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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

No opportunities right now
Here’s what usually blocks matches

No Fog Hunter opportunities in the next 14 days

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Rule requirements (key thresholds)
Fog Probability · ≥ 60.0%

Tip: Scroll down to the 72-hour table to see exactly which condition fails hour by hour.

Most common blockers (next 72 hours)
Fog Probability 100% failing

Currently

Real-time conditions
Dewpoint Spread21.2°C
Visibility24135 (Clear)
Relative Humidity26%
Wind Speed2.4m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Bangkok

No opportunities in the next 10 days

See the blocker timeline below to understand which conditions are preventing matches.

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
0matching hours in the next 95 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Bangkok
Fog Probability
≥ 60.0%
Wed, Apr 8
08:000%
09:000%
10:000%
11:000%
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Thu, Apr 9
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Fri, Apr 10
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Sat, Apr 11
24:000%
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Sun, Apr 12
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
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
Thu, Apr 9 Sunrise 05:48 Sunset 18:21
09:00
84% 6.6°C 0mm 26% 0cm 43° 28°C 0mm 2.8kPa 24135m 5.7m/s 2.4m/s
10:00
93% 7.5°C 0mm 25% 0cm 57° 29°C 0mm 3kPa 24135m 8.8m/s 2.9m/s
11:00
95% 8.2°C 0mm 25% 0cm 69° 31°C 0mm 3.3kPa 24135m 9.3m/s 3.3m/s
12:00
97% 7.9°C 0mm 23% 0cm 76° 32°C 0mm 3.6kPa 24134m 9.8m/s 2.8m/s
13:00
99% 6.3°C 0mm 19% 0cm 71° 33°C 0mm 4kPa 24134m 10m/s 4.8m/s
14:00
92% 5.6°C 0mm 18% 0cm 59° 33°C 0mm 4.1kPa 24134m 10m/s 4.4m/s
15:00
84% 4.9°C 0mm 17% 0cm 46° 33°C 0mm 4.2kPa 24135m 12m/s 4.6m/s
16:00
77% 4.6°C 0mm 18% 0cm 32° 32°C 0mm 4kPa 24134m 11m/s 4.2m/s
17:00
69% 4.6°C 0mm 18% 0cm 18° 32°C 0mm 3.9kPa 24135m 11m/s 3.5m/s
18:00
61% 6.1°C 0mm 26% 0cm 4.2° 28°C 0mm 2.8kPa 24135m 1m/s 0.9m/s
19:00
53% 5.4°C 0mm 28% 0cm -9.6° 25°C 0mm 2.3kPa 24135m 1.1m/s 1.5m/s
20:00
