Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 357 PM EDT Sun Jun 10 2018 Valid 00Z Mon Jun 11 2018 - 00Z Wed Jun 13 2018 ...There is a slight risk of severe thunderstorms over parts of the Northern Plains and Western Ohio Valley... ...Heavy rain possible over parts of the Upper Midwest and the Ohio Valley into the Northern Mid-Atlantic... ...Rain/snow possible over the highest elevations of the Cascades and Northern Rockies... A front extending from the Mid-Atlantic westward to the Northern Plains will be quasi-stationary through Monday evening when high pressure over Eastern Canada pushes southeastward to the Northern Mid-Atlantic Coast by Tuesday. The eastern half of the boundary will move southward from the Mid-Atlantic into parts of the Southeast by Tuesday. Showers and thunderstorms will develop along and near the front from the Middle Mississippi Valley eastward to the Mid-Atlantic through Monday night. Overnight Monday the showers and thunderstorms will move south over the Mid-Atlantic into the Southeast by Tuesday morning. The showers and thunderstorms will continue over the Middle Mississippi Valley eastward into the Ohio Valley and the Central/Southern Appalachians through Tuesday. Additionally, moisture from the Gulf of Mexico and upper-level impulses will aid in producing showers and thunderstorms over parts of the Western/Central Gulf Coast and Florida through Tuesday. Meanwhile, onshore flow will stream moisture inland over the Pacific Northwest into parts of the Northern Rockies/Northern High Plains through early Monday morning when the onshore flow ends. A deep upper-level trough will be over the Northwest through Monday evening when weak upper-level ridging builds over the Pacific Northwest. Rain will develop over the Northwest with rain/snow over the highest elevations of the Cascades through Monday evening. In addition, rain and highest elevation rain/snow will develop over parts of the Northern Intermountain Region into the Northern Rockies ending overnight Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php