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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
Visibility19215 (Clear)
Relative Humidity80%
Wind Speed4.3m/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%
Sun, May 17
15:000%
16:000%
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Mon, May 18
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Tue, May 19
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Wed, May 20
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Thu, May 21
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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
Mon, May 18 Sunrise 05:16 Sunset 18:10
15:00
1% 24°C 0mm 80% 0cm 43° 28°C 1.4mm 0.74kPa 19215m 5.5m/s 4.3m/s
16:00
1% 25°C 0mm 81% 0cm 29° 28°C 1.4mm 0.73kPa 24135m 3.7m/s 2.9m/s
17:00
1% 25°C 0mm 80% 0cm 15° 28°C 1.5mm 0.75kPa 23730m 2.3m/s 1.9m/s
18:00
0% 24°C 0mm 83% 0cm 1.9° 28°C 1.6mm 0.63kPa 24135m 1.7m/s 1.6m/s
19:00
0% 24°C 0mm 85% 0cm -12° 27°C 1.6mm 0.55kPa 24134m 1.6m/s 1.6m/s
20:00
0% 24°C 0mm 85% 0cm -24° 27°C 0mm 0.53kPa 24134m 2.3m/s 2.3m/s
21:00
0% 24°C 0mm 85% 0cm -36° 27°C 0.25mm 0.52kPa 19204m 2.3m/s 1.8m/s
22:00
0% 24°C 0mm 87% 0cm -46° 26°C 0.5mm 0.45kPa 19535m 3.3m/s 2.8m/s
23:00
0% 24°C 0mm 88% 0cm -53° 26°C 0.94mm 0.41kPa 19603m 3.9m/s 3.3m/s
Tue, May 19 Sunrise 05:16 Sunset 18:10
24:00
0% 24°C 0mm 89% 0cm -54° 25°C 1.6mm 0.35kPa 19911m 4.1m/s 3.4m/s
01:00
0% 24°C 0.34mm 91% 0cm -50° 25°C 2.5mm 0.28kPa 11395m 4.2m/s 3.5m/s
02:00
0% 24°C 0.52mm 91% 0cm -41° 25°C 0.94mm 0.3kPa 14446m 3.2m/s 2.9m/s
03:00
0% 23°C 0.23mm 89% 0cm -30° 25°C 1.6mm 0.36kPa 21423m 2.9m/s 2.6m/s
04:00
0% 23°C 0.01mm 88% 0cm -18° 25°C 1.8mm 0.38kPa 24135m 3.3m/s 2.9m/s
05:00
0% 23°C 0mm 88% 0cm -4.4° 25°C 1.8mm 0.4kPa 24134m 3.8m/s 3.4m/s
06:00
0% 23°C 0mm 88% 0cm 9.2° 26°C 1.8mm 0.4kPa 24134m 4.3m/s 3.6m/s
07:00
0% 24°C 0mm 86% 0cm 23° 26°C 1.8mm 0.47kPa 24134m 3.9m/s 3m/s
08:00
0% 24°C 0mm 83% 0cm 37° 27°C 0mm 0.62kPa 24134m 3.9m/s 3.1m/s
09:00
0% 24°C 0mm 82% 0cm 51° 27°C 0mm 0.65kPa 24134m 3.6m/s 2.7m/s
10:00
0% 23°C 0mm 77% 0cm 65° 28°C 0mm 0.86kPa 24134m 2.4m/s 1.9m/s
11:00
0% 23°C 0mm 65% 0cm 79° 30°C 0mm 1.5kPa 24134m 2.1m/s 2.3m/s
12:00
0% 23°C 0mm 69% 0cm 85° 30°C 0mm 1.3kPa 24134m 2.6m/s 4.3m/s
13:00
0% 24°C 0mm 73% 0cm 71° 29°C 0.06mm 1.1kPa 24134m 4.7m/s 6.1m/s
14:00
2% 24°C 0mm 75% 0cm 57° 29°C 0mm 1kPa 24134m 5.3m/s 5.8m/s
15:00
5% 24°C 0mm 76% 0cm 43° 29°C 0.06mm 0.94kPa 24135m 5.3m/s 5.2m/s
16:00
7% 24°C 0mm 77% 0cm 29° 29°C 0.06mm 0.88kPa 24135m 5.1m/s 3.7m/s
17:00
5% 24°C 0mm 77% 0cm 15° 29°C 0.31mm 0.91kPa 24135m 6m/s 4.7m/s
18:00
3% 24°C 0.02mm 84% 0cm 27°C 0.5mm 0.59kPa 23780m 5.4m/s 4.5m/s
19:00
1% 24°C 1.9mm 87% 0cm -12° 27°C 1.9mm 0.44kPa 22558m 2.5m/s 1.3m/s
20:00
1% 24°C 0.04mm 89% 0cm -24° 26°C 0.56mm 0.38kPa 24134m 2.2m/s 1.3m/s
21:00
0% 24°C 0mm 88% 0cm -36° 26°C 0.56mm 0.4kPa 24134m 2.4m/s 1.8m/s
22:00
0% 24°C 0mm 88% 0cm -46° 26°C 0.56mm 0.4kPa 24134m 2.5m/s 2.2m/s
23:00
