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
 
 Heat and Cold Hazard
 
 Resources
 
 Legend (Click for Impacts)
None No extreme temperatures.
Slight Wind Chill 26-35 or Temp. near 32 in pockets; Heat Index 100 to 104 across wide area.
Moderate Wind Chill 16 to 25 or Temp. 26-32; Heat Index 105 to 109 across wide area.
High Wind Chill 1 to 15 or Temp 20 to 25; or Heat Index 110 to 114 across wide area.
Extreme Wind Chill ≤0 or Temp <20; or Heat Index ≥115 across wide area.
 
 

 
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