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Excessive Heat Warning Through Father’s Day, June 16

The National Weather Service has issued an excessive heat warning for Maricopa County and the Tucson area through Sunday, June 16.

What Are the Criteria for Excessive Heat Warning

The Phoenix area has plenty of days when the temperature reaches 107 degrees, however; an excessive heat warning is not issued.  Here are the criteria for an excessive heat warning:

  1. High temperatures and low temperatures, creating a larger variance
  2. Reaches the extreme threshold for temperature, over 95th percentile for hottest temperature.
  3. Weather models show high temperatures for a number of days. The National Weather Service in Phoenix has a special computer model that measures heat impact levels and the dangers they pose to Arizonans. The algorithm factors in both the forecasted high and low temperatures. The low is very important too!

How to Stay Cool in Excessive Heat

Here are some tips for staying cool when excessive heat warnings are issued:

  • Stay indoors in the air conditioning.
  • Postpone outdoor activities & games if possible.
  • Drink at least 1 – 2 liters of water every hour you are outdoors to stay hydrated.
  • If you are working hard outside, drink at least 4 liters per hour of hard labor.
  • Eat well-balanced, light meals on a regular schedule.

You should also:

  • Check on family, friends and neighbors who are of high risk in extreme heat, including the elderly, young children, people without AC, people who are sick, overweight or have an underlying health condition.
  • Do not leave alone pets or children in closed vehicles
  • Limit alcoholic beverages
  • Wear loose fitting, light-weight and light colored clothes. Dark colors do absorb the sun’s rays and get hotter.
  • Wear a high SPF sunscreen, as the UV index has reached a high threshold as well.