Updated at 8:21 p.m. ET -- Superstorm Sandy strengthened Monday as it bore down on the East Coast, shutting down public transportation and leading to the first weather-related closure of U.S. stock market in 27 years.
Watch now: Multiple live video streams of Sandy coverage
Forecasters say the massive storm has the potential to be one of the most damaging ever to hit the United States. Here is a look at the figures that make up the storm. We'll be updating these numbers throughout the day.
Number of people affected: Expected to affect between 50 million and 60 million;
Number of deaths blamed on Sandy: 65 in the Caribbean.
Size of storm: Nearly 1,000 miles wide;
States impacted: Nine states, Washington, D.C., and a coastal county in North Carolina have declared states of emergency;
Ground speed of storm: 28 miles per hour as of 2 p.m. ET Monday;
Speed of winds: 90 mph. Tropical storm-force winds extended 485 miles from the center;
Number of flights canceled: More than 10,000 flights were canceled through Tuesday, according to FlightAware.com, and that number is expected to grow into Wednesday;
Number of people told to evacuate: 375,000 in NYC; 50,000 in Delaware; 30,000 in Atlantic City, N.J.;
Number of customers without power: As of 2:59 p.m. ET, 3.1 million were without power, most of them in New York, New Jersey and Connecticut.
Get the latest news on Superstorm Sandy on NBCNews.com
Heaviest rainfall: Up to 12 inches in isolated regions of Mid-Atlantic states;
Inches of snow: Up to 12 inches in some areas expected. In addition, up to three feet of snow expected in the Appalachian Mountains from West Virginia to Kentucky;
Size of storm surge: 4 to 11 feet across much of the affected area;
BreakingNews.com's coverage of Sandy
Number of NYC students affected by Monday and Tuesday's school closure: 1.1 million;
Number of public transport riders without service Monday in NYC, Philadelphia, Washington, D.C., and New Jersey: More than 10 million;
Miles of subway track closed in New York City alone: Nearly 660;
FEMA’s estimate for potential wind damage alone: $2.5 to $3 billion;
Residential properties at risk of damage: Nearly 284,000, valued at $88 billion;
Number of Atlantic City casinos shut down: 12.
The Associated Press and Reuters contributed to this report.
