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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
65%
Dewpoint Spread0.7°C
Visibility4216 (Mist/Haze)
Relative Humidity95%
Wind Speed2.5m/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 · 01:00–03:00 · 2h window
Medium confidence
53%
🌫️Fog Probability77.1-86%
Dewpoint Spread: 0.4°C
Visibility: 4434 (Mist/Haze)
Relative Humidity: 98%
Wind Speed: 2.4m/s (calm conditions)
fog weather icon
Dense Fog at Sunrise
Mount Aso
Tomorrow · 04:00–06:00
🌫️Fog Probability:77.1-86%
Medium
fog weather icon
Dense Fog
Mount Aso
Tue, May 26 · 01:00–04:00
🌫️Fog Probability:86%
High
fog weather icon
Dense Fog
Mount Aso
Wed, May 27 · 16:00–18:00
🌫️Fog Probability:96.2%
High
fog weather icon
Dense Fog at Sunset
Mount Aso
Wed, May 27 · 18:00–20:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Mount Aso
Wed, May 27 · 20:00–23:00
🌫️Fog Probability:77.1-100%
Medium

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
12matching hours in the next 80 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Tokyo
Fog Probability
≥ 75.0%
Sun, May 24
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:0071%
21:0071%
22:0065%
23:000%
Mon, May 25
24:000%
01:0086%
02:0077%
03:0071%
04:0077%
05:0086%
06:0060%
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%
21:0030%
22:0055%
23:0055%
Tue, May 26
24:0071%
01:0086%
02:0086%
03:0086%
04:0071%
05:0055%
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%
22:000%
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%
12:0054%
13:0044%
14:0044%
15:0051%
16:0096%
17:0096%
18:00100%
19:00100%
20:00100%
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
Sun, May 24 Sunrise 05:11 Sunset 19:13
22:00 ☾
0% 17°C 0mm 95% 0cm -28° 17°C 0mm 0.09kPa 4216m 3.8m/s 2.5m/s
23:00 ☾
0% 16°C 0mm 95% 0cm -33° 17°C 0mm 0.1kPa 4089m 3.6m/s 2.4m/s
Mon, May 25 Sunrise 05:11 Sunset 19:13
24:00 ☾
0% 16°C 0mm 95% 0cm -36° 17°C 0mm 0.09kPa 3856m 3.5m/s 2.4m/s
01:00 ☾
0% 16°C 0mm 98% 0cm -35° 16°C 0mm 0.05kPa 4434m 3.4m/s 2.4m/s
02:00 ☾
0% 16°C 0mm 98% 0cm -30° 16°C 0mm 0.04kPa 8854m 2.8m/s 2.3m/s
03:00 ☾
0% 16°C 0mm 98% 0cm -23° 16°C 0mm 0.04kPa 12889m 3.6m/s 2.7m/s
04:00 ☾
2% 16°C 0mm 98% 0cm -14° 16°C 0mm 0.04kPa 9333m 3.5m/s 2.6m/s
05:00 ☾
3% 16°C 0mm 98% 0cm -2.8° 16°C 0mm 0.04kPa 5372m 3.6m/s 2.6m/s
06:00 ☾
5% 16°C 0mm 96% 0cm 8.8° 17°C 0mm 0.07kPa 9468m 3.7m/s 2.5m/s
