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Rule Fog Hunter

Da Nang - Fog Hunter - Vietnam

Da Nang, Da Nang, 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
Dewpoint Spread3.7°C
Visibility24135 (Clear)
Relative Humidity80%
Wind Speed4.5m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Ho_Chi_Minh

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/Ho_Chi_Minh
Fog Probability
≥ 75.0%
Sat, May 23
20:000%
21:000%
22:000%
23:000%
Sun, May 24
24:000%
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Mon, May 25
24:000%
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Tue, May 26
24:000%
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Wed, May 27
24:000%
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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/Ho_Chi_Minh
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 05:15 Sunset 18:12
20:00
17% 24°C 0mm 80% 0cm -24° 28°C 0mm 0.73kPa 24135m 6.5m/s 4.5m/s
21:00
30% 24°C 0mm 84% 0cm -35° 27°C 0mm 0.56kPa 24135m 7.5m/s 5.3m/s
22:00
42% 24°C 0mm 84% 0cm -45° 26°C 0mm 0.55kPa 24134m 6.1m/s 4.5m/s
23:00
49% 23°C 0mm 84% 0cm -52° 26°C 0mm 0.56kPa 24134m 4.8m/s 3.8m/s
Mon, May 25 Sunrise 05:15 Sunset 18:12
24:00
57% 23°C 0mm 83% 0cm -53° 26°C 0mm 0.57kPa 24134m 3.6m/s 3.1m/s
01:00
64% 23°C 0mm 83% 0cm -49° 26°C 0mm 0.59kPa 24134m 3.4m/s 2.9m/s
02:00
72% 23°C 0mm 82% 0cm -40° 26°C 0mm 0.6kPa 24135m 3.1m/s 2.7m/s
03:00
81% 23°C 0mm 82% 0cm -29° 26°C 0mm 0.62kPa 24134m 3.7m/s 3.1m/s
04:00
89% 23°C 0mm 81% 0cm -17° 26°C 0mm 0.65kPa 24135m 4.1m/s 3.3m/s
05:00
90% 22°C 0mm 79% 0cm -4.1° 26°C 0mm 0.7kPa 24134m 5m/s 3.8m/s
06:00
92% 22°C 0mm 77% 0cm 9.4° 26°C 0mm 0.79kPa 24135m 5.1m/s 3.7m/s
07:00
93% 23°C 0mm 71% 0cm 23° 28°C 0mm 1.1kPa 24135m 5.8m/s 4.2m/s
08:00
93% 23°C 0mm 64% 0cm 37° 31°C 0mm 1.6kPa 24135m 5m/s 3.4m/s
09:00
94% 23°C 0mm 57% 0cm 51° 33°C 0mm 2.1kPa 24135m 5m/s 2.3m/s
10:00
94% 23°C 0mm 56% 0cm 65° 33°C 0mm 2.3kPa 24135m 4.5m/s 1.1m/s
11:00
92% 23°C 0mm 56% 0cm 78° 33°C 0mm 2.2kPa 24134m 3.9m/s 1.6m/s
12:00
91% 24°C 0mm 63% 0cm 84° 32°C 0mm 1.7kPa 24134m 4.1m/s 4.8m/s
13:00
89% 24°C 0mm 70% 0cm 71° 30°C 0mm 1.3kPa 24134m 6.9m/s 6.5m/s
14:00
63% 25°C 0mm 71% 0cm 57° 31°C 0mm 1.3kPa 24135m 6.5m/s 6m/s
15:00
38% 25°C 0mm 72% 0cm 43° 31°C 0mm 1.2kPa 24134m 4.1m/s 3.4m/s
16:00
12% 25°C 0mm 71% 0cm 30° 31°C 0.06mm 1.3kPa 24135m 5.5m/s 3.6m/s
17:00
11% 23°C 0mm 72% 0cm 16° 29°C 0.13mm 1.1kPa 6848m 3.7m/s 1.7m/s
18:00
9% 24°C 0mm 76% 0cm 2.4° 29°C 0.38mm 0.92kPa 24134m 6.2m/s 4.1m/s
19:00
8% 24°C 0mm 82% 0cm -11° 27°C 0.38mm 0.67kPa 24135m 5.3m/s 3.8m/s
20:00
17% 24°C 0mm 84% 0cm -24° 27°C 0mm 0.58kPa 24134m 5.1m/s 3.8m/s
21:00
25% 24°C 0mm 84% 0cm -35° 27°C 0mm 0.57kPa 24134m 5m/s 3.8m/s
22:00
34% 24°C 0mm 84% 0cm -45° 26°C 0mm 0.54kPa 24134m 5.3m/s 4.2m/s
23:00
38% 23°C 0mm 84% 0cm -51° 26°C 0mm 0.55kPa 24134m 5m/s 3.8m/s
Tue, May 26 Sunrise 05:15 Sunset 18:13
24:00
43% 23°C 0mm 83% 0cm -53° 26°C 0mm 0.59kPa 24135m 4.5m/s 3.5m/s
01:00
47% 23°C 0mm 82% 0cm -48° 26°C 0mm 0.61kPa 24134m 4.7m/s 3.7m/s
02:00
