WWGM80 PGUM 191331 AWWGUM GUZ001-191600- Airport Weather Warning for Guam International Airport National Weather Service Tiyan GU 1131 PM ChST Tue Aug 19 2025 A Thunderstorm Advisory is in effect for the Guam International Airport from midnight until 200 am Wednesday morning. Thunderstorms are possible or occurring within 20 nautical miles of the airport. Be alert and take precautions as required. These storms have been producing occasional lightning. $$ Stanko