Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 232 AM EST Tue Jan 30 2018 Valid 12Z Tue Jan 30 2018 - 12Z Thu Feb 01 2018 ...Rain possible for the Pacific Northwest... ...Heavy snow possible over the Northern Cascades and the Upper Great Lakes... ...Snow possible for the Northern Rockies and parts of the Lower Great Lakes into the Northeast... A deep upper-level trough over the Mid-Atlantic/Lower Great Lakes will move off the Northeast Coast overnight Tuesday. The system will produce light snow over parts of the Lower Great Lakes/Central Appalachians into parts of the Mid-Atlantic and New England that will end by Tuesday evening. Meanwhile, a front over the Northern High Plains/Northern Rockies into parts of the Northwest will move eastward to the Upper Great Lakes/Middle Mississippi Valley/Southern High Plains by Wednesday evening. The storm will produce snow and lower elevation rain over parts of the Northern Intermountain Region/Northern Rockies that will continue over the region through Wednesday evening. The snow will expand into parts of the Northern High Plains on Wednesday into Wednesday evening. As the boundary moves eastward, snow will develop over parts of the Upper Mississippi Valley by Tuesday afternoon expanding into the Upper Great Lakes overnight Tuesday with the snow ending over the Upper Mississippi Valley by Wednesday morning. Also on Wednesday the snow will move eastward into the Lower Great Lakes into parts of the Northeast by Wednesday evening. Elsewhere, onshore flow over the Pacific Northwest will produce coastal rain and higher elevations snow over parts of the Northwest through Wednesday evening into Thursday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php