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Rule Cloudscapes

Pont Pen-y-benglog - Cloudscapes - Snowdonia (Eryri)

Bethesda, Wales, United Kingdom

Multi-layered dramatic clouds for striking sky photography

Currently

Real-time conditions
Cloud Cover100%
Wind Gusts9.4m/s
Precipitation Chance100%
Air Pressure1001.2hPa

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/London
Next opportunity
Dramatic Cloud Drama
Pont Pen-y-benglog
Tomorrow · 18:00–19:00 · 1h window
Medium confidence
53%
☁️Cloud Drama Score90.7%
Cloud Cover: 69%
Wind Gusts: 7.7m/s
Precipitation Chance: 58%
Air Pressure: 995.1hPa
overcast weather icon
Striking Cloud Drama
Pont Pen-y-benglog
Mon, Apr 13 · 09:00–10:00
☁️Cloud Drama Score:81.9%
Low
overcast weather icon
Dramatic Cloud Drama
Pont Pen-y-benglog
Wed, Apr 15 · 08:00–12:00
☁️Cloud Drama Score:78.1-100%
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
1matching hours in the next 95 hoursJump to next match
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
08:0026%0%4.5%5%24135m
09:0023%0%0%4.7%24134m
10:0023%0%0%4.5%24135m
11:0022%8.9%0%0%24134m
12:0040%55%0%0%24135m
13:0040%62%0%0%24134m
14:0025%92%0%0%24135m
15:0049%37%0%0%24134m
16:0065%20%0%77%24135m
17:0024%0.6%0%100%24135m
18:0023%0%0%100%24134m
19:0019%0%0%100%24135m
20:0013%1%0%100%24135m
21:0013%2.2%5%100%23097m
22:000.1%4.2%7.4%100%24134m
23:004.4%4.2%5%100%24135m
Thu, Apr 9
24:003.9%7%5%100%24135m
01:000.1%10%17%100%24135m
02:000%8%100%100%24134m
03:000%1%100%100%24134m
04:000%0%100%100%24135m
05:000.1%0%100%100%24134m
06:0058%7.8%100%100%24135m
07:0071%22%38%100%8555m
08:0046%100%5%100%3367m
09:0065%100%14%100%896m
10:0069%100%47%15%1441m
11:0053%97%70%100%24135m
12:0043%84%52%100%24134m
13:0047%100%97%0.2%17036m
14:0038%97%10%0%24135m
15:0034%80%0%0%5909m
16:0044%78%0%0%14733m
17:0055%95%14%0%22004m
18:0028%5%0%0%24135m
19:0024%1.2%0%0%24135m
20:0022%5%0%0%24135m
21:0046%21%0%0%23961m
22:0013%76%0%0%24134m
23:0010%50%27%0%21886m
Fri, Apr 10
24:0015%19%4.8%0%24135m
01:0015%16%45%65%24134m
02:0015%5.6%78%100%24135m
03:0013%5%100%100%24135m
04:002.9%5%100%100%24135m
05:002.9%5%100%100%24134m
06:0043%5%100%100%24135m
07:0043%8.1%100%100%24135m
08:0049%93%100%100%24134m
09:0052%86%100%100%24134m
10:0049%50%100%100%24135m
11:0048%15%100%100%24135m
12:0038%54%100%100%24135m
13:0041%82%100%100%24135m
14:0041%26%100%100%24135m
15:0041%25%100%100%24134m
16:0048%81%100%4.5%24135m
17:0066%78%93%41%24134m
