Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 325 AM EDT Sun Sep 09 2018 Valid 12Z Sun Sep 09 2018 - 12Z Tue Sep 11 2018 ...Heavy rain possible from parts of the Ohio Valley into parts of the Northeast... ...Heavy rain possible over parts of the Western Gulf Coast... A front extending from the Mid-Atlantic to the Ohio Valley then southwestward to the Western Gulf Coast will lift slowly northward to the Northern Mid-Atlantic/Lower Great Lakes and southward to the Central/Southern Appalachians southwesterly to the Western Gulf Coast by Monday evening. Rain, heavy at times, will develop over parts of the Ohio Valley into parts of the Lower Great Lakes/Northern Mid-Atlantic that will move out of the Ohio Valley by Monday morning, while the rain moves into parts of the Northeast by Monday evening into Tuesday. In addition, showers and thunderstorms will develop along and near the boundary from parts of the Southern Ohio/Tennessee Valleys southwestward into the Western Gulf Coast that will move eastward to parts of the Northern Mid-Atlantic southward to Southeast/Eastern Gulf Coast then westward into the Western Gulf Coast, likewise, by Monday evening into Tuesday. Furthermore, tropical moisture over the Southeast/Southern Mid-Atlantic will aid in triggering showers and thunderstorms over the region through Monday evening. Meanwhile, a front extending from the Northern Plains to parts of the Great Basin will move eastward to the Upper Mississippi Valley by Monday morning while linking up with a new front moving onshore over Pacific Northwest on Monday. Showers and thunderstorms will develop along the boundary over parts of the Northern Plains that will move eastward to the Upper Mississippi Valley by Monday. The second front will move onshore over the Pacific Northwest on Sunday evening that will move eastward to the Northern High Plains southwestward into the Great Basin/Northern California by Monday evening. A head of the front, weak onshore flow will aid in producing rain over parts of the Pacific Northwest that will slowly move inland into parts of the Northern Rockies by Monday evening. Additionally, upper-level energy over parts of the Great Basin/Central Rockies will move southeastward to the Southern High Plains by Monday evening. The energy will aid in producing showers and thunderstorms over parts of the Great Basin/Central Rockies that will, likewise, move southeastward to the Southern High Plains by Monday evening, too. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php