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Rule Fog Hunter

Porvoo - Fog Hunter - Southern Finland

Porvoo, Uusimaa, Finland

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 · ≥ 60.0%

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 Spread5.2°C
Visibility24134 (Clear)
Relative Humidity69%
Wind Speed2.4m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki

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

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
0matching hours in the next 92 hours
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Helsinki
Fog Probability
≥ 60.0%
Tue, Apr 21
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, Apr 22
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%
Thu, Apr 23
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, Apr 24
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%
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16:000%
17:000%
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20:000%
21:000%
22:000%
23:000%
Sat, Apr 25
24:000%
01:000%
02:000%
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
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, Apr 22 Sunrise 05:39 Sunset 20:53
05:00 ☾
87% -0.4°C 0mm 69% 0cm -4.9° 4.8°C 0mm 0.27kPa 24134m 8.2m/s 2.4m/s
06:00
96% -0.7°C 0mm 70% 0cm 1.8° 4.2°C 0mm 0.25kPa 24134m 8.5m/s 2.4m/s
07:00
82% -0.8°C 0mm 63% 0cm 8.7° 5.8°C 0mm 0.34kPa 24135m 11m/s 3m/s
08:00
68% -0.1°C 0mm 57% 0cm 16° 7.9°C 0mm 0.45kPa 24134m 12m/s 3.6m/s
09:00
54% 0.2°C 0mm 53% 0cm 23° 9.3°C 0mm 0.55kPa 24134m 9.5m/s 4.8m/s
10:00
36% 0.2°C 0mm 53% 0cm 30° 9.2°C 0mm 0.54kPa 24134m 9.5m/s 4.7m/s
11:00
18% -0.1°C 0mm 53% 0cm 36° 9°C 0mm 0.54kPa 24134m 8.8m/s 4.9m/s
12:00
0% -0.4°C 0mm 50% 0cm 40° 9.5°C 0mm 0.6kPa 24134m 8.9m/s 5m/s
13:00
0% -0.8°C 0mm 43% 0cm 42° 11°C 0mm 0.77kPa 24134m 9m/s 5.6m/s
14:00
0% -1.1°C 0mm 39% 0cm 41° 12°C 0mm 0.88kPa 24135m 9.5m/s 5.7m/s
15:00
0% -1.3°C 0mm 36% 0cm 38° 14°C 0mm 1kPa 24135m 9.1m/s 5.9m/s
16:00
1% -1.4°C 0mm 35% 0cm 33° 14°C 0mm 1kPa 24135m 8.9m/s 5.8m/s
17:00
3% -0.9°C 0mm 39% 0cm 27° 13°C 0mm 0.89kPa 24134m 9.6m/s 4.9m/s
18:00
4% -0.1°C 0mm 43% 0cm 20° 12°C 0mm 0.8kPa 24135m 11m/s 5.1m/s
19:00
