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Rule Fog Hunter

Mu Cang Chai - Fog Hunter - Vietnam

Mù Cang Chải, Yên Bái Province, Vietnam

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Dewpoint Spread0.3°C
Visibility24135 (Clear)
Relative Humidity98%
Wind Speed0.5m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Bangkok
fog weather icon
Next opportunity
Dense Fog
Mu Cang Chai
Tomorrow · 02:00–05:00 · 3h window
High confidence
72%
🌫️Fog Probability82.2-100%
Dewpoint Spread: 0.1°C
Visibility: 2498 (Mist/Haze)
Relative Humidity: 99%
Wind Speed: 0.2m/s (calm conditions)
fog weather icon
Dense Fog at Sunrise
Mu Cang Chai
Tomorrow · 05:00–06:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Mu Cang Chai
Tomorrow · 06:00–07:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Mu Cang Chai
Fri, Jul 10 · 02:00–05:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog at Sunrise
Mu Cang Chai
Fri, Jul 10 · 05:00–06:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Mu Cang Chai
Fri, Jul 10 · 06:00–07:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Mu Cang Chai
Fri, Jul 10 · 20:00–02:00
🌫️Fog Probability:86-100%
High
+6 more windows in the next 10 days

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts when temperature inversions and morning mist create atmospheric conditions across Vietnam's mountain valleys, rice terraces, and karst landscapes. We track overnight cooling, humidity, topography, and seasonal patterns to identify when fog transforms Vietnam's highland regions into ethereal scenes.

Vietnam's dramatic elevation changes—from sea level to 10,000-foot peaks—create ideal conditions for fog formation in mountain valleys. Northern highlands around Sapa and Mu Cang Chai experience frequent morning fog, particularly during the transition between dry and wet seasons. Hill stations like Da Lat maintain cooler temperatures that promote mist formation even in tropical latitudes. The limestone karsts of Ha Long Bay and Ninh Binh develop ethereal fog conditions during cooler months.

What makes Vietnam fog photography special:

  • Terraced valleys - Sapa and Mu Cang Chai rice terraces emerge layer by layer as fog burns off, creating depth and mystery
  • Karst landscapes - Ha Long Bay limestone islands pierce through low-lying fog like ancient towers floating on clouds
  • Mountain village life - Traditional H'mong and Dao villages in Sapa appear and disappear through drifting mist during morning hours
  • Highland agriculture - Da Lat's flower farms and strawberry fields gain dreamlike quality under morning fog blankets

Sapa experiences its most reliable fog from September through November and March through May—transition seasons when temperature differentials are greatest. Early morning (5-8 AM) provides peak conditions as fog fills valleys while higher villages remain clear. Mu Cang Chai's deep valleys create spectacular inversions, especially during harvest season (late September) when golden rice terraces emerge through fog layers. Da Lat's elevation (1,500 meters) generates morning mist year-round, peaking December through March. Ninh Binh's karsts become most atmospheric during cooler months (November-February) when mist drifts through limestone formations. Arrive at viewpoints well before dawn—fog often dissipates quickly after sunrise.

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72-hour requirements breakdown

