Here we go again: Snow and ice are walloping the Northeast, which hasn’t even finished digging out from the blizzard last week.
Here's a running guide to travel and transportation hassles across the country due to the storm — filled with everything you need to know about road closings, rail delays and flight cancellations. Check back for updates.
5:05 a.m. ET: At least 760 flights have been canceled Tuesday, according to Flightaware, with New York's La Guardia, Boston, Chicago and Newark airports the worst hit.
4:15 a.m. ET: At least 12 deaths have been blamed on the latest storm.
12:30 a.m. ET: Boston's Logan International Airport received 16.2 inches of snow by midnight, the National Weather Service reported.
10:30 p.m. ET: U.S. airlines have pre-emptively canceled 214 arrivals and departures for Tuesday at the three major New York-area airports, as well as 100 at Boston Logan.
10:15 p.m. ET: Massachusetts Gov. Charlie Baker orders non-emergency executive branch employees to delay gong to work until 11 a.m. Tuesday.
8 p.m. ET: More than 4,200 arrivals and departures have been canceled at U.S. airports, including more than 1,000 flights at Chicago O'Hare, more than 800 at LaGuardia in New York, 650 at Boston Logan and 600 at Newark Liberty in New Jersey.
5:30 p.m. ET: Boston Mayor Marty Walsh announces that the city and the Patriots have decided to postpone the parade until Wednesday at 11 a.m., NECN reports.
5 p.m. ET: At least 9 deaths have been blamed on the weather Sunday and Monday.
4:45 p.m. ET: More than 1,250 flights into/out of the Chicago area have been canceled.
4:30 p.m. ET: Boston mayor announces schools will be closed on Tuesday.
3:06 p.m. ET: An accident on Interstate 95 in New York, on the Connecticut border, killed two people and injured one, according to New York State Police. All lanes of the highway are closed down at exit 22.
2:45 p.m. ET: Delays are reported on all but one of the rail lines that service Long Island, according to the Metropolitan Transportation Authority.
1:45 p.m. ET: Two of the three northbound lanes of the Maine turnpike are closed between York and Wells, due to a crash involving a tractor trailer, according to NECN.
1:43 p.m. ET: The number of canceled flights at Chicago’s O’Hare airport surpass 1,000, according to FlightAware.
1:30 p.m. ET: Interstate 91 north in Vermont is closed between exits 7 and 8 due to several collisions, NECN reported.
12:47 p.m. ET: Flights arriving to New York's JFK airport are delayed by an average of one hour and 40 minutes and flights arriving to Logan International Airport in Boston are delayed by an average of three hours and 43 minutes, according to the FAA.
12:36 p.m. ET: The Hudson-Bergen rail line, which services six towns in New Jersey, is suspended due to wire problems, according to New Jersey Transit.
12:30 p.m. ET: A New York subway train is stuck without power and heat, and four others on the same line are stuck after an electrified third rail froze and lost power, closing down the 7 line, according to the Metropolitan Transportation Authority.
11:52 p.m. ET: The Cook County Jail in Chicago is put on lockdown after a third of the jail’s staff called in sick, largely due to the 20 inches of snow that fell in the city, according to NBC Chicago.
11:30 a.m. ET: Three of the four southbound lanes of Interstate 294 in Chicago, near Hickory Hills, were closed down due to a crash involving dozens of cars and tractor trailers, according to NBC Chicago.
11:00 a.m. ET: A ground stop is implemented for flights into New York’s La Guardia Airport, according to the FAA.
10:40 a.m. ET: Boston Mayor Marty Walsh warns residents to take precautions in the extreme cold forecast for Monday night and early Tuesday morning. He also schedules the Patriots’ Super Bowl celebration parade for 11 a.m. Tuesday. The temperature at that point should be 15 degrees, according to Weather.com.
10:12 a.m. ET: The state of Massachusetts says traffic is being diverted off Interstate 93 in Quincy because of a truck stuck in the snow.
9:34 a.m. ET: More than 2,800 flights have been canceled at U.S. airports Monday, according to FlightAware. That includes roughly half of all scheduled flights into and out of Newark in New Jersey and Logan in Boston.
