The heavy rainfall poses a significant risk of flash flooding, particularly in low-lying areas and near rivers such as the St. Johns River in northern Florida, which is highly susceptible to tidal changes. Coastal cities like Jacksonville, Savannah, and Charleston are also at risk of coastal flooding and strong wind gusts of 35-40 mph. Beach erosion and life-threatening rip currents are additional concerns along the Southeast shoreline. Some cities may exceed their average October rainfall totals within just one week, exacerbating the flood threat.