18:0091%32%66%4.5%24135m
19:0064%100%100%4.8%1688m
20:0074%55%87%5%8454m
21:0069%35%8.8%0%24135m
22:0012%81%9%0%24134m
23:009.3%100%1.3%0%14154m
Sat, Apr 11
24:004.1%100%100%0%5600m
01:000.1%100%36%78%8482m
02:000%100%37%3.5%13682m
03:000%100%63%9.5%13273m
04:000.1%100%99%1.1%61m
05:000%100%100%0%66m
06:0062%100%26%4.6%284m
07:0030%100%8.4%0%24135m
08:0053%100%83%0%24134m
09:0077%14%83%0%24134m
10:0026%4.6%8.6%0%24134m
11:0045%5%90%0%24135m
12:0028%5%5%0%24135m
13:0046%23%5%0%24134m
14:0054%49%3.4%0%20039m
15:0051%74%1.9%0%15945m
16:0038%100%0.3%0%11850m
17:0066%100%34%0%8710m
18:0075%100%67%0%5571m
19:0079%100%100%0%2431m
20:0064%100%77%0%9340m
21:0055%100%53%0%16249m
22:000%100%30%0%23157m
23:000%100%47%0%16555m
Sun, Apr 12
24:000%100%63%0%9953m
01:000%99%79%0%3352m
02:000%96%84%0%9014m
03:000%93%88%0%14677m
04:000%91%92%0%20340m
05:000%91%63%0%20850m
06:0069%92%33%0%21361m
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 06:31 Sunset 20:05
09:00
1001hPa 100% 14% 100% 93% 21° 100% 9.4m/s 5.6m/s
10:00
1001hPa 15% 47% 100% 95% 30° 100% 8.4m/s 4.6m/s
11:00
1002hPa 100% 70% 100% 89% 37° 100% 12m/s 7.8m/s
12:00
1002hPa 100% 52% 100% 76% 42° 100% 11m/s 7.4m/s
13:00
1002hPa 0% 97% 100% 85% 44° 100% 12m/s 10m/s
14:00
1003hPa 0% 10% 85% 82% 44° 97% 12m/s 6.7m/s
15:00
1004hPa 0% 0% 71% 75% 40° 80% 12m/s 9.3m/s
16:00
1004hPa 0% 0% 56% 74% 34° 78% 12m/s 9.4m/s
17:00
1004hPa 0% 14% 56% 72% 26° 94% 13m/s 9.6m/s
18:00
1004hPa 0% 0% 56% 71% 18° 5% 13m/s 9m/s
19:00
1005hPa 0% 0% 56% 70% 1% 12m/s 8.4m/s
20:00
1006hPa 0% 0% 37% 73% 0.47° 5% 12m/s 8.4m/s
21:00
1007hPa 0% 0% 19% 78% -8.4° 21% 11m/s 7m/s
22:00
1007hPa 0% 0% 0% 81% -16° 76% 10m/s 6.4m/s
23:00
1008hPa 0% 27% 0% 80% -22° 50% 9.6m/s 6.1m/s
Fri, Apr 10 Sunrise 06:31 Sunset 20:05
24:00
1007hPa 0% 5% 0% 81% -27° 19% 8.7m/s 4.9m/s
01:00
1008hPa 65% 45% 0% 80% -29° 66% 9.2m/s 5.1m/s
02:00
1008hPa 100% 78% 0% 79% -28° 100% 8.6m/s 4.5m/s
03:00
1008hPa 100% 100% 0% 77% -25° 100% 8.1m/s 4.4m/s
04:00
1008hPa 100% 100% 0% 75% -20° 100% 6.9m/s 3.5m/s
05:00
1007hPa 100% 100% 0% 74% -13° 100% 3.8m/s 2.8m/s
06:00
1007hPa 100% 100% 0% 73% -4.9° 100% 2.9m/s 2.6m/s
07:00
1006hPa 100% 100% 0% 72% 3.9° 100% 2.3m/s 2.4m/s
08:00
1006hPa 100% 100% 13% 71% 13° 100% 3m/s 2.7m/s
09:00
1006hPa 100% 100% 26% 67% 22° 100% 2.9m/s 2.5m/s
10:00
1005hPa 100% 100% 39% 62% 30° 100% 3m/s 2.3m/s
11:00
1005hPa 100% 100% 54% 57% 37° 100% 3.2m/s 2.2m/s
12:00