7:55 a.m. ET: New Jersey Transit announces half-hour delays on rail and bus lines. Tickets will be cross honored all day on bus and rail lines, NJ transit said.
7:33 a.m. ET: Punxsutawney Phil sees his shadow, which doesn’t have an immediate effect on the storm, but spells six more weeks of winter.
6:16 a.m. ET: Classes at Newark Public Schools in New Jersey are canceled, according to the district.
6:00 a.m. ET: Parking ban goes into effect in Boston, according to a statement from the city. Officials encourage people to use public transportation. The speed limit on the Massachusetts Turnpike has reduced to 40 mph, and the speed limit on all major highways in New Hampshire is down to 45 mph, NECN reported.
5:48 a.m. ET: Chicago deploys 150 additional pieces of heavy equipment to focus on clearing streets, removing snow piles and dealing with accumulations near hospitals, police and fire stations. The city's "full fleet of snow removal vehicles have been combating a winter storm system for 33 continuous hours," the Department of Streets and Sanitation said in a statement.
5:08 a.m. ET: More than 2,300 flights have been canceled at U.S. airports Monday, according to FlightAware.
4:18 a.m. ET: Speed restrictions have been imposed on I-90 due to snowy weather.
3:54 a.m. ET: Acting New Jersey Gov. Kim Guadagno has advised motorists "to stay off the roads so our transportation crews can do their job" into Monday morning. Non-essential state employees were authorized to start at 10:30 a.m. Road conditions are available here.
3 a.m. ET: Bundle up! Here's the latest forecast from The Weather Channel.
2:24 a.m. ET: The storm had brought as much as 18 inches of snow to some areas by early Monday.
11 p.m. ET Sunday: More than 2,000 arrivals and departures have now been canceled Monday at U.S. airports, including 573 at Newark, New Jersey, 541 at Chicago O'Hare and 325 at Boston Logan.
8:10 p.m. ET: Chicago Public Schools say classes are canceled Monday.
7:10 p.m. ET: Amtrak says it's planning a normal Monday schedule, with some modifications to Acela Express and Northeast Regional service.
7 p.m. ET: Toledo, Ohio, Public Schools cancel classes for Monday.
4:55 p.m. ET: The Detroit Public Schools say all classes and Central Office operations will be closed Monday.
4:30 p.m. ET: Chicago's O'Hare says 1,300 flights have already been canceled.
4:20 p.m. ET: New York Mayor Bill de Blasio says that subways and buses so far are expected to be "fully operational" and that schools will be open Monday, but "at 3 or 4 a.m. if things happen differently, we may reconsider."
4:15 p.m. ET: Connecticut Gov. Dannel Malloy orders the state Emergency Operations Center to open at 4 a.m. and says non-essential state employees should delay reporting to work until 10 a.m.
3:40 p.m. ET: Boston Public Schools will be closed Monday, Mayor Marty Walsh announced.
2:02 p.m. ET: There is a ground stop at Detroit's airport due to snow and ice, according to the Federal Aviation Administration.
1:56 p.m. ET: The Port Authority of New York and New Jersey has canceled its planned six-hour full closings of the Bayonne Bridge scheduled for Monday and Tuesday. Depending on the weather, the first six-hour daytime closing will occur Wednesday. The Port Authority is planning a delayed 10 a.m. opening of its port terminals Monday, depending on the severity of the weather.
12:57 p.m. ET: Multiple parts of Interstate 80 in Nebraska are closed because of crashes, according to the state Roads Department.
12:02 p.m. ET: Chicago O'Hare International Airport says weather is delaying arrivals an average of 7 hours and 26 minutes.
10:50 a.m. ET: Chicago announces that the Adler Planetarium will close at 1 p.m.
10:35 a.m. ET: Madison, Wisconsin, declares a snow emergency, which is set to be in effect until 7 a.m. Tuesday.
9:35 a.m. ET: According to FlightAware.com, total delays within, into, or out of the U.S. are 570. Total cancellations within, into, or out of the U.S.: 1,780
More than half of flights into Chicago's two airports (O'Hare and Midway) are canceled Sunday. Nearly 30 percent of flights into or out of Newark Airport in New Jersey on Monday are canceled.
NBC News' Shamar Walters contributed to this report.