Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 411 PM EDT Sun Sep 30 2018 Valid 00Z Mon Oct 01 2018 - 00Z Wed Oct 03 2018 ...Heavy rain for the Desert Southwest due in part to Rosa... ...Heavy rain possible for parts of the Great Lakes and Upper Mississippi Valley... ...Temperatures will be 10 to 15 degrees below average over parts of the Upper Mississippi Valley/Upper Great Lakes... Heavy rainfall is set to make a return to much of Arizona and eastern California by Monday as Hurricane Rosa tracks towards the northeast and reaches the region in a much weaker form in terms of wind. Moisture ahead of Rosa will aid in developing showers and thunderstorms over parts of the Southwest/Great Basin and Central/Southern Rockies overnight Sunday into Monday evening. Overnight Monday the low associated with Rosa will move into the Southwest as showers and thunderstorms continue over the area through Tuesday. See the latest advisory from the National Hurricane Center for the latest on Rosa's track and intensity. Meanwhile, tropical moisture and weak upper-level impulses will aid in producing showers and thunderstorms over parts of the Southwest and the Central/Southern Appalachians westward across the Central/Western Gulf Coast through Tuesday. In addition, a front extending from parts of the Northeast roughly southwestward to the Central High Plains will be quasi-stationary through Tuesday, too. Showers and thunderstorms will develop along and near the boundary from parts of the Northeast to parts of the Central Plains that will end overnight Monday for the Central Plains. The showers and thunderstorms will continue along the boundary from the Middle Mississippi Valley to the Northeast through Tuesday. Additionally, upper-level energy over the Northern Intermountain Region/Northern Rockies will move eastward to Eastern Ontario by Tuesday morning. The energy will aid in producing rain and highest elevation snow over parts of the Northern Rockies into the Northern Plains that will move eastward into the Upper Mississippi Valley/Northern Plains by Monday morning. The rain and snow will change over to all rain by Monday afternoon. The rain will move into the Great Lakes overnight Monday into Tuesday morning. Elsewhere, upper-level energy just off the West Coast of Canada will move southward and merge with an upper-level low off the Northern/Central California Coast overnight Monday into Tuesday. The energy and weak onshore flow will aid in producing rain over parts of the Pacific Northwest through Tuesday. Furthermore, the aforementioned upper-level low and associated front over the Eastern Pacific will aid in producing rain over Northern/Central California overnight Monday that will move inland by Tuesday morning. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php