 The National Weather Service in Des Moines has issued a severe thunderstorm warning for southeastern Black Hawk County in northeastern Iowa, northeastern Tama County in central Iowa, until 4.45 p.m. At 4.15 p.m., a severe thunderstorm was located 5 miles west of La Porte City, or 13 miles south of Waterloo, moving east at 30 mph. Expected hazards include 60 mph wind gusts and quarter-size hail.