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Hurricane Isabel -
The eye of Hurricane Isabel during the time the storm achieved Category 5 intensity had five clearly identifiable small vortices rotating
with it, giving the cloud pattern a pinwheel structure. The reason why these vortices form is still not well understood. Numerical models
sometimes show transient features similar to these vortices. During Isabel, a NOAA research aircraft actually flew though these vortices
and measured their structure, so we should be learning more about the vortices as research based on observations and modeling progresses.
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