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Rule Fog Hunter

Hanoi - Fog Hunter - Vietnam

Hanoi, Hanoi, 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 Spread4.5°C
Visibility14983 (Clear)
Relative Humidity77%
Wind Speed3.5m/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%
Wed, Jul 8
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:000%
22:000%
23:000%
Thu, Jul 9
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%
Fri, Jul 10
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%
Sat, Jul 11
24:000%
01:000%
02:000%
03:000%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
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13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
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
Wed, Jul 8 Sunrise 05:21 Sunset 18:41
21:00 ☾
3% 25°C 0mm 77% 0cm -28° 29°C 1.8mm 0.94kPa 14983m 6.9m/s 3.5m/s
22:00 ☾
5% 25°C 0mm 78% 0cm -37° 29°C 2.4mm 0.9kPa 24135m 5.7m/s 3m/s
23:00 ☾
4% 25°C 0mm 80% 0cm -44° 29°C 2.4mm 0.81kPa 24135m 5m/s 2.8m/s
Thu, Jul 9 Sunrise 05:21 Sunset 18:41
24:00 ☾
2% 25°C 0mm 82% 0cm -47° 28°C 2.5mm 0.71kPa 24135m 4.7m/s 2.6m/s
01:00 ☾
1% 25°C 0mm 82% 0cm -44° 28°C 2.6mm 0.68kPa 24134m 5.4m/s 2.8m/s
02:00 ☾
3% 25°C 0mm 82% 0cm -38° 28°C 0mm 0.68kPa 24134m 4.4m/s 2.3m/s
03:00 ☾
6% 25°C 0mm 82% 0cm -29° 28°C 0mm 0.67kPa 24134m 3.4m/s 2.1m/s
04:00 ☾
8% 24°C 0mm 83% 0cm -17° 28°C 0mm 0.63kPa 24135m 2.4m/s 1.6m/s
05:00 ☾
10% 25°C 0mm 84% 0cm -5.3° 27°C 0.31mm 0.56kPa 15157m 1.8m/s 1.3m/s
06:00 ☾
12% 25°C 0mm 84% 0cm 7.6° 28°C 0.69mm 0.6kPa 24134m 1.8m/s 1.3m/s
07:00
14% 25°C 0mm 79% 0cm 21° 28°C 1.8mm 0.81kPa 24135m 2.4m/s 1.8m/s
08:00
20% 24°C 0mm 72% 0cm 34° 30°C 2.1mm 1.2kPa 14966m 2.2m/s 1.9m/s
09:00
26% 24°C 0mm 65% 0cm 48° 32°C 2.6mm 1.7kPa 24135m 0.7m/s 0.99m/s
10:00
32% 24°C 0mm 58% 0cm 62° 33°C 2.6mm 2.2kPa 24134m 1m/s 0.21m/s
11:00
29% 24°C 0mm 53% 0cm 76° 35°C 2.6mm 2.6kPa 24134m 1.9m/s 1.1m/s
12:00
26% 23°C 0mm 50% 0cm 89° 35°C 2.6mm 2.8kPa 24134m 3.2m/s 2.2m/s
13:00
23% 23°C 0mm 48% 0cm 76° 36°C 2.6mm 3kPa 24135m 3.9m/s 2.7m/s
