Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 349 PM EDT Sat Jun 25 2016 Valid 00Z Sun Jun 26 2016 - 00Z Tue Jun 28 2016 ...Strong thunderstorms are possible out ahead of a cold front moving across the North Central to Eastern United States... ...Hotter temperatures are expected to return to the West on Sunday into Monday... ...A cooling trend is on the horizon for Monday into Tuesday as High Pressure builds across southern Canada into the Northern Plains... As a strong early summer storm system moves across Canada's southern provinces, its associated cold front will bring locally heavy showers and thunderstorms and possible severe weather as it moves from the Mississippi Valley across the Midwest late on Saturday and into Sunday. Scattered thundershowers will also occur on Saturday along a weakening frontal boundary separating a high pressure system moving off the East Coast from hotter, more humid air across the Southern Plains and Lower Mississippi Valley. These showers will affect the mid Mississippi Valley into the Tennessee Valley and Southeast. The storm system moving eastward across Canada will be associated with a return to a building upper ridge in the West and an amplifying trough in the East. This will lead to hotter temperatures across the Western states and the start of a cooldown from the Northern Plains across the Midwest. The cooler temperatures will really start to move into the Upper Mississippi Valley and Midwest later Monday into Tuesday. Additional showers and thundershowers that will pulse during the afternoon and evenings are likely across the central and southern Rockies into the Central Plains on Saturday into Sunday. While scattered thundershowers will also occur in the heat and humidity especially across Texas and Florida later Saturday, the area affected by these scattered storms will expand on Sunday covering much of the Southern Plains into the Southeast US. By Monday as the cooler air begins to move southeastward across the Plains and Midwest, showers and thunderstorms will become more numerous out ahead of the lead cold front especially over the southern Ohio Valley into the Tennessee Valley, the Southeast and along the central Appalachians by later Monday. The showers and storms will move toward the Middle Atlantic states by Monday night and early Tuesday. Kocin Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_wbg.php