Judah Cohen
@judah47
Love snow & skiing. Always trying to push the boundaries what we can forecast about the weather on seasonal to sub-seasonal time-scales. My personal account.
My interview this morning on The Weather Channel, discussing what else but the #PolarVortex! A preview of this week's blog.
We spoke with Dr. Judah Cohen, Director of Seasonal Forecasting at Verisk Atmospheric and Environmental, who developed an algorithm to predict cold and snowfall anomalies over North America during Winter:
BSF grantee Dr. Judah Cohen @judah47 helps shed light on why parts of the Eastern U.S. have seen colder winters and more heavy snowfalls over the past 25 years - in a new BSF-supported study with Israeli collaborator Prof. Chaim Garfinkel of @HebrewU. ❄️
A great article summarizing different areas of research by @MichaelEMann and @judah47 eos.org/articles/new-r…
We're in peak summer and it's looking like this summer is following the recent decadal trend, who will be hot & who not so hot? And can you believe we're only a little more than a month from the return of the #PolarVortex, who's excited? Blog is now public published.aer.com/aoblog/aoblog.…
Nice in depth article by @bberwyn on not one but two science articles on trends in severe winter weather. One one on strengthening nor'easters & ours on attributing winter trends to stretched #PolarVortex events. So for winter weather lovers a twofer: insideclimatenews.org/news/14072025/…
It’s getting warmer… so why are U.S. winters still so brutally cold? ❄️ A new study by NSF-BSF grantees Prof. Chaim Garfinkel (@HebrewU) & Dr. Judah Cohen @judah47 (AER) finds the answer high above the Arctic - in the shifting polar vortex. 👉Study: science.org/doi/10.1126/sc…
Sick & tired of the heat & humidity & you need a cool, refreshing break? How about a free article on the polar vortex & how it's fickle nature is bringing surprising winter temperature trends to the US, including warming to some parts & cooling to others: science.org/doi/10.1126/sc…
For all those that tweet at me that there is a or an imminent sudden stratospheric warming in the Southern Hemisphere, I really don't see any evidence at all.
It's my favorite term these days to describe the summer pattern - "ring of fire" as heat domes slosh around the continental mid to high latitudes. But where will the heat domes call home for most of the summer bring the warmest weather? Blog is now public: published.aer.com/aoblog/aoblog.…
The tropospheric circulation is beginning to form the "ring of fire" pattern that I often describe the summer features favoring widespread warmth across the continents. Also included is the AER summer forecast. Do you think any resemblance? Blog now public published.aer.com/aoblog/aoblog.…
They say timing is everything. Well the #PolarVortex disruption of March with its impacts reaching a crescendo in late May is timed to equally frustrate winter lovers and those eager for an early start to summer, bringing March in May. Blog is now public: published.aer.com/aoblog/aoblog.…
the #PolarVortex (PV) might be gone but not forgotten. The PV left a party favor some will view as a treat & others as a trick. Memorial Day is the unofficial start of the summer but promises to be chilly in the Eastern US & Europe thanks to the arrival of high-latitude blocking.
The large #PolarVortex disruption from the 2nd week of March is coming to its climatic end the 4th week of May with the largest polar cap heights finally making its way to the mid-troposphere, Greenland blocking & relatively cool temperatures in Europe, the eastern US & East Asia
Excited about our new review paper (Ye et al., 2025) on the relationship between snow/ice variability & weather extremes. I will highlight analysis that shows a strong relationship between fall Siberian #snow cover & cold extremes in eastern North America: nature.com/articles/s4161…
Well it is called the #PolarVortex (PV) blog so I am hanging in there until the PV takes it last breadth, which is imminent. But I discuss the PV's parting shot on our weather, aka Greenland blocking as it heads for the exit until the fall. Blog now public published.aer.com/aoblog/aoblog.…
Most have probably moved on from the #polarvortex (PV) thinking of beach days & summer vacations but not me. The PV is still lurking out there & it looks to make another pass at the Northeastern US in early May, what weather could it bring? Blog now public published.aer.com/aoblog/aoblog.…
The large #PolarVortex disruption now a month in duration is still influencing our weather with tentacles descending from the stratosphere & touching our weather. Latest tentacle bringing winter in spring but when is the next &/or last one. Blog now public published.aer.com/aoblog/aoblog.…
As uneventful the #PolarVortex (PV) split has been so far, it is rare (or even unprecedented) to be able to say one daughter PV center is over merry ol' England and the other daughter PV center is over New England!
I haven't shared our estimate of the Northern Hemisphere snowfall anomalies all winter but here it is for winter 2024/25. Big winners - Japan, coastal Alaska, Great Lakes, Eastern Canada and in general higher latitudes and altitudes. Notable mention, parts of the Southeastern US.
The very large #PolarVortex disruption continues unabated with multiple PV centers circumnavigating the globe in record time. I discuss why with such an impressive PV disruption the weather impact is underwhelming & could that change? Blog is now public: published.aer.com/aoblog/aoblog.…