3% 0.2°C 0mm 46% 0cm 13° 11°C 0.06mm 0.72kPa 23502m 12m/s 5.5m/s
20:00
3% -0.4°C 0mm 49% 0cm 5.5° 9.7°C 0.13mm 0.61kPa 24134m 12m/s 6.2m/s
21:00 ☾
2% -2.4°C 0mm 47% 0cm -1.2° 8.3°C 0.13mm 0.58kPa 24134m 15m/s 6.2m/s
22:00 ☾
28% -4.4°C 0mm 44% 0cm -7.4° 7.1°C 0mm 0.57kPa 24134m 14m/s 6.1m/s
23:00 ☾
55% -6.4°C 0mm 41% 0cm -12° 5.7°C 0mm 0.54kPa 24134m 16m/s 5.6m/s
Thu, Apr 23 Sunrise 05:39 Sunset 20:53
24:00 ☾
81% -7.3°C 0mm 42% 0cm -16° 4.5°C 0mm 0.49kPa 24134m 11m/s 5.9m/s
01:00 ☾
84% -9.4°C 0mm 41% 0cm -17° 2.4°C 0mm 0.42kPa 24134m 11m/s 5.6m/s
02:00 ☾
87% -9.1°C 0mm 45% 0cm -17° 1.6°C 0mm 0.38kPa 24134m 11m/s 5.5m/s
03:00 ☾
90% -9°C 0mm 46% 0cm -14° 1.3°C 0mm 0.36kPa 24135m 11m/s 5.3m/s
04:00 ☾
90% -8.2°C 0mm 51% 0cm -10° 0.78°C 0mm 0.32kPa 24134m 11m/s 5.2m/s
05:00 ☾
90% -8.6°C 0mm 52% 0cm -4.6° 0.19°C 0mm 0.3kPa 24134m 11m/s 5.4m/s
06:00
90% -8.7°C 0mm 54% 0cm 2.1° -0.46°C 0mm 0.27kPa 24134m 11m/s 5.5m/s
07:00
89% -8.5°C 0mm 53% 0cm 9° -0.17°C 0mm 0.28kPa 24135m 12m/s 5.4m/s
08:00
89% -8°C 0mm 52% 0cm 16° 0.89°C 0mm 0.32kPa 24134m 12m/s 5.6m/s
09:00
88% -8.3°C 0mm 48% 0cm 24° 1.4°C 0mm 0.35kPa 24134m 11m/s 6.2m/s
10:00
81% -9.3°C 0mm 42% 0cm 30° 2.4°C 0mm 0.42kPa 24135m 11m/s 6.4m/s
11:00
75% -9.6°C 0mm 37% 0cm 36° 3.6°C 0mm 0.5kPa 24135m 10m/s 6.1m/s
12:00
68% -9.7°C 0mm 34% 0cm 40° 4.9°C 0mm 0.57kPa 24134m 10m/s 6m/s
13:00
60% -9.6°C 0mm 32% 0cm 42° 6°C 0mm 0.64kPa 24135m 10m/s 6.2m/s
14:00
53% -9.3°C 0mm 30% 0cm 42° 6.9°C 0mm 0.69kPa 24134m 11m/s 6.5m/s
15:00
45% -9°C 0mm 30% 0cm 39° 7.7°C 0mm 0.74kPa 24134m 11m/s 6.5m/s
16:00
36% -8.7°C 0mm 30% 0cm 34° 8°C 0mm 0.75kPa 24134m 11m/s 6.3m/s
17:00
28% -8.2°C 0mm 30% 0cm 27° 8.5°C 0mm 0.78kPa 24134m 11m/s 6m/s
18:00
19% -7.3°C 0mm 31% 0cm 20° 8.7°C 0mm 0.77kPa 24134m 10m/s 5.2m/s
19:00
15% -6.8°C 0mm 35% 0cm 13° 7.9°C 0mm 0.7kPa 24135m 9.7m/s 4.8m/s
20:00
12% -6.1°C 0mm 39% 0cm 5.8° 6.9°C 0mm 0.6kPa 24135m 9m/s 4.6m/s
21:00 ☾
8% -5.3°C 0mm 46% 0cm -0.9° 5.6°C 0mm 0.49kPa 24135m 8.4m/s 3.6m/s
22:00 ☾
8% -4.6°C 0mm 51% 0cm -7.1° 4.7°C 0mm 0.42kPa 24135m 8.3m/s 3.1m/s
23:00 ☾
9% -4.2°C 0mm 56% 0cm -12° 3.8°C 0mm 0.36kPa 24134m 8.9m/s 2.9m/s
Fri, Apr 24 Sunrise 05:36 Sunset 20:56
24:00 ☾
9% -4°C 0mm 59% 0cm -15° 3.2°C 0mm 0.31kPa 24134m 9m/s 2.8m/s
