Assimilation of Doppler Weather Radar Data in WRF Model for Numerical Simulation of Structure of Cyclone Aila (2009) of the Bay of Bengal at the Time of Landfall - Monitoring and Prediction of Tropical Cyclones in the Indian Ocean and Climate Change - page 311

Fig. 5: Wind at 850 hPa from CTRL, DWR1, DWR2 and DWR3
experiments at 0900 UTC.
6. Summary and Concluding Remarks
In this study the influence of the radar data on the structure of cyclone Aila
(2009) near landfall during 0600 UTC to 0900 UTC of 25 May 2009 is
examined. Maximum surface wind speed produced after final analysis in data
assimilation experiments are very close to observed value. Impact of radar
data on SLP is less because the ADAS system does not directly update pressure.
The reduction in SLP is achieved through model adjustments when pressure
responds to the analysed winds. In all the data assimilation experiment, centre
of the vortex is relocated. However, inter comparison of the location of system
in assimilation experiments suggests that the centre of the cyclone in DWR3
experiment is much closer to the observed position. This shows that assimilation
of both reflectivity and wind data have relocated the system further close to
the observed position. The assimilation of DWR reflectivity data (DWR1
experiment) resulted in a significant improvement on the hydrometeor structures