...EXTREME HEAT WATCH IN EFFECT FROM FRIDAY MORNING THROUGH SUNDAY EVENING... * WHAT...Dangerously hot conditions with widespread afternoon and early evening heat index values of 100 to 107 degrees, overall-worst on Friday and Saturday. * WHERE...Portions of central, east central, and south central Nebraska, including the Tri Cities. * WHEN...From late Friday morning through Sunday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Overnight temperatures will provide only limited relief from the heat, dropping no lower than the upper 70s. However, it will be fairly windy out of the south each day, with persistent gusts of 30 to 40 MPH possibly providing some relief for those outdoors. 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. &&