The National Weather Service says the advisory will remain in effect until 8 p.m. Wednesday, July 15, 2026, across portions of central Pennsylvania.
The combination of heat and high humidity could increase the risk of heat-related illnesses. Residents are encouraged to drink plenty of fluids, avoid prolonged exposure to the sun and spend time in an air-conditioned location whenever possible.
Children, older adults, outdoor workers and people with existing health conditions are especially vulnerable during periods of extreme heat. Pets should also be provided with shade and fresh water and should never be left inside a parked vehicle.
Forecasters noted that smoke moving overhead from wildfires in Ontario and northern Minnesota could lower Wednesday’s temperatures by a degree or two. If that occurs, it could slightly reduce the risk of heat-related illnesses.
In addition to Schuylkill County, the advisory includes Centre, Clinton, Columbia, Dauphin, Huntingdon, Juniata, Lebanon, Lycoming, Mifflin, Montour, Northumberland, Perry, Snyder and Union counties.