 9
24:007.8%36%0%100%10988m
01:002%43%0%100%2510m
02:000%43%99%100%4138m
03:000%34%100%100%3822m
04:000.1%27%100%100%3640m
05:000%26%98%100%4257m
06:0051%52%5%100%24134m
07:0051%100%3.6%100%24134m
08:0046%100%5.7%100%24134m
09:0083%100%64%13%1155m
10:0055%100%62%73%199m
11:0053%100%100%100%2970m
12:0045%100%100%100%24135m
13:0032%94%6.9%100%21060m
14:0053%92%16%71%14217m
15:0055%92%81%78%9422m
16:0055%99%20%0%17662m
17:0036%86%0%0%16268m
18:0059%79%0%0%17140m
19:0030%7.9%0%0%24135m
20:0018%5%0%0%24135m
21:0052%5%18%0%24134m
22:0015%5%12%0.8%24134m
23:0015%5%20%35%24135m
Fri, Apr 10
24:0012%5%100%100%24134m
01:007.6%11%67%100%24135m
02:002%5%100%100%24134m
03:000.3%5%100%100%24134m
04:004%5%100%100%24135m
05:000%33%100%100%24134m
06:0053%98%100%100%24134m
07:0056%94%100%100%24135m
08:0052%85%100%100%24134m
09:0055%96%100%100%24134m
10:0048%95%100%100%24135m
11:0048%52%100%100%24135m
12:0040%90%100%100%24134m
13:0041%100%100%100%24134m
14:0040%92%100%100%16252m
15:0042%94%100%100%18984m
16:0068%100%99%18%23408m
17:0055%88%62%74%24134m
18:0063%100%45%3.5%16688m
19:0074%100%16%5%23992m
20:0062%100%5.1%91%3777m
21:0067%100%43%5.3%24134m
22:001.1%100%100%3.5%6929m
23:001%100%99%0.8%24134m
Sat, Apr 11
24:000%100%100%31%8645m
01:000%100%61%0.8%21722m
02:009.1%100%0%4.3%4983m
03:0015%100%0%91%5911m
04:0015%68%0%86%24135m
05:0015%4.8%0.5%98%24135m
06:0061%94%0%81%22800m
07:0077%89%1.8%15%24135m
08:0068%93%23%9.9%17284m
09:0062%96%43%4.9%10433m
10:0048%100%64%0%3582m
11:0051%89%57%0%10106m
12:0064%78%50%0%16629m
13:0067%67%42%0%23153m
14:0068%78%30%0.03%18326m
15:0050%89%17%0.07%13500m
16:0035%100%5%0.1%8673m
17:0055%100%13%0.07%7203m
18:0069%100%22%0.03%5732m
19:0069%100%30%0%4261m
20:0069%100%50%0%5793m
21:0055%100%70%0%7324m
22:000%100%89%0%8856m
23:000%100%93%0%8942m
Sun, Apr 12
24:000%100%96%0%9028m
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity). For OR groups, only one branch is required, so some OR-branch predicates can be ✕ even in a matching hour.

What does Cloud Drama Score 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
Air Pressure
hPa
High Clouds
%
Mid-Level Clouds
%
Precipitation Chance
%
Relative Humidity
%
Solar Elevation
°
Total Cloud Coverage
%
Wind Gusts
m/s
Wind Speed
m/s
Thu, Apr 9 Sunrise 06:32 Sunset 20:04
03:00
999hPa 100% 100% 66% 96% -26° 100% 4.9m/s 2.5m/s
04:00
998hPa 100% 100% 100% 95% -21° 100% 6.4m/s 3.1m/s
05:00
998hPa 100% 98% 100% 94% -14° 100% 8m/s 3.6m/s
06:00
998hPa 100% 5% 100% 91% -5.4° 100% 10m/s 4.5m/s
07:00
997hPa 100% 4% 100% 90% 3.6° 100% 11m/s 5m/s
08:00
997hPa 100% 6% 99% 92% 12° 100% 12m/s 5.6m/s
09:00
997hPa 13% 64% 98% 98% 21° 100% 13m/s 6.5m/s
10:00
997hPa 73% 62% 96% 99% 30° 100% 11m/s 6.5m/s
11:00
997hPa 100% 100% 96% 97% 37° 100% 9.6m/s 6m/s
12:00
997hPa 100% 100% 97% 86% 42° 100% 9.2m/s 6m/s
13:00
998hPa 100% 7% 97% 87% 45° 100% 10m/s 7.5m/s
14:00
998hPa 71% 16% 72% 85% 44° 93% 9.9m/s 7.2m/s
15:00
998hPa 78% 81% 47% 80% 40° 93% 9.5m/s 7.1m/s
16:00
998hPa 0% 20% 22% 79% 34° 99% 9.8m/s 6.7m/s
17:00
999hPa 0% 0% 36% 76% 27° 86% 11m/s 7.3m/s
18:00
999hPa 0% 0% 50% 75% 18° 79% 11m/s 7.5m/s
