Current National Weather Service and NOAA model guidance indicates scattered afternoon thunderstorms and showers are most likely across parts of the Southeast, particularly Florida and the Gulf Coast, on September 4 due to persistent tropical moisture, a lingering upper-level trough off the East Coast, and typical sea-breeze convergence. Probabilities range from 50-80% in these areas with localized heavy rainfall possible, while the Northeast and much of the Midwest show lower chances under partly cloudy to mostly sunny conditions. Early September climatology features frequent convective activity in the South driven by high humidity and instability, with official updates from NWS local offices and refreshed model runs expected throughout the day to refine timing and coverage ahead of market resolution.