Tropical Update-05

TROPICAL LOW (INVEST-91B) BACK TO LIFE AS THE CONVECTION DEVELOPS-

Yesterday after seeing the insat picture, many might have thought that the system was dead and the convection around it was lost. The low was formed 2 days back, but suddenly the Convection was Lost. According to World Meteorological Organization this period of loss of convection is called "incubation period". During this period, the humidity increases gradually around the Low pressure area. After some time, this will form the convection. The same thing occurred today.

YESTERDAY HIMAWARI PICTURE-(NO PROPER CONVECTION)

LATEST CONDITIONS PICTURE-(DEVELOPING CONVECTION)

CLOUD-LOWER CONVERGENCE:

INFERENCE:

The convergence of clouds make up a crucial role in building good bands. Now we can observe good cloud build up due to heavy convergence. Its likely to increase and will lead to heavy rainfall along Srilankan Coast.

UPPER LEVEL-DIVERGENCE:

INFERENCE-

Upper level divergence will help in proper spread of clouds and their corresponding rain bands. The system associated with good upper-divergence will lead to heavy rainfall around the centre eye wall. The present system (Invest-91B) has a very good diverging air at upper levels. Soon more convection will wrap up leading to heavy rainfall around the center.

THEORY:

INFERENCE:

So for the proper development of Storm, the "lower-converging nature" and "upper-diverging nature" are essential. If they are good, the cloud band around the storm will develop massively and lead to heavy rainfall.