Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 314 PM EST Tue Dec 23 2014 Valid 00Z Wed Dec 24 2014 - 00Z Fri Dec 26 2014 ...There is a slight risk of severe thunderstorms along the Central/Eastern Gulf Coast... ...Heavy rain possible from the Southeast/Eastern Gulf Coast northward to the Southern Mid-Atlantic... ...Snow possible for parts of the Great Lakes and the Northern/Central Rockies... Deep storm developing over the Ohio Valley/Great Lakes will move northward into Canada by Thursday morning. Moisture from the Gulf of Mexico will pool along the associated front producing shower and thunderstorms over the Central Gulf Coast/Tennessee Valley and the Southeast that will move off the Southeast Coast later Wednesday evening. Light to Moderate rain will develop over parts of the Ohio Valley/Great Lakes on Wednesday morning that will move to the Mid-Atlantic/Northeast as well as the Great Lakes by Wednesday evening that will move to Northern New England by Thursday morning, Christmas. In addition, snow will develop from the Upper Great Lakes/Upper Mississippi Valley to the Central Plains that will move to the Middle Mississippi Valley by Wednesday morning. The snow will continue over parts of the Upper Great Lakes/Western Ohio Valley on Wednesday evening that will move into Canada by Christmas morning, Thursday. Meanwhile, a front moving onshore over the Pacific Northwest will move inland to the Upper Midwest to the Great Basin and Southern California by Thursday, Christmas. The system will produce moderate to heavy rain over parts of the Pacific Northwest Coast Tuesday evening into Wednesday morning. As the storm moves inland, snow will develop over parts of the Northern Rockies on Wednesday morning, that will expand southward into the Great Basin and increase in intensity to moderate snow. The moderate snow will move into parts of the Central Rockies/Great Basin by Christmas morning. Additionally, light snow will move into parts of the Northern Plains also by Christmas morning, Thursday. Behind the front, weak onshore flow will produce coastal rain and higher elevation snow over parts of the Pacific Northwest Wednesday into Thursday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php