High Quality Content by WIKIPEDIA articles! The 1851 Atlantic hurricane season was the first Atlantic hurricane season in the official Atlantic tropical cyclone record. Six known tropical cyclones occurred during the season, the earliest of which formed on June 25 and the latest of which dissipated on October 19. These dates fall within the range of most Atlantic tropical cyclone activity. None of the cyclones existed simultaneously with another. Of the six storms, two only have a single point in their track known.