Rule
Mirror Lake
Mirror Lake 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.
0 matching opportunities in the 14-day forecast.
Upcoming Opportunities
When all conditions match, PhotoWeather marks an opportunity window.
Times shown in Europe/Helsinki
No matching opportunities in this 14-day forecast
See which requirements block the most forecast hours below.
72-hour requirements breakdown
When available, this detailed table covers only the stated 72-hour horizon (typically 72–168 hours, depending on available hourly data). Opportunity records above span the full 14-day forecast period, so this table does not explain that entire period. Times shown in Europe/Helsinki.
Most common blockers
Ranked across the 72-hour forecast horizon, not the full opportunity period.
- Wind Speed97% of hours
- Wind Gusts97% of hours
- Precipitation Chance26% of hours
0matching hours in the displayed 72-hour forecast
AND logic: all conditions required
Meets requirement
Misses requirement
Time Europe/Helsinki | Wind Speed ≤ 1.0m/s | Wind Gusts ≤ 2.0m/s | Precipitation Chance ≤ 10.0% | Visibility ≥ 5000.0m |
|---|---|---|---|---|
| Sun, Sep 20 | ||||
| Rule fails. 08:00 | Wind Speed: 5.1m/s. Misses requirement | Wind Gusts: 11m/s. Misses requirement | Precipitation Chance: 30%. Misses requirement | Visibility: 50800m. Meets requirement |
| Rule fails. 09:00 | Wind Speed: 6m/s. Misses requirement | Wind Gusts: 12m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 54880m. Meets requirement |
| Rule fails. 10:00 | Wind Speed: 5.9m/s. Misses requirement | Wind Gusts: 11m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 54900m. Meets requirement |
| Rule fails. 11:00 | Wind Speed: 5.3m/s. Misses requirement | Wind Gusts: 11m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 58160m. Meets requirement |
| Rule fails. 12:00 | Wind Speed: 4.9m/s. Misses requirement | Wind Gusts: 10m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 58160m. Meets requirement |
| Rule fails. 13:00 | Wind Speed: 5.3m/s. Misses requirement | Wind Gusts: 10m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 61000m. Meets requirement |
| Rule fails. 14:00 | Wind Speed: 6.1m/s. Misses requirement | Wind Gusts: 12m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 60980m. Meets requirement |
| Rule fails. 15:00 | Wind Speed: 6.4m/s. Misses requirement | Wind Gusts: 12m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 60960m. Meets requirement |
| Rule fails. 16:00 | Wind Speed: 6.4m/s. Misses requirement | Wind Gusts: 12m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 58120m. Meets requirement |
| Rule fails. 17:00 | Wind Speed: 5.8m/s. Misses requirement | Wind Gusts: 12m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 39920m. Meets requirement |
| Rule fails. 18:00 | Wind Speed: 5.3m/s. Misses requirement | Wind Gusts: 11m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 31280m. Meets requirement |
| Rule fails. 19:00 | Wind Speed: 4.8m/s. Misses requirement | Wind Gusts: 9.5m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 42860m. Meets requirement |
| Rule fails. 20:00 | Wind Speed: 2.8m/s. Misses requirement | Wind Gusts: 8.5m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 53300m. Meets requirement |
| Rule fails. 21:00 | Wind Speed: 2.5m/s. Misses requirement | Wind Gusts: 4.9m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 50800m. Meets requirement |
| Rule fails. 22:00 | Wind Speed: 2.4m/s. Misses requirement | Wind Gusts: 4.2m/s. Misses requirement | Precipitation Chance: 1%. Meets requirement | Visibility: 42420m. Meets requirement |
| Rule fails. 23:00 | Wind Speed: 2.4m/s. Misses requirement | Wind Gusts: 4.1m/s. Misses requirement | Precipitation Chance: 3%. Meets requirement | Visibility: 34280m. Meets requirement |
| Mon, Sep 21 | ||||
