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Rule Cloudscapes

Sapa - Cloudscapes - Vietnam

Sa Pa, Lào Cai Province, Vietnam

Multi-layered dramatic clouds for striking sky photography

Currently

Real-time conditions
Cloud Cover84%
Wind Gusts0.8m/s
Precipitation Chance50%
Air Pressure861.7hPa

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Bangkok
cloudscapes weather icon
Next opportunity
Dramatic Cloud Drama
Sapa
Tomorrow · 15:00–16:00 · 1h window
Medium confidence
57%
☁️Cloud Drama Score95.6%
Cloud Cover: 58%
Wind Gusts: 2.3m/s
Precipitation Chance: 78%
Air Pressure: 860.1hPa
cloudscapes weather icon
Dramatic Cloud Drama
Sapa
Sat, Jul 11 · 10:00–11:00
☁️Cloud Drama Score:95.4%
Medium

What this forecast looks for

Plain-language explanation from the rule

This forecast tracks dramatic cloud conditions across Vietnam's varied landscapes, from monsoon systems moving over coastal areas to orographic clouds forming around mountain peaks. We analyze cloud types, coverage patterns, weather system movement, and seasonal monsoon patterns to predict when sky drama combines with Vietnam's distinctive natural and cultural features.

Vietnam's location in Southeast Asia's monsoon region and its dramatic topography—mountains exceeding 10,000 feet alongside extensive coastline—create dynamic cloud conditions. The wet season (May through September in the north) brings towering cumulus and cumulonimbus formations, while the dry season offers clearer skies with occasional dramatic frontal systems. Mountains around Sapa and Da Lat generate orographic clouds year-round.

What makes Vietnam cloudscape photography special:

  • Limestone karst drama - Ha Long Bay's thousands of islands provide epic foreground elements under monsoon cloudscapes and clearing storms
  • Mountain cloud formations - Sapa and Mu Cang Chai valleys fill with clouds that interact with rice terraces and mountain peaks
  • Coastal weather systems - Da Nang's coastline and Marble Mountains create dramatic compositions as weather systems approach from the South China Sea
  • Cave country atmospherics - Phong Nha's jungle-clad limestone mountains under turbulent tropical skies create moody, atmospheric conditions

Ha Long Bay offers Vietnam's most dramatic cloudscape potential—thousands of limestone karsts provide endless compositional possibilities under monsoon clouds. Late afternoon during wet season (June-September) brings towering cumulus, while shoulder seasons offer the most dynamic conditions. Sapa's high elevation means clouds often form below the town, creating opportunities to photograph valleys filled with clouds while peaks pierce through. Da Nang's Dragon Bridge and Marble Mountains work exceptionally well under dramatic skies. The Hai Van Pass between Da Nang and Hue frequently experiences dramatic cloud conditions where mountains meet the sea. Wet season delivers the most dramatic cloudscapes but requires rain protection.

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72-hour requirements breakdown

