Natural Disasters
Storms
Storms are random weather events that occur on the island. They can range from mild to chaotic. Storms cause severe comfort loss. It's also possible that during storms lightning strikes occur. If hit, a player will die. However, adult Apatosaurus are immune to lightning. Taking 3+ points into the Weather Resistance talent will also make you immune to death by lightning. Lightning strikes will also generate fires in the future. Also, tornadoes can start whirling during a storm. Tornadoes are generated during intense storms. They will pick up all players, with the exception of adult Apatosaurus, and chuck them across the map. Tornadoes will track any player who's not in a cave and they tend to track the largest concentration of players in a single area. During intense storms, growth is boosted and stress from nearby, unfriendly creatures is reduced.
Forest fires
Forest fires are most often started by lightning, but may also spawn without it in the form of drought fire. When a fire is spawned, it will propagate across the terrain, spreading to nearby trees, shrubs, and bushes. The fire will continue burning until it has ceased to find suitable vegetation to propagate to. The larger the fire, the further its reach, so large flames can jump from tree to tree, whereas a small fire may only be able to ignite other plants immediately beside it.
Forest fires contain the power to potentially wipe out entire sections of the map from being habitable for herbivores, sometimes requiring migration to other parts of the map to find green vegetation.
Close proximity to forest fires will sharply reduce comfort through the Stressful Scene debuff. Standing in a forest fire will kill you, as will standing near enough to one for long enough (smoke inhalation, leading to Suffocation).
Rain makes it more difficult for forest fires to spread. Due to this, fires are most likely to propagate aggressively during dry lightning and long periods without rain (droughts).
Floodings
Flooding occurs during storms and occurs due to rain causing the tides to rise dramatically. This allows Aquatic Creatures to have more room to roam. Terrestrial Creatures must seek shelter or they will risk drowning.
Natural disasters that could be coming in the game
Currently, we don't know much and the devs are working on other, more important things. Despite this, we know that forest fires, volcanic eruptions, and others may be coming in the future. Since these are usually pretty hard to code, don't expect them to come too soon.