| Rule fails. 24:00 | Wind Speed: 2.5m/s. Misses requirement | Wind Gusts: 4.5m/s. Misses requirement | Precipitation Chance: 6%. Meets requirement | Visibility: 45080m. Meets requirement |
| Rule fails. 01:00 | Wind Speed: 2.1m/s. Misses requirement | Wind Gusts: 4.5m/s. Misses requirement | Precipitation Chance: 13%. Misses requirement | Visibility: 34500m. Meets requirement |
| Rule fails. 02:00 | Wind Speed: 2.7m/s. Misses requirement | Wind Gusts: 4.8m/s. Misses requirement | Precipitation Chance: 22%. Misses requirement | Visibility: 38000m. Meets requirement |
| Rule fails. 03:00 | Wind Speed: 5.3m/s. Misses requirement | Wind Gusts: 11m/s. Misses requirement | Precipitation Chance: 27%. Misses requirement | Visibility: 35660m. Meets requirement |
| Rule fails. 04:00 | Wind Speed: 2m/s. Misses requirement | Wind Gusts: 8.7m/s. Misses requirement | Precipitation Chance: 25%. Misses requirement | Visibility: 27360m. Meets requirement |
| Rule fails. 05:00 | Wind Speed: 1.7m/s. Misses requirement | Wind Gusts: 5.3m/s. Misses requirement | Precipitation Chance: 19%. Misses requirement | Visibility: 29900m. Meets requirement |
| Rule fails. 06:00 | Wind Speed: 1.7m/s. Misses requirement | Wind Gusts: 3m/s. Misses requirement | Precipitation Chance: 14%. Misses requirement | Visibility: 28500m. Meets requirement |
| Rule fails. 07:00 | Wind Speed: 1.6m/s. Misses requirement | Wind Gusts: 3.5m/s. Misses requirement | Precipitation Chance: 13%. Misses requirement | Visibility: 26780m. Meets requirement |
| Rule fails. 08:00 | Wind Speed: 0.8m/s. Meets requirement | Wind Gusts: 3.1m/s. Misses requirement | Precipitation Chance: 12%. Misses requirement | Visibility: 280m. Misses requirement |
| Rule fails. 09:00 | Wind Speed: 0.6m/s. Meets requirement | Wind Gusts: 1.6m/s. Meets requirement | Precipitation Chance: 12%. Misses requirement | Visibility: 1140m. Misses requirement |
| Rule fails. 10:00 | Wind Speed: 1.3m/s. Misses requirement | Wind Gusts: 3m/s. Misses requirement | Precipitation Chance: 10%. Meets requirement | Visibility: 16820m. Meets requirement |
| Rule fails. 11:00 | Wind Speed: 1.9m/s. Misses requirement | Wind Gusts: 4.4m/s. Misses requirement | Precipitation Chance: 8%. Meets requirement | Visibility: 21820m. Meets requirement |
| Rule fails. 12:00 | Wind Speed: 2m/s. Misses requirement | Wind Gusts: 4.6m/s. Misses requirement | Precipitation Chance: 8%. Meets requirement | Visibility: 24260m. Meets requirement |
| Rule fails. 13:00 | Wind Speed: 2.1m/s. Misses requirement | Wind Gusts: 4.9m/s. Misses requirement | Precipitation Chance: 12%. Misses requirement | Visibility: 28000m. Meets requirement |
| Rule fails. 14:00 | Wind Speed: 2.3m/s. Misses requirement | Wind Gusts: 5.2m/s. Misses requirement | Precipitation Chance: 17%. Misses requirement | Visibility: 37660m. Meets requirement |
| Rule fails. 15:00 | Wind Speed: 2.6m/s. Misses requirement | Wind Gusts: 5.6m/s. Misses requirement | Precipitation Chance: 22%. Misses requirement | Visibility: 20500m. Meets requirement |
| Rule fails. 16:00 | Wind Speed: 2.4m/s. Misses requirement | Wind Gusts: 5.8m/s. Misses requirement | Precipitation Chance: 26%. Misses requirement | Visibility: 60760m. Meets requirement |
| Rule fails. 17:00 | Wind Speed: 2.2m/s. Misses requirement | Wind Gusts: 5m/s. Misses requirement | Precipitation Chance: 30%. Misses requirement | Visibility: 60760m. Meets requirement |
| Rule fails. 18:00 | Wind Speed: 1.4m/s. Misses requirement | Wind Gusts: 4.4m/s. Misses requirement | Precipitation Chance: 31%. Misses requirement | Visibility: 60780m. Meets requirement |
| Rule fails. 19:00 | Wind Speed: 1.2m/s. Misses requirement | Wind Gusts: 2.8m/s. Misses requirement | Precipitation Chance: 26%. Misses requirement | Visibility: 57960m. Meets requirement |
| Rule fails. 20:00 | Wind Speed: 1.1m/s. Misses requirement | Wind Gusts: 2m/s. Meets requirement | Precipitation Chance: 19%. Misses requirement | Visibility: 54700m. Meets requirement |
