Tornadoes. A climate view of tornadoes. Possibly the hardest brief yet. There is very little that is certain about climate change and tornadoes. When and where a tornado outbreak in the US occurs is predominantly determined by weather patterns that bring together the warm moist air from the Gulf of Mexico and the cold dry air from the North. Because these weather patterns are very variable from year to year, it is hard to establish any long term effect of climate change.