Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 AM EDT Tue Aug 16 2016 Valid 12Z Tue Aug 16 2016 - 12Z Thu Aug 18 2016 ...There is a slight risk of severe thunderstorms over parts of the Northeast... ...Heavy rain possible over parts of the Lower Mississippi Valley and Southern Plains... Low pressure over the Great Lakes will move eastward to off the Northeast Coast by Wednesday evening. The associated boundary extends from parts of the Northeast westward to the Great Lakes then southwestward to the Southern Plains will slowly dissipate over the Lower Mississippi Valley/Southern Plains by Wednesday morning while the northern part of the front moves eastward off the Mid-Atlantic Coast by Wednesday evening. Tropical moisture will pool along the boundary producing showers and thunderstorms along and near the front through Wednesday morning. The showers and thunderstorms will move into the Mid-Atlantic on Wednesday morning into Wednesday evening. Additionally, daytime heating along with very moist air over parts of the Mid-Atlantic/Southeast will aid in producing showers and thunderstorms over parts of the area during the afternoon into late evening hours on Monday and Tuesday. Similarly, daytime heating along with the tropical moisture over the Lower Mississippi Valley and parts of the Southern Plains will produce showers and thunderstorms over the region on Wednesday into Wednesday evening. Meanwhile, tow areas of upper-level energy will move from the Upper Midwest eastward to the Northeast will aid in producing showers and thunderstorms over parts of the Northern Plains/Upper Mississippi Valley that will move eastward to the Northeast Coast by Wednesday morning. The second upper-level energy will move, likewise, from parts of the Northern Plains to the Great Lakes by Wednesday evening. The energy will produce showers and thunderstorm over parts of the Northern Plains overnight Tuesday that will move into parts of the Great Lakes by Wednesday evening. Elsewhere, re-surging monsoonal moisture and daytime heating will aid in producing showers and thunderstorms over parts of the Southern/Central Rockies on Tuesday and Wednesday afternoon into the late evening. Greater areal coverage will develop over that area on Wednesday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php