07:00 ☾
6% 17°C 0mm 90% 0cm 21° 19°C 0mm 0.22kPa 24134m 4m/s 2.5m/s
08:00 ☾
8% 16°C 0mm 76% 0cm 33° 21°C 0mm 0.59kPa 24135m 3.9m/s 2.5m/s
09:00
9% 16°C 0mm 68% 0cm 46° 22°C 0mm 0.88kPa 24135m 3.9m/s 2.7m/s
10:00
28% 16°C 0mm 61% 0cm 58° 24°C 0mm 1.1kPa 24135m 2.8m/s 2.5m/s
11:00
47% 16°C 0mm 56% 0cm 70° 25°C 0mm 1.4kPa 24135m 2.4m/s 2.5m/s
12:00
66% 16°C 0mm 52% 0cm 78° 26°C 0.06mm 1.6kPa 24135m 1.6m/s 2.1m/s
13:00
49% 15°C 0mm 49% 0cm 74° 27°C 0.06mm 1.8kPa 24134m 1.5m/s 1.9m/s
14:00
31% 15°C 0mm 49% 0cm 63° 27°C 0.06mm 1.8kPa 24134m 1.6m/s 1.3m/s
15:00
14% 18°C 0mm 69% 0cm 51° 24°C 0.13mm 0.89kPa 23649m 3.1m/s 1.8m/s
16:00
10% 19°C 0.03mm 79% 0cm 39° 22°C 0.13mm 0.57kPa 23827m 1.7m/s 1.1m/s
17:00
5% 18°C 0.02mm 83% 0cm 26° 21°C 0.38mm 0.43kPa 23594m 0.6m/s 0.5m/s
18:00
1% 18°C 0.02mm 87% 0cm 14° 20°C 0.5mm 0.31kPa 24135m 1.5m/s 1.6m/s
19:00
2% 18°C 0mm 90% 0cm 2.2° 19°C 0.56mm 0.22kPa 24135m 1.8m/s 2.1m/s
20:00 ☾
4% 17°C 0mm 94% 0cm -9.1° 18°C 0.56mm 0.12kPa 24134m 2.4m/s 2.2m/s
21:00 ☾
5% 16°C 0mm 96% 0cm -19° 17°C 0.56mm 0.08kPa 24135m 3.1m/s 2.5m/s
22:00 ☾
14% 16°C 0mm 97% 0cm -27° 16°C 0mm 0.06kPa 24134m 3.2m/s 2.6m/s
23:00 ☾
23% 16°C 0mm 97% 0cm -33° 16°C 0mm 0.06kPa 24134m 3.2m/s 2.6m/s
Tue, May 26 Sunrise 05:11 Sunset 19:14
24:00 ☾
32% 15°C 0mm 97% 0cm -36° 16°C 0mm 0.05kPa 13319m 3.1m/s 2.5m/s
01:00 ☾
31% 15°C 0mm 97% 0cm -35° 15°C 0mm 0.04kPa 7824m 3.2m/s 2.6m/s
02:00 ☾
31% 14°C 0mm 98% 0cm -30° 15°C 0mm 0.04kPa 4570m 3.2m/s 2.7m/s
03:00 ☾
30% 14°C 0mm 98% 0cm -23° 15°C 0mm 0.04kPa 4942m 3.4m/s 2.7m/s
04:00 ☾
30% 14°C 0mm 97% 0cm -13° 14°C 0mm 0.05kPa 24135m 3.8m/s 2.9m/s
05:00 ☾
30% 14°C 0mm 97% 0cm -2.7° 14°C 0mm 0.05kPa 24134m 3.4m/s 2.7m/s
06:00 ☾
30% 14°C 0mm 96% 0cm 8.9° 15°C 0mm 0.07kPa 24135m 4.1m/s 2.9m/s
07:00 ☾
24% 15°C 0mm 89% 0cm 21° 17°C 0mm 0.21kPa 24134m 4.1m/s 3m/s
08:00 ☾
19% 15°C 0mm 78% 0cm 33° 19°C 0mm 0.5kPa 24134m 4.6m/s 3.2m/s
09:00
13% 15°C 0mm 69% 0cm 46° 20°C 0mm 0.73kPa 24135m 4.2m/s 2.6m/s
10:00
12% 14°C 0mm 57% 0cm 58° 23°C 0mm 1.2kPa 24134m 4.2m/s 2.7m/s
11:00
11% 14°C 0mm 55% 0cm 70° 24°C 0mm 1.3kPa 24135m 3.2m/s 2.2m/s
12:00
10% 15°C 0mm 53% 0cm 78° 25°C 0mm 1.4kPa 24134m 3.1m/s 2.1m/s
13:00
8% 15°C 0.01mm 52% 0cm 74° 25°C 0mm 1.5kPa 24134m 2.8m/s 2.1m/s
14:00
5% 17°C 0.17mm 83% 0cm 63° 20°C 0.25mm 0.39kPa 24134m 3.3m/s 2.3m/s
15:00
