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NASA just released a temperature map of the continental US. It is glowing deep red. A massive heat dome has settled over the Plains. It works exactly like a giant, invisible lid. High pressure acts as a physical barrier, pushing warm air down and trapping it against the ground. It prevents cloud formation. It kills cooling winds. Add summer humidity, and the entire region turns into a steam cooker. Weather stations in places like Wyoming and Montana are logging temperatures not seen since records began over a century ago. This kind of heat is not just uncomfortable. It strains power grids and threatens lives. The data is clear. In 1980, the US averaged two summer heat waves a month. Today, that number is four. The extreme is slowly becoming the baseline.