Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 239 AM EST Mon Jan 29 2018 Valid 12Z Mon Jan 29 2018 - 12Z Wed Jan 31 2018 ...Heavy rain possible for the Olympic Peninsula... ...Heavy snow possible for the Northern Cascades... ...Snow possible for the Upper Great Lakes... ...Snow possible for the Lower Great Lakes into the Eastern Ohio Valley and Central Appalachians... Low pressure off the Southeast Coast will move northeastward to the Canadian Maritimes by Tuesday evening. The storm will produce rain over the Mid-Atlantic into the Southeast with rain and embedded thunderstorms over Florida. The rain will end over the Southeast on Monday afternoon and the Mid-Atlantic by late Monday night. The rain with embedded thunderstorms will end over Florida by Tuesday morning. By Monday evening, the system will produce snow over Southern New England that will end by Tuesday evening. In addition, strong upper-level energy over the Ohio/Tennessee Valleys will move eastward off the Mid-Atlantic Coast overnight Tuesday. The system will produce snow over parts of the Great Lakes that will expand into the Lower Great Lakes/Eastern Ohio Valley into the Central Appalachians by Monday evening. The snow will slowly move eastward to the Mid-Atlantic/Central Appalachians by Tuesday morning. Furthermore, the snow will begin to move off the Mid-Atlantic Coast and parts of the Northeast by Tuesday evening. Meanwhile, a front moving onshore over the Pacific Northwest will move inland to the Northern Plains westward across parts of the Northern Rockies into the Great Basin by Tuesday evening. The storm will produce rain over the northwest portion of Washington State on Monday morning that will expand inland into other parts of the Pacific Northwest by Monday evening. As the front moves inland, the snow levels lower as snow develops over the higher elevations of the Northwest Monday afternoon into evening. Overnight Monday, snow moves into the Northern Rockies and rain moves into parts of Northern California. The snow continues over the Northern Rockies/Northern Plains through Tuesday evening. Likewise, rain and higher elevations snow continues over the Pacific Northwest also through Tuesday evening. Additionally on Tuesday, as the boundary moves into the Northern Plains, snow will develop over parts of the Northern Plains that will move into the Upper Mississippi Valley and the Upper Great Lakes by Tuesday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php