Amaravati, Oct 22 : The Met Department has forecast thunderstorms with lightning at isolated places in Andhra Pradesh's Rayalaseema on Friday. Rayalaseema comprises the four districts of Kurnool, Anantapur, Kadapa and Chittor in southern Andhra Pradesh. However, the Met Department did not predict any rainfall on Saturday, Sunday and Monday. Meanwhile, the well-marked low pressure area over west central Bay of Bengal and neighbourhood has concentrated into a depression over northwest and adjoining west central region off the east coast. The depression lay at a latitude of 18.7 degrees north and 87 degrees east longitude, about 180 km southeast of Paradip in Odisha, 350 km southeast of Sagar Islands in West Bengal and 490 km southwest of Khepupara in Bangladesh. "It is very likely to intensify further into a deep depression during next 24 hours. It is very likely to move north northeastwards and cross West Bengal and adjoining Bangladesh coast as a deep depression between Sagar Islands and Khepupara on Friday afternoon," said a Met official. /IANS