This book aims to present the fundamentals of the meteorology and highlight those aspects of particular interest to all seafarers. It does not aim to provide a simple explanation, as this is regularly and professionally done by radio, television and the more elementary text books, nor does it delve into the highly complex explanations provided by research papers. The interaction of the seas and the atmosphere is considered, but no attempt has been made to treat this important subject fully, since there are many excellent works to which the seafarer should refer to improve their understanding. Meteorology for Seafarers is therefore a technical book which aims to explain the complexities of the atmosphere and provide the information needed by professional seafarers aspiring to first class certificates of competency and to students studying for degrees. If at the same time it encourages the seafaring reader to investigate and understand more clearly the forces of nature which affect his daily life, then it will have achieved the full ambitions of its authors. In this sixth edition, the opportunity has been taken to incorporate recent examples of marine forecasts and charts, and figures have been modified.