(Marshalltown, IA) – It’s round 2 in the Weather Department. First the storms and then the sweltering heat wave. With temps expected to soar into the 90’s beginning tomorrow and heat indexes well into the triple digits…The National Weather Service has issued an Excessive Heat Watch beginning tomorrow through Friday night. Keep in mind, the Marshalltown Senior Center, the Public Library and the Salvation Army are all serving as Cooling Centers during this latest heat wave.