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The Pacific jet stream is still roaring. Late last week a winter storm battered the West Coast with up to 6″ of rain and several feet of snow in mountainous areas. This same storm system is soon expected to become reinvigorated east of the Rocky Mountains with Gulf of Mexico moisture. The low will generate life-threatening, flooding rains across much of the South while spreading snow and rain across portions of the Midwest and Northeast.The low will slowly trek eastward toward the southern Plains throughout the first half of the week, but will ensnare itself trying to cross the Rocky Mountains. Its parent upper-level support will escape ahead of the surface low pressure system and help pull moisture northward out of the Gulf of Mexico. The subtropical Gulf air will collide with a much colder airmass of Canadian origin. The collision of the two airmasses will produce heavy snow in…