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Thereafter, the rain intensity would further increase and spread to many parts of these states as the Western Disturbance would move along the Tibet region.
Apart from the moisture incursion from Bay of Bengal, the presence of an upper air Cyclonic Circulation over West-central Bay of Bengal is also providing moisture over these two states.
After 18 to 24 hours, southern parts of Assam and Sikkim are likely to receive heavy rainfall activities as the Western Disturbance would start affecting these regions. Later, the rainfall intensity would shift towards eastern parts over to Meghalaya, other parts of Assam, Arunachal Pradesh and Nagaland.
The water level is likely to increase further due to the occurrence of these rains. Already Assam is bearing the brunt of heavy rains in the last few days. Flood-like conditions along the Brahmaputra and its catchment areas would further continue.