What passed or failed, hour by hour
2matching hours in the next 80 hoursJump to next match
OR logic: one branch per group is enough
Meets requirement
Misses requirement
Time
Asia/Bangkok
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, Jul 8
12:0044%70%84%100%4503m
13:0045%62%100%100%12719m
14:0043%46%100%77%12240m
15:0062%36%100%58%24135m
16:0051%28%100%100%24134m
17:0057%16%100%100%24134m
18:0058%24%100%100%24134m
19:0058%30%98%100%17487m
20:000.7%29%93%100%17384m
21:004.3%25%84%49%17370m
22:006.7%25%95%33%17348m
23:004.6%46%100%94%17307m
Thu, Jul 9
24:006.4%56%88%14%9549m
01:003.7%57%48%79%5529m
02:001.9%69%77%96%358m
03:004%73%100%82%224m
04:006.8%76%66%93%201m
05:0080%82%100%14%160m
06:0062%80%95%3.8%144m
07:0065%86%82%2.6%106m
08:0060%84%78%4.8%120m
09:0089%75%56%6.7%3593m
10:0064%85%76%18%765m
11:0067%70%61%4.9%262m
12:0072%71%31%5.9%3406m
13:0074%65%13%5.8%7963m
14:0063%80%62%5.8%8080m
15:0096%46%48%5%16493m
16:0066%51%9.5%5%24135m
17:0076%53%5%5.5%24134m
18:0067%36%5%4.9%19506m
19:0073%41%5%5%20236m
20:0014%45%5%34%9546m
21:008%55%21%98%9401m
22:006.7%54%20%100%11646m
23:006.1%72%9.4%79%12955m
Fri, Jul 10
24:001.5%83%5%85%9361m
01:000.1%83%17%100%310m
02:001.3%90%14%100%142m
03:002.8%97%21%100%94m
04:007.4%98%48%100%72m
05:0060%99%35%100%57m
06:0065%99%30%100%52m
07:0064%99%21%95%48m
08:0043%99%7.6%100%44m
09:0044%98%8.9%100%46m
10:0035%97%6.8%100%50m
11:0035%97%5%100%59m
12:0037%95%5%100%69m
13:0038%93%5%85%106m
14:0050%83%5.5%36%176m
15:0062%80%14%73%5680m
16:0052%83%14%100%1126m
17:0038%85%5%100%9299m
18:0038%85%5%100%1252m
19:0038%64%5%100%395m
20:000%68%8.9%100%331m
21:000.1%77%29%100%187m
22:008.3%79%8.5%100%146m
23:009.5%80%24%95%127m
Sat, Jul 11
24:0012%83%7.5%100%110m
01:003.7%85%5%100%108m
02:000%58%5%67%8117m
03:000%31%5%35%16126m
04:000%4.5%5%2%24135m
05:0031%11%4.9%2%22554m
06:0040%17%4.9%2.1%20974m
07:0049%23%4.8%2.1%19393m
08:0099%36%10%15%20974m
09:0099%48%16%28%22554m
10:0095%61%21%41%24135m
11:0065%54%39%60%22030m
12:0041%46%57%78%19924m
13:0039%38%75%97%17819m
14:0039%30%80%98%19480m
15:0053%21%86%99%21141m
16:0053%13%92%100%22803m
17:0060%13%92%100%23247m
18:0060%14%92%100%23691m
19:0060%15%92%100%24135m
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
Asia/Bangkok
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
Wed, Jul 8 Sunrise 05:26 Sunset 18:52
21:00
862hPa 49% 84% 50% 99% -26° 84% 0.82m/s 0.31m/s
22:00
862hPa 33% 95% 43% 98% -35° 95% 0.81m/s 0.43m/s
23:00
863hPa 94% 100% 49% 99% -42° 100% 1.1m/s 0.66m/s
Thu, Jul 9 Sunrise 05:26 Sunset 18:52
24:00
862hPa 14% 88% 55% 99% -45° 93% 1.1m/s 0.51m/s
01:00
861hPa 79% 48% 61% 99% -44° 82% 1.1m/s 0.61m/s
02:00
861hPa 96% 77% 72% 99% -38° 99% 1.2m/s 0.64m/s
03:00
861hPa 82% 100% 83% 99% -29° 100% 1.2m/s 0.56m/s
04:00
861hPa 93% 66% 94% 99% -18° 100% 1m/s 0.62m/s
05:00
861hPa 14% 100% 96% 100% -6.4° 100% 1.1m/s 0.59m/s
06:00
861hPa 4% 95% 98% 99% 6.3° 96% 1.1m/s 0.56m/s
07:00
862hPa 3% 82% 100% 99% 19° 87% 1.2m/s 0.87m/s
08:00
862hPa 5% 78% 100% 98% 33° 92% 1.4m/s 1.1m/s
09:00
863hPa 7% 56% 100% 95% 46° 75% 1.4m/s 1.2m/s
10:00
862hPa 18% 76% 100% 96% 60° 85% 1.8m/s 1.6m/s
11:00
862hPa 5% 61% 100% 97% 74° 79% 1.9m/s 1.6m/s
