Might want to check out some of these papers presented at the 61st Interdepartmental Hurricane Conference a few weeks ago in New Orleans. Wish I had known about it ahead of time, looks like it was worth attending:
http://www.ofcm.noaa.gov/ihc07/linking_file_ihc07.htm
Note the talk on the proposed graphical Tropical Weather Outlook which was discussed here last month. Good presentation on Katrina's double eyewall structure at landfall, and model changes/implementation for 2007.
You'll need the free Microsoft PowerPoint viewer to access the presentations:
http://www.microsoft.com/downloads/deta ... layLang=en
61st Interdepartmental Hurricane Conference Papers Online
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Derek Ortt
I am in strong disagreement to a double eyewall structure of Katrina at landfall.
It may have been a transient feature, which we have seen in model simulations of Katrina. There was not a well defined wind maximum at landfall (the little bump was no different than the day before, except that the eyewall decayed, there was no inward propagation on the flight level data).
Come to my Masters defense in a couple of months (should be around that time frame) as I address this topic
It may have been a transient feature, which we have seen in model simulations of Katrina. There was not a well defined wind maximum at landfall (the little bump was no different than the day before, except that the eyewall decayed, there was no inward propagation on the flight level data).
Come to my Masters defense in a couple of months (should be around that time frame) as I address this topic
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wxman57
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THe paper presented that there may have been an outer eyewall starting to form at landfall, I believe. Dropsondes seemed to support an outer wind max near Pascagoula. Satellite examples weren't as clear-cut as some others I've seen, though. Would like to see your thesis defense, Derek, but I think I'll be too busy. 
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Derek Ortt
you may still get to see it as I may have to set up a webcam so that a committee member can see it
The FL wind did show a bumb in the winds enar Pascagoula; however, that bump was there 24 hours and seems to have been the principal band, not a secondary eyewall
One thing I have seen, never use a single microwave image to determine if there is a seocndary eyewall, you may get burned by something transient (if I sent you my ppt of my Boulder talk from last month, refer to the fractional rainrate Hovmoller slide)
The FL wind did show a bumb in the winds enar Pascagoula; however, that bump was there 24 hours and seems to have been the principal band, not a secondary eyewall
One thing I have seen, never use a single microwave image to determine if there is a seocndary eyewall, you may get burned by something transient (if I sent you my ppt of my Boulder talk from last month, refer to the fractional rainrate Hovmoller slide)
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