Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 PM EDT Wed May 09 2018 Valid 00Z Thu May 10 2018 - 00Z Sat May 12 2018 ...There is a slight risk of severe thunderstorms over parts of the Western Ohio Valley/Great Lakes... Upper-level energy over the Upper Upper Great lakes/Upper Mississippi Valley will move eastward to off the Northeast Coast overnight Thursday while another area of upper-level energy over Central Canada will reinforce the associated boundary over the Northeast/Mid-Atlantic Coast by Friday. The system will produce showers and thunderstorms over the Great Lakes/Western Ohio Valley into parts of the Northern Plains that will move eastward to the Northeast/Mid-Atlantic Coast and into parts of the Tennessee/Middle Mississippi Valleys by Thursday evening. Overnight Thursday, the showers and thunderstorms will move off the Northeastern/Mid-Atlantic Coast and ending over the Tennessee Valley. Meanwhile, disorganized upper-level energy over the Northern Intermountain Region/Great Basin will move eastward to the Middle Mississippi Valley by Friday. Onshore flow will aid in producing rain over parts of the Pacific Northwest through Thursday night as the onshore flow will end on Friday. The energy will aid in producing showers and thunderstorm over parts of the Northern Intermountain Region into parts of the Northern/Central Rockies that will move into the parts of the Northern Plains by Thursday morning. The showers and thunderstorms will move to parts of the Middle Mississippi Valley extending westward to parts of the Central High Plains by Thursday evening. By Friday, the showers and thunderstorms will move into the Great Lakes extending westward to parts of the Northern/Central Plains. Additionally, an upper-level trough just off the West Coast will move inland to the Northern Intermountain Region/Southwest by Friday while intensifying. The trough will aid in producing rain with embedded thunderstorms over parts of the Northern Intermountain Region on Thursday afternoon. The region of rain and embedded thunderstorms will expand into parts of the Northern/Central Rockies and parts of the Great Basin by Friday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php