... wait about 12 hours, in the case of Monday. The day began with ice from Sunday forcing closing of Iowa–Grant and Potosi schools and two-hour delays for Belmont and Platteville schools. Then the sun came out, the ice melted and the high reached 42, 15 degrees above normal. Then, in the evening, a thunderstorm came in, with severe thunderstorm warnings in northeastern Iowa. Snow forced closings of Platteville, Iowa–Grant, Belmont and Potosi schools today, and by Thursday the low is expected to drop to 12 degrees below zero.