After clicking some links, I confirmed that there was also a storm called Daniel and that the two dams didn't just burst by themselves, they burst because of the flood from that storm

PS: apparently it's not just the storm, there were previous warnings.

A 2022 report in an academic journal had warned that if a flood equivalent to one in 1959 was repeated, it would be “likely to cause one of the two dams to collapse, making the residents of the valley and the city of Derna vulnerable due to a high risk of flooding”.

https://www.theguardian.com/world/2023/sep/12/libya-floods-death-toll-dams-burst