I mean, there has been a stupid amount of snow and rain in the midwest, so I'm just going to throw this one out there. Let's assume, after all, that there really is a big undercover war going on in the world between the spy agencies of those in power. Let's assume these elite agencies have at their disposal advanced tech of which most of us are unaware...stuff that would make us think "aliens" if we were to actually see it in action.

So to prevent us from seeing it, they use weather-modification to create clouds to prevent their advanced-tech ships from being seen while they fly around.

Clouds create rain.

Midwest floods.