What passed or failed, hour by hour
16matching hours in the next 80 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Bangkok
Fog Probability
≥ 75.0%
Wed, Jul 8
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0073%
21:0073%
22:0073%
23:0073%
Thu, Jul 9
24:0041%
01:0042%
02:0082%
03:0091%
04:00100%
05:00100%
06:00100%
07:0059%
08:0031%
09:0031%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0073%
21:0041%
22:0041%
23:0041%
Fri, Jul 10
24:0041%
01:0046%
02:00100%
03:00100%
04:00100%
05:00100%
06:00100%
07:0060%
08:0069%
09:0053%
10:0052%
11:0048%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0086%
21:00100%
22:00100%
23:00100%
Sat, Jul 11
24:0089%
01:0089%
02:0067%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:0023%
14:0023%
15:0024%
16:0026%
17:0027%
18:0030%
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
Asia/Bangkok
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
Wed, Jul 8 Sunrise 05:26 Sunset 18:50
21:00
0% 19°C 0mm 98% 0cm -26° 20°C 0.19mm 0.04kPa 24135m 0.52m/s 0.51m/s
22:00
0% 19°C 0mm 98% 0cm -36° 19°C 0.19mm 0.04kPa 24135m 0.51m/s 0.29m/s
23:00
0% 19°C 0mm 98% 0cm -43° 19°C 0.19mm 0.03kPa 24135m 0.4m/s 0.32m/s
Thu, Jul 9 Sunrise 05:26 Sunset 18:50
24:00
0% 19°C 0mm 99% 0cm -46° 19°C 0.38mm 0.03kPa 18236m 0.5m/s 0.48m/s
01:00
0% 19°C 0mm 99% 0cm -44° 19°C 0.69mm 0.02kPa 17220m 0.41m/s 0.14m/s
02:00
0% 19°C 0mm 99% 0cm -38° 19°C 0.06mm 0.02kPa 11714m 0.4m/s 0.17m/s
03:00
0% 19°C 0mm 99% 0cm -29° 19°C 0.13mm 0.02kPa 7388m 0.53m/s 0.12m/s
04:00
0% 19°C 0mm 99% 0cm -18° 19°C 0.13mm 0.01kPa 2498m 0.61m/s 0.25m/s
05:00
0% 19°C 0mm 100% 0cm -6.4° 19°C 0.13mm 0.01kPa 635m 0.61m/s 0.09m/s
06:00
0% 19°C 0mm 99% 0cm 6.4° 19°C 0.13mm 0.01kPa 373m 0.81m/s 0.06m/s
07:00
0% 20°C 0mm 98% 0cm 19° 20°C 0.25mm 0.04kPa 330m 0.61m/s 0.38m/s
08:00
0% 20°C 0mm 98% 0cm 33° 20°C 0.25mm 0.06kPa 21623m 1.2m/s 0.91m/s
09:00
0% 20°C 0mm 97% 0cm 46° 20°C 0.5mm 0.07kPa 20632m 1.4m/s 1.1m/s
10:00
0% 20°C 0mm 92% 0cm 60° 22°C 0.81mm 0.2kPa 14170m 1.5m/s 1.5m/s
11:00
0% 20°C 0mm 83% 0cm 74° 23°C 1.3mm 0.48kPa 14663m 1.9m/s 2m/s
12:00
0% 21°C 0mm 88% 0cm 88° 23°C 2.3mm 0.35kPa 7216m 2.2m/s 1.8m/s
13:00
0% 22°C 0mm 92% 0cm 78° 23°C 3.5mm 0.23kPa 5978m 2m/s 1.6m/s
14:00
0% 22°C 0mm 94% 0cm 64° 23°C 1.6mm 0.17kPa 7037m 2m/s 1.6m/s
15:00
0% 22°C 0mm 97% 0cm 51° 22°C 3.3mm 0.09kPa 7336m 2m/s 1.4m/s
16:00
0% 21°C 0mm 97% 0cm 37° 22°C 4.5mm 0.08kPa 8574m 1.7m/s 1.1m/s
17:00
0% 21°C 0mm 96% 0cm 23° 22°C 5.3mm 0.1kPa 16908m 1.6m/s 1m/s
18:00
0% 21°C 0mm 98% 0cm 10° 21°C 5.6mm 0.06kPa 11261m 1.5m/s 0.92m/s
19:00
0% 20°C 0mm 99% 0cm -2.7° 20°C 5.9mm 0.03kPa 15924m 0.91m/s 0.68m/s
20:00
3% 19°C 0mm 99% 0cm -15° 19°C 0.19mm 0.03kPa 24134m 0.82m/s 0.5m/s
21:00
7% 19°C 0mm 99% 0cm -26° 19°C 0.31mm 0.03kPa 21978m 0.82m/s 0.47m/s
22:00
10% 19°C 0mm 99% 0cm -36° 19°C 0.38mm 0.03kPa 22544m 0.82m/s 0.41m/s
23:00
9% 18°C 0mm 99% 0cm -43° 19°C 0.44mm 0.03kPa 23010m 0.7m/s 0.45m/s
Fri, Jul 10 Sunrise 05:27 Sunset 18:50
24:00
9% 18°C 0mm 99% 0cm -46° 18°C 0.44mm 0.03kPa 24135m 0.61m/s 0.36m/s
01:00
8% 18°C 0mm 99% 0cm -44° 19°C 0.5mm 0.02kPa 11653m 0.5m/s 0.14m/s
02:00
6% 19°C 0mm 99% 0cm -38° 19°C 0mm 0.01kPa 1822m 0.72m/s 0.41m/s
