Images from the MTA of Sandy damage.
NEW: Sandy has killed at least 33 people in the United States
In Queens, a fire is thought to have destroyed 80 houses
Obama to tour damage in New Jersey on Wednesday
(CNN) -- A day after it launched a punishing strike on the East Coast of the United States, Superstorm Sandy remained a threat Tuesday.
The storm made landfall along the coast of southern New Jersey on Monday night, but its mammoth size affected a much wider area -- and continued to do so as it shuffled northward toward Canada, leaving at least 33 U.S. deaths in its wake.
By Tuesday afternoon, nearly 7.9 million customers were without power in 15 states and Washington, according to the latest CNN estimate.
President Barack Obama signed disaster declarations for New York and New Jersey. He has signed emergency declarations for other states and the nation's capital.
Nearly 11,000 people spent Monday night in scores of Red Cross-operated shelters in the hard-hit mid-Atlantic region.
Here's a look at how Sandy has affected the United States and Canada.
-- The death toll stands at two, according to state police spokesman Lt J. Paul Vance. The victims -- one of them a firefighter in Easton -- were killed by falling trees.
-- Some 458,349 customers were without power, according to utilities.
-- Power went out for 42,585 customers, authorities said. Delmarva Power said it cannot predict how long it will take to restore power.
-- Gov. Jack Markell scaled back driving restrictions Tuesday morning.
DISTRICT OF COLUMBIA
-- Officials said 11,845 customers were without power.
-- Metro transportation bus and rail service was restored on modified schedules. The system expected normal service to resume for Wednesday morning's commute.
-- About 60,149 homes and businesses were without electricity, according to Central Maine Power.
-- Two people have died, an emergency management official said. A falling tree hit a house, killing a man inside. A car accident blamed on the storm accounted for the other death.
-- Raw sewage was leaking from a plant in Howard County, emergency management spokeswoman Karen Spicer said. About 2 million gallons of sewage per hour were pouring out of the Little Patuxent Water Reclamation Plant as a result of a power outage.
-- Utilities said 332,704 customers were without power.
-- A state of emergency remained in effect.
-- More than two feet of snow had fallen in Western Maryland, forecasters say.
-- State employees returned to work Tuesday morning, according to the governor's office.
-- Utilities said 262,607 customers were without power.
-- Gov. Deval Patrick said utilities plan to pair tree removal and power restoration crews, rather than having them work separately, so that work can be done more efficiently.
-- New Hampshire's power suppliers reported 154,009 customers without electricity.
-- Gov. John Lynch urged drivers to stay off the state's roads.
-- The governor asked the National Guard to place 100 troops on active duty, with 100 more on standby.
-- Obama will travel Wednesday to New Jersey to join the governor in viewing damage, talking with people recovering and thanking first responders, the White House said.
-- Emergency workers saw widespread damage on every New Jersey rail line.
-- A tidal surge stranded rail cars on the New Jersey Turnpike.
-- Houses sat in the middle of Route 35. The amusement pier at Seaside Park was half washed out, and amusement park rides were in the ocean.
-- Sandy has killed at least three in the Garden State. Two people in Morris County died Monday evening when a tree fell on their car, authorities said. A male of unknown age was killed in Hawthorne when a tree fell on a house, town Fire Chief Joseph Speranza said.
-- A dam or levee broke early Tuesday in the town of Moonachie, said Jeanne Baratta, chief of staff for the Bergen County executive, which handles operations for the county government. Rescues were under way in Moonachie, Little Ferry and Carlstadt, where 4 to 5 feet of water had flooded streets. People were standing on their roofs.
-- Sandy left 2,356,495 customers without electricity.
-- Flooding was reported in portions of Atlantic City and Hoboken.
-- New Jersey Transit service was suspended indefinitely. Flooding also forced the closure of Newark Liberty International and Teterboro airports.
-- The Garden State Parkway in New Jersey was open, but more than 200 other state roads remained closed, Gov. Chris Christie said Tuesday in a Twitter message.
-- Sandy killed 18 people in New York City alone, according to Mayor Michael Bloomberg.
