...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 8 PM EDT THIS EVENING FOR THE LOWER SUSQUEHANNA VALLEY... ...HEAT ADVISORY IN EFFECT FROM 9 AM TO 7 PM EDT THURSDAY... * WHAT...For the Extreme Heat Warning for the Lower Susquehanna Valley for the rest of today, dangerously hot conditions with heat index values up to 105. For the Heat Advisory for Thursday, heat index values up to 101 expected. * WHERE...Adams, Cumberland, Franklin, and York Counties. * WHEN...For the Extreme Heat Warning, until 8 PM EDT this evening. For the Heat Advisory, from 9 AM to 7 PM EDT Thursday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. 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. &&