Weather Alerts For Grantham, PA

# HEADLINE -------------------- EXTREME HEAT WATCH IN EFFECT FROM WEDNESDAY AFTERNOON THROUGH FRIDAY EVENING # DETAILS -------------------- WHAT Dangerously hot conditions with heat index values between 105 and 110. WHERE A portion of central Pennsylvania. WHEN From Wednesday afternoon through Friday evening. IMPACTS Heat related illnesses increase significantly during extreme heat and high humidity events. ADDITIONAL DETAILS Very warm low temperatures, mainly in the low to mid 70s at night will not offer much relief from the heat. This combined with multiple days of near record breaking temperatures will amplify the impacts from the heat and humidity. ISSUED AT Monday, June 29, 2026 at 2:22 AM EDT ISSUED BY National Weather Service State College PA HEADER URGENT - WEATHER MESSAGE # PRECAUTIONARY/PREPAREDNESS ACTIONS -------------------- Drink plenty of fluids, stay out of the sun, and stay in an air-conditioned room. Remember your pets and provide them with plenty of water and shade if left outdoors. # AREAS AFFECTED -------------------- Cumberland, Northumberland, Southern Clinton, Adams, Columbia, Dauphin, Franklin, Fulton, Huntingdon, Juniata, Lancaster, Lebanon, Mifflin, Montour, Perry, Schuylkill, Snyder, Southern Centre, Southern Lycoming, Union, York Including the cities of Selinsgrove, Lewisburg, Berwick, Lewistown, Carlisle, Lock Haven, Mount Union, Lancaster, McConnellsburg, Harrisburg, Williamsport, Lebanon, Sunbury, Huntingdon, Hershey, Mifflintown, Shamokin, Chambersburg, Gettysburg, Newport, State College, Bloomsburg, Pottsville, Danville, and York