The coldest air of the season so far will settle over the southern United States through the balance of the week and bring the first frost and hard freeze of the season.
Subfreezing temperatures settled in Thursday night and are expected again Friday night across the lower Ohio Valley southward into the Tennessee Valley.
Locations such as Springfield and Cape Girardeau, Mo., and Lexington, Ky., will dip into the upper 20s and officially bring the growing season to an end.
Some locations will experience their first freeze two to three weeks ahead of the normal date.
The cold air will sink farther south and expand farther east Friday night. There will be areas of frost as far south as southern Mississippi and southern Alabama, and as far east as the eastern Carolinas.
Temperatures Friday night will dip into the middle or upper 20s from the Tennessee Valley to central North Carolina and Virginia.
While the killing frost will mark an end to allergy season in some areas, those concerned about their tender vegetation should consider covering their plants or bringing them indoors to protect from damage.
In addition, there could be some impacts to the soybean crop in the lower Mississippi Valley.
"Locally, this freeze could damage a small percentage of the soybean crop that has not yet matured," said AccuWeather Agricultural Weather Expert Dale Mohler.
Ice scrapers will be in demand as windows on vehicles will become coated with frost Thursday night and Friday night.
People should allow some extra time in the morning before their commute to scrape off the frost or let their car warm up.
Temperatures in Huntsville, Ala., Knoxville, Tenn., and Asheville, N.C., will fall into the 20s, producing a hard freeze.
In the cities of Nashville, Tenn., and Raleigh, N.C., temperatures may not get below 30 degrees, but
outlying areas will dip into the 20s.
Temperatures in the South are expected to rise a bit over the weekend and into early next week.
Snow has begun to move into the Northeast, impacting the I-95 corridor.
Chicago will not catch a break from the bitter cold anytime soon, as more cold air heads to the city this week.
It has rained every day so far this month, except Dec. 1 around Atlanta. That trend will continue through Tuesday.
More waves of Arctic air are in the offing for Detroit this week.
After ending the weekend on a slick note, more cold air will dominate weather headlines this week.
Philadelphia International Airport received more snow (8.6 inches) from a single storm this past Sunday than it did all of last winter, when 8.3 inches fell.
Baltimore City (1878)
28.73" barometric pressure - Dec. record.
Madison, WI (1970)
16.0" snow, greatest 24 hour snowfall for city (10th-14th).
Bend, OR (1919)
28" snowfall set state 24 hour mark.