At this time a north to south oriented band of moderate to heavy snow was falling across the western Dakotas and rain was gradually changing over to snow across central South Dakota as cold air advected eastward. This cold air aloft further destabilized lapse rates across the region allowing the atmosphere to respond positively to the strong dynamic lift in place. By 1200 UTC the surface low had deepened further as it moved northeast into north central Minnesota with a very strong surface pressure gradient over South Dakota. Rain had changed over to snow in the east and sustained winds of 30 to 40 knot winds were common. As a result a band of light to moderate snow moved across eastern South Dakota during the day and strong winds accompanying the snow caused widespread blowing snow and poor visibilities for much of the afternoon.
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