PHOENIX (AP) -- The city of Yuma heated up to a record-setting temperature Wednesday, while Phoenix came close to breaking its own.
The National Weather Service says Yuma hit a high of 117 Wednesday, surpassing the record of 115 set on July 23 in 1959.
Phoenix tied the day's record of 114, which was set in 2006.
The city and parts of southwestern Arizona were under an excessive heat warning much of Wednesday due to temperatures that will range from 112 to 118 in low desert locations.
The warning issued by the National Weather Service runs from 10 a.m. to 8 p.m. Thursday.
Forecasters, however, say thunderstorms may mitigate the very hot temperatures.
Meanwhile, a high pollution advisory for ozone is in effect Wednesday for the Phoenix area due to high temperatures and a shift in air flow.
Air-quality officials are urging residents to drive less, refuel after dark and avoid waiting in long drive-thru lines. Also, children and adults with respiratory problems were advised to avoid outdoor activities.