Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 327 PM EST Wed Nov 22 2017 Valid 00Z Thu Nov 23 2017 - 00Z Sat Nov 25 2017 ...Heavy rain possible over the Pacific Northwest... ...Heavy rain possible over northern Florida peninsula... A wave of low pressure along a front over the Eastern Gulf of Mexico will move northeastward across the Florida peninsula overnight Thursday (Thanksgiving) into the Western Atlantic well off the Southern Carolina/Georgia Coast by Friday. Moisture will pool along the boundary aiding in the development of showers and thunderstorms over the Florida peninsula overnight Wednesday into Friday morning. Rain will be heavy at times. Meanwhile, a front just off the Pacific Northwest Coast will move inland on Thanksgiving continuing to move eastward to Upper Mississippi Valley/Northern Plains westward into the Central High Plains/Northern Rockies by Friday. A plume of moisture along the Northwest Coast will move southward to Central California by Friday. Rain will develop along the Pacific Northwest Coast and parts of the Northern California Coast that will extend inland to parts of the Northern Rockies Wednesday evening into Thursday. Overnight Wednesday the snow levels will start to lower as the front moves by. Rain and highest elevation snow will develop over parts the Northern Intermountain Region into the Northern High Plains overnight Thursday into Friday. Rain will continue over Northern California into Oregon Thursday into Friday morning. Additionally, onshore flow over the Pacific Northwest will produce rain over the Washington State Coast and snow developing over parts of the Cascades Thursday into Friday. In addition, an area of low pressure over the Northern Plains will move eastward to the southwestern Wisconsin and dissipate by Thursday morning, Thanksgiving. An area of light snow will develop over the parts of the Upper Mississippi Valley on Wednesday evening, dissipating by Thursday morning, Thanksgiving. Furthermore, an area of low pressure east of the Gulf of Maine will move northward into Southeastern Canada by Thursday morning. The low will aid in developing rain and snow over parts of New England ending by Thursday morning, Thanksgiving. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php