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Rule Cloudscapes

Hanoi - Cloudscapes - Vietnam

Hanoi, Hanoi, Vietnam

Multi-layered dramatic clouds for striking sky photography

Currently

Real-time conditions
Cloud Cover100%
Wind Gusts6.9m/s
Precipitation Chance80%
Air Pressure1000.1hPa

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Bangkok
cloudscapes weather icon
Next opportunity
Dramatic Cloud Drama
Hanoi
Tomorrow · 17:00–18:00 · 1h window
Medium confidence
57%
☁️Cloud Drama Score100%
Cloud Cover: 50%
Wind Gusts: 3.6m/s
Precipitation Chance: 80%
Air Pressure: 996.8hPa
cloudscapes weather icon
Dramatic Cloud Drama at Dusk
Hanoi
Tomorrow · 19:00–20:00
☁️Cloud Drama Score:86.5%
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
3matching 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
12:0030%36%0%98%24134m
13:0033%55%0%100%24135m
14:0053%47%1.1%62%24134m
15:0067%40%0.2%79%24135m
16:0079%64%0.2%56%24134m
17:0051%76%0.2%89%24134m
18:0051%93%0%87%22083m
19:0057%7.7%0%80%24134m
20:002.5%2.9%0%100%24134m
21:002.8%3.9%0%100%14983m
22:002.9%0.6%0%100%24135m
23:002.4%1.2%0%100%24135m
Thu, Jul 9
24:000.6%27%0%100%24135m
01:003.3%1.3%1.3%100%24134m
02:007.4%1.3%1.6%100%24134m
03:0010%14%0.3%100%24134m
04:0011%15%0%100%24135m
05:0034%0.1%1.9%100%15157m
06:0030%0%3.7%96%24134m
07:0042%0%4.5%82%24135m
08:0045%0.1%3.6%77%14966m
09:0041%0%2.6%73%24135m
10:0018%0.1%0.6%89%24134m
11:0047%1.6%0.9%46%24134m
12:0069%21%2.2%26%24134m
13:0064%17%2.8%53%24135m
14:0072%13%2.5%37%24135m
15:0093%38%3.9%28%24134m
16:0092%47%1.8%18%24135m
17:00100%45%3.2%47%24134m
18:00100%32%4.6%19%24135m
19:0087%31%3.5%80%24135m
20:0010%23%3.8%100%24134m
21:002.6%37%4.6%100%24135m
22:004.8%7.9%4.7%100%24135m
23:002.2%0%5%100%24134m
Fri, Jul 10
24:003.3%0%5%100%24135m
01:001.4%0%16%100%24135m
02:001.8%0%68%100%8865m
03:001%0%67%100%24135m
04:002.3%9.6%92%100%24135m
05:0058%51%70%100%24135m
06:0058%34%82%100%24135m
07:0061%18%97%100%24135m
08:0048%0.6%100%100%24135m
09:0054%0.3%100%100%24135m
10:0054%2.1%94%49%24134m
11:0044%4.6%69%91%24135m
12:0041%0.7%47%84%24134m
13:0059%17%62%73%24135m
14:0060%43%77%70%24134m
15:0057%62%90%86%24134m
16:0050%55%98%96%24135m
17:0055%77%92%100%24134m
18:0058%75%60%100%24134m
19:0055%84%42%100%24134m
20:002.4%99%91%100%24135m
