Probabilistic Heavy Snow and Icing Discussion
NWS Weather Prediction Center College Park MD
411 AM EDT Sat May 09 2020

Valid 12Z Sat May 09 2020 - 12Z Tue May 12 2020


...Northern New England...
Day 1...
A late-season winter storm is expected to bring heavy snow to
portions of northern Maine on Saturday.

Low pressure tracking across southeastern Massachusetts will
continue to deepen as it moves through the Gulf of Maine later
this morning.  Cold air in place north of the system will support
snow across northern New Hampshire and Maine, with heavy amounts
likely across portions of northern Maine.  WPC PWPF indicates snow
accumulations of 8-inches or more are likely across parts of
eastern Aroostook County in Maine.  Snows will likely diminish as
the system tracks into the Canadian Maritimes this afternoon.

...Northern Plains/Upper Midwest...
Day 1...
Low pressure associated with an amplifying shortwave will continue
to track southeast across North Dakota into southern Minnesota on
Saturday.  Sufficient cold air, along with low-to-mid level
frontogenesis and strong upper forcing will support snow north of
the low.  WPC PWPF indicates accumulations of 2-inches or more are
likely, with some potential for amounts of greater than 4-inches,
across northeastern North Dakota Saturday morning into the
afternoon.  As the system continues to drop to the southeast,
light accumulations could extend through central Minnesota into
northern Wisconsin late Saturday into early Sunday.

The probability of significant icing is less than 10 percent.

Pereira