2A.2
High-resolution dual-doppler analyses of the eyewall in an intense hurricane
PAPER WITHDRAWN
Peter P. Dodge Jr., NOAA/AOML/HRD, Miami, FL; and M. L. Black, J. F. Gamache, and F. D. Marks
On 21 and 22 August, 1999, the Hurricane Research Division of the National Oceanographic and Atmospheric Administration (NOAA) conducted two single-plane experiments in Hurricane Bret with P-3 aircraft from NOAA's Aircraft Operations Center (AOC). The flight pattern on the 21st was intended to survey the vortex and it's environment; at this time Bret was a Category 4 hurricane, with winds > 63m/s. The flight on the 22nd occurred as Bret, now a Category 3 storm with winds still > 50 m/s, made landfall on the South Texas coast between Corpus Christi and Brownsville.
On both days there was a module where the aircraft flew upwind inside the eye, at 4200 m altitude just inward from the eyewall. Because of the outward slope of the eyewall, GPS sondes were deployed such that they sampled the wind maxima at lower altitudes, finding winds > 74 m/s on the 21st, and > 60 m/s on the 22nd.
The tail Doppler radar was operated in Fore/Aft Scanning mode during both flights. Usually in hurricane penetrations we only get a few eyewall slices as the aircraft quickly crosses the eye, but during the eye circles many slices were collected at close range (<5 km) that will provide a detailed picture of the three-dimensional windfield in a portion of the eyewall on successive days. We will present the dual-Doppler windfields at the conference and a companion paper (Black et al) will combine the radar data with the GPS sonde data to provide further details of the low level wind maxima.
Session 2A, Tropical Cyclones (Parallel with Session 2B)
Thursday, 19 July 2001, 4:00 PM-5:30 PM
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