Warmer temperatures over the Arctic has slowed the jet stream, which pushes colder weather further south, experts say.
A new database of past weather measurements allows researchers to pinpoint atmospheric conditions anytime during the past 138 years.
A split in the jet stream resulted in northern fires and southern floods last year. But the original cause for the blockage that produced the split remains a mystery.
The frequency of tornadoes this year indicates variability in the northward migration of the summer jet stream.
Three generations of Russian scientists have been keeping track of the world's largest and deepest lake and they're finding some surprising climate change connections.