A strong area of low pressure will move out of the central Rocky Mountains Saturday night and across the northern plains on Sunday. A widespread wintry mixture of precipitation is expected to evolve on Saturday night. Much of the initial precipitation is expected to be rain as it lifts out of eastern Nebraska and western Iowa, but as the precipitation encounters cooler air to the north, both surface and aloft, there will be a transition toward freezing rain and snow heading to the north and west. Farther northwest, the main precipitation type will be snow, with a period of freezing rain likely across southeast South Dakota, much of southwest Minnesota and extreme northwest Iowa from later Saturday night into Sunday morning, where upwards of a tenth to quarter inch of freezing rain is possible before precipitation changes over to snow. By Monday morning, snow accumulations from 5 to 10 inches are possible for areas mainly north of a Chamberlain to Marshall line, with 2 to 5 inches toward a Pickstown to Sioux Falls to Windom line.
It should be noted there is still some uncertainly in the track of this low pressure system. Even small deviations in the track of this system could mean large differences in snow and ice accumuluations, as well as precipitation type.