WASHINGTON (AP) — The storm that is threatening 60 million Americans in the eastern third of the nation in just a couple of days with high winds, drenching rains, extreme tides, flooding and probably snow is much more than just an ordinary weather system. It's a freakish and unprecedented monster.
How did it get that way?
Start with Sandy, an ordinary late summer hurricane from the tropics, moving north up the East Coast. Bring in a high pressure ridge of air centered around Greenland that blocks the hurricane's normal out-to-sea path and steers it west toward land.
Add a wintry cold front moving in from the west that helps pull Sandy inland and mix in a blast of Arctic air from the north for one big collision. Add a full moon and its usual effect, driving high tides. Factor in immense waves commonly thrashed up by a huge hurricane plus massive gale-force winds.
Do all that and you get a stitched-together weather monster expected to unleash its power over 800 miles, with predictions in some areas of 12 inches of rain, 2 feet of snow and sustained 40- to 50 mph winds.
"The total is greater than the sum of the individual parts" said Louis Uccellini, the environmental prediction chief of the National Oceanic and Atmospheric Administration meteorologists. "That is exactly what's going on here."
This storm is so dangerous and so unusual because it is coming at the tail end of hurricane season and beginning of winter storm season, "so it's kind of taking something from both — part hurricane, part nor'easter, all trouble," Jeff Masters, director of the private service Weather Underground, said Saturday.
With Sandy expected to lose tropical characteristics, NOAA is putting up high wind watches and warnings that aren't hurricane or tropical for coastal areas north of North Carolina, causing some television meteorologists to complain that it is all too confusing. Nor is it merely a coastal issue anyway. Craig Fugate of the Federal Emergency Management Agency told reporters Saturday: "This is not a coastal threat alone. This is a very large area. This is going to be well inland."
Uccellini, who estimated that 60 million people will feel the storm's wrath somehow, said: "This storm as it grows and moves back to the coast on Monday and Tuesday, the circulation of this storm will extend all the way from the Midwest, the Ohio Valley, toward the Carolinas up into New England and southern Canada. It's really going to be an expansive storm system."
It's a topsy-turvy storm, too. The far northern areas of the East, around Maine, should get much warmer weather as the storm hits, practically shirt-sleeve weather for early November, Masters and Uccellini said. Around the Mason-Dixon line, look for much cooler temperatures. West Virginia and even as far south as North Carolina could see snow. Lots of it.
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