1004hPa 100% 100% 69% 54% 42° 100% 4.5m/s 2.8m/s
13:00
1003hPa 100% 100% 84% 53% 45° 100% 5.6m/s 3.5m/s
14:00
1002hPa 100% 100% 72% 58% 44° 100% 6.9m/s 4.8m/s
15:00
1000hPa 100% 100% 61% 62% 40° 100% 7.5m/s 4.5m/s
16:00
999hPa 4% 100% 50% 64% 34° 100% 8.1m/s 3.8m/s
17:00
997hPa 41% 93% 54% 68% 27° 93% 7.1m/s 3.8m/s
18:00
995hPa 4% 66% 58% 77% 18° 69% 7.7m/s 4.8m/s
19:00
994hPa 5% 100% 62% 84% 9.2° 100% 8.9m/s 4.1m/s
20:00
993hPa 5% 87% 73% 92% 0.69° 87% 8.7m/s 4.2m/s
21:00
991hPa 0% 9% 85% 84% -8.2° 35% 12m/s 6.1m/s
22:00
990hPa 0% 9% 97% 79% -16° 81% 17m/s 6.4m/s
23:00
988hPa 0% 1% 98% 79% -22° 100% 14m/s 6.8m/s
Sat, Apr 11 Sunrise 06:29 Sunset 20:07
24:00
987hPa 0% 100% 99% 84% -26° 100% 18m/s 7.9m/s
01:00
985hPa 78% 36% 100% 87% -28° 100% 17m/s 6.9m/s
02:00
984hPa 4% 37% 93% 86% -28° 100% 11m/s 5.6m/s
03:00
984hPa 10% 63% 86% 90% -25° 100% 5.3m/s 2.9m/s
04:00
987hPa 1% 99% 79% 100% -20° 100% 8.8m/s 6.1m/s
05:00
987hPa 0% 100% 81% 97% -13° 100% 4.2m/s 2.8m/s
06:00
986hPa 5% 26% 83% 97% -4.5° 100% 3.8m/s 3.6m/s
07:00
986hPa 0% 8% 85% 86% 4.3° 100% 5m/s 2.8m/s
08:00
986hPa 0% 83% 77% 83% 13° 100% 4.2m/s 3m/s
09:00
986hPa 0% 83% 70% 80% 22° 83% 6.5m/s 4m/s
10:00
986hPa 0% 9% 63% 72% 30° 9% 7m/s 4.7m/s
11:00
986hPa 0% 90% 72% 64% 37° 90% 8.5m/s 6.7m/s
12:00
986hPa 0% 5% 82% 59% 43° 5% 9.6m/s 6.8m/s
13:00
986hPa 0% 5% 91% 61% 45° 23% 12m/s 9.2m/s
14:00
977hPa 0% 3% 91% 71% 44° 49% 13m/s 8.5m/s
15:00
969hPa 0% 2% 91% 81% 41° 74% 14m/s 7.9m/s
16:00
961hPa 0% 0% 91% 92% 35° 100% 15m/s 7.2m/s
17:00
960hPa 0% 34% 94% 93% 27° 100% 15m/s 7.9m/s
18:00
960hPa 0% 67% 96% 95% 18° 100% 15m/s 8.6m/s
19:00
960hPa 0% 100% 99% 97% 9.5° 100% 15m/s 9.3m/s
20:00
960hPa 0% 77% 94% 95% 0.92° 100% 15m/s 9.1m/s
21:00
961hPa 0% 53% 88% 94% -7.9° 100% 14m/s 9m/s
22:00
961hPa 0% 30% 83% 93% -15° 100% 14m/s 8.8m/s
23:00
962hPa 0% 47% 85% 92% -22° 100% 14m/s 9.2m/s
Sun, Apr 12 Sunrise 06:26 Sunset 20:08
24:00
963hPa 0% 63% 87% 91% -26° 100% 15m/s 9.5m/s
01:00
964hPa 0% 79% 90% 89% -28° 100% 16m/s 9.9m/s
02:00
964hPa 0% 84% 88% 90% -28° 97% 15m/s 10m/s
03:00
965hPa 0% 88% 86% 90% -24° 95% 15m/s 10m/s
04:00
966hPa 0% 92% 84% 91% -19° 92% 15m/s 10m/s
05:00
967hPa 0% 63% 87% 90% -12° 92% 16m/s 11m/s
06:00
967hPa 0% 33% 89% 89% -4.2° 93% 16m/s 11m/s
07:00
968hPa 0% 4% 92% 88% 4.6° 93% 16m/s 11m/s
08:00
969hPa 0% 3% 83% 85% 13° 64% 16m/s 11m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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