Judah Cohen

@judah47 · Boston · joined 19 Jun 2009

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.

31 677Followers

4 027Following

35 646Posts total

123.7KViews on collected posts

Son gönderiler

Judah Cohen@judah479 Sep

Excited about my paper with Songmiao Fan published today demonstrating that Eurasian snow cover & Arctic sea ice variability influence the number of winter stretched #PolarVortex (SPV) events. It might be a super El Nino but there will be SPVs this winter: https://t.co/K5CF6nC1iE 2.1K views · 21 likes · 7 reposts · 0 replies Open on X →

Judah Cohen@judah479 Sep

I am looking forward to speaking tomorrow night at the @MITMuseum during the "After Dark: Cold" event. Of course when the theme is cold, who are you going to call? Dr. Freeze. Will be speaking on Arctic change, the #PolarVortex, extreme #cold and #snow: https://t.co/mYvCT85lHa 1.3K views · 12 likes · 0 reposts · 2 replies Open on X →

Judah Cohen@judah479 Sep

It was lots of fun talking #winter weather, the polar vortex and the application of AI to long range weather forecasting with the folks at @TeamVeriten: https://t.co/bwdd1BFkGE 2K views · 15 likes · 0 reposts · 3 replies Open on X →

Judah Cohen@judah479 Sep

@judah47 Hopefully cold winter in Scandinavia whole late now - mar. 37 views · 1 likes · 0 reposts · 0 replies Open on X →

Judah Cohen@judah478 Sep

Looking likethe first stretched #PolarVortex (PV) is underway bringing with it cooler temperatures & even #snow to East Asia & eastern North America. Impacts are easy to miss in early September but this won't be the last of the 2026/27 PV season with more noticeable impacts later

GIF

7.1K views · 127 likes · 18 reposts · 4 replies Open on X →

Judah Cohen@judah4720 Nov 2025

@judah47 The 81-82 event was a quick hitting SSW 12/4/81. NAM response not very strong. SPV has a stretched look. But it had an impactful blocking episode late Dec into early Jan. Just one example https://t.co/YyArtTr0a9

1.3K views · 8 likes · 0 reposts · 2 replies Open on X →

Judah Cohen@judah4720 Nov 2025

@judah47 Aren’t wave reflection events precursors to extreme cold in North America? Similar occurred in 2014. 4.1K views · 6 likes · 1 reposts · 2 replies Open on X →

Judah Cohen@judah4720 Nov 2025

@judah47 I feel like the story doesn’t end here. Yes, the PV will stretch, but it seems to me that the strong -QBO will keep the PV vulnerable to another, potentially much more impactful SSW down the line. Throw in the SCE dipole teleconnection and I think it’s a virtual lock for 5.8K views · 24 likes · 1 reposts · 4 replies Open on X →

Judah Cohen@judah4720 Nov 2025

I have seen enough & I am ready to make the early call - the upcoming #PolarVortex (PV) disruption should be categorized as a stretched PV/wave reflection event. Whether it crosses the line over into a sudden stratospheric warming event is almost irrelevant. Premature? We'll see.

GIF

100K views · 245 likes · 23 reposts · 36 replies Open on X →

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Erişim, %6.25%bu hesap3.67%10K–100K için medyan

Etkileşim, %1.31%bu hesap1.61%10K–100K için medyan

Ölçüt	Bu hesap	10K–100K için medyan	Oran
Gönderi başına medyan görüntülenme	1 979	993	1.99×
Erişim (görüntülenme ÷ takipçi)	6.25%	3.67%	1.70×
Etkileşim oranı	1.31%	1.61%	0.81×

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Growth & engagement

How the posts we collected actually performed: views and reaction rate post by post, what the audience did with them, and where the follower count goes.

Views per post

100K20 Nov

5.8K

4.1K

1.3K

7.1K8 Sep

379 Sep

1.3K

2.1K

Last 9 collected posts, oldest on the left. The scale is logarithmic: one post can outrun the rest a hundred times over.

Engagement rate per post

0.30%20 Nov

0.50%

0.22%

0.79%

2.10%8 Sep

2.70%9 Sep

0.91%

1.09%

1.31%

Reactions — likes, reposts, replies and quotes — divided by views. Median for 10K–100K accounts is 1.61%.

What the audience does

Likes76.2%459 in total

Reposts8.3%50 in total

Replies8.8%53 in total

Bookmarks6.6%40 in total

Share of every reaction we collected for this account. Replies mean argument, reposts mean endorsement, bookmarks mean the post was worth keeping.

The follower curve appears once this account has two daily snapshots — we take one a day, and this one is on its first.

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Growth & engagement

Views per post

Engagement rate per post

What the audience does

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