249 WWGM80 PGUM 230400 AWWGUM GUZ001-230600- Airport Weather Warning for Guam International Airport National Weather Service Tiyan GU 200 PM ChST Sun Aug 23 2026 A Thunderstorm Advisory is in effect for the Guam International Airport until 400 pm this afternoon. Thunderstorms are possible within 20 nautical miles of the airport. Be alert and take precautions as required. These storms are capable of producing occasional lightning. $$ Mesa