The southeasterly winds originating in the Bay of Bengal and the southwesterly winds emerging in the Arabian Sea would first penetrate the east and west coast respectively and then collide over north Tamil Nadu, southeast Karnataka and south Andhra Pradesh. This scenario will bring showers into a region where dry weather is prevailing for quite some time this season. Rain would be light to moderate and expected in the initial evening hours. This phase of rain would last for two days.
However, the western end of the monsoon trough continues to make its presence felt on the northwest plains. The region is expected to stay with moderate showers during the next twenty four hours. Northwest Rajasthan, north Haryana, Chandigarh and Punjab would receive showers during next one or two days. Monsoon trough is essentially a region of intensified monsoon winds. The trough is passing through Ganganagar, Narnual, Budaun, Kanpur, Balia, and Berhampore thence eastwards to east Assam.
The western end is likely to shift north of its normal position during the next forty eight hours. This will increase the intensity of the rain over Jammu & Kashmir, Himachal Pradesh and Uttarakhand. Heavy to very showers at one or two places over these areas are possible during this period.
The central part part of the monsoon trough in coordination with the low pressure over west Uttar Pradesh, northeast Rajasthan and south Haryana would garner rain over these areas during the next twenty four hours. Showers could be heavy at one or two places over the region especially over east Rajasthan.
The eastern part of the monsoon trough would produce rain over northeast Uttar Pradesh, Bihar, north West Bengal, Sikkim and northeastern states. Rain over these areas will last for next twenty four to forty hours. The trough is getting moisture from the southeasterly winds from the Bay of Bengal.
Rain would be subdued over central parts of the Peninsula over Vidarbha, Telangana, south Chhattisgarh and interior Orissa for now.
Along the west coast, the offshore trough is weak and extending from Maharashtra to Kerala coast. Light to moderate rain will continue over the entire coast except Kerala and Karnataka coast as rain is likely to reduce during the next twenty four hours.