Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 351 PM EST Sun Mar 05 2017 Valid 00Z Mon Mar 06 2017 - 00Z Wed Mar 08 2017 ...Heavy snow possible over the Cascades... ...Heavy rain possible over parts of Northern California and the Pacific Northwest... ...Snow levels will be almost down to sea level over Oregon on Sunday into Monday... A deep upper-level trough over the Western portion of the country will move eastward to the Upper Great Lakes to Central Plains while forming an upper-level low over the Northern Plains by Monday evening. At the surface, the associated front will move from the Northern High Plains/Southern California eastward to the Great Lakes/Western Ohio Valley and the Southern Plains by Tuesday. The system will produce rain over California and the immediate coast a long the Northwest with snow over the higher elevations of Central California. Snow will also develop just inland over the Pacific Northwest and parts of Northern California through Tuesday morning. The snow will also extend inland to parts of the Northern High Plains and parts of Central/Southern Rockies through Tuesday. Rain will return to coastal regions of the Northwest and Northern California on Monday afternoon into Tuesday. Meanwhile, ahead of the storm, moisture from the Western Gulf of Mexico will stream northward as far north as the Great Lakes through Tuesday. Rain will develop over the Western Gulf Coast and into parts of the Lower Mississippi Valley that will expand northward over parts of the Western Ohio Valley by Monday morning. In addition, rain will develop north of the associated warm front over the Upper Great Lakes, expanding into parts of the Lower Great Lakes also by Monday morning. As the storm moves onto the Plains, showers and thunderstorms will develop over parts of the Middle Mississippi Valley on Monday expanding north and southward from the Upper Mississippi Valley to the Southern Plains by Monday evening. In the meantime, rain over the Great Lakes/Ohio Valley will expand into the Northeast/Northern Mid-Atlantic overnight Monday into Tuesday. Additionally, pockets of rain/freezing rain will develop over parts of Northern New England overnight Monday, too. Also Monday evening into Tuesday, the showers and thunderstorms will retreat to the Tennessee/Lower Mississippi Valleys and parts of Eastern Texas. Furthermore, rain over the Upper Mississippi Valley/Upper Great Lakes will expand southward to the Ohio Valley overnight Monday into Tuesday. Elsewhere, easterly flow off the Atlantic will aid in producing scattered light rain over parts of the Southeastern Coast of Florida Sunday evening into Tuesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php