...EXTREME HEAT WARNING REMAINS IN EFFECT UNTIL 9 PM EDT THIS EVENING... ...EXTREME HEAT WARNING REMAINS IN EFFECT FROM 11 AM TO 9 PM EDT TUESDAY... * WHAT...For the first Extreme Heat Warning, dangerously hot conditions with heat index values up to 110 expected. For the second Extreme Heat Warning, dangerously hot conditions with heat index values up to 110 expected. * WHERE...Portions of DC, central, north central, northeast, northern, and southern Maryland, and central and northern Virginia. * WHEN...For the first Extreme Heat Warning, until 9 PM EDT this evening. For the second Extreme Heat Warning, from 11 AM to 9 PM EDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. PRECAUTIONARY/PREPAREDNESS ACTIONS... Drink plenty of fluids, stay in an air-conditioned room, stay out of the sun, and check up on relatives and neighbors. Do not leave young children and pets in unattended vehicles. Car interiors will reach lethal temperatures in a matter of minutes. &&