In the planetary scale, for the Earth at least, typhoons and hurricanes are like Earth's cooling system. All equatorial oceans are very hot, and thus contains a lot of energy and heat. If we think about the major ocean currents, sometimes, for some areas, the heat displaced by the major ocean currents like the Kuroshio and the Gulf Stream, the system is just too slow, that's why there are storms. What storms do is that they suck all of that heat energy out of the oceans and consume them out eventually. That is why every time a storm passes, high pressure areas (good sunny weather) always follows the low pressure system we call typhoons, becomes there's not much energy anymore in the area, on which the heating cycle reoccurs again (that's why Global Warming is very bad for coastal areas, because, more hotter oceans means more energy for typhoons to suck out to stabilize the ocean temperature).
Another thing is that typhoons are giant rain transportation systems. It is because, as the low pressure areas suck out heat, they also manage to grab some water from the oceans. Once they do this, the storm clouds store and spit out some of its rain (well, I mean 10 to 20 inches of rain per hour), WHICH IS A LOT OF WATER.
Hope my answer helps.
