With temperatures expected to climb above 110 degrees, an excessive heat warning is being issued for metro Phoenix for the second time in under a week.

The National Weather Service warning, which alerts residents to an increased risk of heat-related illness, was set for 10 a.m. Tuesday to 8 p.m. Thursday. Areas of concern extend from Tucson in southeastern Arizona to Colorado River communities in western Arizona.

“It’s definitely a pretty significant event,” Marvin Percha of the National Weather Service in Phoenix said.

The Phoenix forecast calls for a high of 108 degrees Tuesday followed by a pair of serious scorchers: 111 on Wednesday and 112 on Thursday.

That’s not quite record territory, but it’s more than 10 degrees above normal for this time of year. It could be even hotter in other areas of Maricopa County.

Warning signs of heat-related illnesses can include heavy sweating, muscle cramps, weakness, headache and nausea.

Too much time in the sun can lead to heat exhaustion, heat stroke and death.

“The best thing to do is make sure you restrict your outdoor activities, if at all possible, to … the late evening or early morning hours, and also to take breaks, remain well hydrated and also spend as much time as you can in air-conditioned cooler places,” Percha said.

You can also mitigate the heat by wearing a wide-brimmed hat to cover the face and neck. Long sleeves and loose-fitting clothing can help keep you cool and protect your skin from the sun. Make sure to also wear SPF on your face and body.

It’s so hot in Phoenix that a temperature record was broken Tuesday before most people even woke up.

The overnight low was 87 degrees, 5 degrees higher than the previous maximum low temperature and 13 degrees hotter than the normal low, authorities said.

The Salvation Army has activated its emergency disaster services to assist vulnerable residents.

The group’s 12 heat relief stations will offer indoor cooling and hydration from 11 a.m. to 5 p.m. Tuesday through Thursday:

• Apache Junction Corps Community Center, 605 E. Broadway Road.
• Avondale’s Estrella Mountain Corps Community Center, 11 N. Third Ave.
• Chandler Corps Community Center, 85 E. Saragosa St.
• Glendale Corps Community Center, 6010 W. Northern Ave.
• Glendale’s Valley of the Sun Korean Corps Community Center, 7238 N. 61st Ave.
• Mesa Corps Community Center, 241 E. Sixth St.
• Phoenix Citadel Corps Community Center, 628 N. Third Ave.
• Phoenix Maryvale Corps Community Center, 4318 W. Clarendon Ave.
• Phoenix’s Ray & Joan Kroc Corps Community Center South Mountain, 1375 E. Broadway Road.
• Phoenix’s Salvation Army Phoenix Family Services Office, 2707 E. Van Buren St., Building 2.
• Surprise’s Sun Cities West Valley Corps Community Center, 17420 N. Avenue of the Arts Blvd.
• Tempe Corps Community Center, 40 E. University Drive.

The Salvation Army will also deploy its mobile hydration unit to areas with high homeless populations.

After a slight cooldown to 107 on Friday, Phoenix could actually get some relief with double-digit temperatures this weekend.

An excessive heat warning was in effect Thursday-Sunday last week. On Friday, Phoenix reached a record-tying high of 112 degrees.

On top of the heat dangers, the Arizona Department of Environmental Quality issued an ozone high pollution advisory for Wednesday.

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