Severe convective storms are among the most common, most damaging natural catastrophes in the United States. The result of warm, moist air rising from the earth, they manifest in various ways, depending on atmospheric conditions—from drenching thunderstorms with lightning, to tornadoes, hail, or destructive straight-line winds. Recent years have seen an increase in organized lines of thunderstorms with widespread damaging winds, known as derechos. As of late September 2023, U.S.