The worst of the ice headed to the eastern U.S. will focus on the I-81 corridor from Virginia to southern Pennsylvania.
An icy mix threatens to cause slick travel and some power outages over a large part of the Ohio Valley, mid-Atlantic and Northeast Sunday through Monday.
However, it is the I-81 corridor from Roanoke, Va., to Hagerstown, Md., to Harrisburg, Pa., where the most significant icing--amounts approaching or topping a half of an inch--will unfold.
Other cities in this zone include Blacksburg, Harrisonburg and Winchester, Va., and Martinsburg, W. Va.
The danger also encompasses the neighboring mountain valleys of western Virginia and eastern West Virginia, including the communities of Hot Springs, Va., and Beckley, W. Va.
Residents should prepare for widespread power outages and tree damage. Falling tree branches could cause additional damage and bodily harm depending on where they land.
Travel will become extremely treacherous not just on I-81 but also I-64, I-68, I-70 and I-77.
The worst icing will commence in Virginia's southernmost I-81 corridor Sunday morning, then will spread northward and reach Harrisburg, Pa., Sunday night.
After lasting roughly 6 to 12 hours, the ice will end as some rain or drizzle in a similar south-to-north fashion Sunday night through Monday morning.
Preceding the ice will be a period of snow and sleet, which will accumulate a general 1 to 3 inches and make roads and sidewalks slippery for those heading to church, shopping or other plans on Sunday.
The taste of September across the north-central United States will give way to a resurgence of heat, steamy air and severe weather by midweek.
Much cooler air with temperatures more typical of mid- to late September will sweep across the Great Lakes and Northeast early this week.
Residents of the northeastern and midwestern United States should not get used to the September-like air pouring in early this week.
The recent April-like rainy stretch of weather will quickly get erased by a resurgence of sizzling heat in northeastern China this week.
Despite escaping the worst of newly-formed Hurricane Dora, southern Mexico will still face locally flooding downpours and rough seas into Monday.
Much of the southern United States dealing with the aftermath of Cindy will get a break from hot, humid and stormy conditions by the end of the weekend.