Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 256 AM EST Sun Jan 29 2017 Valid 12Z Sun Jan 29 2017 - 12Z Tue Jan 31 2017 ...Heavy snow possible over parts of the Upper Mississippi Valley/Upper Great Lakes... ...Snow possible downwind of the Great Lakes and into parts of the Northern/Central Appalachians... A weak boundary over the Great Lakes will weaken by Monday. The system will produce lake effect/lake enhanced snow over the Great Lakes into parts of Northern New England that will slowly come to an end ahead of the next system by Monday afternoon into evening. In addition, upper-level energy over Middle Mississippi Valley will move eastward to Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php