-- Outerbridge Crossing, George Washington, Goethals and Bayonne bridges were reopened, the Port Authority of New York and New Jersey said. The Tappan Zee Bridge, over the Hudson River, was opened, the governor's office said.
-- A record-setting power outage darkened a large Manhattan hospital, triggering a patient evacuation.
-- About 2,063,773 customers were without power, suppliers said.
-- New York's LaGuardia International Airport was not expected to reopen Wednesday, but John F. Kennedy International Airport likely will reopen, Cuomo said.
-- New York University Langone Medical Center went dark late Monday. More than 200 patients were evacuated after backup power failed, said hospital spokeswoman Lisa Greiner.
-- New York City Mayor Michael Bloomberg said more than 80 houses were lost in a fire in the Breezy Point section of Queens.
-- Water spilled into subway tunnels connecting Manhattan with Brooklyn and with Queens, said Metropolitan Transit Authority spokesman Aaron Donavan. The water will have to be pumped out. The subway system remains closed entirely, as does MTA's bus system.
-- Two roadway tunnels linking Manhattan to the two boroughs took on water and seven MTA bridges were closed because of high winds.
-- Obama declared a disaster in New York state, freeing federal funds for the counties of Bronx, Kings (Brooklyn), Nassau, New York, Richmond (Staten Island), Suffolk and Queens.
-- A crane atop a luxury Manhattan skyscraper under construction partly collapsed Monday, leaving its arm hanging over West 57th Street.
-- The captain of HMS Bounty, a tall sailing ship used as a prop in classic adventure films, was missing after Hurricane Sandy forced the crew to abandon ship some 90 miles off Cape Hatteras. Two helicopter crews saved 14 people stranded in the Atlantic Ocean on Monday. A deckhand missing from the 180-foot ship was found dead, the Coast Guard said. The guard was searching for the missing captain about 125 miles southeast of Hatteras.
-- On Monday night, a 25-year-old driver died when a tree fell on his truck.
-- About 79,856 customers were without power.
-- Gov. Beverly Perdue declared a state of emergency for 24 counties in the western part of her state because of snow.
-- High winds, flooding and snow have hit parts of the state.
-- Suppliers said 238,816 homes and businesses lost power.
-- An 8-year-old boy struck by a tree limb in Susquehanna County was pronounced dead at a residence in Franklin Township, state police said.
-- Gerald Witman, 62, of Oley, was killed when a falling tree struck him, State Police spokesman David Beohm said.
-- Another person died in a traffic accident in Somerset County, Gov. Tom Corbett said.
-- Utilities said 1,190,206 homes and businesses were without power.
-- Thirty-eight Pennsylvania counties were under emergency declarations, and 1,700 National Guard troops were on the ground, Corbett said.
-- The union's smallest state, with slightly more than 1 million residents, reported 114,710 customers without electricity. Outages were concentrated in the southern part of the state, affiliate WPRI-TV in Providence reported.
-- Few used public evacuation shelters. Widespread debris cluttered the roads, "but no casualties and relatively little alarm," WPRI said.
-- Power suppliers said 692 homes and businesses had no power.
-- Two storm-related traffic fatalities were reported by the Office of the Chief Medical Examiner. The deaths occurred in the state's central region.
-- Sandbags were piled inside restaurants in the Old Town section of Alexandria along the banks of the Potomac River.
-- The number of customers without power stood at 272,562.
-- The state asked that only its essential state employees report to work Tuesday, the governor's office said.
-- A woman was killed when her car collided with a cement truck after the storm dumped 5 inches of snow on the town of Davis, authorities said.
-- West Virginia declared a state of emergency as Sandy dumped snow and rain in the Appalachian Mountains.
-- Utilities said 344,507 customers had lost power.
-- Twelve counties were under a blizzard warning until 6 p.m.
-- An estimated 800 outages occurred across Ontario, affecting about 150,000 customers, the provincial energy minister said.
-- The hardest-hit Ontario communities were Toronto, Waterloo, Peterborough, Owen Sound and Sarnia.