Historic March heatwave in US west shatters high-temperature records

A historic heatwave in late March shattered high-temperature records across the US Southwest. California, Nevada, and Arizona experienced temperatures 25-35°F above normal, prompting heat warnings and closures. Some of the hottest March temperatures ever recorded in the US were observed, and forecasts indicate continued high temperatures. The unseasonably warm weather affected multiple states, causing widespread alerts due to the unusual heat at the tail end of winter. The heatwave's impact is significant due to its intensity and timing.