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VISIBILITY

Other Images


Safety and Preparedness


Legend and Definitions

The visibility threat level is based on the forecast or observation of fog (most likely) or smoke and its areal coverage and density.

The image depicts the visibility threat level.

Atmospheric conditions that are typical for fog development :

  • Moist ground or near ground conditions.
  • Light winds

green light=no threatNil  No Fog/smoke forecast or observed
yellow light=limited threatLimted Patchy fog/smoke with visibilities < 1/2 mile
red light=elevated threatElevated Areas of fog/smoke with visibilities < 1/2 mile
purple light=significant threatSignificant Areas of dense fog/smoke with visibilities < 1/4 mile
black light=critical threatCritical

Widespread very dense fog/smoke with visibilities < 1/10 mile


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