(State College) -- Temperatures in the mid 90s and high humidity are expected to hang over the midstate through the rest of the week.
Greg DeVoir is a senior forecaster with the National Weather Service in State College.
He says the combination of humid air and high temperatures can overwhelm people with respiratory problems, the elderly and children.
"It's much harder for your body to cool itself off when the dew points are in the 60s or lower 70s as they are," DeVoir explains. "Even in areas where there aren't advisories and warnings, people need to keep in mind heat safety, drinking plenty of water, minimizing activity during the hottest periods of the day."
DeVoir says people should stay in air conditioning where possible.
York County has opened its cooling centers to residents looking to escape the heat.
Forecasters expect a colder air mass to move south from Canada this weekend and break the heatwave.
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