11:16 a.m. UPDATE
The National Weather Service has expanded an excessive heat warning to cover more of the state.
The warning, which had covered central Arkansas, is now in effect for that region as well as a large part of eastern and northeastern Arkansas.
Forecasters say the heat index will reach or exceed 110 degrees in the warned area.
The warning runs through 10 p.m.
Read Friday's Arkansas Democrat-Gazette for full details.
We have expanded the coverage of the excessive heat warning across central and eastern #ARwx for today #BeatTheHeat pic.twitter.com/dSl6cuYCLo
— NWS Little Rock (@NWSLittleRock) June 16, 2016
8:30 a.m. UPDATE
The National Weather Service has scheduled an excessive heat warning for much of central Arkansas, including Little Rock.
The warning will be in effect from 1 p.m. to 10 p.m. for 10 counties: Conway, Faulkner, White, Perry, Saline, Pulaski, Lonoke, Prairie, Grant and Jefferson.
The weather service said the area will likely see heat indexes above 110 degrees during the afternoon.
"The combination of hot temperatures and high humidity will combine to create a dangerous situation in which heat illnesses are likely," the weather service said.
EARLIER
For the second day in a row, the National Weather Service has placed all of Arkansas under a heat advisory, and forecasters warned that temperatures would would get even higher than earlier in the week.
Air temperatures throughout Arkansas will range from 94 to 97 degrees Thursday, according to weather service forecaster Jeff Hood. Temperatures on Wednesday were in the low-to-mid 90s.
Taking into account humidity, Arkansas will see temperatures over a wide area that feel as hot as 105 to 110 degrees, Hood said. Newport saw the highest temperatures Wednesday, Hood said, with a heat index of 114 degrees.
Hood said the state is near the center of a heatwave stretching from the Gulf Coast to the plains states of Iowa and Nebraska.
Arkansas and Oklahoma are both "in contention with being in some of the warmest readings," he said.
The weather service is urging people to be careful with outdoor activities to prevent heat-related injuries. In an effort to reduce hot-car deaths involving children, the service is using a new slogan this summer: "Look before you lock."