Organizers told crowds to seek shelter in nearby museums and federal buildings as severe weather moved toward Washington, disrupting Trump’s planned address while heat also strained celebrations across the East Coast

Extreme heatwave across US east coast already has already upended some of the weekend’s long-planned celebrations

People gathered for celebrations at the National Mall were encouraged to go into museums and other nearby buildings.

Severe weather forced an evacuation of Washington's National Mall on Saturday, disrupting President Trump's planned July Fourth address. Despite the downpour, Trump vowed to…