The storm killed 7 people total, due to flooding from the cyclone,[1] in the countries of Tunisia, Algeria, Malta, and Italy, where the worst of the effects have been felt, especially on the island of Sicily.

[6] On the next day, the low started to develop a low-level circulation center, and moved into the Tyrrhenian Sea.

On 28 October, the system organized even further and intensified, which prompted forecast offices in Europe to name the low.

[8] After Apollo made its closest approach to Sicily during the overnight hours of 29 October, Apollo appeared to have begun to weaken as its convection waned and its low-level circulation became exposed on visible satellite imagery on 30 October 2021.

[9][10] On 31 October 2021, Apollo made landfall near Bayda and stayed inland until emerging over the Mediterranean a few hours later.