The combination of a cold ground and the arrival of mild, moist air has begun to create a dangerous situation on roads in part of the East on Monday.
Pockets of rain and drizzle are creating a thin, invisible layer of ice from the Ohio Valley to the southern Appalachians and upper part of the mid-Atlantic.
This black ice, as it is called, is catching motorists off guard.
The icy mix will spread into Baltimore, Washington, D.C., Philadelphia and New York City later Monday afternoon, possibly making for a slick commute back from work and school.
7:30 a.m. EST Monday:
Numerous accidents have been reported throughout northern Alabama Monday morning due to icy conditions, according to local emergency management conditions.
6AM- JACKSON AND DEKALB COUNTIES- All roads are deemed impassable by local emergency management officials due to icy conditions and multiple wrecks. Non-emergency travel is strongly discouraged at this time.
— NWS Huntsville (@NWSHuntsville) January 8, 2018
6 a.m. EST Monday:
Rain is freezing on untreated surfaces as far south as northern Alabama.
We are receiving multiple reports of hazardous driving conditions throughout the county all roads have been deemed impassable effective immediately
— DeKalb County AL EMA (@DeKalb_Co_EMA) January 8, 2018
The swath of rain and drizzle will continue to expand eastward throughout the morning. Icy conditions could reach the Atlanta metro area during the mid-morning hours.
5 a.m. EST Monday:
Conditions on the Bluegrass Parkway near Elizabethtown, Kentucky, are rapidly deteriorating. Several accidents have been reported between mile markers 4 and 5.
Stretches of interstates 70, 75 and 675 are covered with snow and ice, according to the Ohio Department of Transportation. Over 1,000 crews are working to treat and plow roads in the state, the department said on Twitter.
Be alert: while treated roads may not be in bad shape, side streets, parking lots, and sidewalks are EXTREMELY slick in some areas. Exercise caution this morning! #INwx#Indy
— NWS Indianapolis (@NWSIndianapolis) January 8, 2018
3 a.m. EST Monday:
Law enforcement reports that roads in Orange County, Indiana, located in the southern part of the state, are quickly turning icy. Four vehicle accidents have occurred amid the icy conditions.