21:009.9%68%6.8%83%24134m
22:007.8%56%48%83%24134m
23:007.6%63%82%97%24135m
Sat, Jul 11
24:000.7%79%53%96%24135m
01:004.4%57%5%100%24135m
02:000%52%5%68%24135m
03:000%47%5%37%24135m
04:000%42%5%5%24135m
05:0059%47%4.3%5%24135m
06:0059%52%3.5%5%24135m
07:0059%57%2.8%5%24135m
08:0058%63%2.2%8.1%24135m
09:0076%69%1.6%11%24135m
10:0054%75%1%14%24135m
11:0042%83%1.3%42%24135m
12:0026%91%1.5%69%24135m
13:0023%100%1.8%97%24135m
14:0025%85%2.5%97%24135m
15:0033%71%3.1%97%24135m
16:0033%56%3.8%97%24135m
17:0040%38%4.2%97%24135m
18:0038%19%4.6%98%24135m
19:0020%0%5%98%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 05:21 Sunset 18:41
21:00
1000hPa 100% 0% 80% 77% -28° 100% 6.9m/s 3.5m/s
22:00
1001hPa 100% 0% 71% 78% -37° 100% 5.7m/s 3m/s
23:00
1001hPa 100% 0% 77% 80% -44° 100% 5m/s 2.8m/s
Thu, Jul 9 Sunrise 05:21 Sunset 18:41
24:00
1000hPa 100% 0% 83% 82% -47° 100% 4.7m/s 2.6m/s
01:00
1000hPa 100% 1% 89% 82% -44° 100% 5.4m/s 2.8m/s
02:00
999hPa 100% 2% 85% 82% -38° 100% 4.4m/s 2.3m/s
03:00
999hPa 100% 0% 81% 82% -29° 100% 3.4m/s 2.1m/s
04:00
999hPa 100% 0% 77% 83% -17° 100% 2.4m/s 1.6m/s
05:00
999hPa 100% 2% 80% 84% -5.3° 100% 1.8m/s 1.3m/s
06:00
1000hPa 96% 4% 82% 84% 7.6° 96% 1.8m/s 1.3m/s
07:00
1001hPa 82% 4% 84% 79% 21° 82% 2.4m/s 1.8m/s
08:00
1001hPa 77% 4% 69% 72% 34° 77% 2.2m/s 1.9m/s
09:00
1001hPa 72% 3% 53% 65% 48° 72% 0.7m/s 0.99m/s
10:00
1001hPa 89% 1% 38% 58% 62° 89% 1m/s 0.21m/s
11:00
1001hPa 46% 1% 49% 53% 76° 46% 1.9m/s 1.1m/s
12:00
1000hPa 26% 2% 61% 50% 89° 31% 3.2m/s 2.2m/s
13:00
999hPa 53% 3% 73% 48% 76° 57% 3.9m/s 2.7m/s
14:00
998hPa 37% 2% 75% 47% 63° 40% 3.5m/s 2.2m/s
15:00
997hPa 28% 4% 77% 46% 49° 47% 3.5m/s 2m/s
16:00
997hPa 18% 2% 79% 46% 35° 47% 3m/s 1.3m/s
17:00
997hPa 47% 3% 80% 52% 22° 50% 3.6m/s 2.7m/s
18:00
997hPa 18% 5% 82% 65% 8.4° 32% 6.4m/s 4.3m/s
19:00
998hPa 80% 4% 84% 68% -4.5° 80% 7.7m/s 4.3m/s
20:00
999hPa 100% 4% 68% 70% -17° 100% 8.2m/s 4.4m/s
21:00
1000hPa 100% 5% 53% 71% -28° 100% 8.1m/s 4.3m/s
22:00
1000hPa 100% 5% 37% 74% -37° 100% 7.2m/s 4m/s
23:00
1000hPa 100% 5% 40% 77% -44° 100% 6.4m/s 3.4m/s
Fri, Jul 10 Sunrise 05:21 Sunset 18:41
24:00
999hPa 100% 5% 42% 80% -47° 100% 4.5m/s 2.5m/s
01:00
998hPa 100% 16% 45% 81% -44° 100% 2.4m/s 1.6m/s
02:00
998hPa 100% 68% 49% 85% -38° 100% 1.4m/s 1.2m/s
03:00
