Enough tropical storms have formed in the Atlantic this year that NOAA has run out of names. For the second time ever. Any further storms will be named using Greek letters.
https://www.theverge.com/2020/9/18/21444296/tropical-storm-wilfred-2020-hurricane-season-greek-names
The last time this happened was 2005. The year of Katrina, Rita and Wilma.