Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 304 AM EST Sat Dec 07 2013 Valid 12Z Sat Dec 07 2013 - 12Z Mon Dec 09 2013 ...Freezing rain and sleet possible from parts of the Lower Mississippi Valley to the Central Appalachians/Northern Mid-Atlantic... ...Snow from the Middle Missouri Valley to the Upper Great Lakes and over parts of the Mid-Atlantic... ...Heavy rain possible from the Lower Mississippi Valley to the Tennessee Valley... ...Temperatures will be 10 to 35 degrees below average from the High Plains to Great Lakes/Central Gulf... A storm over the Great Basin will move eastward to the Middle Mississippi Valley and merge with the system over the Southeast by Sunday evening. The system will produce snow over the Great Basin/Central Rockies and the higher elevations of California that will move eastward into the Central Rockies/Middle Missouri Valley by Sunday morning. The snow will wane to a few small areas over parts of the Central Rockies by Sunday evening. Rain will also develop over parts of Central/Southern California through Saturday evening. In the meantime, a front over the Southeast will begin to lift northward over the Central/Eastern Gulf Coast by Sunday evening and merge with the storm from the West. The system will produce showers and thunderstorms over parts of the Southeast/Southern Mid-Atlantic on Saturday. Rain will develop over parts of the Central Gulf Coast on Saturday and will lift northward into the Tennessee Valley/Southern Mid-Atlantic by Sunday. Snow will develop over parts of the Ohio Valley on Sunday morning that will expand into the Upper Great Lakes to the Northern Mid-Atlantic by Sunday evening. A band of freezing rain/sleet will develop over parts of the Tennessee Valley and the Mid-Atlantic on Sunday. Elsewhere, lake effect snow will develop over parts of the Upper Great Lakes through Sunday morning. In addition, high pressure will develop over the Pacific Northwest on Sunday. Another area of high pressure over the Northern Plains will move eastward to Northeast/Southeastern Canada by Sunday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php