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Rule Fog Hunter

Mount Aso - Fog Hunter - Kyushu

Aso, Kumamoto, Japan

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
71%
Dewpoint Spread0.4°C
Visibility24135 (Clear)
Relative Humidity98%
Wind Speed2.0m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Tokyo
fog weather icon
Next opportunity
Dense Fog
Mount Aso
Tomorrow · 24:00–02:00 · 2h window
Medium confidence
56%
🌫️Fog Probability77.1-88.6%
Dewpoint Spread: 0.3°C
Visibility: 7751 (Moderate)
Relative Humidity: 98%
Wind Speed: 2.4m/s (calm conditions)
fog weather icon
Dense Fog
Mount Aso
Fri, Jul 10 · 02:00–04:00
🌫️Fog Probability:77.1-88.6%
Medium
fog weather icon
Dense Fog at Sunrise
Mount Aso
Fri, Jul 10 · 04:00–06:00
🌫️Fog Probability:77.1-88.6%
Medium
fog weather icon
Moderate Fog
Mount Aso
Fri, Jul 10 · 06:00–07:00
🌫️Fog Probability:77.1%
Medium
fog weather icon
Moderate Fog at Sunset
Mount Aso
Thu, Jul 16 · 18:00–20:00
🌫️Fog Probability:77.1-77.9%
Low

What this forecast looks for

Plain-language explanation from the rule

This forecast predicts when Kyushu's volcanic steam, subtropical humidity, and mountainous terrain create atmospheric photography conditions. We track temperature inversions, humidity patterns, and geothermal activity to identify when mist transforms calderas, forests, and onsen villages.

Kyushu's subtropical climate and active volcanism create fog conditions unlike anywhere else in Japan. Mount Aso's massive caldera traps morning mist around its active crater, while Yakushima's ancient cedars remain wrapped in perpetual cloud. Yufuin's onsen village sees lake mist rising from thermal springs beneath Mount Yufu's twin peaks.

What makes Kyushu fog photography special:

  • Volcanic steam mixing with natural fog - Mount Aso's active crater sends white plumes into morning mist creating otherworldly layers
  • Subtropical forest clouds - Yakushima's 3,000-year-old cedars emerge from moss-draped mist receiving 250+ inches annual rainfall
  • Onsen village atmospherics - Thermal springs in Yufuin and Beppu create steam rising from streets and ponds blending with natural fog
  • Crater lake mysteries - Kirishima's volcanic lakes develop morning fog banks isolated between peaks

Lake Kinrinko in Yufuin produces spectacular morning mist November through March when cold air meets thermal waters—arrive before dawn for steam rising across mirror-calm surface with Mount Yufu reflected. Mount Aso's caldera rim offers views into fog-filled volcanic bowls with Nakadake crater's steam plume above. Yakushima's forest trails become mystical when fog drifts through moss-covered ancient trees. Best conditions occur on clear cold winter mornings, though Yakushima's fog is reliably year-round.

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72-hour requirements breakdown

