Yet another winter storm is targeting parts of the Plains and Upper Midwest with potentially heavy snow early this week. This system could become our next named winter storm "Delphi" if it meets the winter storm warning population and/or area coverage requirments needed for naming.
Forecast location of the upper-level low pressure system on Tuesday in the Great Lakes. This system stalled in the Great Basin over much of the Thanksgiving holiday weekend.
Low pressure in the upper atmosphere has been stuck swirling over the Great Basin during the Thanksgiving holiday, trapped to the south of a corresponding area of high pressure aloft in an atmospheric logjam known to meteorologists as a "Rex block".
As a result, the weather had been rather stagnant and unchangeable, with periods of freezing rain, sleet and snow persisting in the Plains, and locally heavy rain soaking the warm side of Winter Storm Cara.
Now, that blocked-up jet stream pattern is finally giving way.
The upper-level low mentioned above will finally pivot east into the Midwest early in the week ahead. As it does so, moisture in the atmosphere will be lifted, and cold air in place will yield a swath of snow from late Sunday into Tuesday night from the High Plains to the Corn Belt, Upper Mississippi Valley and northern Great Lakes.
Winter storm watches have already been posted for portions of eastern Nebraska, southeast/south-central South Dakota, southern Minnesota and northwest Iowa, meaning the possibility exists for snowfall amounts greater than 6 inches within the next 48 hours. Those watches include the Minneapolis/St. Paul, Sioux City, Iowa, and Sioux Falls, South Dakota, metro areas. Winter weather advisories are in effect farther south, across southern Nebraska and northwestern Kansas, where somewhat lower snowfall totals are anticipated.
http://www.weather.com/storms/winter/news/winter-storm-midwest-plains-corn-belt-november-december-2015
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