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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 · ≥ 75.0%

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
Fog Probability
0%
Dewpoint Spread1.4°C
Visibility24113 (Clear)
Relative Humidity91%
Wind Speed0.4m/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 80 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Bangkok
Fog Probability
≥ 75.0%
Sun, May 24
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Mon, May 25
24:000%
01:000%
02:0053%
03:0029%
04:0029%
05:0030%
06:0029%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Tue, May 26
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Wed, May 27
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
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
Sun, May 24 Sunrise 05:21 Sunset 18:39
20:00 ☾
2% 20°C 0mm 91% 0cm -17° 21°C 0.38mm 0.22kPa 24113m 0.8m/s 0.41m/s
21:00 ☾
1% 20°C 0mm 92% 0cm -29° 21°C 0.44mm 0.2kPa 24135m 0.81m/s 0.54m/s
22:00 ☾
1% 20°C 0mm 93% 0cm -38° 21°C 0.56mm 0.16kPa 24134m 0.8m/s 0.43m/s
23:00 ☾
1% 19°C 0mm 94% 0cm -45° 20°C 0.63mm 0.15kPa 24134m 0.71m/s 0.42m/s
Mon, May 25 Sunrise 05:21 Sunset 18:39
24:00 ☾
1% 19°C 0mm 94% 0cm -47° 20°C 0.63mm 0.14kPa 24134m 1.4m/s 0.74m/s
01:00 ☾
1% 19°C 0mm 95% 0cm -45° 20°C 0.75mm 0.12kPa 24134m 1.4m/s 0.82m/s
02:00 ☾
6% 19°C 0mm 96% 0cm -38° 20°C 0.06mm 0.1kPa 24135m 1.4m/s 0.89m/s
03:00 ☾
11% 19°C 0mm 95% 0cm -29° 20°C 0.38mm 0.11kPa 18628m 2.1m/s 1.3m/s
04:00 ☾
16% 19°C 0.01mm 96% 0cm -18° 20°C 0.69mm 0.1kPa 23781m 1.9m/s 1.1m/s
05:00 ☾
14% 19°C 0mm 96% 0cm -5.3° 19°C 0.75mm 0.08kPa 22942m 1.6m/s 0.9m/s
06:00 ☾
12% 19°C 0mm 96% 0cm 7.6° 20°C 0.88mm 0.1kPa 24135m 2m/s 0.98m/s
07:00
10% 20°C 0.01mm 93% 0cm 21° 21°C 1.1mm 0.17kPa 19716m 3.1m/s 1.5m/s
08:00
7% 20°C 0mm 90% 0cm 34° 22°C 0.25mm 0.28kPa 20161m 2.9m/s 1.7m/s
09:00
5% 20°C 0mm 82% 0cm 48° 23°C 0.38mm 0.52kPa 19151m 2.9m/s 1.8m/s
10:00
2% 19°C 0mm 70% 0cm 62° 25°C 0.44mm 0.96kPa 23954m 3.3m/s 2.3m/s
11:00
2% 19°C 0mm 65% 0cm 76° 26°C 0.56mm 1.2kPa 24134m 3.8m/s 2.3m/s
12:00
1% 19°C 0mm 63% 0cm 89° 27°C 0.63mm 1.3kPa 24134m 4m/s 2.2m/s
