Research data and photographs obtained by aircraft reconnaissance in 1954 have clarified certain details of hurricane structure pertaining to the eye, the spiral rainbands, and circulation patterns.
A mound of stratocumulus clouds frequently present in the eye seems to be associated with the storm's circulation center. This “hub-cloud” in the presence of certain temperature distributions points to a level of non-divergence, usually below about 8000 feet, MSL.
Analyses of the rainband micro-structure reveal a tendency for a pressure minimum immediately adjacent to and on the high pressure side of the spiral bands. An explanation of this effect is proposed and the role it may play in the formation of parasite circulations or false eyes is suggested.
Finally, pictures taken from the airplane flying in the eye of the hurricane show cirrus clouds whose forms clearly establish the existence of a cyclonic indraft at very high levels over the eye.
* Published with permission of Commander, Air Weather Service. Views expressed are those of the authors and do not necessarily represent those of the Air Force.