Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 358 PM EDT Sat Sep 29 2018 Valid 00Z Sun Sep 30 2018 - 00Z Tue Oct 02 2018 ...Hurricane Rosa in the Eastern Pacific is expected to become a heavy rain threat to the Desert Southwest by Monday... ...Heavy rain possible over parts the Upper/Middle Mississippi Valley into the Upper Great Lakes... ...Temperatures will be 10 to 20 degrees below average over parts of the Northern/Central Plains into the Great Lakes... ...Snow possible over the highest elevation of the Northern Rockies and Northern Plains... Hurricane Rosa, currently in the Eastern Pacific is forecast to make landfall into Baja California by overnight Monday. The system is forecast to become a heavy rain producer for the Desert Southwest by early next week. Check the latest advisory from the National Hurricane Center for the track and intensity of Rosa. Moisture associated with Rosa will move inland over parts of the Southwest overnight Sunday aiding in the development of showers and thunderstorms from Sunday evening into Monday over parts of the Southwest. Tropical moisture over the Western Gulf Coast to the Southeast and an old boundary will aid in producing showers and thunderstorms over the region through Monday. The greatest areal coverage will be during the afternoon into the evening hours. Meanwhile, a front extending from the Central High Plains eastward to the Middle Mississippi Valley will lift northward into the Ohio Valley eastward into the Northern Mid-Atlantic by Monday. Rain with embedded thunderstorms will develop over parts of the Central Plains/Middle Mississippi Valley that will expand eastward into the Great Lakes/Ohio Valley on Sunday into Monday. Along the western end of the boundary, rain and highest elevation snow will develop over parts of the Northern Rockies/Northern High Plains that will slowly lift northward into Canada by Monday morning. In addition, upper-level energy will move inland over parts of Northern California/Pacific Northwest that will move eastward to Central Plains by Monday. The energy and weak onshore flow will aid in producing rain over parts of Northern California and the Pacific Northwest through Monday. As the energy moves out of the Rockies, rain and snow will develop over parts of the Northern Plains overnight Sunday before moving into Canada by Monday. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php