Travelers planning to fly in and out of Philadelphia International Airport can expect significant delays due to weather conditions. Thunderstorms and bad weather on August 7 have led to a two-hour closure at the airport. This announcement comes after the notification of a ground stop. Stream Philadelphia News for free, 24/7, wherever you are with NBC10. WATCH HERE WATCH HERETo monitor flight activity in the coming hours, track airport activity on the Federal Aviation Administration website.