Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 504 PM EDT Sat Oct 10 2020 Valid 00Z Sun Oct 11 2020 - 00Z Tue Oct 13 2020 ...Post-T.C. Delta to track northeastward across Lower Mississippi/Tennessee Valleys into the Ohio Valley with destructive winds and dangerous flooding... ...There is a Slight Risk of Severe Thunderstorms and excessive rainfall over parts of the Lower Mississippi/Tennessee Valleys, Southeast, and parts of the Southern Appalachians, in addition there is a slight Risk of severe thunderstorms over Northern New England into the Lower Great Lakes... ...Rain and high-elevation snow for the Pacific Northwest to the Northern Rockies... ...Temperatures will be 10 to 20 degrees above average over the Plains and parts of the Mississippi Valley... Post-T.C. Delta is forecast to continue to weaken while moving across the Lower Mississippi/Tennessee Valleys. As an extra tropical cyclone, Delta will move into the Ohio Valley on Monday morning. Heavy rain and scattered thunderstorms will lead to the potential for flash flooding across the Lower Mississippi/Tennessee Valleys and Southern Appalachians today. Rainfall totals between 1 and 3 inches are likely for much of that area. The WPC has issued a Slight Risk excessive rainfall over parts of the Lower Mississippi/Tennessee Valleys, Southeast, and parts of the Southern Appalachians through Sunday morning. The heavy rain associated with Delta will produce mainly localized areas of scattered flash flooding with urban areas, roads, and small streams being the most vulnerable. Isolated areas of significant flash flooding are possible. The SPC has also issued a slight risk of severe thunderstorms associated with Delta. The main hazards will be frequent lightning, tornadoes, and severe thunderstorm wind gust mainly over areas of the Southeast through Sunday morning. Furthermore, some upslope enhancement along the Central/Southern Appalachians may contribute to higher rain totals for that region through Sunday. Meanwhile, a front over the Lower Great Lakes and Northern New England will produce showers and thunderstorms on Saturday evening into Sunday morning. The SPC has also issued a Slight Risk of severe thunderstorms over Northern New England into the Lower Great Lakes also though Sunday morning. The main hazards will be frequent lightning, tornadoes, severe thunderstorm wind gust, and hail mainly over areas of the Lower Great Lakes and Northern New England. In addition, an active pattern out west will include heavy rain and high elevation snow for the Pacific Northwest and Northern Rockies through Monday. A pair of low pressure systems are expected to produce 2-4 inches of rainfall across the Pacific Northwest while measurable snow may fall over the higher elevations. The primary system will move eastward and continue to put rain and snow across the Northern Rockies through Sunday. As the upper-level trough that powers this system deepens it will generate rain and scattered to isolated thunderstorms for the Upper Midwest overnight Sunday into Monday. A warm front will develop and strengthen as the upper-level trough deepens over the Great Plains this weekend. Temperatures across the area could see highs up to 20 degrees above average during this period. Many places across Texas, New Mexico and Oklahoma are forecast to break high temperature records this weekend as a result. Additionally, Red Flag Warnings are up across much of the High Plains into the Rockies and Great Basin. Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php