ATL: ARTHUR - Post-Tropical

[xironman]

I am surprised with the wind field they went tropical.

[Sciencerocks]

[johngaltfla]

This storm is useless without a name.

There, the season has begun.

Buckle up buttercups.

[USTropics]

I am surprised with the wind field they went tropical.

TD One's position under the trough axis and location next to the Gulf Stream is aiding tropical processes. It has since detached from the warm frontal boundary today, and has gained tropical characteristics (the dying frontal boundary to the east is making it appear the wind field is more expansive than it is). There's definitely some consolidating that still needs to occur (circulation near the surface remains broad), but you can see from GFS and UKMET phase evolutions (images below) the inner-core remains tropical for now:

UKMET phase evolution


UKMET SSTs with track overlay:

[cycloneye]

[bp92]

And for the sixth year in a row, we're off to an early start.

[Kazmit]

I am surprised with the wind field they went tropical.

TD One's position under the trough axis and location next to the Gulf Stream is aiding tropical processes. It has since detached from the warm frontal boundary today, and has gained tropical characteristics (the dying frontal boundary to the east is making it appear the wind field is more expansive than it is). There's definitely some consolidating that still needs to occur (circulation near the surface remains broad), but you can see from GFS and UKMET phase evolutions (images below) the inner-core remains tropical for now:

UKMET phase evolution
https://i.imgur.com/sBVVuEN.png

UKMET SSTs with track overlay:
https://i.imgur.com/0dbk88v.png

Pretty cool how it will "tightrope" the Gulf Stream during its entire lifetime.

[alan1961]

It won't be long before this is named, its gathering momentum quickly.

[wxman57]

And for the sixth year in a row, we're off to an early start.

If you really count subtropical-nothing Andrea last year.

[TheStormExpert]

TD #1 is the first tropical cyclone to not originally start off Subtropical since coincidentally Hurricane Arthur in 2014.

 https://twitter.com/hurrtrackerapp/status/1261775145439563776

[TheStormExpert]

And for the sixth year in a row, we're off to an early start.

If you really count subtropical-nothing Andrea last year.

Well at least TD #1 will last 48hrs. longer!

[cycloneye]

Based on the winds of TS force the plane has found Arthur at 11 PM is on tap.

[Kazmit]

Recon is finding 45kt flight level winds- could support an upgrade.

[TheStormExpert]

Should be Arthur at the 11pm advisory.

 https://twitter.com/DerekOrtt/status/1261818886623760385

[Nancy Smar]

NHC issuing advisories for the Atlantic on TS Arthur

[TheStormExpert]

Should be Arthur at the 11pm advisory.

https://twitter.com/DerekOrtt/status/1261818886623760385

Well this aged well. Welcome Arthur, our first named storm of what is likely to be yet another busy Atlantic Hurricane Season.

[toad strangler]

 http://twitter.com/philklotzbach/status/1261854326189748226

[Hammy]

Interesting that four of the last five Arthurs have formed in roughly similar places and affected the Outer Banks--in fact three of those forming off of Florida (1996, 2014, 2020) and in three different months.

[ROCK]

Let’s begin shall we going to be a rough one this year IMO...

[Sciencerocks]