Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 432 PM EDT Tue Apr 10 2018 Valid 00Z Wed Apr 11 2018 - 00Z Fri Apr 13 2018 ...Moderate to heavy snow possible over parts of the Northern Rockies, Cascades, Sierras, and parts of the Olympic Peninsula... ...Snow possible from the Northern Plains to the Upper Great Lakes... A front over the Pacific Northwest to Central California will move eastward to the Northern High Plains/Northern Rockies southwestward to the Great Basin/Southern California by Wednesday morning will be reinforced by another front moving onshore Wednesday afternoon into Wednesday evening. A third boundary moving southward out of Central Canada will link with the first front over the Middle Mississippi Valley/Great Lakes by Wednesday evening, too. By Thursday morning, the boundary will extend from the Great Lakes to the Central High Plains into the Northern Rockies southwestward to Southern California. The first system will produce rain and highest elevation snow over the Pacific Northwest into Northern/Central California eastward to the Northern Rockies by Tuesday evening. As the associated upper-level trough moves inland, the snow levels will lower over the region. Overnight Wednesday into Thursday morning, most of the precipitation over the interior Pacific Northwest and interior Northern/Central California along with parts of the Great Basin will be snow. Rain will continue over the coastal regions of the Pacific Northwest and California through Thursday morning. By Wednesday morning, low pressure along the aforementioned front over the Northern High Plains will move eastward to the Upper Great Lakes by Thursday morning. The storm will produce snow and rain over parts of the Northern Plains by Wednesday afternoon that will move eastward into parts of the Upper Mississippi Valley by Wednesday evening and into the Upper Great Lakes/Ohio Valley by Thursday morning. Meanwhile, a forth front over Southern Florida will move southeastward off Southeastern Florida by Wednesday morning. The system will produce showers and thunderstorms over parts of Florida that will similarly move off the southeastern coast of Florida by late Wednesday morning. In addition, upper-level energy over the Northeast will move northeastward into the Canadian Maritimes by Wednesday morning. The energy will aid in producing light snow over parts of the Northeast that will end overnight Tuesday. Additionally, upper-level energy over the Minnesota/Canadian border will move across the Great Lakes into Northern New England by Thursday morning. The energy will produce snow and rain over parts of the Upper Great Lakes that will move eastward into the Lower Great Lakes/Northeast by Wednesday evening and waning over Northern New England by Thursday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php