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Rule Fog Hunter

Fog Hunter Forecast for Porvoo, Southern Finland

Porvoo, Uusimaa, Finland

Porvoo’s red riverside warehouses, timber old town, and cathedral hill reflect in the Porvoonjoki under calm blue-hour or misty conditions.

Currently

Real-time conditions
Fog Probability
0%
Dewpoint Spread2.6°C
Visibility24135 (Clear)
Relative Humidity85%
Wind Speed3.9m/s (calm conditions)

Upcoming Opportunities

When all conditions match, PhotoWeather marks an opportunity window.

Times shown in Europe/Helsinki
fog weather icon
Next opportunity
Fog Potential
Porvoo
Tue, Jul 28 · 24:00–02:00 · 2h window
Low confidence
24%
🌫️Fog Probability75.8%
Dewpoint Spread: 0.1°C
Visibility: 24134 (Clear)
Relative Humidity: 99%
Wind Speed: 1.4m/s (calm conditions)

How this forecast is evaluated

See which weather signals PhotoWeather uses to identify Fog Hunter conditions across Southern Finland. The requirements and hourly values below show how those signals apply at Porvoo.

Explore Fog Hunter conditions across Southern Finland →

Recorded match history

Completed PhotoWeather forecast matches recorded for this exact rule at Porvoo during the last 365 days.

Last 30 days
1
recorded matching window · 100% average confidence
Last 90 days
10
recorded matching windows · 79% average confidence
Last 365 days
10
recorded matching windows · 79% average confidence
Most represented month

June, with 6 of 10 matches recorded in the last 365 days.

These figures use completed PhotoWeather MatchEvent records from the previous 365 days only. They describe recorded forecast matches, not observations, climatological probability, or a guarantee of future conditions.

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92-hour requirements breakdown

When available, the detailed table below covers only the stated 92-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the next 14 days, so this table does not explain that entire 14-day period.