What passed or failed, hour by hour
11matching hours in the next 95 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Tokyo
Fog Probability
≥ 75.0%
Tue, Jul 7
22:0071%
23:0073%
Wed, Jul 8
24:0080%
01:0077%
02:0077%
03:0077%
04:0069%
05:0071%
06:0055%
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%
22:0071%
23:0071%
Thu, Jul 9
24:0077%
01:0089%
02:0073%
03:0073%
04:0071%
05:0071%
06:0071%
07:0046%
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%
23:0053%
Fri, Jul 10
24:0055%
01:0055%
02:0077%
03:0089%
04:0089%
05:0077%
06:0077%
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%
03:0065%
04:000%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:0051%
16:0042%
17:0042%
18:000%
19:000%
20:000%
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/Tokyo
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 05:14 Sunset 19:27
23:00 ☾
0% 21°C 0mm 98% 0cm -31° 21°C 0.13mm 0.06kPa 24135m 2.6m/s 2m/s
Thu, Jul 9 Sunrise 05:14 Sunset 19:27
24:00 ☾
0% 20°C 0mm 98% 0cm -34° 20°C 0.13mm 0.05kPa 9754m 2.8m/s 2.3m/s
01:00 ☾
0% 19°C 0mm 98% 0cm -34° 20°C 0.13mm 0.04kPa 7751m 3.3m/s 2.4m/s
02:00 ☾
0% 19°C 0mm 99% 0cm -30° 19°C 0.13mm 0.03kPa 17782m 3.5m/s 2.6m/s
03:00 ☾
0% 19°C 0mm 98% 0cm -23° 19°C 0.13mm 0.03kPa 24134m 3.6m/s 2.6m/s
04:00 ☾
27% 19°C 0mm 98% 0cm -14° 19°C 0mm 0.05kPa 24134m 3.7m/s 2.6m/s
05:00 ☾
54% 19°C 0mm 98% 0cm -3.4° 19°C 0mm 0.04kPa 24134m 3.8m/s 2.5m/s
06:00 ☾
81% 19°C 0mm 98% 0cm 8° 19°C 0mm 0.05kPa 24135m 3.7m/s 2.4m/s
07:00 ☾
87% 20°C 0mm 96% 0cm 20° 20°C 0mm 0.11kPa 24134m 4.1m/s 2.6m/s
08:00 ☾
93% 20°C 0mm 87% 0cm 32° 22°C 0mm 0.33kPa 24134m 3.5m/s 2.4m/s
09:00
99% 19°C 0mm 72% 0cm 45° 24°C 0mm 0.83kPa 24135m 3m/s 2.1m/s
10:00
99% 19°C 0mm 63% 0cm 57° 27°C 0mm 1.3kPa 24135m 2.4m/s 1.7m/s
11:00
100% 19°C 0mm 57% 0cm 69° 28°C 0mm 1.6kPa 24135m 2.5m/s 1.8m/s
12:00
100% 19°C 0mm 53% 0cm 78° 30°C 0mm 1.9kPa 24134m 2.6m/s 1.9m/s
13:00
100% 19°C 0mm 51% 0cm 76° 30°C 0mm 2.1kPa 24134m 2.4m/s 1.9m/s
14:00
99% 19°C 0mm 50% 0cm 66° 31°C 0mm 2.2kPa 24134m 1.9m/s 1.7m/s
15:00
99% 19°C 0mm 50% 0cm 53° 31°C 0mm 2.2kPa 24135m 1.4m/s 1.7m/s
16:00
67% 20°C 0mm 56% 0cm 41° 30°C 0mm 1.8kPa 24135m 1.4m/s 2.1m/s
17:00
35% 22°C 0mm 76% 0cm 28° 27°C 0.13mm 0.82kPa 22153m 2.6m/s 1.7m/s
18:00
3% 22°C 0mm 86% 0cm 16° 24°C 0.31mm 0.42kPa 24135m 0.9m/s 0.9m/s
19:00
3% 21°C 0.01mm 88% 0cm 4.5° 23°C 0.44mm 0.34kPa 24134m 0.9m/s 0.89m/s
20:00 ☾
2% 21°C 0mm 91% 0cm -6.8° 23°C 0.44mm 0.26kPa 24135m 2m/s 1.9m/s
21:00 ☾
2% 21°C 0mm 94% 0cm -17° 22°C 0.5mm 0.16kPa 24135m 2.1m/s 2m/s
22:00 ☾
16% 20°C 0mm 95% 0cm -25° 21°C 0mm 0.12kPa 24134m 2.5m/s 2.1m/s
23:00 ☾
29% 19°C 0mm 96% 0cm -31° 20°C 0mm 0.09kPa 24135m 2.8m/s 2.3m/s
Fri, Jul 10 Sunrise 05:14 Sunset 19:26
24:00 ☾
43% 19°C 0mm 97% 0cm -35° 19°C 0mm 0.07kPa 24135m 3m/s 2.5m/s
01:00 ☾
43% 19°C 0mm 97% 0cm -34° 19°C 0mm 0.07kPa 24134m 3.3m/s 2.6m/s
02:00 ☾
43% 18°C 0mm 98% 0cm -30° 19°C 0mm 0.05kPa 8879m 3.7m/s 2.7m/s
03:00 ☾
43% 19°C 0mm 98% 0cm -23° 19°C 0mm 0.04kPa 7702m 3.7m/s 2.6m/s
04:00 ☾
43% 19°C 0mm 98% 0cm -14° 19°C 0mm 0.04kPa 7630m 3.5m/s 2.5m/s
05:00 ☾
