Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 243 AM EST Sun Jan 28 2018 Valid 12Z Sun Jan 28 2018 - 12Z Tue Jan 30 2018 ...Heavy rain possible over parts of the Pacific Northwest... ...Heavy snow over the Northern Cascades... ...Heavy rain over parts of the Southern Mid-Atlantic Coast... A front along the Eastern Seaboard will slowly move eastward out over the Western Atlantic by Monday evening. Moisture will pool along the boundary aiding in the development of rain from Southern New England southward to the Southeast and the Central Gulf Coast and as far westward as Central Appalachians/Eastern Ohio Valley and the Tennessee Valley that will slowly move off the Northeast Coast by Sunday evening. By Monday evening the rain will be confined to parts of the Northern Mid-Atlantic Coast and Southeastern Florida. In addition, upper-level energy over the Northern High Plains will move southeastward to the Ohio Valley by Monday evening. The energy will produce snow over parts of the Northern Rockies/Northern High Plains that will slowly dissipate on Sunday evening. Overnight Sunday, the energy will produce snow and rain over parts of the Middle Mississippi Valley/Western Ohio Valley that will move eastward to the Lower Great Lakes/Eastern Ohio Valley as light snow and some light rain by Monday evening. Meanwhile, a plume of moisture will stream into the Pacific Northwest on Sunday that will slowly begin to wane by Monday evening. The moisture will aid in producing rain and higher elevation snow over the Pacific Northwest that will become confined to the Olympic Peninsula and parts of the Northern Intermountain Region by Sunday evening. Rain will move southward into the Northwest Oregon Coast by Monday evening. On Monday into Monday evening the rain will be heavy at times. Overnight Sunday into Monday evening, the snow levels will slowly start to lower as upper-level troughing moves into the Northwest. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php