...EXTREME HEAT WATCH NOW IN EFFECT FROM SUNDAY MORNING THROUGH WEDNESDAY EVENING... * WHAT...Dangerously hot conditions with heat index values up to 107 degrees possible. * WHERE...Mercer, Middlesex, Morris, Somerset, Sussex, Warren, and Hunterdon Counties. * WHEN...From Sunday morning through Wednesday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...The highest temperatures and heat indices will be Monday and Tuesday. Low temperatures near 75 to 80 degrees will not offer much relief at night. 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. &&