The storms on Monday pose several risks, including damaging winds, hail, and the possibility of isolated tornadoes. Heavy rainfall could lead to flash flooding, particularly in areas under a level 2 risk (out of 4) for flooding. Power outages and downed trees are also possible. Outdoor activities, including the World Cup match between France and Iraq at Philadelphia's Lincoln Financial Field, may face disruptions due to lightning and heavy rain. Residents are advised to prepare for potential travel delays and have backup plans for outdoor events.