Blame Warming Atlantic for the 'Snow Bomb' Roaring Toward NYC
Winter storms in the Northeast U.S. are getting boost from warming oceans
The nor’easter about to tear up the U.S. East Coast with near-hurricane-force winds and fast-falling snow — as much as 10 inches of it in New York and more in Boston — is almost certain to intensify so rapidly that it will meet the definition of a bomb cyclone as it roars north. The technical term is “bombogenesis,” and it means the central pressure of a storm, a measure of its power, drops by at least 24 millibars in 24 hours.
The key ingredient of a weather bomb is the collision of cooler air with much warmer air, and that is on hand. A cold front from Canada dropped temperatures to a low of 17° Fahrenheit (-8° Celsius) in New York City’s Central Park overnight Wednesday into Thursday, while in the Atlantic Ocean, the water is warmer than normal. Cape May in New Jersey recorded a water temperature of 46°F, and in Georges Bank off Massachusetts, the ocean was 44.6°F, according to the National Data Buoy Center. Not exactly balmy, but enough to provide the grist for the bombogenesis mill.