The National Weather Service has issued a heat advisory over several Maryland cities and counties, including the Perry Hall area, until Wednesday at 8 p.m.

Temperatures are expected to linger in the upper 80s and mid-90s until Friday. Heat index values could reach 105.

NWS officials suggest the following safety tips to avoid heat illnesses:

• Drink plenty of water
• Stay in an air-conditioned room
• Stay out of the sun
• Check in on relatives and neighbors
• 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 light weight and loose fitting clothing