National Weather Service guidance and ensemble models currently favor a high near 86–88°F in Atlanta on May 17 under a strengthening upper-level ridge that promotes subsidence, limited cloud cover, and maximum solar insolation. This positions the 86-87°F and 88-89°F outcomes as closely matched leaders, reflecting minor differences in how afternoon convection or slight moisture intrusions might cap the daily maximum. Historical May climatology shows typical highs around 85°F, providing context for the current warm anomaly driven by persistent high pressure. Traders are monitoring the next model runs for any shifts in boundary-layer mixing or timing of potential scattered thunderstorms that could alter the peak temperature by a degree or two before resolution.