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 309

Fig. 3: MSLP from CTRL, DWR1, DWR2 and DWR3 experiments
at 850 hPa at 0900 UTC 25 May 2009.
minimum SLP is reduced only by about 2 hPa in the analysis. Small impacts of
radar data on MSLP may be due to the fact that the assimilation of radar data
does not directly update pressure. On comparing location of system in CTRL
run with the DWR1, DWR2 and DWR3 experiments, it is observed that system
is relocated in data assimilation experiments. However, the centre of the cyclone
in DWR3 experiment is very close to the observed position. This indicates that
assimilation of both reflectivity and wind data have relocated the system very
close to the observed position.
Figure 4 depicts that the assimilation of DWR reflectivity data along with
wind data (DWR3 experiment) resulted in a significant improvement on the
hydrometeor structures and inner core convection especially in eye wall and
rain band regions of the cyclone.
Figure 5 depicts the comparison of maximum surface winds (MSW) at the
end of data assimilation experiments (0900 UTC 25 May) and MSW from
control (CTRL) experiment. The estimated MSW is 60 kts and CTRL run