Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 415 PM EDT Mon May 14 2018 Valid 00Z Tue May 15 2018 - 00Z Thu May 17 2018 ...There is a slight risk of severe thunderstorms extending in an arc from the Southern Plains to the Middle Mississippi Valley/Western Ohio Valley to the Mid-Atlantic... ...Heavy rain possible along parts of the Eastern Gulf Coast/Southeast... A quasi-stationary front extending from the Southern Plains to Middle Mississippi Valley/Western Ohio Valley to the Northeast/Mid-Atlantic will be the focus for showers and thunderstorms along and near the boundary through Wednesday evening. The eastern portion of a reinforcing front extending from the northern tip of Maine across Southeastern Canada to South-Central Canada will move southeastward into the Northeast and merge with the stationary front by Tuesday evening. The system will aid in producing showers and thunderstorms over parts of the Lower Great Lakes into parts of the Northeast on Tuesday morning into Tuesday evening. The western portion of the boundary will straddle the U. S./Canadian border from the Upper Great Lakes to the Northern High Plains through Wednesday. Meanwhile, a weakening upper-level low over the Great Basin will aid in producing showers and thunderstorms over parts of the Great Basin into the Northern/Central High Plains Through Wednesday. A second upper-level low over the Eastern Pacific will move onshore over California overnight Tuesday into Wednesday. The energy will aid in producing showers and thunderstorms over inland parts of the Pacific Northwest/Northern California Tuesday evening into Wednesday. Another upper-level low over the Northeastern Gulf of Mexico will aid in steering moisture into the Southeast/Mid-Atlantic and the Central Gulf Coast through Wednesday. The moisture and energy will aid in producing showers and thunderstorms over parts of Florida and the Southeast that will expand into the Southern Mid-Atlantic and the Central Gulf Coast by Tuesday afternoon into Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php