Historic heatwave poised to hit dozens of US states this weekend

Dozens of states across the US are bracing for historically high spring temperatures this weekend, as a scorching heatwave moves east.

More than 120 million Americans are expected to be affected by the punishing heat, raising fears of health risks for the most vulnerable, outdoor workers and those who do not have access to indoor cooling. The National Weather Service issued a special statement cautioning residents to remain vigilant for signs of heat illness, take breaks inside when possible, and stay hydrated.

Records are expected to be broken in large swaths of the east, including in Washington DC, forecast to hit 96F on Saturday, and in Boston, which could get up to 93F.

Heat is a silent killer, often responsible for more deaths than higher-profile disasters like floods, hurricanes or tornadoes, and the rising toll is expected to worsen as the world warms.