National Weather Service forecasts highlight a frontal system driving elevated rain probabilities across the northeastern U.S. on September 26, with PoP values of 70-90% in parts of New York, New Jersey, and Connecticut from enhanced moisture and lift. In contrast, most southern and western regions show under 20% chances amid stable high pressure and mostly sunny conditions. NOAA model consensus emphasizes steering winds and moisture advection as primary variables that could refine boundaries overnight, while climatological norms for late September favor scattered rather than widespread events. Final NWS updates on the morning of the 26th will shape resolution criteria based on measurable precipitation thresholds at specific stations.