Simulation of Pre-monsoon Cyclones of Two Contrasting Monsoon Years Using Mesoscale Model WRF (ARW) - Monitoring and Prediction of Tropical Cyclones in the Indian Ocean and Climate Change - page 322

asymmetries in the zonal wind, meridional component is clearly observed.
The zonal component is more in the western sector compared to the eastern
sector, while the meridional component is more in the eastern sector of the
storm compared to the western sector. The inflow is more with the 9 km
resolution compared to the 27 km resolution.
The predicted accumulated rainfall during the past 24-hour period is present
with 27 and 9 km horizontal resolution of storm Aila in Figs 6(a) and 6(b). The
model predicted rainfall is compared to the TRMM satellite rainfall. The model
over-estimated the accumulated rainfall compared to the TRMM rainfall. The
track positions of the simulated storm Aila with 27 and 9 km horizontal
resolution are shown in Figs 7(a) and 7(b). The model predicted track agrees
well with the IMD observational track.
Structure of the Simulated Cyclone Laila
In the case of cyclone Laila, Fig. 8 shows the model predicted the minimum
sea level pressure of 993 hPa at 00 UTC of 23 May 2010 at the mature stage
with 27 and 9 km horizontal resolution. The maximum sustained wind speed is
35 m/s with 27 and 9 km horizontal resolution. Contours of the sea level pressure
with 27 and 9 km horizontal resolution is shown in the Figs 9(a) and 9 (b). The
Dundee satellite images of the cyclone at different stages have been depicted
in Fig. 10 (a-d). A large convective cloud mass is seen between South Andhra
Pradesh and North Tamilnadu (Fig.10(a)). On 21 May, the system weakened
over the land and the cloud mass moved further Northeast direction (Fig. 10(b)).
The system moved along the coast towards Northeast direction. The satellite
image shows that the system entered the Bay of Bengal on 23 May 2010.
Figures 11(a) and 11(b) show Radius-Height cross-section of zonal wind
(m/s) meridional wind (m/s) and vertical velocity (m/s) of 27 and 9 km
resolution. The wind distribution in the cyclone with 27 km resolution is shown
in Fig 11(a). Zonal wind shows an inflow of 10 m/s extending up to 910 hPa
and outflow is 5 m/s in the western sector of the storm. The meridional wind
shows the maximum wind of 20 m/s extending up to 900 hPa and 15 m/s
extending from 950 to 700 hPa in the western sector of the storm. The vertical
wind shows the ascending motion of 0.3.5 m/s at 150 hPa. The wind distribution
of the cyclone with 9 km resolution is shown in Fig. 11(b). The zonal wind
shows the inflow of 15 m/s extending up to 910 hPa and outflow is 20 m/s in
the western sector of the storm. The meridional wind shows the maximum
wind of 20 m/s extending up to 900 hPa and 15 m/s extending from 950-750
hPa in the western sector of the storm. The vertical wind shows the ascending
motion of 0.7 m/s extending from 200 hPa and 0.4 m/s at 150 hPa.
As in the case of Aila, simulation of the cylone Laila showed asymmetries
in the wind components. The u component is more in the western sector
compared to the eastern sector, while the v component is more in the eastern
sector.