And not to set off a political debate, but this is actually what Al Gore was saying global warming would do: very unstable weather patterns. Global warming could also end up triggering an ice age; if enough ice from greenland melts off it will mess up the trans-atlantic current, which brings heat from the tropics up north. Once that current goes away, the ice creeps in from the north and the whole thing snowballs.
Again, this is just my understanding of climate change issues, I am not saying man-made global warming is or isn't real
