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2023 - tracking the tropics


mcglups
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2 minutes ago, UnitedWx said:

And some wonder why some of us are so harsh on the media! Some organization really said that... or just some HACK on X??

I can't remember the source but they ran some sort of computer simulation based on population, infrastructure etc...it was fairly interesting even if it wasn't exactly scientific.

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1 hour ago, WxWatcher007 said:

As the tweet suggests, while there’s significant uncertainty over the strength and orientation of an E CONUS trough, there is a strong cross guidance signal of a more amplified ridge over the maritimes.

That’s a big deal IMO, because while that’s probably not enough by itself to cause land impacts (Bermuda aside), the impact of that ridge amplification probably blocks a quick escape and limits the odds a truly progressive trough develops. It also increases the odds that this bends more NW/NNW after the initial turn north.

 

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Comparing a pre-loading composite of all recent EC landfalls to the current pattern, I think that the risk for a landfall is unlikely outside of Nova Scotia. Looking at the pattern from a week out until landfall, we see an amplified trough digging into the Plains that leads to a strong blocking high forming just NE of Maine. This is not the case here.


There is a weak, progressive trough that moves into the OH Valley that doesn't serve to establish a blocking high at all. In fact, the strongest positive anomalies are north of the Great Lakes. The rather zonal flow over Nova Scotia is probably why this storm is going to escape east... without that strong blocking high the landfall scenario looks unlikely without a large change in the pattern. Even a capture scenario would be possible if the trough dug more, but the pattern just doesn't look amplified enough.

ezgif-4-f5bd557087.gif.430f2c2fd0bb42a56df378bebe5c65f7.gif262386369_gfs-ens_z500a_atl_fh66-240(2).thumb.gif.50f069c285858715ecb3091de67678cf.gif

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11 minutes ago, UnitedWx said:

And some wonder why some of us are so harsh on the media! Some organization really said that... or just some HACK on X??

Wouldn't jump on media with this... JB has a big following and post an image of 1938 once every hurricane season... even yesterday there were posts everywhere showing the Korean model redux of 38 prediction.  If folks are going to share and posts those outlandish maps, the media is going to run with them...

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1 minute ago, brooklynwx99 said:

The EPS is more what you'd want to see for an EC landfall with higher positive anomalies over SE Canada and a bit more digging with the trough over the E US, but even then it's far from ideal

eps_z500a_atl_41.thumb.png.6f3c0aaea93c3b7ed3f43489691b982e.png

You really need a sharp trough in the GL/OV and stout ridge in the maritimes. These positively tilted troughs won't do it.

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3 minutes ago, brooklynwx99 said:

The EPS is more what you'd want to see for an EC landfall with higher positive anomalies over SE Canada and a bit more digging with the trough over the E US, but even then it's far from ideal

eps_z500a_atl_41.thumb.png.6f3c0aaea93c3b7ed3f43489691b982e.png

 

1 minute ago, CoastalWx said:

You really need a sharp trough in the GL/OV and stout ridge in the maritimes. These positively tilted troughs won't do it.

Yup

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1 minute ago, CoastalWx said:

Too much stuff going on for my liking. I feel like people always forget how hard it is to get a legit cane into SNE.

Expectations through the roof and out of whack. That little s/w is the perfect illustration of why this is still a low probability deal despite the general trend. The smallest thing can force this east, especially given how soon it’s expected to turn N. If this got buried in the central/NW Bahamas there’d be more wiggle room.

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