Winter Storm impacts begin over much of the interior Northeast andparts of central New England tonight...Excessive Rainfall possible over coastal Northeast tonightHeavy Snow over the Sierra Nevada on Thursday; High Winds from theGreat Basin to Four Corners region on Thursday and Friday.A powerful mid-level low will continue to power a dynamic low pressuresystem moving from the Midwest into East Coast over the next couple ofdays. Showers and thunderstorms will spread across parts of theMid-Atlantic/Northeast Coasts tonight. Some intense storms may developaround a triple point low propagating from the New Jersey Coast up throughthe southern New England coast tonight. Therefore, a corresponding SlightRisk (at least 15%) of Excessive Rainfall leading to Flash Flooding is ineffect from northern New Jersey through New York City and into southernConnecticut. Heavy Snow will develop over parts of the interior Northeastand central New England tonight and will continue into Thursday beforeweakening into snow showers on Friday beneath a meandering mid-level lowaround Downeast Maine. Widespread snowfall accumulations of over a footare likely across portions of northern upstate New York andcentral/northern New England, with isolated amounts exceeding 2 feetpossible over parts of southern Maine and eastern New Hampshire by Fridayevening. Meanwhile, snow showers will occur over the Central Appalachianswith accumulations between 6-12 inches possible over the next two days.Another deep mid-level trough will support unsettled weather across muchof the West over the next couple of days. Heavy Snow will develop overparts of the Northern Rockies tonight and then the Sierra Nevada Thursdayafternoon through that evening. Anywhere between 1-2 feet of snow mayaccumulate over those areas by Friday night. This system will alsogenerate strong winds over the Central Great Basin Thursday afternoonwhich will expand into the Four Corners region on Friday.