What passed or failed, hour by hour
2matching hours in the next 92 hoursJump to next match
AND logic: all conditions required
Meets requirement
Misses requirement
Time
Europe/Helsinki
Fog Probability
≥ 75.0%
Sat, Jul 25
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%
Sun, Jul 26
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%
21:0026%
22:000%
23:0026%
Mon, Jul 27
24:000%
01:0025%
02:0026%
03:0039%
04:0073%
05:0071%
06:0071%
07:0071%
08:0027%
09:0027%
10:0049%
11:0051%
12:0031%
13:000%
14:000%
15:000%
16:0044%
17:0024%
18:000%
19:000%
20:000%
21:000%
22:0073%
23:0073%
Tue, Jul 28
24:0076%
01:0076%
02:0042%
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%
Wed, Jul 29
24:000%
01:000%
02:000%
03:000%
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
Sun, Jul 26 Sunrise 04:41 Sunset 22:04
05:00
0% 13°C 0mm 85% 0cm 1.3° 15°C 0mm 0.26kPa 24135m 11m/s 3.9m/s
06:00
0% 13°C 0mm 85% 0cm 7.2° 16°C 0mm 0.27kPa 24135m 10m/s 4.1m/s
07:00
0% 14°C 0.01mm 85% 0cm 14° 16°C 0mm 0.27kPa 24135m 10m/s 4.4m/s
08:00
0% 14°C 0mm 87% 0cm 21° 16°C 0.06mm 0.23kPa 24135m 11m/s 4.5m/s
09:00
0% 14°C 0.11mm 90% 0cm 29° 16°C 0.13mm 0.19kPa 24134m 11m/s 4.6m/s
10:00
0% 14°C 0mm 88% 0cm 36° 16°C 0mm 0.21kPa 24134m 11m/s 4.8m/s
11:00
0% 14°C 0.01mm 80% 0cm 42° 17°C 0.06mm 0.39kPa 24135m 11m/s 4.9m/s
12:00
0% 14°C 0.13mm 84% 0cm 46° 17°C 0.25mm 0.31kPa 17577m 10m/s 5m/s
13:00
0% 14°C 0.04mm 89% 0cm 49° 16°C 0.44mm 0.2kPa 24134m 9.9m/s 4m/s
14:00
0% 15°C 0.02mm 89% 0cm 48° 16°C 0.5mm 0.2kPa 24134m 11m/s 4.4m/s
15:00
0% 14°C 0mm 87% 0cm 46° 17°C 0.5mm 0.24kPa 24134m 11m/s 3.7m/s
16:00
0% 14°C 0mm 77% 0cm 41° 18°C 0mm 0.48kPa 24134m 12m/s 4.6m/s
17:00
0% 14°C 0mm 75% 0cm 34° 18°C 0.13mm 0.54kPa 24135m 11m/s 4m/s
18:00
0% 14°C 0.11mm 75% 0cm 27° 18°C 0.25mm 0.53kPa 24135m 12m/s 4.5m/s
19:00
0% 15°C 0.46mm 90% 0cm 20° 16°C 0.63mm 0.19kPa 18257m 12m/s 4.5m/s
20:00
0% 15°C 0.07mm 94% 0cm 12° 16°C 0.88mm 0.1kPa 24135m 11m/s 2.9m/s
21:00
0% 15°C 0.01mm 96% 0cm 5.7° 16°C 0.88mm 0.07kPa 24134m 9.6m/s 2.4m/s
22:00
1% 15°C 0.17mm 94% 0cm 0.18° 16°C 0.13mm 0.1kPa 22631m 10m/s 2.8m/s
23:00 ☾
1% 15°C 0.16mm 95% 0cm -5.1° 16°C 0.38mm 0.08kPa 24134m 9.8m/s 2.6m/s
Mon, Jul 27 Sunrise 04:41 Sunset 22:04
24:00 ☾
2% 15°C 0mm 95% 0cm -8.5° 16°C 0.44mm 0.09kPa 24135m 10m/s 3m/s
01:00 ☾
2% 15°C 0mm 95% 0cm -10° 16°C 0.44mm 0.09kPa 24134m 9.2m/s 2.7m/s
02:00 ☾
1% 15°C 0mm 96% 0cm -10° 15°C 0.44mm 0.07kPa 24135m 7.6m/s 1.9m/s
03:00 ☾
1% 14°C 0mm 98% 0cm -8° 14°C 0.44mm 0.04kPa 24134m 6.7m/s 1.8m/s
04:00 ☾
2% 14°C 0mm 98% 0cm -4.3° 14°C 0mm 0.03kPa 24135m 5.8m/s 1.7m/s
05:00
2% 14°C 0mm 98% 0cm 1.1° 15°C 0mm 0.04kPa 24135m 4.7m/s 1.6m/s
06:00
3% 15°C 0.01mm 97% 0cm 7° 15°C 0mm 0.05kPa 24135m 4.6m/s 1.5m/s
07:00
2% 15°C 0mm 98% 0cm 14° 15°C 0mm 0.04kPa 24134m 5.2m/s 1.7m/s
08:00
1% 16°C 0.23mm 97% 0cm 21° 16°C 0.06mm 0.06kPa 21431m 6.6m/s 2.1m/s
09:00
0% 16°C 0.07mm 98% 0cm 28° 16°C 0.44mm 0.04kPa 24134m 7.6m/s 2.4m/s
10:00
1% 15°C 0.12mm 97% 0cm 35° 16°C 0.13mm 0.05kPa 24135m 7.3m/s 2.2m/s
11:00
1% 15°C 0.04mm 98% 0cm 42° 16°C 0.19mm 0.03kPa 24135m 7.4m/s 2.4m/s
12:00
2% 16°C 0.52mm 97% 0cm 46° 16°C 0.69mm 0.05kPa 17596m 6.9m/s 2.6m/s
13:00
1% 16°C 0.14mm 96% 0cm 49° 16°C 1mm 0.08kPa 24134m 6.4m/s 2.6m/s
14:00
1% 16°C 0mm 91% 0cm 48° 17°C 1.1mm 0.17kPa 22587m 5.9m/s 3m/s
15:00
0% 16°C 0.07mm 88% 0cm 45° 18°C 1.3mm 0.24kPa 16511m 5.8m/s 3.6m/s
16:00
0% 15°C 0.04mm 97% 0cm 40° 16°C 0.19mm 0.06kPa 24135m 4.4m/s 1.9m/s
17:00
0% 15°C 0.01mm 96% 0cm 34° 16°C 0.25mm 0.07kPa 24135m 3.9m/s 1.5m/s
