Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 209 PM EST Mon Jan 21 2019 Valid 00Z Tue Jan 22 2019 - 00Z Thu Jan 24 2019 ...Heavy rain possible over parts of the Olympic Peninsula and the Tennessee Valley into parts of the Lower Mississippi Valley... ...Heavy snow possible for the Upper Great Lakes and parts of the Middle Mississippi Valley as well as parts of the Northern Cascades... ...Cold temperatures over the Northeast/Mid-Atlantic will modify... A storm over the Central High Plains will move northeastward to the Great Lakes by Wednesday. The system will produce snow over the Upper Midwest, Northern/Central Rockies, and Great Basin that will end over the Great Basin overnight Monday. Snow will also move into the Upper Great Lakes overnight Monday. Overnight Tuesday, the snow will end over the Northern/Central Plains. Also overnight Tuesday, snow will develop along the northwestern edge of the precipitation shield along the associated front. By Tuesday morning, rain will develop over parts of the Lower/Middle Mississippi Valley and parts of the Central/Southern Plains that will move eastward to parts of the Lower Great Lakes to the Central/Western Gulf Coast by Wednesday. In addition, onshore flow off the Atlantic will aid in producing rain over parts of the Southeast overnight Tuesday into Wednesday. Meanwhile, onshore flow off the Pacific will aid in developing rain and higher elevations snow over parts of the Pacific Northwest early Tuesday morning into Wednesday. Snow will also develop over parts of the Northern Rockies on Tuesday afternoon into Wednesday. Elsewhere, snow associated with deep low over the Canadian Maritimes will slowly wind down over the Northeast overnight Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php