14:00
18% 23°C 0mm 47% 0cm 63° 36°C 0mm 3.2kPa 24135m 3.5m/s 2.2m/s
15:00
13% 23°C 0mm 46% 0cm 49° 37°C 0mm 3.4kPa 24134m 3.5m/s 2m/s
16:00
8% 23°C 0mm 46% 0cm 35° 37°C 0mm 3.3kPa 24135m 3m/s 1.3m/s
17:00
7% 24°C 0mm 52% 0cm 22° 35°C 0.06mm 2.7kPa 24134m 3.6m/s 2.7m/s
18:00
5% 25°C 0mm 65% 0cm 8.4° 33°C 0.13mm 1.7kPa 24135m 6.4m/s 4.3m/s
19:00 ☾
4% 25°C 0mm 68% 0cm -4.5° 31°C 0.56mm 1.5kPa 24135m 7.7m/s 4.3m/s
20:00 ☾
4% 25°C 0mm 70% 0cm -17° 31°C 0.13mm 1.4kPa 24134m 8.2m/s 4.4m/s
21:00 ☾
5% 25°C 0mm 71% 0cm -28° 30°C 0.19mm 1.2kPa 24135m 8.1m/s 4.3m/s
22:00 ☾
5% 25°C 0mm 74% 0cm -37° 30°C 0.19mm 1.1kPa 24135m 7.2m/s 4m/s
23:00 ☾
5% 25°C 0mm 77% 0cm -44° 29°C 0.19mm 0.93kPa 24134m 6.4m/s 3.4m/s
Fri, Jul 10 Sunrise 05:21 Sunset 18:41
24:00 ☾
4% 25°C 0mm 80% 0cm -47° 29°C 0.38mm 0.81kPa 24135m 4.5m/s 2.5m/s
01:00 ☾
4% 25°C 0mm 81% 0cm -44° 29°C 0.56mm 0.73kPa 24135m 2.4m/s 1.6m/s
02:00 ☾
7% 25°C 0mm 85% 0cm -38° 28°C 1.1mm 0.57kPa 8865m 1.4m/s 1.2m/s
03:00 ☾
11% 25°C 0.01mm 82% 0cm -29° 28°C 1.6mm 0.69kPa 24135m 1.1m/s 0.63m/s
04:00 ☾
14% 25°C 0mm 82% 0cm -18° 28°C 2.4mm 0.67kPa 24135m 2.1m/s 1.4m/s
05:00 ☾
13% 25°C 0mm 84% 0cm -5.4° 28°C 2.6mm 0.6kPa 24135m 3.1m/s 1.7m/s
06:00 ☾
11% 25°C 0mm 84% 0cm 7.5° 28°C 2.6mm 0.61kPa 24135m 3.7m/s 2.1m/s
07:00
10% 25°C 0mm 80% 0cm 21° 28°C 2.7mm 0.79kPa 24135m 4.2m/s 2.5m/s
08:00
13% 24°C 0mm 73% 0cm 34° 29°C 0mm 1.1kPa 24135m 3.9m/s 2.7m/s
09:00
17% 23°C 0mm 67% 0cm 48° 30°C 0mm 1.4kPa 24135m 3.5m/s 2.7m/s
10:00
20% 23°C 0mm 60% 0cm 62° 32°C 0mm 1.9kPa 24134m 3m/s 2.6m/s
11:00
19% 22°C 0mm 52% 0cm 76° 33°C 0mm 2.4kPa 24135m 2.9m/s 2.1m/s
12:00
19% 22°C 0mm 48% 0cm 89° 35°C 0mm 2.9kPa 24134m 2.5m/s 1.6m/s
13:00
18% 22°C 0mm 46% 0cm 76° 36°C 0mm 3.2kPa 24135m 2.5m/s 1.2m/s
14:00
17% 22°C 0mm 44% 0cm 63° 36°C 0mm 3.4kPa 24134m 2.5m/s 0.74m/s
15:00
15% 22°C 0mm 44% 0cm 49° 36°C 0mm 3.4kPa 24134m 3m/s 1.3m/s
16:00
14% 22°C 0mm 45% 0cm 35° 36°C 0mm 3.2kPa 24135m 2.9m/s 1.5m/s
17:00
13% 22°C 0mm 48% 0cm 22° 35°C 0mm 3kPa 24134m 2.2m/s 0.98m/s
18:00
