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.
Smoke created hazy, orange views in Los Angeles on Saturday as the Sand Fire continued to rage less than 40 miles away from the city's downtown.
Darby will continue to deliver locally heavy rain, gusty winds and rough surf to Hawaii into early Monday. But the tropical storm will provide long-term benefits.
Gusty thunderstorms will target the northeastern United States on Monday, but will fail to sweep away the baking heat wave gripping the region.
Dangerous heat will surge northward and send temperatures soaring across the northwestern United States during the final week of July.
Downpours will spread from the lower Mississippi Valley to eastern and central Texas early this week, delivering needed rain but raising the concern for flash flooding.
With the heat of summer comes many unwelcomed pests, including mosquitoes, ants, fruit flies, wasps and stink bugs, into outdoor spaces and homes.
Tucson, AZ (1952)
60-mph winds ripped roofs off an apartment complex and an airplane hangar, sweeping dust and sand through the city and leaving 200 persons homeless.
North Carolina (1975)
Lightning killed 13 cows during a thunderstorm at Kenansville. Heavy rains elsewhere in the state forced the Tar River out of its banks at Greenville, causing 14 families to evacuate their homes.
New York (1975)
Severe thunderstorms in western and central NY: lightning struck a city park in Rochester injuring 12 children, all were playing on a metal jungle gym. One patrolman described the scene as if "someone threw a stick of dynamite in the middle of the crowd and it blew."