Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 359 AM EDT Sat Oct 13 2018 Valid 12Z Sat Oct 13 2018 - 12Z Mon Oct 15 2018 ...there is a slight risk of severe thunderstorms over parts of the Southern Plains... ...Heavy rain possible over parts of the Southern Plains/Lower Mississippi Valley into parts of the Tennessee Valley... ...Heavy snows possible from the Northern to Southern Rockies into the Central to Southern High Plains... ...Temperatures will be 20 to 30 degrees below average over parts of the Plains into parts of the Northern/Central Rockies... The upper/middle-level energy once associated with Sergio will race quickly northeastward off the Northern Mid-Atlantic/Southern New England Coast by Sunday afternoon. Moisture from the Western Gulf of Mexico will flow northward over parts of the Southern Plains into the Lower Mississippi Valley/Tennessee Valley by Sunday evening. Showers and thunderstorms will develop over the southern two thirds of Texas that will move into parts of the Lower Mississippi Valley overnight Saturday and into the Tennessee Valley by Sunday evening. In addition, rain will develop over parts of the Southern High Plains into the Texas panhandle that will move into parts of Oklahoma/Lower Mississippi Valley by Saturday evening. The rain will move into parts of the Ohio/Tennessee Valleys by Sunday morning and into parts of the Central Appalachians by Sunday evening. Meanwhile, an upper-level low over Southern California/Northwestern Mexico will move eastward to the Southern Rockies by Sunday morning and interact with additional upper-level energy moving southeastward from the Northern Intermountain Region. The energy will aid in producing rain with embedded thunderstorms over parts of Southern California and the Southwest that will move into parts of the Southern Rockies on Sunday. On Sunday as the energy moves into the Southern Rockies, showers and thunderstorms will begin to develop over parts of the Southern Plains Sunday afternoon into Monday. The aforementioned upper-level energy over the Northern Intermountain Region will move southeastward into the Great Basin/Central Rockies by Sunday evening. The energy will aid in producing snow over parts of the Northern Rockies/Northern High Plains that will move southeastward into the Central Rockies/Central High Plains overnight Saturday that will expand northeastward over the Central Plains and southward into parts of the Southern Rockies/Southern High Plains by Sunday evening. A front and associated upper-level energy will move south and eastward to the Great Lakes/Western Ohio Valley into the Lower Mississippi Valley/Southern Plains by Sunday evening into Monday. The system will produce rain and snow over parts of the Upper Mississippi Valley/Northern Plains. The snow will wane over parts of the Upper Midwest overnight Saturday as rain develops along the boundary over parts of the Upper Great Lakes/Upper Mississippi Valley and into parts of the Middle Mississippi Valley/Central Plains by Sunday morning. The rain will move into parts of the Great Lakes/Middle Mississippi Valley/Southern Plains by Sunday evening. Elsewhere, upper-level energy over the Eastern Ohio Valley/Northern Mid-Atlantic will move eastward of the Northeast Coast by Saturday evening. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php