| Rule fails. 21:00 | Wind Speed: 1.5m/s. Misses requirement | Wind Gusts: 2.3m/s. Misses requirement | Precipitation Chance: 12%. Misses requirement | Visibility: 50680m. Meets requirement |
| Rule fails. 22:00 | Wind Speed: 2.3m/s. Misses requirement | Wind Gusts: 3.9m/s. Misses requirement | Precipitation Chance: 7%. Meets requirement | Visibility: 50680m. Meets requirement |
| Rule fails. 23:00 | Wind Speed: 2m/s. Misses requirement | Wind Gusts: 3.9m/s. Misses requirement | Precipitation Chance: 3%. Meets requirement | Visibility: 46380m. Meets requirement |
| Tue, Sep 22 | ||||
| Rule fails. 24:00 | Wind Speed: 2.5m/s. Misses requirement | Wind Gusts: 4.3m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 46400m. Meets requirement |
| Rule fails. 01:00 | Wind Speed: 2.7m/s. Misses requirement | Wind Gusts: 4.6m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 46400m. Meets requirement |
| Rule fails. 02:00 | Wind Speed: 3m/s. Misses requirement | Wind Gusts: 5.3m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 46420m. Meets requirement |
| Rule fails. 03:00 | Wind Speed: 2.7m/s. Misses requirement | Wind Gusts: 5.3m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 40680m. Meets requirement |
| Rule fails. 04:00 | Wind Speed: 2.7m/s. Misses requirement | Wind Gusts: 4.7m/s. Misses requirement | Precipitation Chance: 1%. Meets requirement | Visibility: 40700m. Meets requirement |
| Rule fails. 05:00 | Wind Speed: 2.4m/s. Misses requirement | Wind Gusts: 4.7m/s. Misses requirement | Precipitation Chance: 1%. Meets requirement | Visibility: 40700m. Meets requirement |
| Rule fails. 06:00 | Wind Speed: 2.7m/s. Misses requirement | Wind Gusts: 4.7m/s. Misses requirement | Precipitation Chance: 2%. Meets requirement | Visibility: 40720m. Meets requirement |
| Rule fails. 07:00 | Wind Speed: 2.8m/s. Misses requirement | Wind Gusts: 5.2m/s. Misses requirement | Precipitation Chance: 2%. Meets requirement | Visibility: 40720m. Meets requirement |
| Rule fails. 08:00 | Wind Speed: 2.9m/s. Misses requirement | Wind Gusts: 5.2m/s. Misses requirement | Precipitation Chance: 2%. Meets requirement | Visibility: 40720m. Meets requirement |
| Rule fails. 09:00 | Wind Speed: 3.4m/s. Misses requirement | Wind Gusts: 6.4m/s. Misses requirement | Precipitation Chance: 2%. Meets requirement | Visibility: 50760m. Meets requirement |
| Rule fails. 10:00 | Wind Speed: 3.6m/s. Misses requirement | Wind Gusts: 7m/s. Misses requirement | Precipitation Chance: 1%. Meets requirement | Visibility: 54800m. Meets requirement |
| Rule fails. 11:00 | Wind Speed: 3.8m/s. Misses requirement | Wind Gusts: 7.8m/s. Misses requirement | Precipitation Chance: 1%. Meets requirement | Visibility: 58060m. Meets requirement |
| Rule fails. 12:00 | Wind Speed: 4m/s. Misses requirement | Wind Gusts: 8.5m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 60900m. Meets requirement |
| Rule fails. 13:00 | Wind Speed: 3.8m/s. Misses requirement | Wind Gusts: 8.5m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 64820m. Meets requirement |
| Rule fails. 14:00 | Wind Speed: 3.6m/s. Misses requirement | Wind Gusts: 8.6m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 64840m. Meets requirement |
| Rule fails. 15:00 | Wind Speed: 3.9m/s. Misses requirement | Wind Gusts: 8.8m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 64840m. Meets requirement |
| Rule fails. 16:00 | Wind Speed: 3.8m/s. Misses requirement | Wind Gusts: 8.7m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 64840m. Meets requirement |
| Rule fails. 17:00 | Wind Speed: 4.1m/s. Misses requirement | Wind Gusts: 8.5m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 64840m. Meets requirement |
