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Since 2012 on the now retired Weather Underground blogs, I have been posting annotated "birdseye view" charts of the Atlantic basin, with a detailed explanation and forecasting that references the chart. From there you may know me as "NCHurricane2009." While I now do these "birdseye view" posts here, I will continue to do comments at Yale Climate Connections via Disqus where the former Weather Underground community has moved to. Feel free to reply to me there, at my Disqus feed at this link, or via e-mail at 

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*******Note that forecasts and outlooks in this post are NOT the official forecast from the National Hurricane Center (NHC). They are my own detailed views on the Atlantic tropics based on current observations and latest computer model runs. As such do not make decisions based on my posts...consult news and warnings from your local weather office...and any evacuation orders issued by local governments to make the most informed and best decisions. Visit the NHC website (hurricanes dot gov) for the latest watches/warnings and official forecasts on active tropical cyclones.**********

...MONDAY NOVEMBER 25 2019 3:40 PM EDT...

Tropical Storm Sebastien finally transitions into a strong frontal cyclone heading into the northeastern Atlantic and moving toward the British Isles of western Europe...see remnants of Sebastien section below for additional details.

REMNANTS OF SEBASTIEN...While moving rapidly northeastward from the Azores into even cooler northeastern Atlantic waters...Tropical Storm Sebastien finally lost its core of thunderstorms and tropical characteristics..but has maintained its strength while supported by the eastern divergence zone of a large upper trough moving across the central Atlantic. The broad north Atlantic frontal low that was once supported by this upper trough has reached its classical mature and weakening phase while becoming aligned directly below the upper trough axis where there is a lack of supporting divergence. Therefore it appears the remnant frontal cyclone of Sebastien will become the dominant cyclone in the region...which is why I continue to mention the British Isles and parts of northern Europe as areas of impact from Sebastien for tomorrow through Friday on the home page of this site. It should be noted that by Friday the remnant cyclone of Sebastien should elongate north-to-south into a strong cold front moving into northern Europe from the Scandanavian peninsula as the supporting upper trough from the central Atlantic merges with a polar upper vortex located to the north of the Scandanavian peninsula.

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