With Butler County under an extreme heat warning until 10 p.m. Friday, July 3, residents are being advised to keep cool and keep an eye out for heat-related illness.

National Weather Service of Pittsburgh meteorologist Matt Brudy said Thursday and Friday will continue Wednesday’s trend of mid-to-upper 90s with heat index values surpassing 100 degrees.

“With dewpoints sticking in the low-to-mid 70s, it will keep that sticky feeling around and keep the heat index in the 100- to 110-degree range,” he said.

He added that there will be little to no relief in the overnights, as temperatures are expected to bottom out in the mid-70s.

This weekend, Brudy said the high-pressure “heat dome” system will begin to dissipate and create opportunities for showers and thunderstorms late Friday and into the weekend.

“We still don’t have any confidence in when or where we might see it,” he said.

Even with possible rain, temperatures will still reach a high in the low 90s on Saturday and Sunday.

Brudy advised county residents to take heat precautions through the rest of the week and into the weekend as well as keeping up to date on weather conditions.

With the extreme heat, Independence Health System offered some tips for staying cool and aware of heat-related illness during the heatwave.

Michael Fiorina, chief medical officer of Independence Health System, said extreme heat can cause heat-related illness that can quickly become serious if not addressed.

“The best prevention is to stay hydrated, limit outdoor activity during the hottest parts of the day, wear lightweight clothing and take frequent breaks in air-conditioned spaces,” he said.

He advised that older adults, children and those with chronic health conditions are especially vulnerable to heat and should be checked regularly.

“If someone develops symptoms such as confusion, dizziness, a rapid pulse, hot or dry skin or loses consciousness, seek emergency medical care immediately. Recognizing the warning signs early can help prevent a medical emergency,” Fiorina said.

A few organizations, such as the Grapevine Center and Butler County Area Agency on Aging, announced that they will open their doors as a way to help people stay cool.