Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 320 PM EST Wed Feb 15 2017 Valid 00Z Thu Feb 16 2017 - 00Z Sat Feb 18 2017 ...Heavy rain possible over parts of the West Coast... ...Heavy snow possible over the Sierras... ...Heavy snow possible over parts of Northern New England... ...Lake effect snow to end downwind from the Great Lakes... Deepening low pressure off New England Coast will slowly move northeastward into Eastern Canada by Friday. The system will produce snow over parts of the Northeast through Thursday evening. In the wake of the storm, lake effect snow will develop downwind from the Great Lakes ending over the Upper Great Lakes by Thursday afternoon and the Lower Great Lakes overnight Thursday. Rain associated with the system's front will come to an end over Mid-Atlantic/Southeast Coast by Wednesday evening. Meanwhile, a deep upper-level trough will move onshore over the West Coast that will move inland to the Northern Rockies by Friday. A plume of moisture will slowly move southward to Southern California by Thursday evening into Friday. The storm will produce rain over parts of Northern California and the Pacific Northwest on Wednesday evening. As the upper-level trough moves inland, the snow levels lower with snow developing over parts of the Northern Rockies on Thursday. Additionally, snow will develop over the higher elevation of the Sierras and Cascades on Thursday. Also on Thursday, rain will begin to move into Central California and Southern California by Thursday evening. In addition overnight Thursday, rain and higher elevation snow will end over parts of Central California into parts of the Great Basin. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php