A Radar Wind Analysis System for Nowcast Applications

Figure 6

Horizontal winds (shown by arrows) (a) at = 0.7 km produced without using the shear-dependent factor in (12), (b) at = 0.7 km, and (c) at = 1 km produced by using the shear-dependent factor to construct the background error covariance matrices in (10) and (11a) and (11b) for the ice storm case in Figure 4. The color images in (a) and (b) are the dealiased radial velocities at 0.5° tilt. The color image in (c) is the dealiased radial velocities at 1.5° tilt. The vector scale is the same for the three panels and is plotted at the lower-left corner of (b). The domain size is 160 × 160 × 5 km³. The horizontal resolution is = = 2 km and the vertical resolution is = 50 m. The radial-velocity color scales are the same as those shown on the top of each panel of Figure 4.

(a)

(b)

(c)