This evening the NHC designated the broad area of low pressure in the central Atlantic Invest 91L.
This began as a complex interaction between the most vigorous African wave of the season thus far (top), and a feature in the monsoon trough (bottom).
There was growing consensus in development in the ensembles, and that is slowly being realized as the two features in the August 25th image above began to interact and form the broad low we see this evening.
There is strong consensus on the guidance that this becomes a tropical cyclone in the next five days, with the Euro operational model and ensembles showing tropical cyclone genesis in the next 48-72 hours. The other guidance also shows development, increasing confidence that despite the omnipresent dry air that has dominated the Atlantic, this area has the best odds yet to overcome and develop.
The ensemble guidance and operational models, once again led by the Euro, show a potentially favorable environment as the low reaches the SW Atlantic. It is early to discuss track guidance as we do not have a well-defined low yet, but for now at least, long range guidance suggests ridging in the Pacific Northwest that may allow for troughing to keep this one away from the US coast.
Again, very early and not worth much discussion yet IMO.
The first step is development, and we will see if this gradual organization over the course of the day and evening convective activity allows for us to break the named storm drought.