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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
53%
Dewpoint Spread0.6°C
Visibility24134 (Clear)
Relative Humidity96%
Wind Speed1.7m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Asia/Tokyo
fog weather icon
Next opportunity
Moderate Fog at Sunset
Mount Aso
Tomorrow · 19:00–20:00 · 1h window
Medium confidence
48%
🌫️Fog Probability65.4%
Dewpoint Spread: 0.6°C
Visibility: 3583 (Mist/Haze)
Relative Humidity: 96%
Wind Speed: 2.5m/s (calm conditions)
fog weather icon
Dense Fog
Mount Aso
Tomorrow · 20:00–05:00
🌫️Fog Probability:62.7-100%
High
fog weather icon
Dense Fog at Sunrise
Mount Aso
Mon, Apr 20 · 05:00–07:00
🌫️Fog Probability:87.3-91.1%
High
fog weather icon
Moderate Fog
Mount Aso
Mon, Apr 20 · 22:00–24:00
🌫️Fog Probability:63.4-65.4%
Low
fog weather icon
Dense Fog at Sunset
Mount Aso
Thu, Apr 23 · 18:00–20:00
🌫️Fog Probability:82.2-87.3%
High
fog weather icon
Moderate Fog
Mount Aso
Thu, Apr 23 · 20:00–22:00
🌫️Fog Probability:75.8-82.2%
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
14matching hours in the next 80 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Asia/Tokyo
Fog Probability
≥ 60.0%
Sat, Apr 18
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0019%
20:0030%
21:0030%
22:0053%
23:0059%
Sun, Apr 19
24:0035%
01:0041%
02:000%
03:000%
04:0045%
05:000%
06:000%
07:000%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:0030%
18:0036%
19:0065%
20:0085%
21:0095%
22:0095%
23:00100%
Mon, Apr 20
24:00100%
01:0077%
02:0063%
03:0077%
04:0082%
05:0087%
06:0091%
07:0049%
08:000%
09:000%
10:000%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:0030%
20:000%
21:000%
22:0065%
23:0063%
Tue, Apr 21
24:0048%
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%
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
Sat, Apr 18 Sunrise 05:43 Sunset 18:47
22:00 ☾
0% 13°C 0.03mm 96% 0cm -36° 13°C 0mm 0.06kPa 24134m 1.9m/s 1.7m/s
23:00 ☾
0% 12°C 0.08mm 96% 0cm -43° 13°C 0.06mm 0.06kPa 24135m 2.5m/s 1.9m/s
Sun, Apr 19 Sunrise 05:43 Sunset 18:47
24:00 ☾
0% 12°C 0.27mm 97% 0cm -46° 13°C 0.25mm 0.05kPa 22856m 2.8m/s 1.9m/s
01:00 ☾
0% 12°C 0.35mm 97% 0cm -45° 12°C 0.44mm 0.04kPa 20481m 2m/s 1.5m/s
02:00 ☾
0% 12°C 0.44mm 97% 0cm -39° 12°C 1mm 0.04kPa 20355m 3.1m/s 2m/s
03:00 ☾
0% 12°C 0.57mm 97% 0cm -31° 12°C 1.3mm 0.04kPa 17425m 3.1m/s 1.9m/s
04:00 ☾
0% 12°C 0.74mm 97% 0cm -21° 12°C 0.56mm 0.04kPa 13605m 2.6m/s 1.8m/s
