A coyote takes a break from the heat north of St. Mary's Rd., using the cool mud from the recycled water being pumped into the Santa Cruz River for the Heritage Project, Saturday, June 29, 2019, Tucson, Ariz.

The National Weather Service has issued an excessive heat warning for Tucson from 10 a.m. Monday to 8 p.m. Tuesday as isolated storms visit other areas in the region.

The service says an excessive heat warning is issued "within 12 hours of the onset of extremely dangerous heat conditions." Typically, the warning is in place when temperatures are expected to be 105 degrees or higher for at least two days and when nighttime air temperatures are not expected to be below 75 degrees.

The warning has also been issued for areas west of Tucson.

An increase in thunderstorm activity is expected Wednesday, but we'll first have to get through temperatures approaching 110 degrees.

High: 107

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Low: 82