The overwhelming 98.3% market-implied probability against hurricane formation by May 31 reflects the current mid-May timing and unfavorable ocean-atmosphere conditions across the Atlantic basin. Sea surface temperatures in the main development region remain below the 26.5°C threshold needed for sustained tropical cyclogenesis, while persistent wind shear and stable atmospheric layering continue to suppress organization. National Hurricane Center monitoring shows no active systems or seed disturbances, consistent with historical records of only rare pre-June formations. Forecasters expect these patterns to hold through the end of the month, though any rapid warming or reduced shear in late May could introduce limited uncertainty.