18:00
0% 16°C 1.8mm 97% 0cm 27° 16°C 0.81mm 0.06kPa 7538m 1.8m/s 0.54m/s
19:00
0% 16°C 0.01mm 98% 0cm 20° 16°C 1.4mm 0.04kPa 24135m 1.9m/s 1.1m/s
20:00
0% 16°C 0mm 95% 0cm 12° 16°C 1.4mm 0.09kPa 24134m 0.7m/s 0.61m/s
21:00
0% 16°C 0mm 98% 0cm 5.6° 16°C 1.4mm 0.04kPa 24135m 0.41m/s 0.38m/s
22:00
0% 15°C 0.01mm 99% 0cm 0.004° 15°C 0mm 0.02kPa 24134m 0.71m/s 0.71m/s
23:00 ☾
0% 15°C 0.02mm 99% 0cm -5.3° 15°C 0.06mm 0.02kPa 24134m 1m/s 0.93m/s
Tue, Jul 28 Sunrise 04:43 Sunset 22:02
24:00 ☾
0% 15°C 0mm 99% 0cm -8.7° 15°C 0.06mm 0.02kPa 24134m 1.8m/s 1.4m/s
01:00 ☾
0% 15°C 0.07mm 99% 0cm -10° 15°C 0.13mm 0.02kPa 24031m 3m/s 1.5m/s
02:00 ☾
0% 15°C 0.52mm 99% 0cm -10° 15°C 0.69mm 0.01kPa 12121m 4.6m/s 1.7m/s
03:00 ☾
0% 15°C 5.7mm 100% 0cm -8.2° 15°C 4mm 0.01kPa 2622m 4m/s 1.1m/s
04:00 ☾
1% 15°C 6.6mm 100% 0cm -4.5° 15°C 6.5mm 0.01kPa 341m 4.3m/s 2.6m/s
05:00
2% 14°C 10mm 98% 0cm 0.92° 14°C 17mm 0.03kPa 461m 9.6m/s 4.6m/s
06:00
3% 13°C 2.1mm 97% 0cm 6.8° 14°C 22mm 0.04kPa 7753m 11m/s 5m/s
07:00
3% 13°C 0.57mm 97% 0cm 14° 13°C 24mm 0.04kPa 17372m 12m/s 5.6m/s
08:00
4% 12°C 0.52mm 97% 0cm 21° 12°C 24mm 0.05kPa 18456m 13m/s 5.9m/s
09:00
4% 12°C 0.13mm 96% 0cm 28° 12°C 25mm 0.05kPa 24134m 14m/s 5.4m/s
10:00
10% 12°C 0.11mm 94% 0cm 35° 13°C 17mm 0.1kPa 24134m 13m/s 5.3m/s
11:00
16% 13°C 0.08mm 91% 0cm 41° 14°C 8.9mm 0.15kPa 24135m 12m/s 5.3m/s
12:00
22% 14°C 0.06mm 88% 0cm 46° 15°C 1mm 0.2kPa 24135m 11m/s 5.3m/s
13:00
21% 13°C 0.27mm 90% 0cm 48° 15°C 1.3mm 0.17kPa 21299m 12m/s 5.4m/s
14:00
19% 13°C 0.47mm 92% 0cm 48° 14°C 1.6mm 0.13kPa 18463m 13m/s 5.5m/s
15:00
18% 12°C 0.68mm 93% 0cm 45° 13°C 1.9mm 0.1kPa 15627m 13m/s 5.6m/s
16:00
19% 12°C 0.79mm 94% 0cm 40° 13°C 2.3mm 0.09kPa 14535m 14m/s 5.8m/s
17:00
20% 12°C 0.89mm 95% 0cm 34° 13°C 2.8mm 0.08kPa 13444m 14m/s 6m/s
18:00
21% 12°C 1mm 95% 0cm 27° 13°C 3.2mm 0.07kPa 12352m 15m/s 6.2m/s
19:00
20% 12°C 1.6mm 95% 0cm 19° 13°C 4.6mm 0.07kPa 10054m 15m/s 6.1m/s
20:00
18% 12°C 2.2mm 95% 0cm 12° 13°C 6mm 0.07kPa 7756m 15m/s 6m/s
21:00
17% 12°C 2.8mm 95% 0cm 5.3° 12°C 7.4mm 0.07kPa 5458m 15m/s 5.8m/s
22:00
21% 12°C 2.1mm 95% 0cm -0.37° 12°C 6.4mm 0.07kPa 11417m 15m/s 6m/s
23:00 ☾
24% 12°C 1.3mm 94% 0cm -5.6° 12°C 5.4mm 0.08kPa 17376m 15m/s 6.3m/s
Wed, Jul 29 Sunrise 04:46 Sunset 22:00
24:00 ☾
28% 12°C 0.59mm 94% 0cm -9° 12°C 4.3mm 0.08kPa 23334m 16m/s 6.5m/s
01:00 ☾
29% 12°C 0.43mm 94% 0cm -11° 12°C 5mm 0.08kPa 23601m 15m/s 6.3m/s
02:00 ☾
30% 12°C 0.27mm 94% 0cm -10° 12°C 5.7mm 0.08kPa 23868m 15m/s 6.1m/s
03:00 ☾
31% 12°C 0.11mm 95% 0cm -8.4° 13°C 6.4mm 0.08kPa 24135m 14m/s 6m/s
04:00 ☾
33% 12°C 0.4mm 95% 0cm -4.7° 12°C 5.1mm 0.07kPa 21074m 14m/s 5.7m/s
How to read: these inputs help produce the derived score; they are not requirements by themselves.

How this forecast is made

Opportunities are threshold-based signals: PhotoWeather checks whether forecast conditions match the rules for a photography scenario. They are planning guidance, not guarantees. Forecasts can change as new model runs arrive, and confidence generally decreases farther into the forecast horizon, so recheck conditions before travelling.

The weather forecast foundation comes through Open-Meteo , which aggregates models from weather agencies. PhotoWeather applies condition-specific thresholds and derived calculations; not every condition uses every model or data input.

How opportunities work → Weather data sources →
Forecast generated

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