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Rule Fog Hunter

Repovesi - Fog Hunter - Southern Finland

Repovesi Nationalpark, Kymenlaakso, Finland

Thick, moody fog for atmospheric forest and landscape shots

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread3.5°C
Visibility24135 (Clear)
Relative Humidity78%
Wind Speed5.4m/s (moderate winds)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki
fog weather icon
Next opportunity
Moderate Fog
Repovesi
Tomorrow · 03:00–05:00 · 2h window
Low confidence
32%
🌫️Fog Probability61.1%
Dewpoint Spread: 0.4°C
Visibility: 34 (Dense fog)
Relative Humidity: 97%
Wind Speed: 3.0m/s (calm conditions)
fog weather icon
Dense Fog
Repovesi
Tomorrow · 20:00–05:00
🌫️Fog Probability:62.5-100%
Medium
fog weather icon
Dense Fog at Sunrise
Repovesi
Tue, Mar 17 · 05:00–08:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Repovesi
Tue, Mar 17 · 08:00–11:00
🌫️Fog Probability:100%
High
fog weather icon
Dense Fog
Repovesi
Thu, Mar 19 · 02:00–05:00
🌫️Fog Probability:99.2-100%
High
fog weather icon
Dense Fog at Sunrise
Repovesi
Thu, Mar 19 · 05:00–07:00
🌫️Fog Probability:76.4-100%
High
fog weather icon
Moderate Fog
Repovesi
Thu, Mar 19 · 22:00–24:00
🌫️Fog Probability:63.9%
Low

What this forecast looks for

Plain-language explanation from the rule

Southern Finland's lake district and boreal forests create ideal conditions for fog photography. The region's 188,000 lakes, countless bogs, and mixed forests generate reliable morning mist from late summer through autumn.

What makes Southern Finland special for fog photography:

  • Lake fog - Large lakes like Vesijärvi and Saimaa produce dramatic ground fog at dawn
  • Bog mist - Torronsuo and other wetlands create ethereal low-lying fog over boardwalks
  • Forest atmosphere - Nuuksio and Repovesi offer misty woodland scenes with cliff viewpoints
  • Accessibility - Most locations within 2 hours of Helsinki

Peak fog season runs from August through October, with the strongest conditions occurring on calm, clear nights when temperatures drop near the dewpoint. Arrive before sunrise for the most dramatic mist.

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72-hour requirements breakdown

