Key keywords: severe Tuesday storm, heavy rain forecast, National Weather Service alert, thunderstorm warning, flash flood risk, precipitation ramp up, severe weather preparedness The National Weather Service (NWS) issued a formal preliminary weather advisory on Monday, warning that a fast-moving cold front sweeping across the U.S. Central Plains will collide with warm, moisture-laden air masses from the Gulf of Mexico starting late Tuesday afternoon, driving a sharp spike in rain chances and a high risk of severe, potentially life-threatening storms across 12 states stretching from eastern Oklahoma to western North Carolina. Meteorologists confirm that the most intense storm activity is projected to occur between 6 p.m. and 11 p.m. local time Tuesday, when rotating supercell thunderstorms are likely to form across wide swathes of Arkansas, Mississippi, Alabama, and Tennessee. These storms carry elevated risks of 2-inch diameter hail, straight-line wind gusts exceeding 70 miles per hour, and isolated EF-1 to EF-2 tornadoes, particularly in low-lying coastal counties and river valley regions. Forecast models indicate that total accumulated precipitation will reach 3 to 5 inches across most affected areas over a 12-hour window, with isolated pockets of hilly terrain expected to see up to 7 inches of rainfall. This heavy, short-duration rainfall comes on the heels of two weeks of above-average precipitation across the region, leaving soil saturated and drainage systems already at near capacity, pushing flash flood risk to level 3 out of 4 on the NWS risk scale. Local emergency management agencies across all at-risk states have activated 24/7 monitoring operations as of Monday evening, and are advising residents to monitor official weather updates through NWS radio, local government social media channels, and certified weather apps over the next 36 hours. Residents are urged to prepare household emergency kits containing at least 3 days of non-perishable food, 1 gallon of water per person per day, working flashlights, extra batteries, a first-aid kit, and copies of important personal documents before Tuesday afternoon. For residents living in flood-prone zones or manufactured home communities, officials strongly recommend identifying the nearest designated evacuation shelter in advance, clearing gutters and exterior drainage lines around properties to reduce water buildup, and moving valuable furniture and personal items to upper floors if possible. The NWS is scheduled to release updated severe weather watch and warning notifications by 1 p.m. local time Tuesday, with tornado watches expected to be activated for at least 40 counties across the mid-South region as early as 3 p.m. Tuesday. Meteorologists add that this storm system is part of a prolonged La Niña-driven weather pattern that has brought repeated rounds of severe spring weather to the Southeast over the past month, with above-normal rain chances expected to persist through the end of April.