Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 407 PM EDT Tue Apr 15 2014 Valid 00Z Wed Apr 16 2014 - 00Z Fri Apr 18 2014 ...There is a slight risk of severe thunderstorms over parts of Florida... ...Heavy snow over parts of the Upper Great Lakes... ...Temperatures will be 10 to 20 degrees below average over the Northern Plains... A front over the Northern High Plains/Great Basin will move eastward to the Upper Great Lakes to the Southern High Plains by Thursday. The system will produce snow and lower elevation rain over parts of the Northern Rockies/Northern High Plains on Tuesday evening. Moderate snow will develop over parts of the Upper Mississippi Valley moving into the Upper Great Lakes Wednesday morning into Thursday morning. Snow will linger over the Northern High Plains through Wednesday night. In addition, rain will develop over parts of the Northern Plains, also moving into parts of the Upper Great Lakes by Thursday. Additionally, upper-level energy over the Central Rockies will move to the Southern High Plains by Thursday. The energy will produce snow and lower elevation rain over parts of the Central Rockies on Wednesday. Moisture from the Gulf of Mexico will move northward over the Southern Plains overrunning the boundary with the aid of the upper-level energy will produce rain over parts of the Southern/Central Plains into parts of the Middle Mississippi Valley on Thursday morning. Meanwhile, a front along the East Coast will move eastward out over the Western Atlantic by Wednesday morning. The system will produce showers and thunderstorms over the Southeast through Tuesday night. Moderate to heavy rain will develop along the boundary from Maine to the Mid-Atlantic, moving off shore by into Wednesday morning. On the northwest edge of the precipitation shield will change over to snow over parts of Central/Northern Appalachians moving to Northern New England Coast Tuesday evening into Wednesday morning. Elsewhere, onshore flow from the Pacific will aid in producing coastal rain and snow over the highest elevations of the Pacific Northwest through Thursday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php