Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 259 AM EST Tue Jan 23 2018 Valid 12Z Tue Jan 23 2018 - 12Z Thu Jan 25 2018 ...Heavy snow and rain over parts of Maine... ...Heavy snow over the Cascades, northern Sierra Nevadas, Blue Mountains, Bitterroots and Northern Rockies... ...Rain/freezing rain possible over parts of Northern New England into parts of the Upper Great Lakes... ...Heavy rain possible over the Pacific Northwest... The winter storm that brought widespread snow and freezing rain to the Central/Northern Plains and Upper Mississippi Valley on Monday will continue to lift northeast through the lower Great Lakes today and exiting New England by very early on Wednesday. Precipitation may go through a brief transition period where freezing rain will occur this afternoon; but will change over to all snow as it continues across portions of the Great Lakes region and the Northeast through Wednesday. Winter Weather Advisories and Winter Storm Warnings remain in effect for parts of the Great Lakes region and much of New England. Additionally, as the associated cold front passes through the Ohio Valley, snow will will develop and spread to the higher elevations of the Central Appalachians, as well as, parts of the Northern Mid-Atlantic by late afternoon/evening. Showers and thunderstorms have developed along and ahead of the trailing front and are spreading eastward toward the Mid-Atlantic and Southeast. The showers and thunderstorms are expected to exit the Eastern Seaboard tonight. The Pacific Northeast and northern California will remain in a persistent wet pattern as upper-level energy and onshore flow spreads rain and mountain snow across the region. A plume of moisture ahead of an upper-level trough will move into parts of the Pacific Northwest today and will expand south into Northern California tonight and Wednesday. Coastal rain and higher elevation snow is forecast for much of Northwest today and for to the Northern Intermountain Region by Wednesday. Snow will be heavy for most of the Cascades, northern portions of the Sierras Nevadas, the Blue Mountains, the Bitterroots and the Northern Rockies in this setup. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php