Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 345 PM EDT Tue Apr 26 2016 Valid 00Z Wed Apr 27 2016 - 00Z Fri Apr 29 2016 ...Slight risk of severe weather for the Middle Mississippi and northern Mid Atlantic... ..Moderate risk of severe thunderstorms over parts of the Central/Southern Plains... ...Heavy rain and flash flooding possible for parts of the Southern/Central Plains to mid Mississippi Valley... A classic severe weather pattern is coming together for the central and southern Plains. Strong upper level dynamics will interact with a surface air mass primed for convection leading to the development of potentially widespread strong to severe thunderstorms. These thunderstorms will be in a moisture rich environment and could produce locally heavy rainfall and flash flooding. Please see the excessive rainfall product for more details. Further east, portions of the Mid Atlantic are also at risk for severe weather. While a hot and humid air mass is in place, the upper level dynamics are not as robust and thus the severe weather threat should remain rather isolated. As we move into Wednesday much of the heavy rainfall will shift to portions of the central Plains. The severe weather threat will shift eastward including much of the lower and mid Mississippi Valley. Meanwhile, an upper-level trough over the Eastern Pacific will move to the West Coast by Wednesday evening. The system will produce rain along the Pacific Northwest and Northern California Coast by early Wednesday morning that will move inland to parts of the Northern/Central Rockies by Wednesday afternoon producing snow at the higher elevations of the Northern/Central Rockies and Great Basin. The rain and higher elevation snow will continue from parts of the Northwest to Northern/Central California eastward to the Northern/Central Rockies through Wednesday evening. Krekeler/Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php