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Observations made during the historic 2005 hurricane season document a case of "eyewall replacement." Clouds outside the hurricane eyewall coalesce to form a new eyewall at a greater radius from the storm center, and the old eyewall dies. The winds in the new eyewall are initially weaker than those in the original eyewall, but as the new eyewall contracts,(More)
The convection occurring in the tropical depression that became Hurricane Ophelia (2005) was investigated just prior to tropical storm formation. Doppler radar showed a deep, wide, intense convective cell of a type that has been previously thought to occur in intensifying tropical depressions but has not heretofore been documented in detail. The updraft of(More)
[1] Radial velocity (Vr) and reflectivity (Z) data from eight coastal operational radars of mainland China and Taiwan are assimilated for the first time using the ARPS 3DVAR and cloud analysis package for Pacific Typhoon Meranti of 2010. It is shown that the vortex-scale circulations of Meranti can be adequately established after only 2 hourly assimilation(More)
Multiplatform observations of Hurricane Rita (2005) were collected as part of the Hurricane Rainband and Intensity Change Experiment (RAINEX) field campaign during a concentric eyewall stage of the storm's life cycle that occurred during 21–22 September. Satellite, aircraft, dropwindsonde, and Doppler radar data are used here to examine the symmetric(More)
The ground-based velocity track display (GBVTD) technique was developed to estimate the primary circulations of landfalling tropical cyclones (TCs) from single-Doppler radar data. However, GBVTD cannot process aliased Doppler velocities, which are often encountered in intense TCs. This study presents a new gradient velocity track display (GrVTD) algorithm(More)
30 The Ground-based Velocity Track Display (GBVTD) was developed to deduce three-31 dimensional primary circulation of landfalling tropical cyclones (TCs) from a single-Doppler 32 radar data. However, its intrinsic closure assumptions prevent the cross-beam component of 33 the mean wind (M V) be resolved and consequently aliased into the retrieved(More)
2 Abstract 32 33 The Ground-Based Velocity Track Display (GBVTD) technique was developed to estimate the 34 primary circulations of landfalling tropical cyclones (TCs) from single-Doppler radar data. 35 However, GBVTD cannot process aliased Doppler velocities, which are often encountered in 36 intense TCs. This study presents a new Gradient Velocity Track(More)
One of the attractive features of a millimeter wave radar system is its ability to detect micron-sized particles that constitute clouds with lower than 0.1 g m −3 liquid or ice water content. Scanning or vertically-pointing ground-based millimeter wavelength radars are used to study stratocumulus (Vali et al. 1998; Kollias and Albrecht 2000) and(More)