The National Weather Services has extended the Excessive Heat Warning to Saturday night at 7:00 p.m. for the listening area. Yesterday in Iowa the heat index got as high as 113 degrees with an even warmer day anticipated today. In Marshalltown the high was 90 degrees yesterday with a peak heat index of 108. Sioux City had the warmest temperature in Iowa Wednesday with a high of 97 degrees. A peak heat index for Thursday in Marshalltown is forecast to hit 112 degrees. Early Thursday morning, as of press time, the temperature was 80 degrees and the humidity was 96%.  The Senior Center in Marshalltown and the Salvation Army Citadel are official cooling stations in Marshalltown. Area residents may also seek refuge from the heat at the Marshalltown Mall, Plaza 9 Theaters which are showing matinees, and the Marshalltown Public Library.