Adrian is a category 4 hurricane this morning with winds of around 140 mph. The hurricane was upgraded to category 4 yeaterday (Thursday June 9th) afternoon. The NHC noted yesterday that:
THE HURRICANE HAS THE OPPORTUNITY TO STRENGTHEN A LITTLE MORE...BUT
SINCE ADRIAN IS BECOMING ANNULAR...IT WILL PROBABLY FLUCTUATE
LITTLE IN INTENSITY AND WILL NOT WEAKEN UNTIL THE CIRCULATION
BECOMES WELL EMBEDDED WITHIN STABLE AIR AND COOLER WATERS IN A
COUPLE OF DAYS.
I looked in the NHC Glossary to determine what exactly this meant, but found no information on the NHC page about what an annular hurricane is. Thus, a Google search was required and I found the following:
From "canetalk": An annular hurricane or truck tire pattern hurricane is a tropical cyclone in the Atlantic or Eastern Pacific Oceans that features a large, symmetric eye surrounded by a thick ring of intense convection. This type of storm is not prone to the fluctuations in intensity associated with eyewall replacement cycles, unlike typical intense tropical cyclones. Annular hurricanes also tend to persist, even when encountering environmental conditions which easily dissipate most other hurricanes
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