Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 334 AM EST Mon Jan 02 2017 Valid 12Z Mon Jan 02 2017 - 12Z Wed Jan 04 2017 ...There is a slight risk of severe thunderstorms over the Central Gulf Coast... ...Heavy rain possible over the Central/Eastern Gulf Coast... ...Heavy snow possible for Northern California and the Sierras... ...Heavy snow from parts of the Northern Plains to the Upper Great Lakes... A storm over Texas will move northeastward to the Mid-Atlantic Coast by Tuesday evening. The system will produce showers and thunderstorms from parts of the Southern Plains to the Southeast that will move off the Southeast Coast by Tuesday evening. The showers and thunderstorms will move into parts of the Ohio Valley by Monday evening ending overnight Monday and likewise over the Southern Plains and Lower Mississippi Valley. Meanwhile, upper-level energy over the Northern Rockies/High Plains will move eastward to the Upper Great Lakes by Tuesday evening. The storm will produce snow over parts of the Northern/Central Rockies to the Upper Great Lakes by Monday morning. Snow will develop over parts of the Northeast on Monday evening into Tuesday evening. The snow will end over the Northern Plains by Tuesday morning and Upper Mississippi Valley by Tuesday evening. Rain will also develop over parts of the Middle Mississippi Valley into parts of the Great Lakes on Monday. Rain will also move into parts of the Northern Mid-Atlantic by Monday evening. Areas of snow will change over to rain over parts of the Middle Mississippi Valley, Great Lakes, and Northeast on Monday afternoon into Tuesday. Pockets of rain/freezing rain will develop over parts of the Middle Mississippi Valley, Great Lakes, and Northeast along the rain/snow line on Monday into Tuesday. In addition, an upper-level low over the Pacific Northwest will continue over the area through Tuesday evening. Snow will develop over parts of the Northwest, Northern/Central California, and Great Basin through Tuesdsay evening. Rain will also develop over parts of California. Off shore flow will develop over parts of Washington State and the Northern Intermountain Region that will bring and end to the snow over that area Monday night into Tuesday. A plume of moisture will begin to move into California on Tuesday. The moisture will aid in producing heavy rain and heavy higher elevation snow over parts of California on Tuesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php