Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 434 AM EDT Tue Jun 20 2017 Valid 12Z Tue Jun 20 2017 - 12Z Thu Jun 22 2017 ...Low pressure in the Gulf of Mexico is forecast to become a tropical storm... ...There is a slight risk of severe thunderstorms over parts of the Central High Plains... ...Heavy rain possible over parts of Southern Mid-Atlantic/Southeast... ...Heavy rain possible over parts of the Eastern to Western Gulf Coast... Low pressure over Gulf of Mexico is forecast to become a tropical storm and slowly move northward to the Central/Western Gulf Coast. Showers and thunderstorms will begin to develop along the Eastern/Central Gulf Coast on Tuesday that will slowly move farther inland and expand into parts of the Western Gulf Coast on Wednesday. For the most up to date information on storm track and intensity see the latest advisory from the National Hurricane Center. Meanwhile, a front extending from the Northeast southward to the Southern Mid-Atlantic and westward to parts of the Southern Plains will slowly move off the Northeast/Northern Mid-Atlantic Coast and slowly dissipate on Wednesday. The southern half of the boundary will become quasi-stationary from the Southern Mid-Atlantic to the Lower Mississippi Valley and likewise begin to dissipate by Wednesday evening. Showers and thunderstorms associated with the front will move off of New England by Tuesday evening. In addition, showers and thunderstorms will develop along the boundary from the Southern Mid-Atlantic into parts of the Southeast that will continue through Wednesday evening. Furthermore, upper-level energy over the Northern Plains into the Upper Great Lakes will move eastward to the Canadian Maritimes by Wednesday afternoon. The energy will trigger areas of rain and areas of showers/thunderstorms over the Upper Mississippi Valley to the Lower Great Lakes/Northern Appalachians that will end over the Upper Mississippi Valley/Upper Great Lakes overnight Tuesday. Showers and thunderstorms will continue over parts of the Ohio Valley/Lower Great Lakes into parts of the Northeast through Wednesday evening. Additionally, showers and thunderstorms will develop over parts of the Northern Mid-Atlantic on Wednesday into Wednesday evening. Elsewhere, a front will move onshore over the Pacific Northwest and advance eastward to Northern Plains to parts of the Great Basin by Wednesday evening. The boundary will aid in producing showers and thunderstorms over parts of the Northern High Plains into parts of the Great Basin late Tuesday evening that will move into the Upper Mississippi Valley by Wednesday evening. Upper-level energy over parts of the Central Rockies will aid in producing showers and thunderstorms over parts of the Central/Southern Rockies by Tuesday evening. The showers and thunderstorms will return over parts of the Southern Rockies/Southern High Plains on Wednesday afternoon into evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php