Doesn't this indicate the eyewall replacement cycle?
Last night this value was "Closed".
Can the eyewall become closed again tonight and tomorrow? It is supposed to run over a patch of warmer water tonight.
With MAJOR help from the Hurricane Hunters:
The value at H. means that the sea-level minimum pressure was extrapolated (down at the end of the message, it says it was based on the plane's altitude at the 700-mb level). If the measure was measured from a dropsonde, then just the pressure would be present.
The text at L. (where you saw the "closed" last night and see the "Open E-SW" tells the condition of the eyewall. Closed means that the eye is completely surrounded by thunderstorms, while open tells that it's open (the directios, if more than one are clockwise).
As for the eyewall replacement cycle (ERC), that's what Rita's been going through for the past few hours. That report suggests that it's almost done with it.