First Excessive Heat Warning issued for Maricopa, Pinal counties

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By Jennifer Thomas By Jennifer Thomas

PHOENIX -- Temperatures across the Valley are expected to reach dangerous levels Sunday. The National Weather Service issued the first Excessive Heat Warning of the year for Maricopa and Pinal counties. Daytime highs are expected to reach 108 to 111 degrees for most Valley communities.

According to U.S. forecasters, heat is the No. 1 weather-related killer. Take extra precautions if you work or spend time outside. Schedule strenuous activities during the early morning or late evening hours. Know the signs and symptoms of dehydration, heat exhaustion and heat stroke. Wear lightweight and loose-fitting clothes when possible and drink plenty of water. If you wear a wide-brimmed hat, your head and body will be much cooler.

As high-pressure sets up shop in northern Mexico, heat will infiltrate the desert Southwest. We’re forecasting a high of 109 at Sky Harbor International Airport by Sunday afternoon. Average for this time of year is 100. The current record for this date is 110, set in 2006.

By Monday, afternoon highs will drop several degrees thanks to a weak trough that moves through the area through the week. We’ll see daytime temperatures range from 103 to 107. Early morning low temperatures will dip into the upper 70s across the Valley.