| Rule fails. 18:00 | Wind Speed: 3.1m/s. Misses requirement | Wind Gusts: 8.6m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 64860m. Meets requirement |
| Rule fails. 19:00 | Wind Speed: 2.5m/s. Misses requirement | Wind Gusts: 6.2m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 60940m. Meets requirement |
| Rule fails. 20:00 | Wind Speed: 2.5m/s. Misses requirement | Wind Gusts: 4.6m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 58120m. Meets requirement |
| Rule fails. 21:00 | Wind Speed: 2.8m/s. Misses requirement | Wind Gusts: 4.7m/s. Misses requirement | Precipitation Chance: 0%. Meets requirement | Visibility: 58140m. Meets requirement |
| Rule fails. 22:00 | Wind Speed: 3.1m/s. Misses requirement | Wind Gusts: 5.5m/s. Misses requirement | Precipitation Chance: 1%. Meets requirement | Visibility: 58140m. Meets requirement |
| Rule fails. 23:00 | Wind Speed: 3.1m/s. Misses requirement | Wind Gusts: 5.6m/s. Misses requirement | Precipitation Chance: 3%. Meets requirement | Visibility: 54900m. Meets requirement |
| Wed, Sep 23 | ||||
| Rule fails. 24:00 | Wind Speed: 3m/s. Misses requirement | Wind Gusts: 5.7m/s. Misses requirement | Precipitation Chance: 4%. Meets requirement | Visibility: 54920m. Meets requirement |
| Rule fails. 01:00 | Wind Speed: 3m/s. Misses requirement | Wind Gusts: 5.4m/s. Misses requirement | Precipitation Chance: 4%. Meets requirement | Visibility: 54920m. Meets requirement |
| Rule fails. 02:00 | Wind Speed: 3.2m/s. Misses requirement | Wind Gusts: 5.7m/s. Misses requirement | Precipitation Chance: 4%. Meets requirement | Visibility: 50900m. Meets requirement |
| Rule fails. 03:00 | Wind Speed: 3.4m/s. Misses requirement | Wind Gusts: 6.2m/s. Misses requirement | Precipitation Chance: 4%. Meets requirement | Visibility: 50900m. Meets requirement |
| Rule fails. 04:00 | Wind Speed: 3.5m/s. Misses requirement | Wind Gusts: 6.4m/s. Misses requirement | Precipitation Chance: 5%. Meets requirement | Visibility: 50920m. Meets requirement |
| Rule fails. 05:00 | Wind Speed: 3.7m/s. Misses requirement | Wind Gusts: 6.8m/s. Misses requirement | Precipitation Chance: 7%. Meets requirement | Visibility: 46620m. Meets requirement |
| Rule fails. 06:00 | Wind Speed: 3.9m/s. Misses requirement | Wind Gusts: 7.2m/s. Misses requirement | Precipitation Chance: 8%. Meets requirement | Visibility: 46640m. Meets requirement |
| Rule fails. 07:00 | Wind Speed: 4m/s. Misses requirement | Wind Gusts: 7.4m/s. Misses requirement | Precipitation Chance: 7%. Meets requirement | Visibility: 46640m. Meets requirement |
How to read: colored cells show whether each predicate requirement is met; highlighted rows mean the full rule matched (an opportunity).
Supporting forecast inputs
Additional hourly values for interpreting the forecast and any derived scores. See the separate requirements breakdown for rule logic; missing values are unavailable.
Supporting inputs are unavailable for the displayed forecast period.
How this forecast is evaluated
See which weather signals PhotoWeather uses to identify Mirror Lake conditions across Southern Finland. The requirements and hourly values above show how those signals apply at Porvoo.
Explore Mirror Lake 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
8
recorded matching windows · 66% average confidence
Last 90 days
30
recorded matching windows · 67% average confidence
Last 365 days
96
recorded matching windows · 67% average confidence
Most frequent recorded start hour
22:00 local time, shared by 10 of 96 matches recorded in the last 365 days.
Most represented month
February, with 26 of 96 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.
Create your own Mirror Lake alerts
Get notified when these conditions match at your own locations.
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.
Get Notified of Opportunities
Create your own custom alerts for this location and more.
Create Free Account