What passed or failed, hour by hour
17matching hours in the next 80 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Helsinki
Fog Probability
≥ 60.0%
Sun, Mar 15
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%
Mon, Mar 16
24:000%
01:0018%
02:000%
03:0061%
04:0061%
05:0058%
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%
19:0060%
20:00100%
21:00100%
22:0063%
23:0063%
Tue, Mar 17
24:0063%
01:0063%
02:0063%
03:00100%
04:00100%
05:00100%
06:00100%
07:00100%
08:00100%
09:00100%
10:00100%
11:000%
12:000%
13:000%
14:000%
15:000%
16:000%
17:000%
18:000%
19:000%
20:000%
21:0051%
22:0054%
23:0057%
Wed, Mar 18
24:0054%
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%
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
Europe/Helsinki
Dew Point
°C
Rainfall
mm
Relative Humidity
%
Snowfall
cm
Temperature
°C
Total Precipitation
mm
Vapor Pressure Deficit
kPa
Visibility
m
Wind Gusts
m/s
Wind Speed
m/s
Sun, Mar 15 Sunrise 06:30 Sunset 18:13
15:00
2.6°C 0mm 78% 0cm 6.1°C 0mm 0.21kPa 24135m 12m/s 5.4m/s
16:00
2.3°C 0mm 78% 0cm 5.8°C 0mm 0.2kPa 24135m 13m/s 5.1m/s
17:00
1.8°C 0mm 80% 0cm 5°C 0mm 0.18kPa 24135m 14m/s 5m/s
18:00
1.4°C 0mm 80% 0cm 4.5°C 0mm 0.16kPa 24134m 15m/s 5.1m/s
19:00 ☾
1.3°C 0mm 80% 0cm 4.5°C 0mm 0.17kPa 24134m 15m/s 5.2m/s
20:00 ☾
1.3°C 0mm 80% 0cm 4.5°C 0mm 0.17kPa 24134m 15m/s 5.1m/s
21:00 ☾
1.4°C 0mm 83% 0cm 4.1°C 0mm 0.14kPa 24134m 15m/s 4.7m/s
22:00 ☾
1.8°C 0.4mm 84% 0cm 4.3°C 0.06mm 0.14kPa 20393m 14m/s 5.2m/s
23:00 ☾
3.2°C 0.34mm 90% 0cm 4.6°C 0.5mm 0.08kPa 21303m 15m/s 5.4m/s
Mon, Mar 16 Sunrise 06:30 Sunset 18:13
24:00 ☾
3.5°C 0.09mm 92% 0cm 4.6°C 0.75mm 0.07kPa 24135m 13m/s 5.2m/s
01:00 ☾
3.5°C 0.12mm 94% 0cm 4.4°C 0.81mm 0.05kPa 24135m 12m/s 4.8m/s
02:00 ☾
3°C 0.32mm 97% 0cm 3.5°C 1.1mm 0.02kPa 99m 7.1m/s 3.9m/s
03:00 ☾
2.2°C 0.18mm 97% 0cm 2.6°C 0.31mm 0.02kPa 34m 6.2m/s 3m/s
04:00 ☾
1.7°C 0mm 97% 0cm 2.1°C 0.38mm 0.02kPa 42m 6m/s 2.5m/s
05:00 ☾
1.6°C 0mm 97% 0cm 2°C 0.38mm 0.02kPa 146m 4.9m/s 1.8m/s
06:00 ☾
0.9°C 0mm 93% 0cm 2°C 0.38mm 0.05kPa 18155m 4.7m/s 2.1m/s
07:00
0.8°C 0mm 93% 0cm 1.9°C 0.38mm 0.05kPa 21208m 4.8m/s 1.8m/s
08:00
1°C 0.02mm 93% 0cm 2.1°C 0.44mm 0.05kPa 24135m 4.7m/s 1.8m/s
09:00
0.7°C 0mm 91% 0cm 2.1°C 0mm 0.07kPa 24134m 4.5m/s 1.8m/s
10:00
0.6°C 0mm 88% 0cm 2.5°C 0mm 0.09kPa 24134m 4.4m/s 2.3m/s
11:00
-0.1°C 0mm 78% 0cm 3.4°C 0mm 0.17kPa 24135m 4m/s 2.8m/s
12:00
-0.3°C 0mm 77% 0cm 3.2°C 0mm 0.17kPa 24135m 4m/s 2.8m/s
13:00
-0.3°C 0mm 76% 0cm 3.6°C 0mm 0.19kPa 24134m 3.8m/s 2.6m/s
14:00
-0.2°C 0mm 75% 0cm 3.9°C 0mm 0.2kPa 24134m 3.5m/s 2.6m/s
15:00
-0.1°C 0mm 78% 0cm 3.5°C 0mm 0.18kPa 24134m 3.8m/s 2.7m/s
16:00
0°C 0mm 79% 0cm 3.3°C 0mm 0.16kPa 24135m 4m/s 2.6m/s
17:00
0°C 0mm 81% 0cm 3°C 0mm 0.15kPa 24134m 4.4m/s 2.6m/s
18:00
0.8°C 0mm 89% 0cm 2.5°C 0mm 0.08kPa 24135m 4.5m/s 2m/s
19:00 ☾
1.1°C 0mm 94% 0cm 2°C 0mm 0.04kPa 20293m 4.6m/s 2.1m/s
20:00 ☾
1.3°C 0.02mm 98% 0cm 1.6°C 0mm 0.02kPa 60m 4.6m/s 2m/s
