Hurricane Patricia formed on 20 October 2015 in the Eastern Pacific and, in less than 3 days, rapidly intensified from a Tropical Storm to a recordâbreaking hurricane with maximum sustained winds measured around 185 knots. It is almost 15 knots higher than 2013's supertyphoon Haiyan (the previous strongest tropical cyclone (TC) ever observed). This research focuses on analyzing the airâsea enthalpy flux conditions that contributed to Hurricane Patricia's rapid intensification, and comparing them to supertyphoon Haiyan's. Despite a stronger cooling effect, a higher enthalpy flux supply is found during Patricia, in particular due to warmer preâTC sea surface temperature conditions. This resulted in larger temperature and humidity differences at the airâsea interface, contributing to larger airâsea enthalpy heat fluxes available for Patricia's growth (24% more than for Haiyan). In addition, airâsea fluxes simulations were performed for Hurricane Patricia under different climate conditions to assess specifically the impact of local and largeâscale conditions on storm intensification associated with six different phases and types of El Niño Southern Oscillation (ENSO) and longâterm climatological summer condition. We found that the Eastern Pacific El Niño developing and decaying summers, and the Central Pacific El Niño developing summer are the three most favorable ENSO conditions for storm intensification. This still represents a 37% smaller flux supply than in October 2015, suggesting that Patricia extraordinary growth is not achievable under any of these typical ENSO conditions but rather the result of the exceptional environmental conditions associated with the buildup of the strongest El Niño ever recorded.