“We can’t say that these are extremes are because of climate change but we can say that this kind of pattern is becoming more likely because of climate change,” Francis said.

NASA analysis has also drawn a link between the jet stream, climate change and colder temperatures.

A 2010 NASA analysis tied colder temperatures over the course of 2009 to an event similar to the wavy jet stream, called “Arctic oscillation” — a see-sawing pressure system over the North Pole. That oscillation pushed cold air to teh south.

The NASA analysis also said that despite cold snaps, and other weather changes being a part of naturally occurring patterns, they are still in line with a “globally warming world.”

According to Francis, big fluctuations in the jet stream cause extreme weather conditions to hang around longer.