The trough at lower levels from Interior Karnataka to Kerala continues to persist and will shift north to Maharashtra. This trough in conjunction with the Upper Air Circulation (UAC) in the Arabian Sea will continue to give rains to Karnataka, Goa, and Interior Maharashtra and also to the coastal areas of Kerala. Nedumangad (near Trivandrum) in Kerala has recorded a very heavy rainfall of 201 mm under its influence.
On the SE side, the twin UAC’s in the mid troposphere with one end near North Tamil Nadu with the other end in North-Central Bay of Bengal lies as an elongated trough. This, in association with the trough in the lower levels will bring heavy rainfall to north Tamil Nadu and Andhra Pradesh.
Chennai – Typical September day with very high humidity and thus high possibility of rains. Temperature will peak between 34 – 35 C.
Madurai – A cloudy and warm day with mercury ranging below normal at 34-35 C followed by rains later in the day.
Coimbatore – Will have a cloudy day with a chance of light showers. Temperature will settle between 32- 34 C.