No promises — measurements. Every day, yesterday’s forecast is compared with what the satellite actually observed. Here is the method, and the numbers — including the ones we miss.
Our forecasts, verified
No promises — measurements. Every day, yesterday’s forecast is compared with what the satellite actually observed. Here is the method, and the numbers — including the ones we miss.
The method
How a forecast is made
Copernicus / NOAA satellite, 4 passes a dayThe AFAI floating-algae index is sampled offshore of every beach, pixel by pixel — never a regional average.
A drift model, not a crystal ballBeaching persistence (5-day half-life), wind and offshore mats: the 7-day forecast is recomputed at every satellite pass.
An automatic backtest, every single dayEvery forecast is archived, then checked against the satellite observation on the target day. Fully automatic — nobody edits the numbers.
∅
When data is missing, we show nothingNo invented figures: if a measurement does not exist, the section disappears rather than guessing.
Freshness
The data you are looking at
Latest satellite measurementJuly 27 at 08:06 PM UTC · 20 monitored sampling points · data re-checked 4 times a day · this page is regenerated with every update.