National Weather Service forecasts indicate scattered showers and thunderstorms are most likely across parts of Florida and the Southeast on September 29, driven by a mid-level shortwave impulse advecting Gulf moisture with precipitable water values rising toward 1.8–2.0 inches. PoP values reach 40–60% in South Florida and similar zones, while the Northeast, Mid-Atlantic, and much of the central U.S. show low probabilities under 10–20% amid drier air masses and subsidence. High-resolution models highlight afternoon convective potential tied to sea-breeze and diurnal heating, with resolution depending on official station measurements of measurable precipitation. Updated short-range guidance from NOAA offices will refine timing and coverage ahead of the 24-hour period.