Judah Cohen

I do hope to go to this #wxtwitter get together tomorrow night (if I can stay awake) as part of #AMS2020. Would be nice to put faces to handles and if you previously promised me a beer, I am collecting!pic.twitter.com/zYNGQwAB8O

The 594 geopotential heights did verify and was in the 0z GFS analysis from last night.pic.twitter.com/6ZZApF4CGk

It's been that kinda winter when I am left with posting GFS fantasy snowfall maps. What's the over/under on this 6z GFS snowfall map for the Boston area?pic.twitter.com/yLaRyOMlBY

Gotta "make hay while the sun shines." GFS predicting just enough North Atlantic blocking to bring the best opportunity for #snow to Eastern US & Europe for #winter 2019/20, which isn't saying much. No denying we are entering the back 9 of what has so far been mostly a non-winterpic.twitter.com/yxXg4ujIFS

Will see if this verifies but 594 hPa geopotential heights along the US Eastern Seaboard in January is ridiculous! Those heights are impressive for July, in January that is off the charts. Happened in February 2018 so may be something that we need to get used to.pic.twitter.com/JBn9ek0OwT

Clearly Mother Nature (or ECWMF) is trolling #AMS2020.pic.twitter.com/pHjHAb3sDG

What the North Atlantic taketh away the North Pacific giveth. Predicted strong Alaskan blocking will force lower heights into east N America (& Eurasia) & #cold air to become more widespread across North America and increase the chance of #snow across the US & surprisingly Europepic.twitter.com/DwzVZvpUWM

Biggest takeaway I see this morning is the GFS backing away from European ridging pushing north into the Arctic. This reduces the odds of a significant #PolarVortex disruption in the foreseeable future & therefore an extended period of severe #winter weather. 1 run-could changepic.twitter.com/ReWMZl6GPH

I haven't had much reason to tweet #PolarVortex (PV) animations lately, but this morning's GFS predicting a stretching of the PV which should allow at least a temporary injection of #cold air into Siberia and especially Canada. Will be interesting to see if it can evolve further.pic.twitter.com/msnxgylDB5

GFS predicting that the #PolarVortex (PV) will become elongated in both the stratosphere & troposphere. In the troposphere this allows ridging from the Pacific & Atlantic to pinch the tropospheric PV into two pieces one in Siberia & the other in Canada each with its own #cold airpic.twitter.com/DRVSvIX8lS

You know things are really dire when I am looking at the MJO forecasts for a pattern change. Here is hoping the GFS is on to something with its week-2 forecast of a robust phase 7 MJO that favors high latitude blocking and an East Coast trough.pic.twitter.com/sRpO7aSdGE

Myself & others are anticipating a more significant disruption of the #PolarVortex (PV) but my estimate of the January sea level pressure anomaly is 180 degrees out of phase with the pattern needed to disrupt the PV. That has to change before any significant disruption can occur.pic.twitter.com/lszmeTDdTr

The polar cap heights (PCHs) plot suggestive of troposphere-stratosphere-troposphere strong #PolarVortex (PV) coupling event with tropospheric precursor this week & strong PV next week. If cycle is completed with #cold PCHs at the surface late Jan/early Feb put a fork in #winter!pic.twitter.com/Omdr0ueWj9

The GFS is predicting a change in the #PolarVortex (PV) mid-month. How might this impact the weather across the Northern Hemisphere and what are my expectations for the PV behavior for the rest of the #winter: https://bit.ly/35q5sSF pic.twitter.com/8JzS4uidCW

#Wxtwitter is a flutter how #AMS2020 will be a torch in #Boston with no chance of #snow well latest GFS just said, "hold my beer."pic.twitter.com/3ETS3kE2t9

If you can't beat 'em, join 'em. So far this #winter stratosphere-troposphere coupling of cold polar cap heights (PCHs) & positive #Arctic Oscillation (AO) has swamped warm PCHs/AO- leading to an overall mild winter in East US & Europe. Not much change in the foreseeable future.pic.twitter.com/53MMUEwmnG

The #polarvortex has been relatively strong and unperturbed for much of the #winter so far. Some early signs of a relatively minor perturbation where the PV starts to become elongated. Would suggest #cold temperatures in western North America and Siberia.pic.twitter.com/ZC7jQVwPzh

It has been a relatively quiet #winter period across North America outside of Alaska but that should end thanks to strengthening ridging south of the Aleutians resulting in deepening troughing across Western Canada & the US. First comes the #snow followed by the #Arctic air.pic.twitter.com/l4iFBacs5j