A cooler, drier airmass advected by northerly flow behind an offshore low has set up clear skies and light winds over Atlanta, favoring strong radiative cooling overnight into September 26. Official National Weather Service guidance and ensemble consensus point to a minimum in the mid-50s, with dewpoints dropping into the 50s and minimal cloud cover enhancing heat loss. Market-implied odds cluster tightly around 58-59°F and the 49°F-or-below bucket, reflecting residual uncertainty in boundary-layer moisture and exact wind speeds that could shift the low by a few degrees. Updated model runs and the final NWS point forecast before sunset tonight will provide the clearest signals for resolution.