Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A storm warning generally refers to an advisory issued by an official meteorological department to warn citizens of approaching dangerous weather. A storm watch, on the other hand, typically refers to an advisory issued to indicate that conditions are favorable for the development of dangerous weather patterns, although the dangerous weather conditions themselves are not currently present. At sea, a storm warning is a warning for winds higher than 48 knots, although sometimes a hurricane force wind warning is used when winds exceed hurricane force of 63 knots and are not related to a tropical cyclone.