Watching a program ‘The Code’ about mathematics and how they influence everything tonight, and weather forecasting was covered, showing how a set of available data was modelled to show the affects of changes over time, then extrapolated over days. After five days it’s already becoming chaotic, after ten it’s effectively meaningless, the plotted data on a screen is just a scrambled mess. As above, the various met bodies use models that take data from lots of different sources; I believe the Met Office model tends to ignore ocean current and surface temps, which some meteorological experts reckon skew their results somewhat, which is why their predictions over the last several years have been out. I always use WeatherPro on my phone, which is run by Meteogroup, who are German based. I’ve generally found their forecasts to be pretty accurate, almost to the hour on some occasions.