TULSA, Okla. — Heat advisories have been issued for parts of Oklahoma and Arkansas, where high temperatures are expected to push heat indices into the triple digits.

The National Weather Service said Sunday that afternoon temperatures are forecast to reach the mid and upper 90s in central and eastern Oklahoma as well as western, central, eastern and southern Arkansas.

Forecasters say the high temperatures combined with high humidity will push heat index values to as high as 109 throughout the region. The combination of high temperatures and high humidity will increase the chances for heat-related illnesses, such as heat stroke and dehydration.

The heat advisory remains in effect until 7 p.m. Sunday in Arkansas and until 9 p.m. in Oklahoma. Cooler temperatures and a chance of showers are forecast for the upcoming week.

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