Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 343 AM EDT Sun Jul 15 2018 Valid 12Z Sun Jul 15 2018 - 12Z Tue Jul 17 2018 ...Heavy rain possible over parts of the Eastern Gulf Coast... A dissipating quasi-stationary front extending from parts of the Northeast/Lower Great Lakes southwestward to the Central High Plains will aid in developing showers and thunderstorms from parts of the Northeast southwestward to the Southern High Plains. The boundary dissipates overnight Sunday. The moisture associated with the front sinks southward into the Mid-Atlantic to the Ohio Valley by Sunday evening remaining through Monday evening. The moisture and daytime heating will aid in producing showers and thunderstorms from the Southern Mid-Atlantic into the Ohio and Tennessee Valleys through Monday night into Tuesday morning. In addition, tropical moisture extending from the Southern Plains to the Southeast along with daytime heating will aid in producing showers and thunderstorms over the region through Monday evening. Meanwhile, a front extending from the Upper Mississippi Valley southwestward to the Central Rockies will move eastward to the Lower Great Lakes/Ohio Valley then westward to the Southern High Plains through Tuesday morning. Showers and thunderstorms will develop along and ahead of the boundary from the Upper Mississippi Valley into the Central Rockies that will move eastward to the Lower Great Lakes/Northern Mid-Atlantic southwestward to the Southern High Plains by Monday evening. Additionally, monsoonal moisture and daytime heating will aid in producing showers and thunderstorms over parts of the Southwest/Great Basin and the Central/Southern Rockies through Monday evening. The greatest areal coverage of the precipitation will be during the late afternoon into the late evening on Sunday and Monday. Elsewhere on Sunday morning, upper-level energy will move onshore over parts of the Pacific Northwest and Northern California moving inland to the Northern Intermountain Region by Monday evening. The energy will trigger scattered showers and thunderstorms over parts of the Pacific Northwest, Northern California, and the Great Basin through Monday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php