you need to catch up with the times.

Do a Google on Ugrib and download over Inmarsat, broadband, SailMail or 3G cellphone, detailed 7 day forecasts @ 3-hr intervals.
The information is that which is used by all the met-services throughout the world and merely needs a little native cunning to produce a very much better forecast than any poor metman, sitting in an office 1000s of miles away, trying to fit a vast amorphous mass of data into a straightjacket of phrases easily understood by morons using their 2nd language.

The problem with ALL meteo forecasts is that they have to deal with large areas, containing highly variable chaotic systems as dead-standard points.

Navtex for weather is, with sight Reduction Tables, chronometers, sextants and starsights, a thing of historic interest for the connoisseur.