12:00
862hPa 6% 30% 100% 95% 88° 71% 2.2m/s 1.9m/s
13:00
861hPa 6% 13% 100% 94% 78° 65% 2.5m/s 1.9m/s
14:00
860hPa 6% 62% 89% 92% 65° 80% 2.5m/s 1.9m/s
15:00
860hPa 5% 48% 78% 94% 51° 58% 2.3m/s 1.8m/s
16:00
860hPa 5% 10% 67% 90% 37° 50% 2.2m/s 1.7m/s
17:00
860hPa 6% 5% 68% 86% 24° 53% 2.3m/s 1.7m/s
18:00
860hPa 5% 5% 68% 92% 11° 36% 2.4m/s 1.5m/s
19:00
861hPa 5% 5% 68% 99% -2.2° 41% 1.7m/s 1.2m/s
20:00
861hPa 34% 5% 54% 99% -15° 52% 1.3m/s 0.79m/s
21:00
862hPa 98% 21% 40% 99% -26° 98% 1.4m/s 0.63m/s
22:00
862hPa 100% 20% 26% 99% -35° 100% 1.3m/s 0.67m/s
23:00
862hPa 79% 9% 26% 99% -42° 86% 1.3m/s 0.71m/s
Fri, Jul 10 Sunrise 05:27 Sunset 18:52
24:00
862hPa 85% 5% 27% 99% -45° 95% 1.3m/s 0.75m/s
01:00
861hPa 100% 17% 27% 100% -44° 100% 1.5m/s 0.96m/s
02:00
860hPa 100% 14% 27% 100% -38° 100% 1.7m/s 1m/s
03:00
860hPa 100% 21% 26% 100% -29° 100% 1.7m/s 1m/s
04:00
860hPa 100% 48% 26% 100% -18° 100% 1.8m/s 1.1m/s
05:00
860hPa 100% 35% 36% 100% -6.4° 100% 2m/s 1.1m/s
06:00
860hPa 100% 30% 46% 100% 6.3° 100% 1.9m/s 1.2m/s
07:00
861hPa 95% 20% 56% 99% 19° 100% 1.8m/s 1.2m/s
08:00
861hPa 100% 8% 64% 99% 33° 100% 1.9m/s 1.4m/s
09:00
861hPa 100% 9% 71% 99% 46° 100% 1.9m/s 1.4m/s
10:00
861hPa 100% 7% 79% 99% 60° 100% 2m/s 1.6m/s
11:00
861hPa 100% 5% 82% 98% 74° 100% 2m/s 1.6m/s
12:00
860hPa 100% 5% 85% 98% 88° 100% 1.9m/s 1.6m/s
13:00
860hPa 85% 5% 88% 97% 78° 95% 2.1m/s 1.6m/s
14:00
859hPa 36% 6% 75% 96% 65° 85% 2.3m/s 1.9m/s
15:00
859hPa 73% 14% 62% 95% 51° 87% 2.3m/s 2m/s
16:00
859hPa 100% 14% 49% 97% 37° 100% 2.3m/s 1.9m/s
17:00
859hPa 100% 5% 53% 98% 24° 100% 2.2m/s 1.7m/s
18:00
859hPa 100% 5% 57% 99% 11° 100% 2m/s 1.4m/s
19:00
860hPa 100% 5% 62% 100% -2.2° 100% 1.7m/s 1.1m/s
20:00
860hPa 100% 9% 54% 100% -15° 100% 1.4m/s 0.93m/s
21:00
861hPa 100% 29% 46% 100% -26° 100% 1.4m/s 0.76m/s
22:00
861hPa 100% 8% 38% 100% -35° 100% 1.5m/s 0.88m/s
23:00
861hPa 95% 24% 38% 100% -42° 97% 1.1m/s 0.58m/s
Sat, Jul 11 Sunrise 05:27 Sunset 18:52
24:00
860hPa 100% 8% 37% 100% -45° 100% 1.3m/s 0.75m/s
01:00
860hPa 100% 5% 37% 100% -44° 100% 1.4m/s 0.81m/s
02:00
889hPa 67% 5% 34% 86% -38° 69% 1.5m/s 0.85m/s
03:00
919hPa 35% 5% 31% 72% -29° 38% 1.5m/s 0.89m/s
04:00
949hPa 2% 5% 28% 58% -18° 7% 1.6m/s 0.93m/s
05:00
948hPa 2% 5% 46% 54% -6.5° 12% 1.6m/s 0.87m/s
06:00
946hPa 2% 5% 64% 51% 6.2° 17% 1.5m/s 0.81m/s
07:00
945hPa 2% 5% 82% 48% 19° 23% 1.4m/s 0.75m/s
08:00
945hPa 15% 10% 84% 49% 33° 37% 1.6m/s 1.1m/s
09:00
944hPa 28% 16% 86% 51% 46° 52% 1.7m/s 1.4m/s
10:00
944hPa 41% 21% 88% 53% 60° 67% 1.8m/s 1.8m/s
11:00
944hPa 60% 39% 91% 61% 74° 77% 1.7m/s 1.5m/s
12:00
945hPa 78% 57% 93% 69% 88° 87% 1.6m/s 1.2m/s
13:00
945hPa 97% 75% 96% 77% 78° 97% 1.4m/s 0.95m/s
14:00
946hPa 98% 80% 91% 83% 65° 98% 1.6m/s 1m/s
15:00
947hPa 99% 86% 86% 90% 51° 99% 1.8m/s 1.1m/s
16:00
948hPa 100% 92% 82% 97% 37° 100% 1.9m/s 1.3m/s
17:00
947hPa 100% 92% 86% 97% 24° 100% 1.7m/s 1.2m/s
18:00
947hPa 100% 92% 91% 97% 11° 100% 1.4m/s 1.1m/s
19:00
947hPa 100% 92% 96% 98% -2.3° 100% 1.1m/s 1m/s
20:00
946hPa 99% 86% 89% 97% -15° 100% 1.2m/s 0.99m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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