03:00
3% 19°C 0mm 100% 0cm -29° 19°C 0.06mm 0.01kPa 653m 0.81m/s 0.26m/s
04:00
1% 19°C 0mm 100% 0cm -18° 19°C 0.06mm 0.01kPa 358m 0.9m/s 0.38m/s
05:00
1% 19°C 0mm 100% 0cm -6.5° 19°C 0.13mm 0.01kPa 392m 1.2m/s 0.54m/s
06:00
0% 19°C 0mm 100% 0cm 6.3° 19°C 0.19mm 0.01kPa 403m 1m/s 0.54m/s
07:00
0% 19°C 0mm 99% 0cm 19° 19°C 0.25mm 0.02kPa 362m 1.3m/s 0.76m/s
08:00
0% 19°C 0mm 99% 0cm 33° 19°C 0.13mm 0.02kPa 489m 1.8m/s 1.2m/s
09:00
0% 19°C 0mm 99% 0cm 46° 19°C 0.25mm 0.03kPa 357m 1.7m/s 1.1m/s
10:00
0% 19°C 0mm 98% 0cm 60° 20°C 0.38mm 0.03kPa 514m 1.5m/s 1m/s
11:00
0% 19°C 0mm 98% 0cm 74° 20°C 0.5mm 0.05kPa 1124m 1.5m/s 0.98m/s
12:00
0% 19°C 0mm 93% 0cm 88° 20°C 0.56mm 0.17kPa 1291m 1.8m/s 1.4m/s
13:00
0% 19°C 0.01mm 91% 0cm 78° 21°C 0.81mm 0.22kPa 5311m 1.9m/s 1.5m/s
14:00
2% 19°C 0mm 91% 0cm 64° 21°C 0.31mm 0.21kPa 787m 2m/s 1.4m/s
15:00
5% 20°C 0mm 87% 0cm 51° 22°C 0.56mm 0.33kPa 951m 2.4m/s 1.8m/s
16:00
7% 19°C 0mm 90% 0cm 37° 21°C 0.88mm 0.26kPa 1475m 2.3m/s 1.7m/s
17:00
8% 20°C 0mm 95% 0cm 23° 20°C 1.1mm 0.11kPa 2196m 2.1m/s 1.3m/s
18:00
8% 19°C 0mm 97% 0cm 10° 20°C 1.1mm 0.07kPa 2186m 1.5m/s 0.86m/s
19:00
9% 19°C 0mm 98% 0cm -2.7° 19°C 1.1mm 0.04kPa 2656m 0.72m/s 0.24m/s
20:00
8% 18°C 0mm 98% 0cm -15° 19°C 0mm 0.04kPa 3522m 0.64m/s 0.31m/s
21:00
6% 18°C 0mm 99% 0cm -26° 18°C 0mm 0.02kPa 1655m 0.71m/s 0.27m/s
22:00
5% 18°C 0mm 99% 0cm -36° 18°C 0mm 0.02kPa 1141m 0.71m/s 0.07m/s
23:00
4% 18°C 0mm 99% 0cm -43° 18°C 0mm 0.01kPa 1324m 0.6m/s 0.22m/s
Sat, Jul 11 Sunrise 05:27 Sunset 18:50
24:00
2% 18°C 0mm 99% 0cm -46° 18°C 0mm 0.02kPa 3137m 0.73m/s 0.14m/s
01:00
1% 18°C 0mm 98% 0cm -44° 18°C 0mm 0.04kPa 4393m 0.61m/s 0.19m/s
02:00
1% 18°C 0mm 96% 0cm -38° 19°C 0.02mm 0.08kPa 3013m 1.2m/s 0.72m/s
03:00
2% 19°C 0mm 94% 0cm -29° 20°C 0.04mm 0.13kPa 1633m 1.7m/s 1.2m/s
04:00
2% 19°C 0mm 92% 0cm -19° 20°C 0.06mm 0.18kPa 253m 2.3m/s 1.8m/s
05:00
2% 19°C 0.007mm 88% 0cm -6.6° 21°C 0.15mm 0.3kPa 6966m 2.4m/s 2m/s
06:00
1% 19°C 0.01mm 84% 0cm 6.2° 22°C 0.23mm 0.43kPa 13679m 2.5m/s 2.2m/s
07:00
1% 19°C 0.02mm 80% 0cm 19° 23°C 0.31mm 0.57kPa 20392m 2.6m/s 2.4m/s
08:00
3% 19°C 0.02mm 78% 0cm 33° 23°C 0.31mm 0.63kPa 21639m 2.7m/s 2.4m/s
09:00
4% 19°C 0.03mm 76% 0cm 46° 24°C 0.31mm 0.69kPa 22887m 2.7m/s 2.4m/s
10:00
6% 19°C 0.03mm 75% 0cm 60° 24°C 0.31mm 0.76kPa 24135m 2.7m/s 2.4m/s
11:00
4% 20°C 0.02mm 82% 0cm 74° 23°C 0.35mm 0.51kPa 24135m 2.4m/s 2m/s
12:00
3% 20°C 0.02mm 88% 0cm 88° 22°C 0.4mm 0.29kPa 24135m 2.1m/s 1.7m/s
13:00
1% 20°C 0.01mm 95% 0cm 78° 20°C 0.44mm 0.11kPa 24135m 1.7m/s 1.4m/s
14:00
11% 19°C 0.007mm 96% 0cm 64° 20°C 0.42mm 0.09kPa 24135m 1.6m/s 1.2m/s
15:00
22% 19°C 0.003mm 96% 0cm 51° 19°C 0.4mm 0.08kPa 24135m 1.5m/s 1.1m/s
16:00
32% 19°C 0mm 97% 0cm 37° 19°C 0.38mm 0.07kPa 24135m 1.4m/s 0.92m/s
17:00
30% 19°C 0mm 97% 0cm 23° 19°C 0.54mm 0.07kPa 22918m 1.5m/s 1m/s
18:00
27% 19°C 0mm 97% 0cm 10° 19°C 0.71mm 0.07kPa 21701m 1.6m/s 1.1m/s
19:00
25% 19°C 0mm 97% 0cm -2.7° 19°C 0.88mm 0.07kPa 20484m 1.6m/s 1.2m/s
20:00
21% 19°C 0.007mm 97% 0cm -15° 19°C 0.58mm 0.06kPa 13882m 1.8m/s 1.3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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