58% 5.1°C 0mm 27% 0cm -23° 25°C 0mm 2.4kPa 24135m 0.73m/s 0.57m/s
21:00
62% 4.9°C 0mm 27% 0cm -36° 25°C 0mm 2.3kPa 24134m 0.71m/s 0.88m/s
22:00
67% 5.1°C 0mm 30% 0cm -47° 24°C 0mm 2kPa 24135m 1.1m/s 1.3m/s
23:00
75% 5.5°C 0mm 32% 0cm -56° 23°C 0mm 1.9kPa 24134m 1.1m/s 1.3m/s
Fri, Apr 10 Sunrise 05:48 Sunset 18:21
24:00
83% 5.7°C 0mm 34% 0cm -60° 23°C 0mm 1.8kPa 24134m 1m/s 1.3m/s
01:00
91% 6°C 0mm 35% 0cm -57° 22°C 0mm 1.8kPa 24135m 1.2m/s 1.4m/s
02:00
93% 6°C 0mm 36% 0cm -49° 22°C 0mm 1.6kPa 24135m 1.2m/s 1.4m/s
03:00
96% 6.1°C 0mm 34% 0cm -38° 23°C 0mm 1.8kPa 24134m 0.9m/s 0.89m/s
04:00
98% 5.9°C 0mm 39% 0cm -25° 20°C 0mm 1.5kPa 24134m 1m/s 1.2m/s
05:00
96% 5.8°C 0mm 40% 0cm -12° 20°C 0mm 1.4kPa 24135m 0.91m/s 1.1m/s
06:00
93% 5.9°C 0mm 41% 0cm 2.1° 19°C 0mm 1.3kPa 24134m 1m/s 1.2m/s
07:00
91% 7.3°C 0mm 38% 0cm 16° 23°C 0mm 1.7kPa 24135m 1.3m/s 0.86m/s
08:00
94% 7.4°C 0mm 30% 0cm 30° 26°C 0mm 2.4kPa 24134m 4.2m/s 1.8m/s
09:00
96% 8°C 0mm 28% 0cm 43° 28°C 0mm 2.7kPa 24134m 8.9m/s 2.7m/s
10:00
99% 8°C 0mm 26% 0cm 57° 29°C 0mm 3kPa 24135m 11m/s 3.3m/s
11:00
99% 7.6°C 0mm 24% 0cm 69° 31°C 0mm 3.4kPa 24134m 11m/s 3.4m/s
12:00
99% 5.5°C 0mm 19% 0cm 76° 32°C 0mm 3.9kPa 24134m 11m/s 4.6m/s
13:00
99% 4.4°C 0mm 17% 0cm 71° 33°C 0mm 4.1kPa 24135m 10m/s 4.7m/s
14:00
70% 4.7°C 0mm 17% 0cm 59° 33°C 0mm 4.1kPa 24134m 10m/s 5m/s
15:00
41% 4.1°C 0mm 17% 0cm 46° 33°C 0mm 4.1kPa 24134m 10m/s 4.2m/s
16:00
12% 4.2°C 0mm 17% 0cm 32° 32°C 0mm 3.9kPa 24135m 9.1m/s 4.5m/s
17:00
10% 4°C 0mm 18% 0cm 18° 31°C 0mm 3.8kPa 24135m 9.4m/s 4.3m/s
18:00
9% 3.9°C 0mm 19% 0cm 4.3° 30°C 0mm 3.4kPa 24134m 9.6m/s 3.7m/s
19:00
7% 3.8°C 0mm 24% 0cm -9.6° 26°C 0mm 2.6kPa 24134m 8.6m/s 1.8m/s
20:00
16% 4°C 0mm 24% 0cm -23° 26°C 0mm 2.6kPa 24134m 5.4m/s 1.1m/s
21:00
26% 4.1°C 0mm 27% 0cm -36° 25°C 0mm 2.3kPa 24134m 0.6m/s 0.61m/s
22:00
35% 4.4°C 0mm 30% 0cm -47° 23°C 0mm 2kPa 24134m 1m/s 1.4m/s
23:00
34% 4.9°C 0mm 32% 0cm -56° 23°C 0mm 1.9kPa 24134m 1.3m/s 1.6m/s
Sat, Apr 11 Sunrise 05:48 Sunset 18:21
24:00
33% 5.4°C 0mm 32% 0cm -60° 23°C 0mm 1.9kPa 24135m 1.1m/s 1.3m/s
01:00
32% 5.8°C 0mm 32% 0cm -57° 24°C 0mm 2kPa 24135m 0.42m/s 0.35m/s
02:00
26% 5.7°C 0mm 36% 0cm -49° 22°C 0mm 1.6kPa 24135m 0.52m/s 0.4m/s
03:00
