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HEAT_INDEX
Max T
Min RH
Max Wind

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Safety and Preparedness

Heat Index

What to do before (Preparedness):

  • Bring plenty of water.
  • Wear light weight, light fitting, light colored clothes.

What to do during (Safety):

  • Slow down. Strenuous activities should be reduced, eliminated, or rescheduled to the coolest time of the day. Individuals at risk should stay in the coolest available place, not necessarily indoors.
  • Put less fuel on your inner fires. Foods (like proteins) that increase metabolic heat production also increase water loss.
  • Drink plenty of water or other non-alcohol fluids. Your body needs water to keep cool. Drink plenty of fluids even if you don’t feel thirsty. Persons who (1) have epilepsy or heart, kidney, or liver disease, (2) are on fluid restrictive diets or (3) have a problem with fluid retention should consult a physician before increasing their consumption of fluids.
  • Do not drink alcoholic beverages.
  • Do not take salt tablets unless specified by a physician.
  • Spend more time in air-conditioned places. Air conditioning in homes and other buildings markedly reduces danger from the heat. If you cannot afford an air conditioner, spending some time each day (during hot weather) in an air conditioned environment affords some protection.
  • Don’t get too much sun. Sunburn makes the job of heat dissipation that much more difficult

Threat levels and suggested actions:

Level
Affects
Precautionary Actions
green light=no theat

yellow light=limited threat Extended exposure could cause dehydration. Take breaks and drink plenty of water.
red light=elevated threat Sunstroke, heat cramps and heat exhustion possible with prolonged exporser and/or physical activity. Limit your time outside and drink plenty of water.
purple light=significant threat Sunstroke, heat cramps or heat ehaustion likely and heatstroke possible with prolonged exposure and/or physical activity in direct sun. Stay in the shade or indoors in air conditioning or a well ventilated room if possible.
black light=critical threat Sunstroke, heat cramps or heat ehaustion likely and heatstroke possible with prolonged exposure and/or physical activity. Stay in the shade or indoors in air conditioning or a well ventilated room.
Links
More Heat Index Information
Heat Index Chart

Legend and Definitions


The Heat Index shown is the maximum Heat Index for the 24 hour period.
Level
Heat Index
green light=no threatNil  < 100 deg F
yellow light=limited threatLimted > 100 deg F
red light=elevated threatElevated > 105 deg F or a heat advisory is in affect
purple light=significant threatSignificant > 110 deg F or a heat warning is in affect
black light=critical threatCritical > 115 deg F and a heat warning is in affect

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