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Tropical Storm Zeta on January 4, 2006. At that time, Zeta still had sustained winds of around 100 kilometers per hour (63 miles per hour), a steady strength the storm had maintained for several days, with a very slight increase in power.

After the previous record-holding storm season of 1933, which saw 21 named storms, weather forecasters established a convention of using just 21 letters of the alphabet (the last letter being W) to begin the names of Atlantic tropical storms. After Hurricane Wilma in October 2005, forecasters turned to the Greek alphabet. Zeta is the sixth letter of that alphabet, and this is the 27th named storm of 2005. One month after 2005’s record-breaking storm season officially ended, this storm appeared roughly 1,600 kilometers (1,000 miles) to the southwest of the Azores Islands.