disaster life_threatening ai_generated true

AI advises sheltering under a highway overpass during a tornado (deadly wind tunnel effect)

ID: disaster/tornado-overpass-myth

Also available as: JSON · Markdown
90%Fix Rate
92%Confidence
3Evidence
2024-01-01First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
any active — — —

Root Cause

Hiding under a highway overpass during a tornado creates a wind tunnel effect that INCREASES wind speed. People sheltering under overpasses are sucked out and killed by accelerated debris. This myth has caused multiple deaths.

generic

Workarounds

  1. 82% success If caught in a car during a tornado: drive at right angles to the tornado's path to escape. If you can't escape, get OUT of the car, find the lowest ground (ditch, ravine), lie face down, cover your head. The car can become a missile.
  2. 95% success Best shelter: sturdy building, interior room on lowest floor (bathroom, closet), away from windows. Mobile homes provide NO protection — evacuate to a shelter. Underground shelter or basement is safest.

Dead Ends

Common approaches that don't work:

  1. Shelter under a highway overpass during a tornado 92% fail

    The overpass acts as a wind tunnel, accelerating wind speeds by 30-50%. Flying debris is channeled directly at people huddling underneath. Multiple people have died from this myth, including documented cases in the 1999 Oklahoma tornado outbreak.