Ball Lightning at Oak Ridge National Laboratory (1960)

In 1960, scientists at Oak Ridge National Laboratory in Tennessee reported an observation of ball lightning that was particularly significant because it occurred within a major scientific research facility, where the credibility of witnesses and the availability of instrumentation were both high. During a thunderstorm, a luminous sphere was observed entering the laboratory through an open window, floating through the workspace at a height of approximately four feet, and disappearing after roughly ten seconds. The witnesses included trained physicists and engineers who were able to provide detailed estimates of the sphere's size (approximately 15 centimeters in diameter), color (blue-white), luminosity, and trajectory. The observation was documented in internal laboratory reports. The Oak Ridge sighting is one of several ball lightning observations at scientific and military facilities that have lent weight to the phenomenon's reality — when trained observers at institutions with no motivation to fabricate report seeing the same phenomenon described by thousands of lay witnesses, the case for ball lightning's existence becomes difficult to dismiss.