21:00 ☾
1.3°C 0.09mm 99% 0.1cm 1.5°C 0.06mm 0.01kPa 24m 4.1m/s 1.6m/s
22:00 ☾
1.4°C 0.28mm 100% 0.28cm 1.4°C 0.25mm 0kPa 22m 3.8m/s 1.5m/s
23:00 ☾
1.2°C 0.31mm 100% 0.31cm 1.2°C 0.5mm 0kPa 21m 3.4m/s 1.5m/s
Tue, Mar 17 Sunrise 06:27 Sunset 18:16
24:00 ☾
1°C 0.24mm 99% 0.24cm 1.1°C 0.81mm 0kPa 21m 3.4m/s 1.5m/s
01:00 ☾
1°C 0.02mm 99% 0cm 1.1°C 0.88mm 0kPa 22m 3.1m/s 1.4m/s
02:00 ☾
0.8°C 0mm 98% 0cm 1.1°C 0.94mm 0.01kPa 24m 3.8m/s 1.4m/s
03:00 ☾
0.9°C 0mm 98% 0cm 1.2°C 0mm 0.01kPa 25m 4.2m/s 1.4m/s
04:00 ☾
0.9°C 0mm 98% 0cm 1.1°C 0mm 0.01kPa 28m 4.3m/s 1.3m/s
05:00 ☾
0.9°C 0mm 98% 0cm 1.1°C 0mm 0.01kPa 31m 4.5m/s 1.4m/s
06:00 ☾
1°C 0.01mm 98% 0cm 1.2°C 0mm 0.01kPa 39m 5.1m/s 1.6m/s
07:00
1.1°C 0.05mm 98% 0cm 1.3°C 0mm 0.01kPa 49m 5.3m/s 1.5m/s
08:00
1.1°C 0mm 98% 0cm 1.4°C 0.06mm 0.01kPa 62m 5.1m/s 1.6m/s
09:00
1.3°C 0mm 98% 0cm 1.6°C 0mm 0.02kPa 83m 5.1m/s 1.9m/s
10:00
1.3°C 0mm 96% 0cm 1.8°C 0mm 0.03kPa 642m 5m/s 2.2m/s
11:00
0.7°C 0mm 87% 0cm 2.6°C 0mm 0.1kPa 24134m 4.7m/s 2.7m/s
12:00
0.3°C 0mm 83% 0cm 3°C 0mm 0.13kPa 24134m 5m/s 2.8m/s
13:00
0.2°C 0mm 80% 0.02cm 3.3°C 0mm 0.16kPa 24134m 5.2m/s 3m/s
14:00
-0.2°C 0.01mm 76% 0cm 3.6°C 0.06mm 0.19kPa 24135m 5.2m/s 3.2m/s
15:00
-0.2°C 0mm 76% 0cm 3.6°C 0mm 0.19kPa 24135m 6m/s 2.9m/s
16:00
0.1°C 0mm 78% 0cm 3.6°C 0mm 0.17kPa 24134m 6.5m/s 2.9m/s
17:00
0.7°C 0mm 84% 0cm 3.2°C 0mm 0.13kPa 24134m 7.5m/s 3.4m/s
18:00
0.5°C 0mm 86% 0cm 2.7°C 0mm 0.11kPa 24135m 7.9m/s 3.3m/s
19:00 ☾
-0.2°C 0mm 88% 0cm 1.5°C 0mm 0.08kPa 24135m 7.9m/s 2.9m/s
20:00 ☾
-0.5°C 0mm 92% 0cm 0.58°C 0mm 0.05kPa 24134m 7.4m/s 2.5m/s
21:00 ☾
-0.8°C 0mm 94% 0cm -0.004°C 0mm 0.04kPa 22143m 8.2m/s 2.6m/s
22:00 ☾
-1.1°C 0mm 96% 0cm -0.59°C 0mm 0.02kPa 20152m 8.9m/s 2.7m/s
23:00 ☾
-1.5°C 0mm 98% 0cm -1.2°C 0mm 0.01kPa 18160m 9.7m/s 2.9m/s
Wed, Mar 18 Sunrise 06:24 Sunset 18:19
24:00 ☾
-1.3°C 0mm 95% 0cm -0.68°C 0mm 0.03kPa 20152m 10m/s 3.1m/s
01:00 ☾
-1.2°C 0mm 93% 0cm -0.19°C 0mm 0.04kPa 22144m 11m/s 3.4m/s
02:00 ☾
-1°C 0mm 91% 0cm 0.3°C 0mm 0.06kPa 24135m 12m/s 3.7m/s
03:00 ☾
-0.7°C 0mm 86% 0cm 1.3°C 0mm 0.09kPa 24135m 12m/s 4m/s
04:00 ☾
-0.4°C 0mm 82% 0cm 2.3°C 0mm 0.13kPa 24135m 12m/s 4.4m/s
05:00 ☾
-0.2°C 0mm 78% 0cm 3.3°C 0mm 0.17kPa 24135m 13m/s 4.7m/s
06:00 ☾
0.1°C 0mm 78% 0cm 3.6°C 0mm 0.18kPa 24135m 13m/s 4.9m/s
07:00
0.3°C 0mm 78% 0cm 3.9°C 0mm 0.18kPa 24135m 14m/s 5.2m/s
08:00
0.6°C 0mm 78% 0cm 4.2°C 0mm 0.18kPa 24135m 14m/s 5.4m/s
09:00
0.9°C 0mm 79% 0cm 4.1°C 0mm 0.17kPa 24135m 14m/s 5.5m/s
10:00
1.1°C 0mm 81% 0cm 4.1°C 0mm 0.16kPa 24135m 14m/s 5.6m/s
11:00
1.3°C 0mm 82% 0cm 4°C 0mm 0.14kPa 24135m 15m/s 5.8m/s
12:00
1.5°C 0mm 85% 0cm 3.8°C 0mm 0.12kPa 24135m 15m/s 5.7m/s
13:00
1.7°C 0mm 87% 0cm 3.6°C 0mm 0.1kPa 24135m 15m/s 5.6m/s
14:00
1.8°C 0mm 90% 0cm 3.4°C 0mm 0.08kPa 24135m 15m/s 5.5m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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