Wind Field of a Nonmesocyclone Anticyclonic Tornado Crossing the Hong Kong International Airport
GBVTD retrieval of the three-dimensional tornado-relative axisymmetric winds for (a) 0941, (b) 0945, (c) 0950, (d) 0954, and (e) 0958. The horizontal axis indicates distance (in meters) from tornado center and the left (right) vertical axis indicates height above ground level of the GBVTD analysis (LIDAR observation). A Hövmoller diagram of the GBVTD winds at 60 m AGL is shown in (f). Time is on the vertical axis and radial distance from tornado center is on the -axis. Vectors represent the radial-vertical winds (m ), color contours depict the tangential winds (m ), and the line contours are of angular momentum (kg km m−2 s−1). Radial inflow decreases outside of the radius of maximum winds with time. Low-level angular momentum increases at 0954, just prior to maximum tornado intensity.
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