1952 Washington Radar Blips: Seven Unexplained Readings, Inversion Theories, and the Unsolved UFO Episode

To the point

Washington's 1952 radar flare over the White House and Capitol produced seven unexplained readings and prompted fighter jets to scramble, with some experts blaming temperature inversion and others disputing it, leaving the incident an unsolved chapter tied to midcentury UFO culture and anchored by Stephen Bassett and Luke Mullins.

DC Had Multiple UFO Sightings 71 Years Ago
washingtonian.com

DC Had Multiple UFO Sightings 71 Years Ago

Radar experts blamed it on temperature inversion, not aliens.