Winter Storm in Delphi to create hazardous travel conditions

Published on : Tuesday, December 1, 2015

map_specnewsdct-87_ltst_4namus_enus_485x273Winter Storm Delphi continues to dump snow, heavy at times, along with some sleet and freezing rain on the northern Plains and Upper Midwest. Snowfall rates of one to locally more than two inches per hour.


The snow will create potentially dangerous travel conditions in those regions, impacting metro areas such as Minneapolis/St. Paul, Sioux City, Iowa, and Sioux Falls, South Dakota. Locally up to a foot of snow is possible in some areas by the time the heaviest snow winds down later Tuesday.



The National Weather Service had posted winter storm warnings in parts of four states, including northeastern Nebraska, eastern South Dakota, southwest/south-central Minnesota and the northwestern half of Iowa. Winter weather advisories are in effect across a larger area from central Nebraska to northern Wisconsin and northeast Minnesota, where somewhat lower snowfall totals are anticipated.


Leftover snow is possible in the northern Great Lakes and Upper Midwest, from Michigan’s Upper Peninsula to northern/western Wisconsin, Minnesota, Iowa, northeast Nebraska and parts of the Dakotas.



This has the potential to disrupt both the morning and afternoon commutes in Minneapolis/St. Paul, and leftover snow and wind in the morning could also pose problems in Sioux Falls.



Snow lingering snow or a rain/snow mixture may pivot through the Great Lakes on Wednesday, however any accumulations will be minor.


Low pressure in the upper atmosphere had 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 in the Plains and West from Winter Storm Cara in recent days.



The upper-level  is now pivoting east into the Midwest. As it does so, moisture in the atmosphere will be lifted, and cold air in place will yield a swath of snow into Tuesday night from the High Plains to the Corn Belt, Upper Mississippi Valley and northern Great Lakes.

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