13:00
1% 20°C 0mm 65% 0cm 76° 27°C 0.75mm 1.2kPa 23363m 3.7m/s 1.9m/s
14:00
21% 20°C 0mm 69% 0cm 62° 26°C 0.19mm 1.1kPa 22455m 3.7m/s 1.9m/s
15:00
40% 19°C 0mm 58% 0cm 48° 27°C 0.31mm 1.5kPa 24134m 4.4m/s 1.8m/s
16:00
60% 19°C 0mm 65% 0cm 35° 26°C 0.31mm 1.2kPa 24135m 3m/s 1.4m/s
17:00
65% 21°C 0mm 80% 0cm 21° 24°C 0.56mm 0.63kPa 14188m 2.6m/s 1.2m/s
18:00
71% 20°C 0mm 86% 0cm 7.9° 23°C 0.88mm 0.37kPa 22649m 1.3m/s 0.62m/s
19:00 ☾
76% 20°C 0mm 88% 0cm -5° 22°C 0.94mm 0.31kPa 24135m 0.8m/s 1m/s
20:00 ☾
81% 19°C 0mm 88% 0cm -17° 21°C 0.06mm 0.3kPa 24134m 0.82m/s 1m/s
21:00 ☾
87% 19°C 0mm 87% 0cm -29° 21°C 0.06mm 0.33kPa 24134m 0.83m/s 0.92m/s
22:00 ☾
92% 18°C 0mm 87% 0cm -38° 21°C 0.13mm 0.32kPa 24134m 0.81m/s 0.74m/s
23:00 ☾
89% 18°C 0mm 86% 0cm -45° 21°C 0.13mm 0.34kPa 24134m 0.91m/s 0.74m/s
Tue, May 26 Sunrise 05:21 Sunset 18:39
24:00 ☾
85% 19°C 0mm 87% 0cm -47° 21°C 0.19mm 0.31kPa 24135m 0.91m/s 0.83m/s
01:00 ☾
82% 19°C 0mm 89% 0cm -45° 20°C 0.25mm 0.26kPa 24134m 0.9m/s 0.81m/s
02:00 ☾
82% 19°C 0mm 90% 0cm -38° 20°C 0mm 0.24kPa 24135m 0.91m/s 0.83m/s
03:00 ☾
81% 19°C 0mm 90% 0cm -29° 21°C 0.06mm 0.25kPa 24134m 0.91m/s 0.85m/s
04:00 ☾
81% 18°C 0mm 92% 0cm -18° 20°C 0.06mm 0.19kPa 24135m 1m/s 1.1m/s
05:00 ☾
81% 18°C 0mm 92% 0cm -5.3° 19°C 0.06mm 0.17kPa 24134m 1m/s 0.95m/s
06:00 ☾
81% 18°C 0mm 92% 0cm 7.7° 20°C 0.06mm 0.19kPa 24134m 0.82m/s 0.82m/s
07:00
81% 20°C 0mm 85% 0cm 21° 22°C 0.06mm 0.4kPa 24135m 1.4m/s 0.75m/s
08:00
81% 20°C 0mm 77% 0cm 34° 24°C 0mm 0.68kPa 24134m 2.1m/s 1.4m/s
09:00
82% 19°C 0mm 67% 0cm 48° 26°C 0mm 1.1kPa 24135m 2.8m/s 1.9m/s
10:00
82% 19°C 0mm 62% 0cm 62° 27°C 0mm 1.4kPa 24134m 3.4m/s 2.3m/s
11:00
82% 19°C 0.01mm 58% 0cm 76° 28°C 0mm 1.6kPa 24134m 3.5m/s 2.3m/s
12:00
83% 19°C 0mm 54% 0cm 89° 29°C 0.06mm 1.8kPa 24134m 3.4m/s 2.1m/s
13:00
83% 18°C 0mm 53% 0cm 76° 29°C 0.06mm 1.9kPa 24135m 3.3m/s 1.7m/s
14:00
84% 19°C 0mm 56% 0cm 62° 28°C 0mm 1.7kPa 24134m 3.2m/s 1.5m/s
15:00
84% 20°C 0mm 64% 0cm 48° 27°C 0.06mm 1.3kPa 24135m 2.4m/s 1.1m/s
16:00
85% 19°C 0mm 60% 0cm 35° 28°C 0.06mm 1.5kPa 24134m 2.7m/s 0.92m/s
17:00