3% 17°C 0mm 86% 0cm 51° 20°C 0.31mm 0.33kPa 24135m 3.5m/s 2m/s
16:00
2% 16°C 0mm 80% 0cm 39° 20°C 0mm 0.47kPa 24134m 4.9m/s 2.6m/s
17:00
1% 16°C 0mm 70% 0cm 26° 21°C 0mm 0.74kPa 24135m 4.7m/s 2.8m/s
18:00
0% 16°C 0mm 79% 0cm 14° 20°C 0mm 0.48kPa 23768m 5m/s 2.4m/s
19:00
0% 16°C 0.04mm 85% 0cm 2.3° 18°C 0.06mm 0.32kPa 24135m 3.4m/s 2.3m/s
20:00 ☾
0% 16°C 1.5mm 94% 0cm -9° 17°C 0.75mm 0.11kPa 9023m 3.6m/s 2.4m/s
21:00 ☾
0% 16°C 2.5mm 98% 0cm -19° 16°C 2.4mm 0.05kPa 6669m 4.3m/s 2.5m/s
22:00 ☾
0% 16°C 3mm 98% 0cm -27° 16°C 2.9mm 0.04kPa 5976m 6.3m/s 3.2m/s
23:00 ☾
0% 16°C 1.9mm 97% 0cm -33° 16°C 5.2mm 0.05kPa 6480m 8.1m/s 3.5m/s
Wed, May 27 Sunrise 05:10 Sunset 19:15
24:00 ☾
0% 15°C 0.66mm 97% 0cm -36° 16°C 6.4mm 0.05kPa 12769m 7.5m/s 3.6m/s
01:00 ☾
0% 15°C 4.5mm 98% 0cm -35° 16°C 7.9mm 0.04kPa 4438m 8.2m/s 3m/s
02:00 ☾
1% 15°C 2.5mm 98% 0cm -30° 16°C 12mm 0.04kPa 3377m 9.7m/s 3.7m/s
03:00 ☾
1% 15°C 2.1mm 97% 0cm -23° 16°C 14mm 0.05kPa 3139m 9.8m/s 3.6m/s
04:00 ☾
1% 16°C 1.5mm 97% 0cm -13° 16°C 11mm 0.05kPa 3318m 8.5m/s 3.5m/s
05:00 ☾
0% 16°C 0.95mm 97% 0cm -2.6° 17°C 7.6mm 0.05kPa 3498m 7.3m/s 3.5m/s
06:00 ☾
0% 17°C 0.38mm 97% 0cm 8.9° 17°C 4.3mm 0.05kPa 3677m 6m/s 3.4m/s
07:00 ☾
0% 17°C 0.26mm 97% 0cm 21° 17°C 4.4mm 0.07kPa 5946m 5.9m/s 3.3m/s
08:00 ☾
0% 17°C 0.13mm 96% 0cm 33° 18°C 4.5mm 0.09kPa 8215m 5.8m/s 3.2m/s
09:00
0% 17°C 0.01mm 95% 0cm 46° 18°C 4.6mm 0.1kPa 10485m 5.7m/s 3.1m/s
10:00
0% 17°C 0.03mm 96% 0cm 58° 18°C 3.1mm 0.09kPa 8213m 5.5m/s 3.1m/s
11:00
0% 17°C 0.04mm 96% 0cm 70° 18°C 1.7mm 0.08kPa 5941m 5.4m/s 3.1m/s
12:00
0% 17°C 0.06mm 97% 0cm 78° 18°C 0.19mm 0.07kPa 3669m 5.2m/s 3.1m/s
13:00
0% 17°C 0.04mm 97% 0cm 74° 18°C 0.21mm 0.06kPa 2656m 4.9m/s 2.8m/s
14:00
0% 17°C 0.03mm 98% 0cm 64° 18°C 0.23mm 0.05kPa 1644m 4.5m/s 2.6m/s
15:00
0% 17°C 0.01mm 98% 0cm 51° 18°C 0.25mm 0.04kPa 632m 4.1m/s 2.4m/s
16:00
0% 18°C 0.007mm 98% 0cm 39° 18°C 0.17mm 0.04kPa 483m 3.6m/s 2.2m/s
17:00
0% 18°C 0.003mm 98% 0cm 26° 18°C 0.08mm 0.04kPa 333m 3m/s 2m/s
18:00
0% 18°C 0mm 98% 0cm 14° 18°C 0mm 0.04kPa 184m 2.4m/s 1.8m/s
19:00
0% 18°C 0.003mm 98% 0cm 2.5° 18°C 0mm 0.04kPa 1457m 2m/s 1.5m/s
20:00 ☾
0% 18°C 0.007mm 98% 0cm -8.8° 19°C 0mm 0.04kPa 2730m 1.5m/s 1.3m/s
21:00 ☾
0% 18°C 0.01mm 98% 0cm -19° 19°C 0mm 0.04kPa 4004m 1.1m/s 1.1m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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