 Now, from your 24-hour weather station, here's Southern Iowa's most accurate forecast on Ottumwa Radio. I'm meteorologist Megan Mulford with a look at your forecast. A heat advisory begins at 1 p.m. this afternoon and continues until 8 p.m. tonight. 95 this afternoon, under mainly sunny skies, southwest winds 10 to 15 miles an hour. Mainly clear skies tonight, 75. Currently, it's 90 degrees.