Story has been updated 12/6/2010 2:00 pm....
A storm that will take shape by the middle of December will cross the country and could end up developing into a major snowstorm for portions of the mid-Atlantic and New England.
There are different storm track scenarios at this point that mean the difference between mostly rain or a potential blizzard along the Interstate 95 corridor from Washington, D.C., to Boston.
So far, Chief Long Range Forecaster Joe Bastardi has been correct with the Winter Forecast for the Northeast with his prediction that late November to December would be cold and stormy for many.
According to Bastardi, "Repetitive cold waves and the threats of storms will keep hitting parts of the East in the weeks leading up to Christmas."
"One or two of these storms has the potential to become a major snowstorm for portions of the mid-Atlantic and New England, including the storm that may hit the East from December 12-14."
Expert Senior Meteorologist Henry Margusity has also been warning about how the cold pattern in the East could soon yield the season's first major snowstorm.
Scenario One: Major Snowstorm for Interior Northeast
The storm would then cut across the interior Northeast in the first scenario. Mild air would be drawn into the I-95 corridor, making it a rainstorm for the big Northeast cities.
Scenario Two: Major Snowstorm for Interstate 95 Corridor
"If the storm brushes up the Eastern Seaboard, several inches of snow could lead to major travel disruptions in the big cities from Washington, D.C. to Philadelphia and New York City to Boston," according to AccuWeather.com Expert Senior Meteorologist Carl Erickson.
On top of heavy snowfall, blustery winds would add to this winter storm scenario by causing blowing snow and potential whiteout conditions at times.
Lake-effect snow to the lee of the Great Lakes would be likely to accompany this scenario as well with an arctic blast of air blowing across the relatively mild water of the Great Lakes.
Erickson points out that there is one other possibility with this storm, stating "One other scenario is that the storm takes shape too far off the coast, which would promote a frigid, dry northwesterly flow of air into the Interstate 95 corridor. If this were to occur, there would be potential for even more heavy lake-effect snow downwind of the Great Lakes."
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Peter sinks, UT (1985)
-69 degrees. All-time low for Utah
Moncton, New Brunswick, Canada (1992)
A 72 hour blizzard left 64" of snow.
Harlingen, TX (1998)
60 mph winds in a severe thunderstorm with marble - sized hail that accumulated a foot deep.