Thank you for your kind words.
In order to really understand this you need to know more about why eyes exist in Hurricanes and a good, but rocket scientist version, can be found here …
There is a plethora of information about Hurricanes on this site.
But to answer your questions directly …
The proper term for ‘eyewall recycles’ as I (being a true amateur) put it, is ‘Concentric eyewall cycles’.
These phenomena normally happen in powerful Hurricanes of Category 3 status or higher.
The band of clouds immediately around the eye are often the most intense and they tend to suck a lot of moisture out of the eye which causes the Hurricane to weaken and can even lead to the collapse of the eye.
Many of the most powerful storms form an outer eye when this happens and the outer eye can completely replace the old inner eye … it has been known for Hurricanes to regenerate to their former intensity after this.
In the case of Rita, she has just completed a couple of eyewall recycles but it does not look like she will regain her former Category 5 intensity before landfall.
Well here’s hoping she won’t, but I sense she will regain a little power.
Regarding the pressure … if it falls the hurricane strengthens and if it rises the hurricane should weaken … Eyewall recycles often lead to a reduction in the pressure.
It is important to remember that other geographical and environmental factors have some influence in a Hurricane’s power and ability to cause destruction.
In Rita’s case, she has previously reached a very low pressure around 897 mb and this reading has probably caused the heavy surge around New Orleans.
She is now around 930 mb.
The subsequent rise in pressure does not necessarily mean that Rita will be any less damaging because the power generated by the 897 mb drop would have been quite awesome and will have a widespread affect on high tides all around the Gulf.
I hope this helps.