Data Assimilation ofWeather Radar and LIDAR for Convection Forecasting and Windshear Alerting in Aviation Applications - Data Assimilation for Atmospheric, Oceanic and Hydrologic Applications - page 542

Perturbation Horizontal Velocity (u-<u>)
9:54 UTC

5 (m/sec)

2

u-<u>
(m/sec)

1

12
10
8
6
4
2
0

0

− 2

− 4

− 6
−

1

−

8

10

−

− 2

− 2 − 1 0 1 2

West - East (km)

Fig. 22.16 4DVAR-analyzed horizontal wind vectors (as arrows ) and perturbation horizontal
velocities (u - ,in colour contours ) at a height of 200 m above sea level. Locations of small-

scale cyclones and anticyclones are enclosed in pink ellipses

< u >

Perturbation Horizontal Velocity (v-<v>)
9:54 UTC

5 (m/sec)

2

V-<V>
(m/sec)

1

8
6
4
2
0
− 2
− 4
−

0

6

8
− 10
−

−

− 1

12

− 14

− 16

− 2

− 2 − 1 0 2

1

West - East (km)

Fig. 22.17 4DVAR-analyzed horizontal wind vectors (as arrows ) and perturbation horizontal
velocities (v - < v > ,in colour contours ) at a height of 200 m above sea level