Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 302 AM EST Mon Jan 20 2020 Valid 12Z Mon Jan 20 2020 - 12Z Wed Jan 22 2020 ...Temperatures will be 10 to 35 degrees below average over the Middle Mississippi Valley and parts of the Plains into the Southeast... ...Rain and higher elevation snow from Northern California/Pacific Northwest to the Rockies... Lake effect snow will begin to wind down by Monday afternoon downwind from the Great Lakes. A cold dome of high pressure over the Northern Plains will move southeastward to the Mid-Atlantic by Wednesday. Temperatures associated with the high will be 10 to 35 degrees below average over the Middle Mississippi Valley and parts of the Plains into the Southeast that will begin to modify on Tuesday into Wednesday. Weak moisture and upper-level energy will aid in producing rain and higher level snow from Northern California/Pacific Northwest to the Rockies though Wednesday. On Tuesday, moisture from the Western Gulf of Mexico will stream northward over the Plains into the Upper Mississippi Valley as energy from the West Coast moves eastward to the Upper/Middle Mississippi Valley by Wednesday. Rain will develop over parts of the Southern High Plains on Tuesday afternoon into evening that will move into the Central Plains overnight Tuesday into Wednesday. Areas of rain/freezing rain may develop over parts of the Middle/Upper Mississippi Valley, likewise, overnight Tuesday into Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php