Weather Forecasts

Accuweather, used it for years, no better or worse than any of the others.

I use the BBC and XC-Weather. They seem to use different datasets so if they agree, more or less, my confidence is a little higher. When I'm in Anglesey, sailing in Holyhead bay I compare the actual measurements from here http://www.holyheadport.com/navigation.php with the forecast from the last few hours and if they appear to have got it right I'll be even more confident that the trend forecast will continue.

XC weather because we have two live feeds locally, one at Lydd which is to the South West and one at Langstone bay in the East so between them we have the next few hours at least pretty accurate. The rest of the time I use a Meteogroup app and I love that Rain Today spin off app for barbies and such, you can almost set your watch to it. It even works out here on the island from Essex hell (Ibitha)

I use XC and Windguru but as others have said, they are all a bit of a guess until 24 hours before hand. Many years back I was part of a team that was using Chaos theory to help make weather forecasting more accurate, most of us ended up working in banks and that lead to the last financial crash with the same theory being used in plenty of the quant models that traders relied upon. The models have improved alot over the last 20 years so the weather forecast is much better but the volume of data you have to process and the possible variations that science does not yet even understand still means that a forecast more than 24 hours out is no more than an educated guess when it comes to wind strength.