I found it strange that after hours of playing missions in Classic mode, I didn't see or receive any disaster alerts. Not even tsunamis, which were quite common. After completely reinstalling the game, I created new games in classic and custom (addon was on time 15), and noticed that the disaster events still didn't happen. I created other games to check, changed the addon to time 1 and even so, despite seeing a notification of meteors with an evacuation mission far away on the map and a hurricane at the end of my field of vision, for an hour, nothing threatening or tsunamis reached my position.