Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 257 PM EST Wed Jan 18 2017 Valid 00Z Thu Jan 19 2017 - 00Z Sat Jan 21 2017 ...Heavy snow possible over the Sierras... ...Heavy rain possible over most of the West Coast... ...Heavy rain possible over the Lower Mississippi Valley into the Tennessee Valley... ...Snow possible over parts of Northern New England... Low pressure developing over Eastern Texas/Lower Mississippi Valley will lift northward to the Western Ohio Valley by Friday. The system will produce showers and thunderstorms over parts of the Western Gulf Coast and the Lower Mississippi Valley that will move eastward to parts of the Southeast by Thursday evening into Friday. During the day on Thursday, the showers and thunderstorms will extend as far north as the Western Ohio Valley through late Thursday night. Rain will develop along the boundary over parts of the Middle Mississippi Valley by Thursday morning that will move into parts of the Upper Mississippi Valley, Great Lakes, and Ohio Valley by Friday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php