A huge heat dome is spreading across the United States and it is shattering March temperature records. On Monday, National Weather Service meteorologist Gregg Gallina said the heat covers an unusually large area. Weather historians say the dome has already smashed statewide March records in 14 states. By Wednesday parts of the Plains will reach the 90s. Experts say the heat wave’s footprint may rival major events in 2012 and 2021. World Weather Attribution says climate change makes this kind of heat about 800 times more likely. Forecasters say the pattern will last into next week.