997hPa 100% 66% 53% 82% -29° 100% 1.1m/s 0.63m/s
04:00
998hPa 100% 92% 57% 82% -18° 100% 2.1m/s 1.4m/s
05:00
998hPa 100% 70% 62% 84% -5.4° 100% 3.1m/s 1.7m/s
06:00
999hPa 100% 82% 67% 84% 7.5° 100% 3.7m/s 2.1m/s
07:00
999hPa 100% 97% 71% 80% 21° 100% 4.2m/s 2.5m/s
08:00
1000hPa 100% 100% 81% 73% 34° 100% 3.9m/s 2.7m/s
09:00
1000hPa 100% 100% 90% 67% 48° 100% 3.5m/s 2.7m/s
10:00
999hPa 49% 94% 100% 60% 62° 94% 3m/s 2.6m/s
11:00
999hPa 91% 68% 71% 52% 76° 91% 2.9m/s 2.1m/s
12:00
998hPa 84% 47% 42% 48% 89° 89% 2.5m/s 1.6m/s
13:00
997hPa 73% 62% 13% 46% 76° 76% 2.5m/s 1.2m/s
14:00
996hPa 70% 77% 18% 44% 63° 78% 2.5m/s 0.74m/s
15:00
995hPa 86% 90% 23% 44% 49° 92% 3m/s 1.3m/s
16:00
995hPa 96% 98% 28% 45% 35° 99% 2.9m/s 1.5m/s
17:00
995hPa 100% 92% 31% 48% 22° 100% 2.2m/s 0.98m/s
18:00
995hPa 100% 60% 34% 55% 8.3° 100% 1.4m/s 1m/s
19:00
996hPa 100% 42% 37% 61% -4.6° 100% 3.1m/s 1.8m/s
20:00
997hPa 100% 91% 41% 65% -17° 100% 4.7m/s 3.1m/s
21:00
998hPa 83% 7% 46% 65% -28° 89% 5.2m/s 3.2m/s
22:00
998hPa 82% 48% 50% 67% -38° 82% 4.7m/s 2.7m/s
23:00
998hPa 97% 82% 46% 69% -44° 97% 2.8m/s 1.8m/s
Sat, Jul 11 Sunrise 05:22 Sunset 18:41
24:00
997hPa 96% 53% 41% 69% -47° 96% 1.1m/s 0.76m/s
01:00
997hPa 100% 5% 37% 70% -45° 100% 0.91m/s 0.52m/s
02:00
997hPa 68% 5% 39% 67% -38° 81% 1.6m/s 1.1m/s
03:00
998hPa 37% 5% 42% 65% -29° 61% 2.2m/s 1.8m/s
04:00
998hPa 5% 5% 44% 62% -18° 42% 2.9m/s 2.4m/s
05:00
997hPa 5% 4% 46% 57% -5.5° 47% 3.2m/s 2.8m/s
06:00
996hPa 5% 4% 49% 53% 7.4° 52% 3.5m/s 3.2m/s
07:00
995hPa 5% 3% 51% 48% 21° 56% 3.7m/s 3.6m/s
08:00
994hPa 8% 2% 51% 47% 34° 63% 3.2m/s 2.8m/s
09:00
994hPa 11% 2% 50% 47% 48° 69% 2.7m/s 1.9m/s
10:00
993hPa 14% 1% 50% 46% 62° 75% 2.2m/s 1.1m/s
11:00
994hPa 42% 1% 38% 54% 76° 83% 4.1m/s 2.2m/s
12:00
994hPa 69% 2% 27% 61% 89° 92% 6m/s 3.4m/s
13:00
995hPa 97% 2% 15% 69% 77° 100% 7.8m/s 4.5m/s
14:00
995hPa 97% 2% 22% 71% 63° 99% 6.8m/s 3.8m/s
15:00
996hPa 97% 3% 30% 73% 49° 98% 5.8m/s 3.1m/s
16:00
996hPa 97% 4% 37% 75% 35° 97% 4.8m/s 2.3m/s
17:00
996hPa 97% 4% 41% 77% 22° 97% 4.3m/s 2.3m/s
18:00
995hPa 98% 5% 45% 80% 8.3° 98% 3.7m/s 2.2m/s
19:00
995hPa 98% 5% 48% 82% -4.6° 98% 3.1m/s 2.1m/s
20:00
995hPa 65% 12% 39% 83% -17° 74% 2.6m/s 1.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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