43% 19°C 0mm 98% 0cm -3.5° 19°C 0mm 0.05kPa 8666m 3.7m/s 2.8m/s
06:00 ☾
43% 19°C 0mm 97% 0cm 7.9° 20°C 0mm 0.06kPa 9957m 3.8m/s 2.7m/s
07:00 ☾
46% 21°C 0mm 92% 0cm 20° 22°C 0mm 0.2kPa 24135m 3.4m/s 2.2m/s
08:00 ☾
48% 21°C 0mm 81% 0cm 32° 24°C 0mm 0.57kPa 24135m 3.3m/s 2.3m/s
09:00
51% 20°C 0mm 70% 0cm 45° 26°C 0mm 1kPa 24135m 3.2m/s 2.3m/s
10:00
55% 20°C 0mm 64% 0cm 57° 27°C 0mm 1.3kPa 24135m 3m/s 2.3m/s
11:00
59% 20°C 0mm 60% 0cm 69° 29°C 0mm 1.6kPa 24135m 3m/s 2.6m/s
12:00
63% 20°C 0mm 57% 0cm 78° 30°C 0mm 1.8kPa 24134m 3.1m/s 2.7m/s
13:00
59% 20°C 0mm 55% 0cm 76° 30°C 0mm 1.9kPa 24135m 3.9m/s 3.4m/s
14:00
54% 20°C 0mm 53% 0cm 66° 30°C 0mm 2kPa 24134m 3.4m/s 3m/s
15:00
50% 19°C 0mm 53% 0cm 53° 30°C 0mm 2kPa 24135m 3m/s 2.9m/s
16:00
41% 20°C 0mm 55% 0cm 41° 30°C 0mm 1.8kPa 24134m 3.3m/s 3m/s
17:00
33% 20°C 0mm 63% 0cm 28° 28°C 0mm 1.4kPa 24134m 3.6m/s 2.8m/s
18:00
24% 21°C 0mm 75% 0cm 16° 26°C 0.06mm 0.83kPa 24135m 3.8m/s 2.1m/s
19:00
22% 21°C 0mm 84% 0cm 4.4° 24°C 0.06mm 0.48kPa 24134m 2.3m/s 2.1m/s
20:00 ☾
19% 20°C 0mm 87% 0cm -6.8° 23°C 0.13mm 0.35kPa 24134m 3m/s 2.3m/s
21:00 ☾
17% 20°C 0mm 91% 0cm -17° 22°C 0.13mm 0.24kPa 24134m 3.5m/s 2.6m/s
22:00 ☾
12% 20°C 0mm 92% 0cm -25° 21°C 0mm 0.2kPa 24135m 3.8m/s 2.7m/s
23:00 ☾
7% 20°C 0mm 93% 0cm -32° 21°C 0mm 0.18kPa 24134m 4.2m/s 2.9m/s
Sat, Jul 11 Sunrise 05:15 Sunset 19:26
24:00 ☾
2% 20°C 0mm 94% 0cm -35° 21°C 0mm 0.15kPa 9263m 4.2m/s 2.8m/s
01:00 ☾
2% 20°C 0mm 95% 0cm -34° 21°C 0mm 0.12kPa 4654m 4.3m/s 2.9m/s
02:00 ☾
1% 20°C 0mm 95% 0cm -30° 20°C 0mm 0.12kPa 3713m 4.7m/s 3.1m/s
03:00 ☾
1% 20°C 0mm 96% 0cm -23° 20°C 0mm 0.1kPa 5023m 4.6m/s 3m/s
04:00 ☾
3% 20°C 0.003mm 84% 0cm -14° 23°C 0.02mm 0.47kPa 11394m 4.9m/s 3.1m/s
05:00 ☾
5% 21°C 0.007mm 72% 0cm -3.6° 26°C 0.04mm 0.97kPa 17764m 5.3m/s 3.1m/s
06:00 ☾
7% 20°C 0.01mm 59% 0cm 7.8° 29°C 0.06mm 1.6kPa 24135m 5.6m/s 3.1m/s
07:00 ☾
7% 20°C 0.007mm 58% 0cm 20° 29°C 0.06mm 1.7kPa 24135m 5.6m/s 3.1m/s
08:00 ☾
7% 20°C 0.003mm 57% 0cm 32° 29°C 0.06mm 1.8kPa 24135m 5.5m/s 3m/s
09:00
7% 20°C 0mm 56% 0cm 45° 30°C 0.06mm 1.8kPa 24135m 5.4m/s 3m/s
10:00
10% 21°C 0mm 62% 0cm 57° 29°C 0.04mm 1.5kPa 24135m 5.1m/s 2.8m/s
11:00
12% 21°C 0mm 68% 0cm 69° 28°C 0.02mm 1.2kPa 24135m 4.7m/s 2.5m/s
12:00
15% 22°C 0mm 74% 0cm 78° 26°C 0mm 0.88kPa 24135m 4.3m/s 2.3m/s
13:00
15% 22°C 0mm 82% 0cm 76° 25°C 0.02mm 0.56kPa 19452m 4.4m/s 2.5m/s
14:00
14% 21°C 0mm 89% 0cm 66° 23°C 0.04mm 0.3kPa 14769m 4.5m/s 2.7m/s
15:00
14% 21°C 0mm 97% 0cm 53° 21°C 0.06mm 0.08kPa 10086m 4.5m/s 2.9m/s
16:00
14% 21°C 0mm 96% 0cm 41° 21°C 0.04mm 0.09kPa 14769m 4.2m/s 2.9m/s
17:00
15% 20°C 0mm 96% 0cm 28° 21°C 0.02mm 0.1kPa 19452m 3.9m/s 2.8m/s
18:00
15% 20°C 0mm 95% 0cm 16° 21°C 0mm 0.12kPa 24135m 3.6m/s 2.7m/s
19:00
15% 20°C 0mm 95% 0cm 4.4° 20°C 0mm 0.13kPa 24135m 3.5m/s 2.7m/s
20:00 ☾
15% 19°C 0mm 94% 0cm -6.9° 20°C 0mm 0.14kPa 24135m 3.4m/s 2.7m/s
21:00 ☾
15% 19°C 0mm 94% 0cm -17° 20°C 0mm 0.14kPa 24135m 3.3m/s 2.6m/s
22:00 ☾
15% 19°C 0mm 93% 0cm -25° 20°C 0mm 0.16kPa 24135m 3.3m/s 2.6m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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