Recent National Weather Service model runs and ensemble guidance show substantial uncertainty in the position and timing of a cold front approaching the Southeast, creating divergent temperature scenarios for Atlanta on September 29. Strong high pressure could maintain warm, southerly flow with highs exceeding 90 °F, while a faster frontal passage would introduce cooler, drier air and cap readings in the low 70s. Historical late-September variability, combined with ongoing ENSO-neutral conditions and limited lead time before resolution, has produced closely matched market-implied odds near 50 % for the extreme outcomes. Traders are monitoring updated 00Z and 12Z model cycles plus local observations for clearer steering signals.