11% 24°C 0mm 55% 0cm 8.3° 34°C 0mm 2.4kPa 24134m 1.4m/s 1m/s
19:00 ☾
10% 24°C 0mm 61% 0cm -4.6° 32°C 0mm 1.9kPa 24134m 3.1m/s 1.8m/s
20:00 ☾
11% 24°C 0mm 65% 0cm -17° 31°C 0.19mm 1.6kPa 24135m 4.7m/s 3.1m/s
21:00 ☾
11% 24°C 0mm 65% 0cm -28° 31°C 0.19mm 1.6kPa 24134m 5.2m/s 3.2m/s
22:00 ☾
12% 24°C 0mm 67% 0cm -38° 30°C 0.19mm 1.4kPa 24134m 4.7m/s 2.7m/s
23:00 ☾
11% 24°C 0mm 69% 0cm -44° 30°C 0.19mm 1.3kPa 24135m 2.8m/s 1.8m/s
Sat, Jul 11 Sunrise 05:22 Sunset 18:41
24:00 ☾
9% 24°C 0mm 69% 0cm -47° 30°C 0.19mm 1.3kPa 24135m 1.1m/s 0.76m/s
01:00 ☾
8% 24°C 0mm 70% 0cm -45° 30°C 0.25mm 1.3kPa 24135m 0.91m/s 0.52m/s
02:00 ☾
10% 24°C 0mm 67% 0cm -38° 30°C 0.17mm 1.4kPa 24135m 1.6m/s 1.1m/s
03:00 ☾
13% 24°C 0mm 65% 0cm -29° 31°C 0.08mm 1.6kPa 24135m 2.2m/s 1.8m/s
04:00 ☾
15% 24°C 0mm 62% 0cm -18° 32°C 0mm 1.8kPa 24135m 2.9m/s 2.4m/s
05:00 ☾
15% 24°C 0mm 57% 0cm -5.5° 33°C 0mm 2.2kPa 24135m 3.2m/s 2.8m/s
06:00 ☾
16% 23°C 0mm 53% 0cm 7.4° 34°C 0mm 2.6kPa 24135m 3.5m/s 3.2m/s
07:00
16% 23°C 0mm 48% 0cm 21° 36°C 0mm 3kPa 24135m 3.7m/s 3.6m/s
08:00
21% 23°C 0mm 47% 0cm 34° 36°C 0mm 3.1kPa 24135m 3.2m/s 2.8m/s
09:00
27% 23°C 0mm 47% 0cm 48° 36°C 0mm 3.2kPa 24135m 2.7m/s 1.9m/s
10:00
32% 23°C 0mm 46% 0cm 62° 36°C 0mm 3.2kPa 24135m 2.2m/s 1.1m/s
11:00
30% 24°C 0mm 54% 0cm 76° 34°C 0.04mm 2.5kPa 24135m 4.1m/s 2.2m/s
12:00
27% 24°C 0mm 61% 0cm 89° 32°C 0.08mm 1.9kPa 24135m 6m/s 3.4m/s
13:00
25% 24°C 0mm 69% 0cm 77° 31°C 0.13mm 1.4kPa 24135m 7.8m/s 4.5m/s
14:00
30% 24°C 0mm 71% 0cm 63° 30°C 0.33mm 1.3kPa 24135m 6.8m/s 3.8m/s
15:00
34% 25°C 0mm 73% 0cm 49° 30°C 0.54mm 1.1kPa 24135m 5.8m/s 3.1m/s
16:00
39% 25°C 0mm 75% 0cm 35° 30°C 0.75mm 1.1kPa 24135m 4.8m/s 2.3m/s
17:00
38% 25°C 0mm 77% 0cm 22° 29°C 0.75mm 0.92kPa 24135m 4.3m/s 2.3m/s
18:00
38% 25°C 0mm 80% 0cm 8.3° 29°C 0.75mm 0.79kPa 24135m 3.7m/s 2.2m/s
19:00 ☾
37% 25°C 0mm 82% 0cm -4.6° 28°C 0.75mm 0.68kPa 24135m 3.1m/s 2.1m/s
20:00 ☾
29% 25°C 0mm 83% 0cm -17° 28°C 0.5mm 0.65kPa 24135m 2.6m/s 1.9m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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