Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 355 PM EDT Tue Aug 28 2018 Valid 00Z Wed Aug 29 2018 - 00Z Fri Aug 31 2018 ...There is a slight risk of severe thunderstorms from the Middle Mississippi Valley to the Upper Great Lakes... ...Heavy rain possible over parts of the Middle Mississippi Valley... ...An Air Quality Alert due to wildfires remains in effect across Southern Oregon... ...Temperatures will be 10 to 15 degrees above average over parts of the Northeast... A front extending from the Upper Great Lakes southwestward to the Southern High Plains will move eastward to the Northeast Coast southwestward to the Lower Mississippi Valley/Southern Plains by Thursday. Showers and thunderstorms will develop along and near the boundary from the Great Lakes to the Southern High Plains that will move eastward to the Northeast/Ohio Valley into parts of the Lower Mississippi Valley/Southern Plains by Thursday. In addition, tropical moisture extending from the Southeast westward to parts of the Western Gulf Coast and upper-level impulses will trigger showers and thunderstorms over the region through Thursday. Meanwhile, a front will move southeastward from Western Canada to parts of the Northern Rockies southwestward into the Pacific Northwest on Wednesday into Thursday. Weak onshore flow and the boundary will aid in producing rain over parts of the Pacific Northwest Coast beginning on Wednesday and continuing through Thursday. One Air Quality Alert remains in place across Southern Oregon, where an ongoing wildfire continues to burn. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php