...Widespread rain and thunderstorms will spread from the Lower Mississippi Valley east and north through Friday.. A deep upper-level trough will continue moving eastward through the Plains, Mississippi Valley, and Ohio Valley through the end of the workweek. Gulf of Mexico and Atlantic moisture are expected to combine to create a heavy rainfall event for the eastern U.S.. Behind a secondary cold front on Friday, snow could mix in on the back edge of the precipitation across the Ohio Valley and into the Appalachians.
...Record warmth possible by Friday in the Mid-Atlantic region and Northeast...Gulf of Mexico and Atlantic moisture are expected to combine to create a heavy rainfall event for the eastern U.S. Widespread rainfall totals are forecast to be 1 to 2 inches across the Southeast and the Appalachians eastward, with higher widespread totals of 3 inches in the Florida peninsula, eastern North Carolina, and southern New England.
A series of strong storms will impact the northwestern coastline and mountains of the United States over the next few days. Currently, there are already numerous warnings out, and I-90 is actually closed in both directions over Snoqualmie Pass due to snowbound roads and spinouts. As per the Seattle/Tacoma AFD, atmospheric rivers of moisture will affect the region.
a well defined low pressure system slowly tracking eastward across the Mid-Atlantic region and slowly exiting out to sea by Sunday evening. The result has been copious amounts of rainfall from the southeast coast and Ohio Valley to southern New England. In fact, the rainfall from this event alone has resulted in some across the East Coast setting new annual rainfall records.
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A quick moving low pressure system will result in light snow this morning which transitions to rain later this morning into early afternoon, with a low to moderate potential for a light snow accumulation before changeover to rain. Local snow amounts of 1 to 2 inches cannot be ruled out, particularly across southwest Connecticut.
Accumulating snow from eastern New Mexico to Arkansas appears likely Friday into Saturday with snow totals of 3 to 6 inches, with locally higher amounts possible especially over the Texas Panhandle. South and east of the snow, a band of potentially hazardous freezing rain from roughly Lubbock, TX to Oklahoma City and into the Ozarks of northern Arkansas with accumulations in the .10 to .25 inch range is possible.
Snow will edge northward Saturday night, starting across the High Country of North Carolina then spreading across the entire area Sunday morning. Sunday morning the upper level low tracks over Tennessee and Kentucky increasing moisture transport over the wedge. The combination of upslope flow, strong warm air advection and isentropic lift will bring moderate to heavy snow to areas along and south of highway 460.