05:00 ☾
0% 12°C 0.72mm 97% 0cm -9.2° 12°C 1.3mm 0.04kPa 13251m 4.1m/s 2.1m/s
06:00 ☾
0% 12°C 0.77mm 97% 0cm 3.1° 12°C 2mm 0.04kPa 4759m 5.3m/s 2.4m/s
07:00 ☾
0% 12°C 0.6mm 97% 0cm 15° 12°C 2.4mm 0.04kPa 7539m 7.8m/s 2.6m/s
08:00 ☾
0% 12°C 0.21mm 96% 0cm 28° 13°C 3.1mm 0.06kPa 8199m 9.8m/s 2.5m/s
09:00
0% 13°C 1.7mm 94% 0cm 40° 13°C 3.8mm 0.09kPa 7391m 6.2m/s 1.6m/s
10:00
0% 12°C 1.1mm 95% 0cm 52° 13°C 1.5mm 0.07kPa 11066m 8.7m/s 2.7m/s
11:00
0% 13°C 0.81mm 93% 0cm 62° 14°C 2.5mm 0.11kPa 12060m 7.6m/s 2.6m/s
12:00
0% 12°C 0.02mm 92% 0cm 68° 14°C 2.9mm 0.13kPa 24135m 7.2m/s 2.4m/s
13:00
0% 12°C 0.11mm 93% 0cm 66° 13°C 3mm 0.1kPa 24135m 7.5m/s 2.4m/s
14:00
0% 12°C 0.02mm 95% 0cm 58° 13°C 3.2mm 0.07kPa 24134m 7.1m/s 2.6m/s
15:00
0% 12°C 0mm 94% 0cm 46° 13°C 3.2mm 0.09kPa 9884m 7.8m/s 2.6m/s
16:00
0% 12°C 0.01mm 92% 0cm 34° 13°C 0mm 0.11kPa 11551m 7.3m/s 2.6m/s
17:00
0% 11°C 0mm 94% 0cm 22° 12°C 0mm 0.08kPa 24134m 7.3m/s 2.6m/s
18:00
0% 11°C 0mm 95% 0cm 9.3° 12°C 0mm 0.07kPa 7754m 7m/s 2.5m/s
19:00 ☾
0% 11°C 0.01mm 96% 0cm -3.1° 12°C 0.06mm 0.05kPa 3583m 6.9m/s 2.5m/s
20:00 ☾
0% 11°C 0mm 97% 0cm -15° 12°C 0.06mm 0.04kPa 1557m 6.8m/s 2.4m/s
21:00 ☾
0% 12°C 0.01mm 98% 0cm -26° 12°C 0.06mm 0.03kPa 352m 6.3m/s 2.2m/s
22:00 ☾
0% 12°C 0.01mm 98% 0cm -35° 12°C 0mm 0.03kPa 233m 6m/s 2.2m/s
23:00 ☾
0% 12°C 0.01mm 98% 0cm -42° 12°C 0.06mm 0.03kPa 137m 5.8m/s 2.2m/s
Mon, Apr 20 Sunrise 05:41 Sunset 18:48
24:00 ☾
0% 12°C 0mm 98% 0cm -46° 12°C 0.06mm 0.03kPa 154m 4.2m/s 2m/s
01:00 ☾
1% 12°C 0mm 97% 0cm -44° 12°C 0.06mm 0.04kPa 5159m 3.9m/s 2.4m/s
02:00 ☾
1% 12°C 0.02mm 96% 0cm -39° 12°C 0.13mm 0.05kPa 24134m 4.1m/s 2.4m/s
03:00 ☾
2% 11°C 0.02mm 97% 0cm -31° 12°C 0.13mm 0.04kPa 7852m 3.7m/s 2.1m/s
04:00 ☾
4% 11°C 0mm 97% 0cm -20° 12°C 0mm 0.04kPa 7638m 2.9m/s 2m/s
05:00 ☾
7% 11°C 0mm 98% 0cm -8.9° 11°C 0mm 0.03kPa 7635m 3.4m/s 2.4m/s
06:00 ☾
9% 11°C 0mm 98% 0cm 3.4° 11°C 0mm 0.03kPa 4894m 3.6m/s 2.5m/s
07:00 ☾
11% 12°C 0mm 96% 0cm 16° 13°C 0mm 0.06kPa 3626m 4.1m/s 2.4m/s
08:00 ☾
13% 13°C 0mm 89% 0cm 28° 14°C 0mm 0.19kPa 8888m 3.7m/s 2.3m/s
09:00
15% 13°C 0mm 80% 0cm 41° 16°C 0.06mm 0.38kPa 24134m 3m/s 1.7m/s
10:00
24% 13°C 0mm 71% 0cm 52° 18°C 0.06mm 0.62kPa 13017m 2.7m/s 1.6m/s
11:00
32% 13°C 0mm 72% 0cm 63° 18°C 0.63mm 0.57kPa 11763m 2.4m/s 1.9m/s
12:00
41% 13°C 0mm 67% 0cm 68° 20°C 0.75mm 0.75kPa 23943m 2.2m/s 1.6m/s
13:00
31% 13°C 0mm 63% 0cm 66° 20°C 1mm 0.88kPa 24135m 2.4m/s 2m/s
14:00
