000 WWGM80 PGUM 191658 AWWGUM GUZ001-191830- AIRPORT WEATHER WARNING FOR GUAM INTERNATIONAL AIRPORT NATIONAL WEATHER SERVICE TIYAN GUAM 300 AM CHST THU JUN 20 2013 A THUNDERSTORM ADVISORY IS IN EFFECT FOR GUAM INTERNATIONAL AIRPORT UNTIL 430 AM. THUNDERSTORMS ARE POSSIBLE OR OCCURRING WITHIN 20 NAUTICAL MILES OF THE AIRPORT. BE AWARE AND TAKE PRECAUTIONS AS NECESSARY. $$ AYDLETT