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SIGMETs, or Significant Meteorological Information, provide pilots with essential warnings regarding significant weather phenomena that could affect flight safety. These advisories are issued concerning severe weather events such as thunderstorms, severe turbulence, icing, volcanic ash, and dust storms, making them critical for pilots to receive and understand.

While the other options relate to various aspects of aviation and flying, they do not encompass the primary function of SIGMETs. Detailed information about specific airports pertains more to NOTAMs (Notices to Airmen) and airport facilities rather than weather. Long-term weather patterns would typically be covered by forecasts and meteorological reports, which do not offer the immediate and dynamic warnings that SIGMETs do. Traffic alerts are relevant to runway operations and air traffic management but are unrelated to the weather conditions that SIGMETs address. Thus, the focus of SIGMETs on significant weather phenomena makes this the correct choice.