01:00 ☾
9% -3.8°C 0mm 63% 0cm -17° 2.6°C 0mm 0.27kPa 24135m 8.6m/s 2.5m/s
02:00 ☾
9% -3.7°C 0mm 66% 0cm -16° 2°C 0mm 0.24kPa 24135m 9m/s 2.6m/s
03:00 ☾
9% -3.7°C 0mm 68% 0cm -14° 1.6°C 0mm 0.22kPa 24135m 9.3m/s 2.7m/s
04:00 ☾
18% -3.5°C 0mm 70% 0cm -9.8° 1.3°C 0mm 0.2kPa 24135m 9.4m/s 2.8m/s
05:00 ☾
27% -3.5°C 0mm 72% 0cm -4.3° 0.99°C 0mm 0.18kPa 24135m 8.8m/s 2.5m/s
06:00
36% -3.5°C 0mm 77% 0cm 2.4° 0.05°C 0mm 0.14kPa 24134m 7.9m/s 2.2m/s
07:00
38% -3.4°C 0mm 70% 0cm 9.3° 1.4°C 0mm 0.2kPa 24135m 8m/s 2.4m/s
08:00
39% -3.8°C 0mm 59% 0cm 17° 3.4°C 0mm 0.32kPa 24134m 6.7m/s 3m/s
09:00
41% -4.1°C 0mm 52% 0cm 24° 5°C 0mm 0.42kPa 24134m 6.1m/s 3.3m/s
10:00
48% -4.3°C 0mm 44% 0cm 31° 7.1°C 0mm 0.56kPa 24134m 5.4m/s 3.3m/s
11:00
56% -5°C 0mm 36% 0cm 36° 9.2°C 0mm 0.74kPa 24135m 4.8m/s 3.3m/s
12:00
63% -6.3°C 0mm 29% 0cm 41° 11°C 0mm 0.95kPa 24135m 4.1m/s 3.2m/s
13:00
60% -5.8°C 0mm 33% 0cm 42° 9.8°C 0mm 0.81kPa 24135m 3.2m/s 2.6m/s
14:00
56% -5.4°C 0mm 37% 0cm 42° 8.4°C 0mm 0.69kPa 24135m 2.2m/s 1.9m/s
15:00
53% -5.3°C 0mm 41% 0cm 39° 6.9°C 0mm 0.58kPa 24135m 1.3m/s 1.2m/s
16:00
47% -5.2°C 0mm 43% 0cm 34° 6.5°C 0mm 0.55kPa 24135m 1.4m/s 1.4m/s
17:00
40% -5.1°C 0mm 44% 0cm 28° 6.2°C 0mm 0.53kPa 24135m 1.4m/s 1.5m/s
18:00
34% -5°C 0mm 46% 0cm 21° 5.8°C 0mm 0.5kPa 24135m 1.5m/s 1.6m/s
19:00
31% -4.3°C 0mm 49% 0cm 13° 5.7°C 0mm 0.47kPa 24135m 2.5m/s 1.6m/s
20:00
27% -3.6°C 0mm 52% 0cm 6.1° 5.5°C 0mm 0.44kPa 24135m 3.5m/s 1.7m/s
21:00 ☾
24% -3°C 0mm 55% 0cm -0.54° 5.4°C 0mm 0.41kPa 24135m 4.5m/s 1.7m/s
22:00 ☾
24% -2.1°C 0mm 60% 0cm -6.9° 5.1°C 0mm 0.35kPa 24135m 5.6m/s 1.9m/s
23:00 ☾
24% -1.3°C 0mm 65% 0cm -12° 4.7°C 0mm 0.3kPa 24135m 6.8m/s 2.1m/s
Sat, Apr 25 Sunrise 05:33 Sunset 20:58
24:00 ☾
24% -0.6°C 0mm 70% 0cm -15° 4.4°C 0mm 0.25kPa 24135m 8m/s 2.3m/s
01:00 ☾
19% -0.3°C 0mm 66% 0cm -16° 5.6°C 0mm 0.31kPa 24135m 7.6m/s 2.7m/s
02:00 ☾
14% -0.1°C 0mm 62% 0cm -16° 6.8°C 0mm 0.38kPa 24135m 7.3m/s 3.1m/s
03:00 ☾
9% 0°C 0mm 57% 0cm -14° 8°C 0mm 0.46kPa 24135m 6.9m/s 3.5m/s
04:00 ☾
7% -0.4°C 0mm 52% 0cm -9.4° 8.9°C 0mm 0.54kPa 24135m 7.2m/s 3.8m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

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