A late season tropical wave moved off the west coast of Africa on October 14, following a wave that had spawned Sebastien.
The wave moved to the west at a slow pace over the next week, with little development until October 24, when an area of cloudiness
associated with the tropical wave merged with a nearby area of convection. This junction of two systems likely caused the
wind shear that would destroy nearby Sebastien. Three days later, the wave had organized enough to become Tropical Depression
Twenty-One, the last of the active season on October 26. The initial movement of the depression was to the northeast, and
this continued as it strengthened quickly into Tropical Storm Tanya on October 27. At this point, Tanya slowed and took a
brief turn to the east, before recurving to the north, and then to the north northwest as it gained hurricane status despite
cool waters and other unfavorable factors. The hurricane turned to the ENE, a motion that would continue for the rest of the
storm’s tropical life at this time. Further intensification of Tanya was very slow, which led to the gradual achievement
of the storm’s peak intensity on Halloween itself (October 31) with winds of 90 mph and a pressure of 972 mbar.
Weakening began after this was reached, and Tanya was downgraded to a tropical storm on November 1 as it moved closer to the
Azores. The remnant became extratropical as it passed over the Azores later that day, and then merged with a larger system
over the north Atlantic on November 3. Despite blustery conditions that probably occurred over the Azores Islands, no reports
of damages were received.