York County is under a heat advisory until 8 p.m. Monday, June 18, according to the National Weather Service.

A high of around 90 is expected Sunday and Monday, but when combined with humidity it will feel more like 103 degrees, the weather service states.

The heat and humidity could cause heat stress during outdoor activity or during extended exposure, according to the advisory.

“Limit or reschedule strenuous outdoor activities,” the weather service warns. “Find shade and stay hydrated. Check up on the elderly, sick and those without air conditioning. Never leave kids or pets unattended ... look before you lock.”

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