Update at 10:45 a.m. EDT Monday:
This blog is no longer live, as the severe threat has ended across the mid-Atlantic and South. Detailed reports of the event can be found below.
A storm system swept through parts of the mid-Atlantic and South Sunday through Monday, dumping a swath of snow and ice over much of the mid-Atlantic while pouring rain on the South. The storm caused major air and road traffic delays both days.
Travel conditions began to deteriorate Sunday from West Virginia to southern New Jersey as snow covered roadways led to dangerous roadway conditions. In the South, roadways became slippery leading to several multi-vehicle crashes along Interstate 40.
A mix of sleet and rain in portions of Virginia late Sunday night left more than 1,500 Dominion Electric power outages around the Richmond metro area.
By Monday morning, flight delays across the U.S. approached 1,000 with excessive delays out of Raleigh, Washington Reagan and Washington Dulles airports. Baltimore and Philadelphia International airports also experienced significant delays.
Along with flight delays, the Washington Dulles International Airport recorded a new snowfall record for March 16, with 6.6 inches of snow on Sunday.
Behind the storm, it will be very chilly, raw and damp from the Mason-Dixon Line through the Carolinas. Temperatures are forecast to run about 10 to 20 degrees below normal through Tuesday.
"There may be ice from another storm that will affect many of the same areas, and it may also be toward Washington, D.C.," DePodwin said.
9:25 a.m. EDT Monday: Flight delays across the U.S. have almost reached 1,000 this morning, according to FlightStats.
8:30 a.m. EDT Monday:
7:55 a.m. EDT Monday: For updates on the storm, watch this morning's edition of AccuWeather LIVE:
7:35 a.m. EDT Monday:
7:05 a.m. EDT Monday: Freezing rain reported by a 911 call center in Roxboro, N.C., left a glaze of ice on higher elevations.
6:35 a.m. EDT Monday: Excessive delays listed for Raleigh, Reagan, Dulles airports, significant delays in Baltimore and Philadelphia.
6:00 a.m. EDT Monday: Up to 7 inches of snow have been recorded by co-op observers in Braxton County, W.Va.
5:45 a.m. EDT Monday: The New Jersey Department of Transportation is listing weather-related speed restrictions on the Walt Whitman Bridge, Commodore Barry Bridge, Betsy Ross Bridge and Ben Franklin Bridge in all directions.
5:20 a.m. EDT Monday:
MARC-Train 870 (4:50am Brunswick departure) is operating 18-20 minutes late departing Point of Rocks Stat http://t.co/WQVLJ1Ujgp— MTA Maryland (@mtamaryland) March 17, 2014
4:31 a.m. EDT Monday: Metro has announced that Metrobus service in the Washington Metropolitan Area will have limited services today based on the current weather and road conditions.
3:09 a.m. EDT Monday: Roads are covered in snow around Washington, D.C., and Baltimore such as this road located just northwest of the capitol.
2:32 a.m. EDT Monday: The Washington Dulles International Airport recorded 6.6 inches of snow on Sunday, setting a new record for March 16. Snow continues to fall at the airport.
2:02 a.m. EDT Monday: Dominion Electric is reporting that more than 1,500 electric customers are without power in the Richmond Metro area where there has been a mix of rain and sleet for several hours.
1:15 a.m. EDT Monday: Three inches of snow has fallen at the Baltimore International Airport over the past hour.
1:04 a.m. EDT Monday: Light snow has begun to fall over Philadelphia.
11:52 p.m. EDT Sunday: Emergency manager reporting 6 inches of snow in Elizabeth, W.Va., with snow still falling across nearly all of the state.
10:50 p.m. Sunday: City officials reporting 6.5 inches of snow in Glenville, W.Va.
9:50 p.m. EDT Sunday: Difficult driving conditions reported in West Virginia, according to WVDOT.
Kanawha Co: Route 61 at Cabin Creek is closed due to a semi rollover from the Turnpike onto RT 61. pic.twitter.com/HJ327FvYUe— WVDOT (@WVDOT) March 16, 2014
9:40 p.m. EDT Sunday: About 400 flights have been canceled and another 4,300 flights delayed, according to FlightStats.
8:35 p.m. EDT Sunday: Three inches of snow has fallen 3 miles north-northeast of Mountain Home, Ark., an NWS spotter reported.
7:50 p.m. EDT Sunday: The heaviest snow band is stretching from northern Kentucky through West Virginia, according to AccuWeather.com Meteorologist Brian Edwards. Snow is coming down heavily in the Washington, D.C., area with falling temperatures and decreased visibilities.
"Now that we're past sunset, roads will become snow covered and very slippery," he said. "Wet roads may turn icy. Driving will become very hazardous."
6:55 p.m. EDT Sunday: Tune into the latest edition of AccuWeather LIVE for the most current storm information.
6:30 p.m. EDT Sunday: More than 300 flights have been canceled Sunday and another 3,300 delayed, FlightStats reports.
5:55 p.m. EDT Sunday: About 2.5 inches of snow 2 miles west of Warnock, Ky., an NWS spotter reported.
5:45 p.m. EDT Sunday: Rain and snow in Charlottesville, Va., according to Va. DOT webcam.
5:15 p.m. EDT Sunday: Four inches of snow fell 3 miles west of Lampe, Mo., emergency manager reported.
4:35 p.m. EDT Sunday: A band of heavy snow is expected to develop the next few hours from the mountains of West Virginia through Washington, D.C./Baltimore area with snowfall rates of 1 inch per hour expected after sunset, AccuWeather.com Meteorologist Brian Edwards said.
4:00 p.m. EDT Sunday: Snow has ended in De Soto, Mo., but not before 2 inches fell, according to NWS spotter.
3:55 p.m. EDT Sunday:Multiple-vehicle crash on I-24 near the Tennessee-Georgia state line, Tenn. DOT reports.
3:20 p.m. EDT Sunday: Tennessee DOT reports multiple-vehicle crashes on Interstate 40, Shelby County.
2:55 p.m. EDT Sunday: After about a two-hour delay, racing is set to begin in the NASCAR Sprint Cup Food City 500 at Bristol Motor Speedway, Bristol, Tenn.
2:40 p.m. EDT Sunday: Light snow reported south of St. Louis, according to Missouri DOT.
2:15 p.m. EDT Sunday: Snow beginning at Huntington, W.Va., according to West Virginia DOT webcam on Interstate 77.
A tropical wave is likely to become the Atlantic Basin's next tropical storm as it approaches or crosses the Caribbean Sea later this week and potentially pose eventual threats to North America.
Bouts of wet weather will frequent the northeastern United States during the last full week of September.
Typhoon Megi will continue to strengthen before threatening lives and property across Taiwan and eastern China this week.
Heavy rain and thunderstorms will continue to soak portions of Texas into Monday night, further heightening the risk of flooding.
Wintry weather marked the first days of autumn across parts of the Mountain West as snow mixed in with the changing fall foliage.
Gusty winds will accompany a push of chilly air across the Great Lakes from Sunday night through Tuesday.
Cape Hatteras, NC (1989)
Rained every day from the 12th to the 25th for a total of 15.51 inches. Normal for all of September is 5.78 inches.
Portland, ME (1991)
Record combined August-September rainfall of 19.65 inches up to Sept. 25. Old record was 14.65 inches in August-September 1954.
Clearfield, PA (1994)
Tornado touched down.