With additional winter storm warnings in Massachusetts, Connecticut and New York state, 67.9 million Americans in 19 states are under blizzard warnings or winter storm warnings as Winter Storm Jonas cranks up over the South and marches toward the East Coast, generating an expanding swath of snow and ice across both regions. Another 21 million people are under National Weather Service watches and advisories for winter weather in anticipation of Jonas' impacts.

Jonas has already dumped up to 16 inches of snow in eastern Kentucky as of Friday afternoon. A foot of snow has fallen in the mountains of western North Carolina and parts of southwest Virginia. A half foot or more of snow has also been measured elsewhere in parts of Kentucky, Tennessee, upstate South Carolina, northeast Georgia, western Virginia, West Virginia and Arkansas. Thundersnow was reported in the Nashville area Friday morning with snowfall rates of an inch per hour. Even heavier snowfall rates of 2 inches per hour have been observed in Jackson, Kentucky, and Roanoke, Virginia, Friday morning.

Snowfall has advanced as far north and east as the Baltimore area and central Delaware as Winter Storm Jonas continues its eastward march.

Stay with The Weather Channel and weather.com for continuing coverage of Winter Storm Jonas.