An excessive heat warning has been issued for Pima County

An excessive heat warning has been issued for Pima County

The National Weather Service has issued an excessive heat warning for Pima County, which runs from 10 a.m. Saturday to 8 p.m. Sunday.

Dangerously hot conditions were forecast. Afternoon temperatures are expected to range between 105 and 113 degrees.

Affected areas include: western Pima County, Tohono O'odham Nation, metro Tucson, south-central Pinal County, and southeastern Pinal County.

Specific areas involved include: south-central Pinal County, including Eloy and Picacho Peak State Park; southeastern Pinal County, including Kearny, Mammoth, and Oracle; Tohono O'odham Nation, including Sells; Tucson area, including Tucson, Green Valley, Marana, Vail; Western Pima County, including Ajo and Organ Pipe Cactus National Monument.

For the latest watches and warnings, see our weather alerts page.

Climate data from the federal government shows the Southwest has become noticeably hotter over the past decade. The region experienced the most pronounced temperature rise in the country during that period, an increase that federal meteorologists said clearly reflects the impact of global warming.

In cities and surrounding areas, developed areas become noticeably hotter than the surrounding desert through an urban “heat island” effect, where asphalt, concrete and exposed surfaces absorb the sun’s heat and push temperatures higher.

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