Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 229 PM EST Thu Dec 19 2024 Valid 00Z Fri Dec 20 2024 - 00Z Sun Dec 22 2024 ...Light to moderate snow, with locally higher amounts, will develop over parts of the Great Lakes, Central Appalachian, and Northeast... ...Winter Weather Advisories and Warnings over parts of the Upper Midwest... ...Light rain over parts of the Northwest Coast... On Thursday, low pressure over the Middle Mississippi/Ohio Valleys will move eastward to the Mid-Atlantic before moving off the East Coast overnight Friday. The system will produce light to moderate snow, with locally higher amounts over parts of the Great Lakes/Ohio Valley region through late Friday night. Additionally, a northeast wind will create moderate to heavy lake-enhanced snow over parts of the northeastern coast of the Lower Peninsula of Michigan overnight Thursday into Friday. The storm has prompted Winter Weather Warnings and Advisories over parts of the Upper Midwest. Overnight Thursday, light to moderate snow will develop over parts of the Northeast, extending into Saturday. By Friday afternoon, light snow will develop over parts of the Central Appalachians, becoming light to moderate overnight Friday into Saturday. In the wake of the storm, temperatures will be 10 to 15 degrees below average from the Great Lakes and Middle/Lower Mississippi Valley eastward to the coast. Moreover, upper-level energy will produce light snow over parts of the Northern Plains/Upper Mississippi Valley from Friday afternoon into Saturday. Furthermore, on Thursday, low pressure near the southern Mid-Atlantic Coast will produce light rain over parts of the region through Saturday night. Also, light rain will develop over parts of the northern Mid-Atlantic Coast on Friday afternoon, changing over to snow over the New Jersey Coast by Saturday morning. Meanwhile, multiple fronts over the Eastern Pacific will move close to the West Coast and dissipate, bringing a few rounds of moisture into the coast. Light rain will develop over parts of the Northwest Coast overnight Thursday, ending by Friday morning. However, a second round of moisture will create light rain over parts of the Pacific Northwest Coast by Friday afternoon. On Saturday, a stronger plum of moisture will produce light rain over parts of Northwest and Northern/Central California, with snow at the highest elevations. Ziegenfelder Graphics available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php