89% 20°C 0mm 68% 0cm 21° 27°C 0.06mm 1.1kPa 24135m 1.1m/s 0.62m/s
18:00
93% 20°C 0mm 76% 0cm 8° 25°C 0.06mm 0.74kPa 24134m 0.5m/s 0.21m/s
19:00 ☾
97% 19°C 0mm 78% 0cm -4.9° 23°C 0.06mm 0.63kPa 24134m 0.72m/s 0.87m/s
20:00 ☾
97% 18°C 0mm 76% 0cm -17° 23°C 0mm 0.65kPa 24134m 1.2m/s 1.4m/s
21:00 ☾
96% 18°C 0mm 79% 0cm -28° 22°C 0mm 0.56kPa 24135m 1.2m/s 1.5m/s
22:00 ☾
96% 18°C 0mm 78% 0cm -38° 22°C 0mm 0.57kPa 24135m 1.2m/s 1.6m/s
23:00 ☾
92% 17°C 0mm 77% 0cm -44° 22°C 0mm 0.58kPa 24134m 1.1m/s 1.5m/s
Wed, May 27 Sunrise 05:21 Sunset 18:40
24:00 ☾
89% 17°C 0mm 76% 0cm -47° 22°C 0mm 0.61kPa 24135m 1.1m/s 1.4m/s
01:00 ☾
85% 17°C 0mm 76% 0cm -45° 22°C 0mm 0.61kPa 24134m 1m/s 1.2m/s
02:00 ☾
70% 18°C 0mm 71% 0cm -38° 24°C 0.02mm 0.85kPa 21694m 1.5m/s 1.5m/s
03:00 ☾
54% 19°C 0mm 66% 0cm -29° 26°C 0.04mm 1.1kPa 19254m 2m/s 1.8m/s
04:00 ☾
39% 19°C 0mm 60% 0cm -17° 28°C 0.06mm 1.5kPa 16814m 2.5m/s 2.2m/s
05:00 ☾
42% 19°C 0.003mm 57% 0cm -5.2° 28°C 0.1mm 1.7kPa 19254m 2.6m/s 2.2m/s
06:00 ☾
46% 19°C 0.007mm 54% 0cm 7.7° 29°C 0.15mm 1.9kPa 21695m 2.6m/s 2.3m/s
07:00
49% 18°C 0.01mm 50% 0cm 21° 30°C 0.19mm 2.1kPa 24135m 2.7m/s 2.4m/s
08:00
61% 19°C 0.007mm 51% 0cm 34° 30°C 0.25mm 2kPa 24135m 2.6m/s 2.1m/s
09:00
72% 19°C 0.003mm 52% 0cm 48° 30°C 0.31mm 2kPa 24135m 2.5m/s 1.9m/s
10:00
84% 19°C 0mm 52% 0cm 62° 29°C 0.38mm 1.9kPa 24135m 2.4m/s 1.6m/s
11:00
80% 19°C 0mm 61% 0cm 76° 27°C 0.42mm 1.4kPa 24135m 1.9m/s 1.3m/s
12:00
75% 19°C 0mm 69% 0cm 89° 25°C 0.46mm 1kPa 24135m 1.4m/s 1m/s
13:00
71% 19°C 0mm 77% 0cm 76° 23°C 0.5mm 0.66kPa 24135m 0.94m/s 0.72m/s
14:00
57% 19°C 0.01mm 76% 0cm 62° 23°C 0.52mm 0.67kPa 24135m 1.1m/s 0.91m/s
15:00
43% 19°C 0.03mm 76% 0cm 49° 23°C 0.54mm 0.68kPa 24135m 1.2m/s 1.1m/s
16:00
29% 18°C 0.04mm 75% 0cm 35° 23°C 0.56mm 0.69kPa 24135m 1.3m/s 1.3m/s
17:00
32% 18°C 0.08mm 79% 0cm 21° 22°C 1.1mm 0.56kPa 24135m 1.2m/s 1.2m/s
18:00
35% 18°C 0.13mm 83% 0cm 8.1° 21°C 1.6mm 0.44kPa 24135m 1.2m/s 1m/s
19:00 ☾
38% 18°C 0.17mm 86% 0cm -4.8° 21°C 2.1mm 0.33kPa 24135m 1.1m/s 0.92m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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