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SIGMETs, or Significant Meteorological Information messages, are designed to communicate information about potential hazardous weather that is not covered in standard area forecasts. They provide essential information for pilots and air traffic controllers related to significant weather phenomena that may impact flight safety.

These messages specifically address critical weather events such as severe turbulence, severe icing, thunderstorms, volcanic ash, and dust storms. The focus of SIGMETs is on large-scale weather systems that can pose a threat to flight operations, which is why they are not restricted to just severe weather events or general conditions. The intent is to alert flight personnel to potential dangers that go beyond typical weather forecasts, thereby ensuring that all relevant safety considerations are taken into account during flight planning and operations.

This specificity helps pilots adjust their routes and operational plans to avoid hazardous conditions, enhancing overall safety in aviation operations.