The Weather Handbook is the essential guide to how the weather is formed, providing readers with the ability to look at the sky and interpret its signs, and combine this knowledge with information provided by professional forecasts to assess for themselves what the coming weather is likely to be. This handbook has been the standard reference for over 20 years for students on Day Skipper and Yachtmaster courses, and the handbook of choice for skippers and crew of cruising and racing yachts. The fourth edition has been updated and expanded with new photos and explanatory text, addressing new sources of weather information. There are countless websites and apps providing forecast data, and The Weather Handbook guides users in how to use and interpret this information for themselves, taking a general forecast for a wide area to provide a local forecast for a specific location.