Iowans will feel relief from the heat at last, if they can endure one moreday in the oven. Forecasters say a cold front should flow over the HawkeyeState tonight and bring significantly cooler weather for the weekend andinto next week.Craig Cogil (coe’-gul) is a meteorologist at the National Weather Servicebureau in metro Des Moines. He says the expected highs in the 70s next weekwill be 20 or 30 degrees below the forecast highs for today. This isexpected to be the 18th day during July where it’s been at least 90 degrees.Cogil says today will be another steamy one as some Iowa cities may againreach the 100-degree mark. While we’ve seen heat advisories across the statemany times in the last several weeks, today eastern and central Iowa areunder a more extreme threat.Keokuk recorded a high of 106 yesterday. The highest reported heat indexcame from Sheldon with 143 at 4 o’clock yesterday afternoon.