If you want something a bit technical you can try this site with a big PDF document.
Very good, a bit old and for the Med is: Handbook of Mediterranean Weather
for Forcasters (US Navy). It is a PDF file to download.
A bit simpler and very good are:
Instant weather forecasting, by Alan Wats (Alard Coles) based on clouds.
The mariner weather handbook, Steve and Linda Dashew (Beowulf)
And if you read french you can try: Meteo and Strategie, J.Y.Bernot (Galimard).
For training you can use the Starpath Program on line or buy their CD package, very good too.