User blog comment:MarioProtIV/The tropical cyclones missed by NHC/@comment-26971007-20161130223816



I think a tiny area of convection with a well-defined circulation from April 17-18 may have briefly taken on subtropical characteristics. ASCAT shows that the circulation is well-defined, and on satellite imagery. It is highly unusual for an extratropical cyclone to have shower activity this close to its center, and have a circulation this well-defined.

While the July system near Newfoundland looked very much like a tropical cyclone, its circulation was probably not as well-defined as it needs to be for classification as a tropical storm, although it did have fairly deep convection and tropical storm-force winds.