Which symbol represents Volcanic Eruption on a SIGWX chart?

• A. Active Volcano Symbol
• B. Severe Aircraft Icing
• C. Volcanic Eruption
• D. Tropopause HIGH

Answer: (C)

On SIGWX charts, symbols are used to flag specific weather hazards that can affect flight safety. The Volcanic Eruption symbol is the one that marks an eruption event and the presence of volcanic ash in the atmosphere. This is crucial for flight planning because volcanic ash can severely damage engines, abrade surfaces, and reduce visibility. So the symbol that specifically communicates volcanic eruption or ash hazards is the correct one to use. The other symbols, such as an icon for an active volcano, indicate different information (surface volcano location), severe aircraft icing points to icing conditions, and tropopause high indicates a high tropopause level—none of these denote volcanic eruption or ash hazards.