...HEAT ADVISORY IN EFFECT FROM NOON TO 8 PM CDT FRIDAY... ...EXTREME HEAT WATCH REMAINS IN EFFECT FROM SATURDAY AFTERNOON THROUGH SUNDAY EVENING... * WHAT...For the Heat Advisory, heat index values of 100 to 105 are expected. For the Extreme Heat Watch, dangerously hot conditions with heat index values around 105 or higher possible. * WHERE...Portions of north central, central, and south central Iowa. * WHEN...For the Heat Advisory, from noon to 8 PM CDT Friday. For the Extreme Heat Watch, from noon Saturday through Sunday evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Heat impacts will be worsened by several consecutive days of sweltering temperatures, with little relief overnight as lows will only be in the upper 70s. 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. &&