Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 255 PM EST Tue Nov 26 2013 Valid 00Z Wed Nov 27 2013 - 00Z Fri Nov 29 2013 ...Heavy rain possible from the Mid-Atlantic to New England... ...Snow over the Upper Great Lakes and Lower Great Lakes/Northern Appalachians... ...There is a slight risk of severe thunderstorms along the Southeast Coast... ...Temperatures will be 10 to near 25 degrees below average from the Lower Mississippi Valley to the Ohio Valley... A strong storm over the Southeast will advance northeastward to Eastern Canada by Thursday morning, Thanksgiving. The system will pull moisture off the Atlantic, aiding in the development of moderate to heavy rain from the Tennessee Valley to the Mid-Atlantic that will expand northward to New England on Wednesday morning. Showers and thunderstorms will also develop over parts of the Southeast moving into coastal portions of North Carolina by Wednesday morning too. Snow will develop along the northwest edge of the precipitation shield from parts of the Ohio Valley into parts of the Northern Appalachians Tuesday evening. On Wednesday, snow will develop over parts of the Central Appalachians into the Lower Great Lakes. From Tuesday evening into Wednesday morning, a narrow band of rain/freezing rain may develop along the rain/snow transition line over parts of the Northern Appalachians. On Wednesday evening, the storm will begin to wind down with snow over the Lower Great Lakes/Northern Appalachians, dwindling to patches of light snow downwind from the Lower Great Lakes by Thursday morning. The rain will also wind down over Coastal New England Wednesday evening. In addition, lake effect snow will develop over the Upper Great Lakes through Thursday. Elsewhere, a front will develop over parts of the Northern High Plains on Wednesday morning and move eastward to the Upper Midwest by Thursday. The system will produce light snow over parts of the Upper Mississippi Valley/Upper Great Lakes Wednesday afternoon into Thursday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php