Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 409 AM EDT Tue Aug 15 2017 Valid 12Z Tue Aug 15 2017 - 12Z Thu Aug 17 2017 ...There is a slight risk of severe thunderstorms over parts of the Central Plains... ...Heavy rain possible from parts of the Upper Great Lakes/Upper Mississippi Valley to parts of the Central Plains... A front extending from the Great Lakes roughly westward to the Central Plains will advance eastward off the Northeast/Northern Mid-Atlantic Coast by Wednesday. The western end of the boundary will extend from Southern Mid-Atlantic roughly westward to Upper Mississippi Valley by Wednesday evening. Showers and thunderstorms will develop along and ahead of the front from the Great Lakes to parts of the Central Plains that will move eastward to the Northeast and extending westward across the Ohio Valley/Middle Mississippi Valley by Tuesday evening. Overnight Tuesday, the showers and thunderstorms will taper off along the boundary redeveloping over the Ohio and Middle Mississippi Valley on Wednesday into Wednesday evening. Meanwhile, upper-level energy extending from the Mid-Atlantic to parts of the Middle Mississippi Valley will move off the Mid-Atlantic Coast overnight Tuesday. The energy will aid in triggering showers and thunderstorms over parts of Southern New England/Mid-Atlantic to parts of the Lower Mississippi Valley that will likewise move off the Mid-Atlantic Coast overnight Tuesday. Additionally, a wave of low pressure over the Central High Plains will advance northeastward to parts of the Upper/Middle Mississippi Valley by Wednesday evening. The system will produce showers and thunderstorms over parts of the Northern Plains into parts of the Central Rockies/Great Basin that will move eastward to the Upper Great Lakes/Upper Mississippi Valley and the Central/Southern Plains/Middle Mississippi Valley by Wednesday evening. Elsewhere, moisture rich air over the Gulf Coast States/Southeast and daytime heating will aid in producing showers and thunderstorms over the region during the late afternoon into late evening hours on Tuesday and Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php