0% 24°C 0mm 86% 0cm -52° 26°C 0.56mm 0.47kPa 24135m 2.7m/s 2.3m/s
Wed, May 20 Sunrise 05:16 Sunset 18:10
24:00
0% 24°C 0mm 84% 0cm -54° 26°C 0.56mm 0.54kPa 24134m 2.9m/s 2.2m/s
01:00
0% 24°C 0mm 84% 0cm -49° 27°C 0.56mm 0.56kPa 24135m 4m/s 2.9m/s
02:00
0% 24°C 0mm 84% 0cm -41° 26°C 0mm 0.57kPa 24134m 4.3m/s 3.2m/s
03:00
1% 23°C 0mm 83% 0cm -30° 27°C 0mm 0.59kPa 24134m 4m/s 2.9m/s
04:00
1% 23°C 0mm 82% 0cm -17° 27°C 0mm 0.63kPa 24135m 3.1m/s 2.1m/s
05:00
1% 23°C 0mm 81% 0cm -4.3° 27°C 0mm 0.65kPa 24135m 1.3m/s 0.83m/s
06:00
1% 23°C 0mm 81% 0cm 9.2° 27°C 0mm 0.69kPa 24134m 0.93m/s 0.74m/s
07:00
1% 24°C 0mm 79% 0cm 23° 27°C 0mm 0.76kPa 24134m 1.4m/s 1.1m/s
08:00
1% 24°C 0mm 79% 0cm 37° 28°C 0mm 0.79kPa 24135m 1.7m/s 1.4m/s
09:00
0% 24°C 0mm 79% 0cm 51° 28°C 0mm 0.81kPa 24135m 1.3m/s 0.94m/s
10:00
0% 24°C 0mm 78% 0cm 65° 28°C 0mm 0.85kPa 24135m 1.7m/s 1.4m/s
11:00
0% 24°C 0mm 77% 0cm 79° 28°C 0mm 0.89kPa 24135m 1.6m/s 1.6m/s
12:00
0% 24°C 0mm 71% 0cm 84° 30°C 0mm 1.2kPa 24135m 1.9m/s 2.4m/s
13:00
0% 24°C 0mm 73% 0cm 71° 29°C 0mm 1.1kPa 24134m 2.6m/s 4.1m/s
14:00
1% 24°C 0.01mm 75% 0cm 57° 29°C 0.13mm 0.99kPa 24134m 3.1m/s 4.1m/s
15:00
1% 24°C 0mm 77% 0cm 43° 29°C 0.31mm 0.89kPa 24134m 2.8m/s 3.4m/s
16:00
2% 25°C 0.07mm 85% 0cm 29° 27°C 1.1mm 0.53kPa 24135m 2.9m/s 2.2m/s
17:00
2% 25°C 0.01mm 86% 0cm 15° 27°C 1.1mm 0.5kPa 24135m 1.3m/s 0.94m/s
18:00
1% 25°C 0mm 86% 0cm 2.1° 27°C 1.1mm 0.51kPa 24135m 0.5m/s 0.5m/s
19:00
1% 25°C 0mm 86% 0cm -12° 27°C 1.1mm 0.48kPa 24134m 1.3m/s 1.3m/s
20:00
1% 25°C 0mm 86% 0cm -24° 27°C 0mm 0.49kPa 24135m 1.2m/s 1.2m/s
21:00
0% 25°C 0mm 86% 0cm -36° 27°C 0.06mm 0.5kPa 24135m 1.5m/s 1.5m/s
22:00
0% 24°C 0mm 86% 0cm -46° 27°C 0.06mm 0.5kPa 24134m 2.5m/s 2.4m/s
23:00
0% 24°C 0mm 86% 0cm -52° 27°C 0.06mm 0.5kPa 24135m 3.2m/s 2.8m/s
Thu, May 21 Sunrise 05:16 Sunset 18:11
24:00
0% 24°C 0mm 86% 0cm -54° 27°C 0.06mm 0.47kPa 24135m 4.2m/s 3.3m/s
01:00
0% 24°C 0mm 86% 0cm -49° 27°C 0.06mm 0.47kPa 24134m 4.5m/s 3.3m/s
02:00
1% 24°C 0mm 74% 0cm -41° 29°C 0.04mm 1kPa 24134m 4.5m/s 2.9m/s
03:00
2% 22°C 0mm 62% 0cm -30° 30°C 0.02mm 1.6kPa 24135m 4.5m/s 2.4m/s
04:00
3% 21°C 0mm 50% 0cm -17° 32°C 0mm 2.4kPa 24135m 4.4m/s 2m/s
05:00
2% 21°C 0mm 49% 0cm -4.3° 33°C 0.04mm 2.5kPa 24135m 4.3m/s 2.1m/s
06:00
2% 21°C 0mm 48% 0cm 9.3° 33°C 0.08mm 2.7kPa 24135m 4.2m/s 2.2m/s
07:00
1% 21°C 0mm 47% 0cm 23° 34°C 0.13mm 2.8kPa 24135m 4m/s 2.4m/s
08:00
1% 23°C 0mm 62% 0cm 37° 31°C 0.69mm 1.8kPa 17465m 4m/s 2.3m/s
09:00
0% 24°C 0mm 76% 0cm 51° 29°C 1.3mm 0.93kPa 10795m 3.9m/s 2.3m/s
10:00
0% 24°C 0mm 91% 0cm 65° 26°C 1.8mm 0.31kPa 4124m 3.8m/s 2.2m/s
11:00
0% 24°C 0.1mm 93% 0cm 79° 25°C 2.7mm 0.24kPa 10795m 2.8m/s 1.7m/s
12:00
0% 24°C 0.21mm 94% 0cm 84° 25°C 3.6mm 0.17kPa 17465m 1.8m/s 1.2m/s
13:00
0% 23°C 0.31mm 96% 0cm 71° 24°C 4.4mm 0.11kPa 24135m 0.74m/s 0.61m/s
14:00
1% 23°C 0.21mm 96% 0cm 57° 24°C 3.2mm 0.11kPa 24135m 0.89m/s 0.85m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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