A massive heat dome is sweeping across the US, breaking records in 14 states with temperatures reaching 44.4C. The dome is expanding and may become the largest ever.

<img alt="Topless man with snowpants skis through a puddle" height="349" src="https://i.cbc.ca/ais/4ee7d588-3ff5-49b6-8b4a-0241c9f87828,1774362253807/full/max/0/default.jpg?im=Crop%2Crect%3D%280%2C208%2C4000%2C2250%29%3BResize%3D%28620%29" title="Kole Riner, 16, skis through a puddle of water at Keystone Ski Resort as temperatures reach into the mid 60s in Keystone, Colorado, U.S., March 21, 2026. " width="620" /><p>A huge heat dome is spreading across the United States. After breaking March rec...