Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 253 AM EST Tue Jan 03 2017 Valid 12Z Tue Jan 03 2017 - 12Z Thu Jan 05 2017 ...Heavy snow possible over the Sierras... ...Heavy rain possible over the Northern/Central California Coast... ...Snow possible from Northern California/Pacific Northwest eastward to Central High Plains... ...Temperatures will be 20 to 35 degrees below average over the Northern/Central High Plains and Northern Rockies... A complex storm over the eastern third of the country will move from the Ohio Valley to Eastern Canada by Wednesday evening. The system will produce showers and thunderstorms over parts of the Southern Mid-Atlantic/Southeast that will move off the coast overnight Tuesday. Rain and snow will develop over the Upper/Middle Mississippi Valley and Great Lakes/Ohio Valley to the Northeast/Northern Mid-Atlantic that will change over to mostly snow downwind from the Great Lakes into the Northeast by Wednesday evening. On Tuesday morning into Wednesday morning along the rain/snow line, areas of rain/freezing rain will develop over parts of Northern New England. Meanwhile, an upper-level low will remain over the Pacific Northwest through Wednesday evening. The circulation around the upper-low will aid in streaming a plume of moisture into California on Tuesday into Wednesday. The storm will produce coastal rain and higher elevation snow over parts of the Pacific Northwest and Northern/Central California through Wednesday evening. The rain will be heavy at times along the California Coast. Likewise, the snow will be heavy over the Sierras also through Wednesday. In addition, snow will develop over parts of the Great Basin into the Central/Northern Rockies that will continue on Tuesday and Wednesday. On Wednesday, snow will develop over parts of the Central Plains. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php