Short Range Forecast Discussion NWS Weather Prediction Center College Park MD 311 PM EDT Sat Aug 27 2022 Valid 00Z Sun Aug 28 2022 - 00Z Tue Aug 30 2022 ...Slight risks of excessive rainfall and severe thunderstorms are in effect for parts of the Upper Midwest tonight... ...Localized heavy to excessive rainfall possible across parts of the Southeast/Gulf Coast and the Southwest... ...Warming trend begins for Northwest and Northeast... A low pressure system moving across the mid-section of the country will be the focus for heavy rain and thunderstorms across the Midwest and Mississippi Valley over the next couple of days. Showers and thunderstorms are expected to continue across the Central/Southern Plains into the Mid-to-Upper Mississippi Valley tonight as moist unstable air streams north and interacts with a warm front. Localized flash flooding and severe thunderstorms capable of producing hail and damaging winds are possible over parts of Iowa and southern Minnesota/Wisconsin due to heightened instability and moisture focusing around the aforementioned warm front. Troughing over Florida and diurnal heating will lead to afternoon convection and the threat of heavy rainfall, particularly across west-central portions of the state tonight through Monday. Severe thunderstorms are also possible across portions of north/central Minnesota into northwestern Wisconsin on Sunday where a Slight Risk is in effect. Scattered thunderstorms with the threat of an isolated heavy rainfall event will also be present over the Upper Midwest on Sunday before spreading into the Ohio/Tennessee Valleys on Monday. Diurnal heating will present the Southwest with the chance for scattered to isolated thunderstorms over the next couple of days and a very localized flash flooding threat tonight. A warming trend will ensue in the Northeast over the next few days with highs in the 80s to low 90s across the on Monday and Tuesday before a cold front pushes through and moderates temperatures mid-to-late next week. Upper level ridging and the influence of amplified troughing in the east Pacific will begin warming temperatures in the Pacific Northwest on Monday with highs likely to climb into the 90s and upward heading into midweek. Kebede Graphics are available at https://www.wpc.ncep.noaa.gov/basicwx/basicwx_ndfd.php