Lincoln County’s “elevated risk” heat warning of Wednesday has elevated to a “significant risk” Thursday, according to the National Weather Service in Jackson.

Temperatures are now expected to be in the upper 90s through Friday, with peak heat index of up to 115 degrees.

The heat index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature

Heat stroke is increasingly likely to occur with prolonged outdoor activity under a significant heat stress risk. Residents are urged to stay hydrated and avoid spending long periods of time outdoors during this prolonged heat wave.

The area under the significant risk includes the majority of Lincoln County and all of Lawrence and Copiah counties, extending into the central portion of the state. A large portion of Mississippi, as well as portions of northeast Louisiana and southeast Arkansas are under elevated risks.

An extreme risk, where heat stroke is imminent with prolonged outdoor activity, exists across much of the Mississippi River Delta.

Weather Channel meteorologists recommend the following:

• Drink plenty of fluids.
• Stay in an air-conditioned room.
• Stay out of the sun.
• Check up on relatives and neighbors.
• Young children and pets should never be left unattended in vehicles under any circumstances.
• Take extra precautions if you work or spend time outside.
• When possible reschedule strenuous activities to early morning or evening.
• Know the signs and symptoms of heat exhaustion and heat stroke.
• Wear lightweight and loose fitting clothing when possible.
• To reduce risk during outdoor work, the Occupational Safety and Health Administration recommends scheduling frequent rest breaks in shaded or air conditioned environments.
• Anyone overcome by heat should be moved to a cool and shaded location.
• Heat stroke is an emergency! Call 9-1-1.