Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 318 PM EST Sun Nov 26 2017 Valid 00Z Mon Nov 27 2017 - 00Z Wed Nov 29 2017 ...Heavy rain and snow for the Sierras... ...Heavy rain possible over the Pacific Northwest Coast and Heavy snow for the Cascades... ...Lake effect snow over parts of the Lower Great Lakes and Northern Appalachians... ...Temperatures will be 20 to 30 degrees above average for Central/Northern Plains and parts of the Southern High Plains... A front over the Northern Intermountain Region into the Great Basin and Southern California will move eastward to the Upper Great Lakes/Middle Mississippi Valley and the Central/Southern Plains by Tuesday. A head of the front, temperatures will be well above average over the Plains as a strong upper-level ridge will be over the High Plains until Monday evening. With the front moving inland, the snow levels will lower over the Northwest as heavy snow develops over the Cascades through Monday morning. Light snow will continue over the Cascades through Monday evening. Likewise, heavy rain will develop over the Pacific Northwest through early Monday morning. In addition, rain will develop over parts of Northern/Central California through Monday evening. Heavy rain and snow will also develop over the Sierras through Monday evening, too. Overnight Sunday, snow and lower elevation rain will develop over parts of the Northern Intermountain Range/Northern Rockies into parts of the Great Basin through late Monday night. The rain will be confined to the Olympic Peninsula Monday night into Tuesday morning. As the boundary begins to move onto the Plains, snow will develop over parts of the Central Rockies Monday evening into Tuesday. Additionally, the boundary will move into dry air over the Plains Monday evening into Tuesday. The front will be dry across the Northern/Central Plains Monday evening into Tuesday. Meanwhile, a weak front will move over the Lower Great Lakes into the Northeast through Monday evening. The system will produce light snow over parts of the Lower Great Lakes into the Northern Appalachians that will move into parts of the Northeast late Sunday night moving off the coast by Monday afternoon. Lakes effect snow will develop downwind of Lakes Ontario on Monday into Monday evening. Elsewhere, upper-level energy will move over the southern tip of Florida Monday afternoon into Tuesday. The energy will aid in producing showers and thunderstorms over the southern tip of Florida Monday evening into Tuesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php