It’s the first of two storm systems that will affect large parts of the country through Tuesday.
If that happens, an abrupt change in wind speed and direction with height, known as “wind shear,” will foster rotation within the storms. Any cells that form will have the propensity to produce damaging winds to 60 mph, quarter-size hail and a few brief tornadoes. Storms will rapidly move to northeast Iowa, probably affecting areas such as Fort Dodge, Jefferson and Des Moines, before weakening with the setting sun as they progress east.
An isolated supercell can’t be ruled out in northern Missouri as well, especially in the vicinity of Interstate 35.The deepening, or strengthening, low-pressure system will swirl south a shot of frigid Arctic air in its wake, the cold coming in multiple waves. The first will yield a 30-degree temperature drop along the cold front Saturday evening before a reinforcing cold air mass slides southeast on Sunday.
Moderate to heavy snow will push east out of northeast Colorado and eastern Wyoming into the Sand Hills of Nebraska and the Black Hills of South Dakota on Saturday morning. Wraparound moisture on the back side of the low falling into cold air will generate additional moderate snows in the James River Valley of South Dakota and adjacent Minnesota during the evening.
A broad 3 to 5 inches is likely in western Nebraska and southwest South Dakota, with a narrow strip of 1 to 4 inch totals in eastern South Dakota and in a zone of Minnesota. Winter weather advisories blanket much of that area. The bulk of the snow may remain just north of Minneapolis.By Sunday morning, lows will fall into the teens in Wyoming, Kansas, the Dakotas and most of Minnesota, with lower 20s in Iowa.
In the front’s wake, near normal temperatures will cover most of the Lower 48 Tuesday into early Wednesday before a second and far more frigid Arctic blast crosses the northern U.S. border and eventually dives southeast toward the East Coast by the weekend.
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