BRACE YOURSELVES 2 TO 3 FEET.Northeast Braces For Colossal Snowstorm....De Blasio: 'Biggest Snowstorm In The History Of This City'... 'Don't Underestimate'... 29 Million People Under Blizzard Warning... 7 States... Potential White-Out Conditions... Up To 36 Hours... 3,500 Flights Canceled... Track Winter Storm Juno... 'CRIPPLING AND POTENTIALLY HISTORIC'... 'Prepare For The Worst'... CRISIS MAP... RADAR... HAZARDS...

NEW YORK (AP) -- Northeast residents are girding for a "crippling and potentially historic" storm that could bury communities from northern New Jersey to southern Maine in up to 2 feet of snow.

The National Weather Service said the nor'easter would bring heavy snow, powerful winds and widespread coastal flooding starting Monday and through Tuesday. A blizzard warning was issued for a 250-mile stretch of the Northeast, including New York and Boston.Government officials began to activate emergency centers on Sunday as professional sports teams, schools and utilities hastily revised their schedules and made preparations.

"This could be a storm the likes of which we have never seen before," New York City Mayor Bill de Blasio told a news conference in a Manhattan sanitation garage where workers were preparing plows and salt for the massive cleanup on about 6,000 miles of city roadways.

In Massachusetts, Gov. Charlie Baker warned residents to prepare for roads that are "very hard, if not impossible, to navigate," power outages and possibly even a lack of public transportation.

Boston is expected to get 18 to 24 inches of snow, with up to 2 feet or more west of the city, and Philadelphia could see up to a foot, the weather service said. more