The National Oceanic and Atmospheric Administration (NOAA) has issued a warning about a significant 'heat dome' expected to affect a large portion of the United States from April through June 2026. This weather phenomenon involves a high-pressure system that traps hot air, leading to above-normal temperatures across the western U.S., Plains, South, and Midwest. The southwest and Intermountain West regions are predicted to experience particularly intense heat, worsened by already low snowpack levels.