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Perceptions and Expected Immediate Reactions to Severe Storm Displays.

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Area of Science:

  • Meteorology and Atmospheric Science
  • Human-Computer Interaction
  • Risk Communication

Background:

  • National Weather Service uses warning polygons for specific risk areas.
  • Polygons lack numerical strike probability (ps) data.
  • Understanding public interpretation of polygons is crucial for effective warnings.

Purpose of the Study:

  • To investigate how the visual context of warning polygons affects public interpretation of strike probability (ps).
  • To assess the relationship between perceived ps and intended protective actions.
  • To compare interpretations of polygons presented alone versus with storm cell data.

Main Methods:

  • 167 participants evaluated 23 hypothetical tornado scenarios.
  • Three conditions: polygon-only, polygon + tornadic storm cell, polygon + storm cells.
  • Participants judged polygon ps and likelihood of nine response actions.

Main Results:

  • Polygon-only condition showed ps highest at the centroid, decreasing outwards.
  • Conditions with storm cells showed high ps at both centroid and nearest edge.
  • Perceived ps correlated positively with seeking information, shelter, and car evacuation.

Conclusions:

  • Presenting polygons with storm cells improves ps judgment compared to polygons alone.
  • Contextual information on radar displays aids more appropriate risk perception.
  • Ambivalence exists between appropriate sheltering and inappropriate car evacuation, mirroring real-world tornado responses.