Rainfall is likely to occur at many places over coastal Andhra Pradesh.
Vardah, which was in southeast Bay of Bengal, has further intensified and is 880 kms southeast of Nellore and it will move northwest, it said.
The system is now moving at a speed of less than 5 kmph and is expected to intensify into a severe cyclonic storm by Friday midnight or the early hours of Saturday.
"The system is very likely to intensify further into a severe cyclonic storm during the next 24 hours and move almost northwards, then west-northwest wards and is expected to cross Andhra Pradesh coast between Nellore and Kakinada by the afternoon of December 12", a CWC official said.
"It is very likely to intensify into a deep depression during the next 24 hours and into a cyclonic storm in subsequent 24 hours", he said.
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The fresh water disturbance created by the system is likely to affect Western Himalayan region starting December 9, the report added. It is also likely to cross south Andhra Pradesh coast between Nellore and Machilipatnam around afternoon or evening of December 12, 2016.
According to Skymetweather, wind speed of up to 130 kmph is expected, along with heavy rainfall, once the cyclone makes landfall.
Squally winds speed reaching 40-50 kmph gusting to 60 kmph would prevail along and off Andhra Pradesh coast commencing from 11th December night.
Andhra Pradesh Chief Minister N Chandrababu Naidu today said that four IAS officers and four NDRF teams were being deployed to the cyclone Vardha prone districts to monitor the situation.Talking to the media after a review meeting with ISRO officials, he said the officials should adopt scientific approach and try to use the rainfall during cyclones to increase ground water level with well preparedness in advance.
The sea would be rough to very rough along and off the coast and fishermen have been advised not to venture into the sea and those who already in the sea have been asked to return to the coast. He also asked officials to ensure sufficient stocks of essential commodities for undertaking relief operations.