Waves of cold air and moisture will bring the first snowflakes and snowfall of the season this week to the Great Lakes and central and northern Appalachians.
Meteorologist Dan DePodwin described the upcoming pattern as "a reminder that winter is on the way."
Mixed rain and snow and heavier snow showers can occur on multiple days this week.
States that are likely to catch their first glimpse of the white stuff this season include northeastern Illinois, northwestern Indiana, the western and northern Lower Peninsula of Michigan, northeastern Ohio, western and northern Pennsylvania, western Maryland, the West Virginia mountains, western and northern New York, the mountains of Vermont, northern New Hampshire and northwestern Maine.
AccuWeather.com meteorologists will also be monitoring the possibility for a potent storm system to shift that snow zone closer to the Ohio River and over more of the New England mountains.
Significant snow shower activity is not likely to reach the I-95 corridor. However, colder air will work its way to the coast in stages. After highs in the 60s Monday, temperatures will trend downward through the 50s later in the week.
Accumulating snow is most likely over the higher elevations of the Appalachians, parts of Michigan and northwestern Indiana, where a few inches are possible. Slow travel is possible over the highest elevations, especially along secondary roads with temperatures dipping into the 30s at times by day and the 20s at night.
It is possible that lawns and elevated surfaces in some valley and lower elevation spots get a light coating of snow.
Nearest to the shores of Great Lakes, warm waters make keep the air a bit too warm for all snow and perhaps any accumulation.
The snow for the lower Great Lakes and Appalachians follows the first snowflakes of the season for the Upper Midwest this weekend.
The first snow showers of the season will also fall over a large part of central and southern Ontario and western and southern Quebec this week.
Tropical Depression Eight could become a tropical storm while brushing the North Carolina coast with rough surf, downpours and locally gusty thunderstorms early this week.
Following several stretches of unseasonable heat in August, September is set to yield lower temperatures across the United Kingdom.
Tropical Depression Nine developed just south of Florida on Sunday and will turn toward the northeastern Gulf Coast of the United States later this week.
Another strong tropical disturbance will move off the coast of Africa early this week and bears watching for strengthening and impact on the Caribbean and the United States during September.
Typhoon Lionrock is poised to make landfall in Japan on Tuesday afternoon local time with heavy rainfall, damaging winds and an inundating storm surge.
Following a stormy weekend across Germany, a period of dry and more seasonable weather is in store this week.
Houston, TX (1980)
2.23 inches of rain fell in less than 1 hour. Streets were flooded in the downtown district and a tornado touched down briefly west of Houston at Sealy, TX.
Pittsburgh, PA (1982)
39 degrees, coldest ever in August.
Anchorage, AK (1989)
A total of 9.6 inches of rain -- wettest August on record.