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WINTER STORM WATCH IN EFFECT FROM THURSDAY AFTERNOON THROUGH FRIDAY AFTERNOON... * WHAT...Heavy snow possible. Total snow accumulations of 2 to 7 inches possible. Winds could gust as high as 35 mph. * WHERE...Portions of northwest Iowa, southwest Minnesota and south central and southeast South Dakota. * WHEN...From Thursday afternoon through Friday afternoon. * IMPACTS...Plan on slippery road conditions. Blowing snow could significantly reduce visibility. The hazardous conditions could impact the morning or evening commute. The cold wind chills as low as 25 below zero could cause frostbite on exposed skin in as little as 30 minutes.