21% 13°C 0mm 58% 0cm 58° 21°C 1.2mm 1kPa 24134m 2.2m/s 2m/s
15:00
11% 13°C 0mm 59% 0cm 47° 21°C 1.4mm 1kPa 24134m 3.3m/s 3.3m/s
16:00
9% 12°C 0mm 62% 0cm 34° 20°C 0.06mm 0.88kPa 24038m 4m/s 3.9m/s
17:00
6% 13°C 0mm 75% 0cm 22° 18°C 0.38mm 0.51kPa 19439m 5.1m/s 3.6m/s
18:00
4% 14°C 0mm 88% 0cm 9.4° 16°C 0.56mm 0.22kPa 17569m 4.6m/s 2.4m/s
19:00 ☾
3% 14°C 0.52mm 95% 0cm -2.9° 14°C 0.81mm 0.08kPa 23388m 2.9m/s 1.6m/s
20:00 ☾
3% 14°C 0.26mm 98% 0cm -15° 14°C 1.2mm 0.02kPa 6661m 2.2m/s 1.3m/s
21:00 ☾
2% 14°C 0.08mm 99% 0cm -26° 14°C 1.6mm 0.01kPa 552m 2.4m/s 1.3m/s
22:00 ☾
2% 14°C 0mm 99% 0cm -35° 14°C 0.25mm 0.01kPa 404m 2.3m/s 1.5m/s
23:00 ☾
1% 14°C 0mm 99% 0cm -42° 14°C 0.5mm 0.01kPa 488m 2m/s 1.3m/s
Tue, Apr 21 Sunrise 05:40 Sunset 18:49
24:00 ☾
1% 13°C 0mm 98% 0cm -45° 14°C 0.81mm 0.04kPa 5161m 1.8m/s 1.1m/s
01:00 ☾
1% 12°C 0mm 98% 0cm -44° 13°C 1mm 0.03kPa 19861m 1m/s 0.94m/s
02:00 ☾
0% 12°C 0mm 99% 0cm -39° 12°C 1.4mm 0.02kPa 20584m 0.9m/s 0.85m/s
03:00 ☾
0% 12°C 0mm 97% 0cm -30° 13°C 1.4mm 0.05kPa 24135m 0.72m/s 0.72m/s
04:00 ☾
1% 9.7°C 0mm 73% 0cm -20° 15°C 0.96mm 0.45kPa 24135m 2.1m/s 1.5m/s
05:00 ☾
3% 5.6°C 0mm 49% 0cm -8.7° 16°C 0.48mm 0.95kPa 24135m 3.5m/s 2.2m/s
06:00 ☾
4% -2.2°C 0mm 25% 0cm 3.6° 18°C 0mm 1.6kPa 24135m 4.8m/s 3m/s
07:00 ☾
3% -1.3°C 0mm 26% 0cm 16° 19°C 0mm 1.6kPa 24135m 4.2m/s 2.6m/s
08:00 ☾
2% -0.3°C 0mm 27% 0cm 28° 19°C 0mm 1.6kPa 24135m 3.5m/s 2.2m/s
09:00
1% 0.6°C 0mm 28% 0cm 41° 19°C 0mm 1.6kPa 24135m 2.8m/s 1.8m/s
10:00
3% 3.8°C 0mm 40% 0cm 53° 17°C 0mm 1.2kPa 24135m 2.7m/s 1.9m/s
11:00
6% 5.7°C 0mm 53% 0cm 63° 15°C 0mm 0.83kPa 24135m 2.5m/s 2.1m/s
12:00
8% 6.8°C 0mm 65% 0cm 69° 13°C 0mm 0.54kPa 24135m 2.4m/s 2.3m/s
13:00
9% 4.7°C 0mm 61% 0cm 66° 12°C 0mm 0.55kPa 24135m 2.4m/s 2.5m/s
14:00
10% 2.6°C 0mm 57% 0cm 58° 11°C 0mm 0.56kPa 24135m 2.3m/s 2.7m/s
15:00
11% 0.4°C 0mm 52% 0cm 47° 9.6°C 0mm 0.57kPa 24135m 2.3m/s 2.9m/s
16:00
16% -0.5°C 0mm 50% 0cm 35° 9.5°C 0mm 0.6kPa 24135m 2.2m/s 2.8m/s
17:00
21% -1.4°C 0mm 47% 0cm 22° 9.4°C 0mm 0.62kPa 24135m 2.1m/s 2.7m/s
18:00
26% -2.3°C 0mm 44% 0cm 9.5° 9.2°C 0mm 0.65kPa 24135m 2m/s 2.6m/s
19:00 ☾
23% -2.2°C 0mm 45% 0cm -2.7° 9.2°C 0mm 0.64kPa 24135m 2m/s 2.5m/s
20:00 ☾
21% -2.2°C 0mm 45% 0cm -15° 9.2°C 0mm 0.64kPa 24135m 2m/s 2.4m/s
21:00 ☾
18% -2.1°C 0mm 45% 0cm -25° 9.1°C 0mm 0.63kPa 24135m 1.9m/s 2.3m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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