The IMD on Monday stated a deep depression over the Bay of Bengal has strengthened into Cyclone Arnab and is likely to intensify into a very catastrophic cyclonic storm by October 27 before crossing the Andhra Pradesh coast the following morning.

The cyclone lay centred over the eastcentral and adjoining westcentral Bay of Bengal at 5.30 am on Monday, moving westwards at 15 kmph during the preceding six hours, as per the IMD's National Bulletin No. 8.