60% 23°C 0mm 82% 0cm -40° 26°C 0.06mm 0.59kPa 24135m 4.7m/s 3.6m/s
03:00
74% 23°C 0mm 82% 0cm -29° 26°C 0.25mm 0.62kPa 24134m 4.6m/s 3.4m/s
04:00
87% 23°C 0mm 80% 0cm -17° 26°C 0.25mm 0.7kPa 24135m 4.9m/s 3.5m/s
05:00
87% 22°C 0mm 78% 0cm -4° 26°C 0.25mm 0.75kPa 24134m 5m/s 3.6m/s
06:00
88% 22°C 0mm 77% 0cm 9.4° 27°C 0.25mm 0.82kPa 24134m 4.8m/s 3.4m/s
07:00
88% 23°C 0mm 70% 0cm 23° 29°C 0.25mm 1.2kPa 24135m 4.9m/s 3.4m/s
08:00
88% 23°C 0mm 62% 0cm 37° 31°C 0mm 1.7kPa 24134m 4.7m/s 2.8m/s
09:00
87% 23°C 0mm 57% 0cm 51° 33°C 0mm 2.1kPa 24135m 4.2m/s 1.8m/s
10:00
87% 23°C 0mm 56% 0cm 65° 33°C 0mm 2.2kPa 24134m 3.4m/s 1.4m/s
11:00
86% 23°C 0mm 59% 0cm 78° 32°C 0mm 1.9kPa 24134m 3m/s 3m/s
12:00
85% 23°C 0mm 63% 0cm 84° 31°C 0mm 1.6kPa 24134m 3.9m/s 4.7m/s
13:00
84% 23°C 0mm 65% 0cm 71° 31°C 0mm 1.5kPa 24135m 5.7m/s 5.3m/s
14:00
66% 24°C 0mm 68% 0cm 57° 31°C 0mm 1.4kPa 24134m 6.7m/s 6m/s
15:00
49% 25°C 0mm 74% 0cm 44° 31°C 0mm 1.2kPa 24135m 6.5m/s 5.7m/s
16:00
31% 26°C 0mm 77% 0cm 30° 30°C 0mm 1kPa 24134m 3.5m/s 2.5m/s
17:00
28% 25°C 0.01mm 74% 0cm 16° 30°C 0mm 1.1kPa 24135m 2.9m/s 2m/s
18:00
25% 24°C 0.01mm 74% 0cm 2.5° 29°C 0mm 1kPa 24134m 7.7m/s 5.3m/s
19:00
22% 23°C 0mm 82% 0cm -11° 26°C 0.63mm 0.59kPa 24134m 11m/s 6.7m/s
20:00
28% 22°C 0mm 85% 0cm -24° 24°C 0mm 0.47kPa 24134m 8.9m/s 5.8m/s
21:00
33% 22°C 0mm 83% 0cm -35° 25°C 0mm 0.51kPa 24135m 8.3m/s 5.4m/s
22:00
39% 22°C 0mm 86% 0cm -45° 25°C 0mm 0.45kPa 24135m 7.6m/s 5.1m/s
23:00
41% 23°C 0mm 85% 0cm -51° 25°C 0mm 0.47kPa 24134m 6.3m/s 4.6m/s
Wed, May 27 Sunrise 05:15 Sunset 18:13
24:00
43% 23°C 0mm 85% 0cm -53° 26°C 0mm 0.49kPa 24135m 6m/s 4.4m/s
01:00
45% 23°C 0mm 85% 0cm -48° 26°C 0mm 0.5kPa 24134m 5.7m/s 4.3m/s
02:00
49% 23°C 0mm 70% 0cm -40° 29°C 0mm 1.2kPa 24134m 4m/s 3.1m/s
03:00
54% 22°C 0mm 56% 0cm -29° 32°C 0mm 2.1kPa 24135m 2.4m/s 2m/s
04:00
58% 20°C 0mm 42% 0cm -17° 35°C 0mm 3.3kPa 24135m 0.7m/s 0.89m/s
05:00
58% 20°C 0mm 40% 0cm -4° 36°C 0mm 3.5kPa 24135m 1.6m/s 1.5m/s
06:00
58% 20°C 0mm 39% 0cm 9.4° 36°C 0mm 3.6kPa 24135m 2.4m/s 2.1m/s
07:00
58% 20°C 0mm 38% 0cm 23° 37°C 0mm 3.8kPa 24135m 3.3m/s 2.6m/s
08:00
57% 21°C 0mm 44% 0cm 37° 35°C 0.04mm 3.1kPa 24135m 2.9m/s 2.2m/s
09:00
57% 22°C 0mm 51% 0cm 51° 33°C 0.08mm 2.5kPa 24135m 2.5m/s 1.7m/s
10:00
56% 22°C 0mm 58% 0cm 65° 31°C 0.13mm 1.9kPa 24135m 2m/s 1.2m/s
11:00
53% 23°C 0.007mm 69% 0cm 78° 29°C 0.81mm 1.2kPa 24135m 1.9m/s 1.3m/s
12:00
50% 23°C 0.01mm 81% 0cm 84° 27°C 1.5mm 0.67kPa 24135m 1.8m/s 1.3m/s
13:00
47% 23°C 0.02mm 92% 0cm 71° 24°C 2.2mm 0.23kPa 24135m 1.7m/s 1.4m/s
14:00
41% 23°C 0.01mm 93% 0cm 58° 24°C 1.6mm 0.2kPa 24135m 2m/s 1.5m/s
15:00
35% 23°C 0.007mm 94% 0cm 44° 24°C 0.94mm 0.18kPa 24135m 2.3m/s 1.7m/s
16:00
29% 23°C 0mm 95% 0cm 30° 24°C 0.31mm 0.15kPa 24135m 2.5m/s 1.8m/s
17:00
28% 23°C 0mm 93% 0cm 16° 24°C 0.31mm 0.21kPa 24135m 2.3m/s 1.7m/s
18:00
27% 22°C 0mm 91% 0cm 2.5° 24°C 0.31mm 0.27kPa 24135m 2.2m/s 1.7m/s
19:00
26% 22°C 0mm 89% 0cm -11° 24°C 0.31mm 0.34kPa 24135m 2m/s 1.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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