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5 days is the longest reliable forecast you can get.GRIB uses a system called GFS (global forecasting system), and no, sorry, most forecaster definitely don't use it. Forecasters are the people who interpret GFS, etc, and produce weather forecasts from it.A simple to use GFS chart.http://www.ukweatherworld.co.uk/plotter/gfs-v2.aspChose area then country then the date.Then either chose from the bottom left'precipitation rate (mm per hour)'or'10m wind' which is in knots and not mph.Then click on 'make plot'It may take a bit of time to get used to but it's worth it.For trends over the coming months some go by the + or - state of the North Atlantic Oscillation ( http://en.wikipedia.org/wiki/North_Atlantic_oscillation ) and others go by El Nino ( http://en.wikipedia.org/wiki/El_Ni%C3%B1o%E2%80%93Southern_Oscillation ).
I should clarify - by forecasters I mean Maritime Application - I have a sea faring friend and this was his suggestion.
Quote from: EandM on November 22, 2012, 11:47:01 pmI should clarify - by forecasters I mean Maritime Application - I have a sea faring friend and this was his suggestion.No worries. The weather has been my main interest for about 40 years since I was a kid.