Rainfall Over North India
Western Disturbance has reached to East Afghanistan. Today it will cross Pakistan border and come to North Pakistan. By tomorrow Delhi, Punjab and Haryana likely to get rainfall activity.
One more feature of Western Disturbance is the formation of induced low. It is formed at the south of WD. This induced low shown in picture above likely to give rain to Rajasthan and West Uttar Pradesh.
Heavy Rain Over North Tamilnadu and Andhra Pradesh
A well marked low in Bay of Bengal has intensified into depression. (see the simulation model) As per IMD report this depression over westcentral Bay of Bengal off Andhra Pradesh coast moved North Northeastwards with a speed of 14 kmph during past six hours and lay centered at 1730 hours IST of the 15th November 2017 near Latitude 16.2°N and Longitude ,83.3°E, ,about 170 km south of Visakhapatnam and 380 km south southwest of Gopalpur. The system is very likely to move further northnortheastwards close to north Andhra Pradeshsouth Odisha coasts during next 24 hours maintaining its intensity. Thereafter, it is very likely to continue to move northnortheastwards and weaken gradually.
Due to this North Tamilnadu and Andhra Pradesh likely to get heavy rainfall.