Extreme heatwave fuels July 4 storms as celebrations hit
An extreme heatwave gripping much of the United States is entering its final phase and could trigger severe thunderstorms during Independence Day celebrations. Cities from Washington DC to Philadelphia have canceled outdoor events as temperatures soar into record territory. A cold front is expected to move through, bringing storm risks to heavily populated areas. Despite heat advisories, fireworks and parades are still planned in many locations with modified schedules.