Improved Doppler Velocity Dealiasing for Radar Data Assimilation and Storm-Scale Vortex Detection
Figure 2
(a) Raw radial-velocity image scanned by the KTLX radar using VCP12 with 26.1 m s−1 at 4.0° tilt for the Oklahoma tornadic storm system at 22:12:23 UTC on May 24, 2011. (b) Dealiased radial-velocity (seed data) image produced by the improved reference check alone. (c) Dealiased radial-velocity image (with the special data points plotted in purple) produced by the first one-way forward procedure in the continuity check after the improved reference check. (d) Final dealiased radial-velocity image produced by the new extended AR-Var-based method. (e) As in panel (c) but the first guess is from the RAP-predicted wind field for the refined AR-Var analysis. (f) As in panel (d) but the first guess is from the RAP-predicted wind field for the refined AR-Var analysis. The white letters “A” in panel (a) mark the main aliased-velocity areas. The white letters B1 and B2 in panel (c) mark the two flagged (in black) peninsula areas. The white letter B2 in panel (d) marks the remained flagged peninsula area. The large (or small) yellow circle marks a mature (or emerging) tornadic mesocyclone in panels (a) and (f), and a magnified frame is inserted to show the mature tornadic mesocyclone in panel (f). The green contour on the bottom of each panel shows the boundary between Oklahoma and Texas states. The color scale for the radial velocity is plotted on the top of each panel.
