Phoenix weather: Heat warning for Valley

Posted: Updated:
By Catherine Holland By Catherine Holland
By Catherine Holland By Catherine Holland
By Catherine Holland By Catherine Holland
By Catherine Holland By Catherine Holland

PHOENIX -- The National Weather Service in Phoenix has issued an Excessive Heat Warning for Friday's hot temperatures. 

The warning is in effect 10 a.m.-8 p.m. Friday, but begins today at noon for portions of Northwest Arizona, including Kingman. 

The NWS puts out an Excessive Heat Warning in two instances based on the heat index, which is how hot it feels when the relative humidity is added to the actual air temperature.

      1. The heat index hits at least 105 degrees for more than three hours on two consecutive days.

      2. The heat index hits 115 degrees for any length of time.

We're forecasting a high of 111 degrees Friday, and only a few degrees shy of that today, when the mercury is expected to rise to 109 degrees. 

During these hot temperatures, you should stay indoors in an air-conditioned place. If you must go outside, wear light-fitting clothing, take frequent breaks and stay hydrated. The best time to get your outdoor activity in would be during the early morning or late evening. Elderly, young children and those with health issues are most susceptible to the heat, so they need extra attention during this period.

Read: Risk of dehydration rises with coming heat wave

Read: What you need to know about heatstroke

Clear skies are expected all the way through the weekend when afternoon highs will continue to rise above average, peaking near 108 both Saturday and Sunday. 

Overnight lows will bottom out in the low 80s.   

Not much relief from the heat is expected next week, and no rain is expected for at least the next seven days. 

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