The weak circulation over the Bay is currently SW of Chennai. The position of the circulation has created a temporary wind movement from NNE for Chennai.
Thanks to this circulation there is a faint possibility of some isolated showers along the coastal areas in North Tamil Nadu, from slightly North of Chennai up to Pondicherry. Though it is not going to be wide spread one or two places could receive a decent spell of rains. This spell is expected happen around afternoon.
Late evening Interior Tamil Nadu especially in the Northern part adjoining Rayalseema region could receive some isolated heavy rains.