19:00
1000hPa 0% 0% 64% 75% 8% 11m/s 7m/s
20:00
1000hPa 0% 0% 43% 74% 0.43° 5% 9.6m/s 5.7m/s
21:00
1001hPa 0% 18% 21% 72% -8.6° 18% 10m/s 6.3m/s
22:00
1001hPa 1% 12% 0% 71% -16° 12% 10m/s 6.4m/s
23:00
1002hPa 35% 20% 0% 72% -23° 40% 10m/s 6.7m/s
Fri, Apr 10 Sunrise 06:32 Sunset 20:04
24:00
1002hPa 100% 100% 0% 72% -27° 100% 9.4m/s 6.3m/s
01:00
1002hPa 100% 67% 0% 72% -29° 100% 8.7m/s 5.9m/s
02:00
1001hPa 100% 100% 0% 72% -29° 100% 7.3m/s 4.2m/s
03:00
1001hPa 100% 100% 0% 72% -25° 100% 6.2m/s 3.1m/s
04:00
1001hPa 100% 100% 0% 71% -20° 100% 4.4m/s 1.9m/s
05:00
1001hPa 100% 100% 0% 70% -13° 100% 2.5m/s 1.2m/s
06:00
1000hPa 100% 100% 0% 68% -5° 100% 1.6m/s 0.64m/s
07:00
1000hPa 100% 100% 0% 67% 3.9° 100% 1.3m/s 0.61m/s
08:00
1000hPa 100% 100% 17% 66% 13° 100% 2.1m/s 1.4m/s
09:00
999hPa 100% 100% 33% 64% 22° 100% 3.1m/s 2.1m/s
10:00
999hPa 100% 100% 50% 63% 30° 100% 3.9m/s 2.4m/s
11:00
998hPa 100% 100% 58% 60% 37° 100% 5.3m/s 3.5m/s
12:00
997hPa 100% 100% 66% 57% 42° 100% 6.2m/s 4.6m/s
13:00
996hPa 100% 100% 74% 58% 45° 100% 7.2m/s 5.6m/s
14:00
995hPa 100% 100% 59% 69% 44° 100% 7.5m/s 5.8m/s
15:00
994hPa 100% 100% 45% 73% 41° 100% 8m/s 6.2m/s
16:00
993hPa 18% 99% 30% 74% 35° 100% 8.2m/s 6.1m/s
17:00
991hPa 74% 62% 41% 77% 27° 91% 8.9m/s 5.9m/s
18:00
990hPa 4% 45% 51% 83% 18° 100% 9.6m/s 6m/s
19:00
988hPa 5% 16% 62% 91% 9.2° 100% 12m/s 5.6m/s
20:00
987hPa 91% 5% 74% 94% 0.65° 100% 12m/s 6.1m/s
21:00
985hPa 5% 43% 86% 81% -8.3° 100% 14m/s 7m/s
22:00
984hPa 4% 100% 97% 82% -16° 100% 17m/s 9.3m/s
23:00
982hPa 1% 99% 98% 84% -22° 100% 19m/s 10m/s
Sat, Apr 11 Sunrise 06:29 Sunset 20:06
24:00
980hPa 30% 100% 99% 86% -27° 100% 19m/s 11m/s
01:00
979hPa 1% 61% 100% 87% -29° 100% 19m/s 11m/s
02:00
979hPa 4% 0% 86% 94% -28° 100% 14m/s 8.9m/s
03:00
980hPa 91% 0% 73% 88% -25° 100% 15m/s 8.8m/s
04:00
980hPa 86% 0% 59% 80% -20° 89% 14m/s 8.8m/s
05:00
980hPa 98% 0% 61% 80% -13° 98% 14m/s 9.8m/s
06:00
980hPa 81% 0% 64% 81% -4.7° 96% 13m/s 9.9m/s
07:00
981hPa 15% 2% 66% 81% 4.2° 89% 12m/s 9.2m/s
08:00
975hPa 10% 23% 60% 79% 13° 93% 13m/s 8.8m/s
09:00
969hPa 5% 43% 55% 77% 22° 96% 15m/s 8.4m/s
10:00
963hPa 0% 64% 49% 74% 30° 100% 16m/s 8m/s
11:00
963hPa 0% 57% 63% 79% 38° 90% 17m/s 9.2m/s
12:00
962hPa 0% 50% 77% 83% 43° 80% 18m/s 10m/s
13:00
962hPa 0% 42% 90% 87% 45° 70% 19m/s 12m/s
14:00
962hPa 0% 30% 91% 89% 45° 80% 19m/s 12m/s
15:00
962hPa 0% 17% 91% 91% 41° 90% 18m/s 12m/s
16:00
962hPa 0% 5% 92% 93% 35° 100% 18m/s 12m/s
17:00
962hPa 0% 13% 93% 94% 27° 100% 18m/s 12m/s
18:00
962hPa 0% 22% 94% 94% 18° 100% 18m/s 12m/s
19:00
962hPa 0% 30% 96% 95% 9.5° 100% 17m/s 12m/s
20:00
962hPa 0% 50% 89% 94% 0.87° 100% 16m/s 11m/s
21:00
961hPa 0% 70% 82% 94% -8° 100% 16m/s 9.9m/s
22:00
961hPa 0% 89% 75% 94% -16° 100% 15m/s 9m/s
23:00
961hPa 0% 93% 81% 94% -22° 100% 14m/s 8.3m/s
Sun, Apr 12 Sunrise 06:27 Sunset 20:08
24:00
961hPa 0% 96% 87% 95% -26° 100% 13m/s 7.5m/s
01:00
962hPa 0% 99% 93% 95% -28° 100% 11m/s 6.7m/s
02:00
962hPa 0% 99% 93% 94% -28° 100% 12m/s 7.4m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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