Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 259 AM EST Fri Dec 13 2019 Valid 12Z Fri Dec 13 2019 - 12Z Sun Dec 15 2019 ...Heavy snow in the mountains of the Pacific Northwest and Intermountain West... ...Showers and rain/freezing rain over parts of the Southeast and Appalachiansy... ...A wet, wintry, and windy Saturday in the Northeast, lake effect snow showers possible late Saturday ... A stream of Pacific moisture accompanied by several Pacific disturbances will produce snow across the Cascades, Sierra Nevada, and the Northern and Central Rockies today and into the weekend. Snow totals will be heavy in the highest elevations with snow being measured in feet in parts of these mountain ranges. The NWS has issued Winter Storm Warnings and Winter Weather Advisories across the higher elevations of the West that will continue into the weekend. As an upper-level trough dives south into the the South Central U.S. as a surface low pressure system strengthens in the Gulf of Mexico. This storm will tap into Gulf of Mexico and Atlantic moisture causing showers to increase in coverage eventually overspread the Southeast on Friday morning. Severe weather is also possible across Northern Florida, Southern Georgia, and Southern South Carolina Friday afternoon. Further north, sub-freezing temperatures in the Southern and Central Appalachians will set the stage for areas of rain/freezing rain. In preparation for potentially icy conditions Friday morning and early afternoon, the NWS has issued Winter Weather Advisories from Western North Carolina to the Appalachians bordering the Mason-Dixon line. The storm will strengthen and track up the Eastern Seaboard Friday night and reach the Northeast on Saturday. Rain will be the primary precipitation type across much of the Northeast. Northern New England will briefly start out as snow or a wintry mix Friday afternoon before changing over to all rain Friday night. Rainfall totals in excess of one inch is likely for areas along and east of I-95. Lake effect snow showers will form down wind of the Lakes as cold temperatures and brisk northwest winds return. Some accumulating snowfall is likely with locally heavy amounts possible. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php