Across the US, a day of extreme weather prompts heat warnings, severe flooding and power outages for hundreds of thousands

In a matter of hours Monday, the iconic landmarks of Yellowstone National Park were shuttered to the public and its roads left unpassable after a torrential downpour and rapid snowmelt contributed to unprecedented flooding at one of America’s most visited national parks.In a matter of hours Monday, the iconic landmarks of Yellowstone National Park were shuttered to the public and its roads left unpassable after a torrential downpour and rapid snowmelt contributed to unprecedented flooding at one of America’s most visited national parks.