Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 404 PM EDT Sat Jun 09 2018 Valid 00Z Sun Jun 10 2018 - 00Z Tue Jun 12 2018 ...There is a slight risk of severe thunderstorms over parts of the Northern Rockies/Northern High Plains and over parts of the Upper/Middle Mississippi Valley... ...Heavy rain possible over parts of the Middle/Upper Mississippi and Ohio Valleys and parts of the Mid-Atlantic... ...Rain/snow possible over the highest elevations of the Cascades and Northern Rockies... A quasi-stationary front will extend from Mid-Atlantic westward to Middle Mississippi Valley through Monday. Showers and thunderstorms will develop along and near the boundary from the Middle Mississippi Valleys eastward into parts of the Mid-Atlantic also through Monday. In addition, an upper-level low over parts of the Lower Mississippi Valley will, likewise, remain quasi-stationary over the region through Monday as moisture flows northward out of the Western Gulf of Mexico. The moisture, daytime heating, and upper-level energy will aid in producing showers and thunderstorms over the Western/Central Gulf Coast and Lower Mississippi Valley through Monday. Similarly, upper-level energy over Florida and tropical moisture will aid in producing showers and thunderstorms over the Southeast from Saturday into Monday morning. Meanwhile, a front extending from Northern High Plains into the Great Basin will move eastward to the Northern/Central Plains into the Southern Rockies/Southwest by Monday. Rain with embedded thunderstorms will develop over parts of the Northern Rockies/Northern Intermountain Region will move slightly eastward by Sunday morning. The systems associated upper-level trough will move eastward over the Northern Rockies as the snow levels lower, rain and snow will develop over the highest elevations of the Northern Rockies through Monday, too. As the front moves onto the Northern Plains, showers and thunderstorms will develop over the area late Sunday afternoon into evening with the showers and thunderstorms expanding into parts of the Upper/Middle Mississippi Valleys overnight Sunday into Monday. Additionally, onshore flow over the Pacific Northwest and parts of Northern California will aid in producing rain and highest elevation rain/snow over parts of the Cascades that will become more scattered by Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php