We're changing our WunderBlogs. Learn more about this important update on our FAQ page.

2012 Atlantic Hurricane Season Birdseye Discussion #167B (Special Update)

By: NCHurricane2009 , 10:31 AM GMT on December 02, 2012

...SUNDAY DECEMBER 2 2012...5:30 AM EDT...
Formation of a post-season subtropical or tropical cyclone in the middle of the open Atlantic becoming very likely this morning...

Despite the official end of the 2012 Atlantic Hurricane Season on November 30...a surface low currently centered near 43.5W-20N is gaining tropical characteristics with an impressive comma-shaped area of thunderstorms in its northeast half. Hovmoller diagrams from the National Hurricane Center (http://www.nhc.noaa.gov/tafb_latest/gehov2latest. gif) indicate that the south end of an upper trough cut-off in the middle of the Atlantic around November 27...upon since when the cut-off upper trough's eastern divergence supported a distinct area of thunderstorms and gradual formation of this surface low.

According to the latest surface maps from the National Hurricane Center TAFB...the system has no surface fronts attached to the surface low. Coupled with the impressive comma-shaped thunderstorm mass this morning...the system at least appears to be a subtropical cyclone...which is a system that has a shallow vertical warm core from thunderstorm latent heat release but the thunderstorms are generated by upper divergence and-or instability from a cold core upper trough/vortex.

Despite the fact that the thunderstorm activity is currently supported by an upper trough...the comma shaped area of thunderstorms has generated anticyclonic warm core upper outflow across the east half of this system according to the latest satellite-derived 200 mb upper winds. Warm core upper anticyclones are more indicative of a fully-vertical tropical warm core...and therefore this system may become fully tropical despite the water temps currently below 26 deg C.

This feature is currently designated as Invest 91-L on the Navy NRL site. Latest info of this system can be found on www.nhc.noaa.gov. In lieu of this system...I will be resuming full birdseye discussions late tonight.

The views of the author are his/her own and do not necessarily represent the position of The Weather Company or its parent, IBM.

Reader Comments

Comments will take a few seconds to appear.

Post Your Comments

Please sign in to post comments.

Log In or Join

You be able to leave comments on this blog.

Display: 0, 50, 100, 200 Sort: Newest First - Order Posted

Viewing: 2 - 1

Page: 1 — Blog Index

2. WunderAlertBot (Admin)
3:58 PM GMT on December 03, 2012
NCHurricane2009 has created a new entry.
1. KoritheMan
10:43 AM GMT on December 02, 2012
Thanks for the post. Did you see that another system may develop on the heels of this one in a few days?
Member Since: December 31, 1969 Posts: Comments:

Viewing: 2 - 1

Page: 1 — Blog Index

Top of Page
Ad Blocker Enabled

NCHurricane2009 doesn't have a bio yet.

NCHurricane2009's Recent Photos

Nov 8 2012 Tropical Atlantic Atmospheric Features