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National Weather at 305pm January 20 2005


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Late week snow

3:07 P.M. ET 1/20/2005


M. Ressler, Meteorologist, The Weather Channel





High pressure will bring a quiet but very cold Friday to the Northeast and Mid-Atlantic with daytime temperatures 10 to 30 degrees below average (below zero along the Canadian border to the 30s southern Virginia). On Saturday with the cold air still in place, a vigorous low pressure system will sweep from Kentucky to off the Delmarva Peninsula. Heavy snow will most likely rapidly spread across southern New York State, Pennsylvania, much of Maryland and New Jersey. North of this area, the snow will rapidly lessen. South of this area, snow will change to sleet and freezing rain across the western and northern portions of Virginia, the northern Chesapeake Bay area and the state of Delaware. Southeast Virginia and the Delmarva will probably see a frozen mix change to rain. Later in the day, the snow will continue to advance eastward across southern New England. By Sunday morning, most of the snow will end as the storm moves out to sea. Snow could linger over Cape Cod Sunday. Very light snow could linger along the immediate coast from Long Island to Norfolk. Snow accumulations from southern New York and the northern and central portions of the Mid-Atlantic to southern New England could be over 6 inches. The cold will be reinforced for Sunday and Monday with moderating temperatures toward midweek.



The strongest clipper (fast-moving) low-pressure system in the series will streak from northeast Montana early Friday to West Virginia by Saturday evening. North of the low track, heavy snow will fall from the eastern Dakotas and Minnesota to Lower Michigan and the northern Ohio Valley. There will be a narrow fringe of sleet and freezing rain just south of the snow band and some rain in Kentucky on Saturday. Snow accumulations will be over 6 inches at many locations along the snow band. A strong Canadian high in the wake of the storm will temporarily chill the temperatures in the Plains Saturday and bring temperatures well below average from the Mississippi Valley eastward Sunday as the region goes quiet.



Temperatures will be well above average across the West right through the middle of the upcoming week with only a temporary cool down east of the Rockies on Saturday. Morning fog will continue to plague the valleys of the Great Basin and the Central Valley of California. Rain will increasingly clip areas west of the Cascades, particularly on Saturday and Monday. Western Washington picked up between 3 and 15 inches of rain early in the week so renewed heavy rain will quickly bring a new round of flooding.



After a quick overnight shot of snow for northern North Carolina, the new storm moving through the Midwest and Northeast over the next few days will sideswipe the South. Showers will move through the Tennessee Valley on Saturday with showers and a few thunderstorms extending all the way to the northern Gulf Coast ahead of a cold front. Later Saturday into Sunday, the precipitation will move across the Southeast. Lingering cold air over the Carolinas could cause an initial burst of sleet and freezing rain across interior North Carolina before the changeover to rain. Meanwhile showers will push eastward through the remainder of the Southeast. On Sunday, flurries could punctuate the end of the storm from the southern Appalachians to the Outer Banks but no accumulation is expected. Most of the South will turn cold Sunday into Monday but warm up quickly by the middle of the upcoming week.

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