no_specific_area_geometry

at least one <area> block has neither a <polygon> nor a <circle> — specific geometry allows more precise delivery and reduces alert "spill" to people not at risk.

An <area> with neither <polygon> nor <circle> can only be targeted by whatever coarser geocode it carries (a county FIPS code, say), which delivers the alert to everyone in that county whether or not they're actually in the hazard's path. Specific geometry is how IPAWS avoids "spilling" a warning onto people who aren't at risk. Such "over-warning" is a major reason people ignore or "opt out" of your alerts.