Meanwhile , a low pressure system known as a monsoon trough develops over South - East Asia and Australasia and winds are directed toward Australia .
The subtropical flow directs northeasterly winds to blow across southern Asia , creating dry air streams which produce clear skies over India .
A low pressure system known as a monsoon trough develops over South - East Asia and Australasia and winds are directed toward Australia .
The subtropical flow directs northeasterly winds to blow across southern Asia , creating dry air streams which produce clear skies over India .