Weather

USA Today reporter Dinah Voyles Pulver spotlights Research Scientist Judah Cohen’s research studying how weather systems and climate patterns are related to the increase in Arctic blasts and deep freezes this winter. 

Research Scientist Judah Cohen speaks with New York Times reporter Eric Niiler about his research studying “how global warming might also be causing colder winters in the eastern United States.” Cohen says “It’s weird what’s going on now in the stratosphere. These stretching events happen every winter, but just how the pattern is stuck is really remarkable.” 

Research Scientist Judah Cohen speaks with Boston Globe reporter Ken Mahan about how a disrupted polar vortex (PV) could impact weather in the United States in the coming weeks. “The PV has been doing its best Mr. Fantastic impression, stretching and compressing continuously,” allowing frigid air to escape southward, Cohen explains. “If we (New England) do receive colder weather, but not quite the cold we experienced in late January, again from this larger PV disruption, it will be either late February and early March.”  

Research Scientist Judah Cohen speaks with USA Today reporter Doyle Rice about how the polar vortex and cold Siberian air could impact weather across the U.S. in February. Cohen noted that some of the cold weather being felt on the East Coast of the U.S. is "coming from Siberia and that is contributing to the extremity of the cold since Siberia is the source of the coldest air of the Northern Hemisphere in winter.”

Postdoctoral Associate Fatima Husain speaks with National Geographic reporter Theo Nicitopoulos about the various theories used to explain how living creature survived the Cryogenian era. “These surface settings could have enabled a diverse assemblage of life to persist and continue to evolve throughout the glaciations,” says Husain. “We keep learning more about how extreme the Cryogenian was… and that makes life persisting and diversifying dramatically after that, all the more amazing.” 

Writing for The Conversation, Research Scientist Judah Cohen and Mathew Barlow of UMass Lowell examine how the polar vortex and moisture from a warm Gulf of Mexico created a monster winter storm that brought freezing rain, sleet and snow to large parts of the U.S. “Some research suggests that even in a warming environment, cold events, while occurring less frequently, may still remain relatively severe in some locations. One factor may be increasing disruptions to the stratospheric polar vortex, which appear to be linked to the rapid warming of the Arctic with climate change,” they write. “A warmer environment also increases the likelihood that precipitation that would have fallen as snow in previous winters may now be more likely to fall as sleet and freezing rain.”

Research Scientist Judah Cohen speaks with New York Times reporter Eric Niiler about his work linking increased severe winter weather in the United States to the stretching of the polar vortex. “We’ve shown in multiple papers now that the occurrence of the weak polar vortex is increasing in frequency, and the times when the polar vortex is strong or circular it’s happening less frequently,” says Cohen. 

In an interview with Gizmodo reporter Ellyn Lapointe, Research Scientist Judah Cohen highlights his work understanding the “complex relationship between global climate change, polar vortex behavior, and extreme mid-latitude weather.” Cohen explains that: “In our research, we have demonstrated that polar vortex stretching events have accelerated in the era of accelerated Arctic change. Climate change in general, but Arctic change in particular, is favorable for forcing these events. 

Research Scientist Judah Cohen explores the relationship between stretched polar vortex events and extreme weather in the United States, reports Andrew Freedman for CNN. “On the southern flanks of the polar vortex, over the US and Asia, and under that where that stretching is happening, there’s been an increase in severe winter weather,” says Cohen. “I’m not saying any one weather event is attributed to climate change, but I do think it loaded the dice here.”

Research Scientist Judah Cohen speaks with Associated Press reporter Caleigh Wells to explain how winter storm conditions can vary geographically. Farther south, “the snowflakes form, they fall and then they meet a warm layer, a layer above freezing, and they will melt,” explains Cohen. “But then there’s another layer near the surface that’s below freezing again, so they will refreeze before they hit the ground.” 

Research Scientist Judah Cohen speaks with Associated Press reporter Seth Borenstein about how warm Arctic waters and cold continental land have led to a stretched polar vortex, leading to a massive winter storm that will impact a large swath of the country. According to Cohen, “as far back as October 2025, changes in the Arctic and low sea ice were setting up conditions for the kind of stretched polar vortex that brings severe winter weather to the U.S.,” writes Borenstein. 

Research Scientist Judah Cohen speaks with USA Today reporter Doyle Rice about how the polar vortex could send a blast over cold air to areas of the central and eastern United States. “I believe that the entire cycle of a weak or disrupted polar vortex that began at the end of November is coming to its conclusion by the end of next week,” explains Cohen. “Clearly, the polar vortex is strengthening and some period of milder weather in the central and eastern U.S. looks inevitable to me.”  

Matt Carey MBA '17 and Greg Charvat, a former visiting researcher at the MIT Media Lab, co-founded TeraDAR, a startup that has developed advanced sensor technology that can see through various weather conditions that often confuse existing car sensors, reports Aaron Pressman for The Boston Globe. “We’re going to the last part of the electromagnetic spectrum that no one has ever been able to build a product at before,” explains Carey. “And instead of being able to see through your hand like an X-ray, we can see through rain and snow and dust and fog.”

Research Scientist Judah Cohen shares his thoughts on how the polar vortex will impact weather across the U.S. this December, reports Doyle Rice for USA Today. "My thinking is that the cold the first week of December is the appetizer and the main course will be in mid-December," Cohen explains. 

Prof. Emeritus Kerry Emanuel speaks with Washington Post reporters Ben Noll and Ruby Mellen about the 2025 hurricane season. “The thing that really powers the hurricane is how fast you can transfer heat from the ocean to the atmosphere. The bigger the temperature difference, the faster you can transfer heat. The faster you can transfer heat, the more powerful the hurricane can be,” says Emanuel. “This past summer, the sea surface temperatures across much of the tropical Atlantic were warmer than normal, which is part of what led people to predict that there would be a very busy season.”