National Weather Service United States Department of Commerce
  Weather Impact Levels  

Lightning Tornado Prevailing Wind TS wind and/or Hail Inland
Flood
Coastal
Flood
Surf & Rip Current Waves Visibility Heat/Cold
Lightning Tornado Wind TS Wind and or Hail Inland Flooding Coastal Flooding Surf & Rip Current Seas/Waves Visibility Heat/Cold
Lightning Tornado Wind Hail Inland Flooding Coastal Flooding Surf & Rip Current Seas/Waves Visibility Heat/Cold
 
 Visibility Hazard
 
 Resources
 
 Legend
None No visibilities below 1/4 mile.
Slight Patchy (1-20% coverage) visibilities < 1/4 mile in fog
or < 1 mile in heavy rain
Moderate Areas (30-50% coverage) of visibility < 1/4 mile.
High Widespread (60-80% coverage) visibilities < 1/4 mile.
Extreme Total (>80% coverage) visibilities < 1/4 mile.
 

 
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