Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 400 PM EDT Sun Aug 29 2021 Valid 00Z Mon Aug 30 2021 - 00Z Wed Sep 01 2021 ...Category-4 Hurricane Ida ravaging southeastern Louisiana before weakening and turning north and northeast across the lower Mississippi Valley and into the Tennessee Valleys... ...Heavy rain and initially hurricane-force wind gusts expected to spread across Mississippi toward the Tennessee Valleys during the next couple of days... ...Slight risk of severe thunderstorms over the Great Lakes into tonight, then across the northern Plains on Monday... ...Excessive heat over parts of southern California and the Desert Southwest into Monday; then watching moisture from Tropical Storm Nora begins to arrive on Tuesday... Hurricane Ida rapidly intensified into a category-4 hurricane early this morning before making landfall near Port Fourchon, Louisiana around midday today with 150-mph sustained winds. Weakening ensures as Ida is forecast to move further inland across southeastern Louisiana into this evening. Ida possesses a relatively large circulation with multiple intense rainbands around its circulation. Widespread hurricane-force wind gusts appear likely to spread further inland tonight together with extended periods of heavy rain. The high wind gusts could spread into Mississippi on Monday as Ida is forecast to turn north-northeastward. Additionally, the SPC has issued a Slight Risk of severe weather for tornado potential associated with IDA. Ida will slowly start to weaken after landfall while moving northward into the Tennessee Valley by Tuesday. The excessive rainfall threat will be Moderate over parts of the Lower Mississippi and Tennessee Valleys through Tuesday evening into Wednesday. The severe weather threat will continue for tornado potential associated with IDA through Tuesday morning. Meanwhile, a front over the Upper Great Lakes into the Central Rockies will move eastward, moving off the Northeast Coast and extending across the Ohio/Middle Mississippi Valleys into the Northern High Plains by Tuesday. Showers and thunderstorms will develop along and ahead of the boundary from the Great Lakes into the Northeast by Monday. As a result, the SPC has issued a Slight Risk of severe thunderstorms over parts of the Upper Great Lakes through Monday morning. The hazards associated with these thunderstorms are frequent lightning, severe thunderstorm wind gusts, hail, and a few tornadoes. The severe thunderstorm threat will weaken slightly over the Northeast on Monday into Tuesday morning. Showers and thunderstorms will continue along and near the front from parts of the Northern/Central Plains into the Ohio/Middle Mississippi Valley on Monday into Tuesday. As a result, there will be a Slight Risk of excessive rainfall over parts of the Middle Missouri Valley on Monday into Tuesday. Elsewhere, upper-level impulses and diurnal heating will produce showers and thunderstorms over parts of the Southwest into the Southern Plains from the late afternoon into the late evening on Sunday and Monday. Additionally, heat will also produce hazards. Therefore, Excessive Heat Warnings are in effect over Southern California into parts of the Southwest through Monday. Kong/Ziegenfelder Graphics available at www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php