19% 5.9°C 0mm 36% 0cm -38° 22°C 0mm 1.6kPa 24134m 1m/s 0.91m/s
04:00
13% 6.6°C 0mm 37% 0cm -25° 22°C 0mm 1.7kPa 24135m 1.9m/s 0.57m/s
05:00
13% 7.5°C 0mm 40% 0cm -12° 22°C 0mm 1.6kPa 24134m 3.9m/s 0.89m/s
06:00
13% 7.8°C 0mm 42% 0cm 2.2° 21°C 0mm 1.4kPa 24135m 2m/s 1m/s
07:00
13% 8.8°C 0mm 41% 0cm 16° 23°C 0mm 1.6kPa 24134m 3.8m/s 1.4m/s
08:00
34% 6.3°C 0mm 30% 0cm 30° 25°C 0mm 2.2kPa 24134m 7.1m/s 2.5m/s
09:00
54% 5°C 0mm 25% 0cm 44° 27°C 0mm 2.6kPa 24134m 8.8m/s 2.7m/s
10:00
75% 4.7°C 0mm 22% 0cm 57° 28°C 0mm 3kPa 24135m 12m/s 3.2m/s
11:00
74% 4.8°C 0mm 20% 0cm 69° 30°C 0mm 3.4kPa 24135m 14m/s 3.9m/s
12:00
73% 4.6°C 0mm 19% 0cm 76° 31°C 0mm 3.7kPa 24135m 12m/s 4.8m/s
13:00
72% 4.7°C 0mm 18% 0cm 71° 32°C 0mm 3.8kPa 24135m 12m/s 5.1m/s
14:00
69% 5.2°C 0mm 21% 0cm 59° 30°C 0mm 3.4kPa 24135m 12m/s 4.9m/s
15:00
66% 5.5°C 0mm 23% 0cm 46° 29°C 0mm 3kPa 24135m 12m/s 4.7m/s
16:00
63% 5.7°C 0mm 25% 0cm 32° 27°C 0mm 2.7kPa 24135m 13m/s 4.4m/s
17:00
64% 6.2°C 0mm 29% 0cm 18° 25°C 0mm 2.3kPa 24135m 9m/s 3.3m/s
18:00
65% 6.3°C 0mm 33% 0cm 4.4° 23°C 0mm 1.9kPa 24135m 5.2m/s 2.2m/s
19:00
66% 6.3°C 0mm 37% 0cm -9.5° 21°C 0mm 1.6kPa 24135m 1.4m/s 1.1m/s
20:00
70% 6.3°C 0mm 39% 0cm -23° 21°C 0mm 1.5kPa 24135m 1.4m/s 1.2m/s
21:00
75% 6.3°C 0mm 40% 0cm -36° 20°C 0mm 1.4kPa 24135m 1.4m/s 1.3m/s
22:00
79% 6.3°C 0mm 41% 0cm -47° 20°C 0mm 1.4kPa 24135m 1.4m/s 1.4m/s
23:00
83% 6.8°C 0mm 41% 0cm -56° 20°C 0mm 1.4kPa 24135m 2.1m/s 1.5m/s
Sun, Apr 12 Sunrise 05:47 Sunset 18:21
24:00
86% 7.3°C 0mm 41% 0cm -60° 21°C 0mm 1.5kPa 24135m 2.7m/s 1.7m/s
01:00
90% 7.8°C 0mm 41% 0cm -57° 22°C 0mm 1.5kPa 24135m 3.3m/s 1.9m/s
02:00
92% 7.1°C 0mm 34% 0cm -48° 24°C 0mm 2kPa 24135m 5.9m/s 2.5m/s
03:00
93% 5.6°C 0mm 27% 0cm -37° 26°C 0mm 2.5kPa 24135m 8.6m/s 3.1m/s
04:00
95% 2.9°C 0mm 19% 0cm -25° 29°C 0mm 3.2kPa 24135m 11m/s 3.8m/s
05:00
96% 3°C 0mm 18% 0cm -11° 30°C 0mm 3.5kPa 24135m 11m/s 4.5m/s
06:00
96% 2.9°C 0mm 17% 0cm 2.4° 31°C 0mm 3.8kPa 24135m 11m/s 5.1m/s
07:00
97% 2.8°C 0mm 15% 0cm 16° 32°C 0mm 4.1kPa 24135m 11m/s 5.8m/s
08:00
98% 2.8°C 0mm 15% 0cm 30° 33°C 0mm 4.1kPa 24135m 11m/s 5.4m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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