6C.3
Boundary layer roll dynamic and thermodynamic structures as determined by dropwindsondes
Sim Aberson, Hurricane Research Division, AOML, Miami, FL; and D. P. Stern
Since 1997, 59 dropwindsonde profiles within tropical cyclone eyewalls
have reported extreme horizontal wind speeds (arbitrarily defined as wind
speed > 90ms-1). From these profiles, a schematic of the structure of
the features in which the extreme horizontal wind speed is located is
proposed. The features are located generally on the inner edge of the
eyewall, and curve upward, outward, and upwind with height. They are
in localized regions of relatively high vertical vorticity, and are
usually associated with updrafts and relatively high equivalent
potential temperature, suggesting convective meso- or miso-cyclones.
Recorded presentationSession 6C, Field Programs: RAINEX, TCSP and IFEX
Tuesday, 29 April 2008, 10:15 AM-12:00 PM, Palms H
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