Extreme Heat Warning

Locations Affected

Lancaster, PA ∙ Conestoga, PA ∙ Ephrata, PA ∙ Millersburg, PA ∙ Rouzerville, PA ∙ Shrewsbury, PA ∙ Schlusser, PA ∙ Harrisburg, PA ∙ Hummelstown, PA ∙ Annville, PA

Full Alert Message

URGENT - WEATHER MESSAGE National Weather Service State College PA 759 PM EDT Tue Jun 24 2025 ...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT WEDNESDAY FOR THE LOWER SUSQUEHANNA VALLEY... * WHAT...Dangerously hot conditions with heat index values over 105 degrees for the Lower Susquehanna Valley. * WHERE...Adams, Cumberland, Dauphin, Franklin, Lancaster, Lebanon, Perry, and York Counties. * WHEN...Until 8 PM EDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...The highest heat index will occur in the urban valley locations. Temperatures in the 70s overnight will provide little if any relief. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay out of the sun, and stay in an air-conditioned room. Check up on relatives and neighbors, and provide pets with adequate water and shelter from the sun. Extreme Heat can be life-threatening among at-risk populations, such as children, the elderly, and those with pre-existing health conditions. In addition to the daytime heat, overnight low temperatures will also be very warm and oppressively muggy.

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