Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 410 AM EDT Tue Oct 04 2016 Valid 12Z Tue Oct 04 2016 - 12Z Thu Oct 06 2016 ...There is an enhanced risk of severe thunderstorms over parts of the southern/central Plains... ...Heavy rain possible over parts of the Upper Midwest, Midwest and central Plains... High pressure will build over the Northeast and expand southward along the east side of the Appalachians over the next few days. Isolated to scattered showers will be possible today for portions of the northern Mid-Atlantic as the remnants of a weakened cold front passes through the region. Hurricane Matthew will track closer towards the Southeast and will stall the progression of cold front over the Atlantic. The southern flank of the boundary will be near the Florida coast. This area will likely have increased rainfall later this week as Hurricane Matthew continues to track closer toward the Southeast. A deep upper-level low will move northeastward out of the northern Rockies and deepen over the Northern Plains by Wednesday. The system will produce showers and thunderstorms from parts of the Northern High Plains into the Northern/Central Plains southward into the Southern High Plains, before advancing into the Mississippi Valley by Wednesday. Some of the highest elevations of the northern/central Rockies will likely have snow. Another upper-level low will move southeastward from near the British Columbian coast into the Pacific Northwest - reinforcing the deep upper-level trough over the West Coast. Onshore flow into the Pacific Northwest will result in widespread rain from the coast to the Cascades. Periods of heavy rain may occur, which could increase the threat for flash flooding. The intensity and areal coverage of the rain is forecast to decrease by Wednesday evening. Campbell Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php