The updated Climate Impact Company 2025 North Atlantic basin tropical cyclone season forecast projects 16 tropical storms, 7 hurricanes, and 3 intense hurricanes. The accumulative cyclone energy (ACE) index forecast is 137. The outlook is slightly less active than the original outlook issued 2 months ago.

The mid-latitude mid-to-late May 2025 upper-level low-pressure troughs, most prominent across the East U.S., are the result of high latitude high pressure blocking (also) causing unusually warm surface temperatures which are accelerating polar ice melt including the Greenland icesheet. The freshwater runoff is creating a stratified cool layer of water at the surface south of Greenland as the North Atlantic warm hole (NAWH) is developing.