New Delhi, Oct. 5 -- The severe cyclonic storm Shakhti, currently over northeast Arabian Sea, is likely to move west-southwestwards and reach northwest and adjoining west central Arabian Sea by Sunday. Thereafter, it will recurve and move east-northeastwards, towards the Indian coast, from morning of October Monday and weaken gradually, the India Meteorological Department (IMD) has said. Shakhti had formed from a remnant of low pressure area over Bay of Bengal near the North Andhra Pradesh coast on October 1. "Thereafter, it intensified in to a depression, crossed the entire country. Moved up to Gujarat as a low pressure area and emerged into northeast Arabian Sea and intensified into a depression and further into a cyclone and severe cyclone," said M Mohapatra, director general, IMD. "Presently it's moving away from the coast. But, after October 5, it is expected to recurve towards the Indian coast. It will, however, weaken over the sea." On Saturday, the cyclone with wind speed of 100-120kmph gusting to 135kmph lay about 470km west of Dwarka, 470km west-southwest of Naliya, 420 km southwest of Karachi (Pakistan) and 600km east-northeast of Masirah ( Oman). The cyclone -- presently moving away from the coast and is expected to intensify to a severe cyclone -- may turn again towards land, but it is expected to weaken by then, a senior IMD scientist said. Meanwhile, rains lashed parts of Uttar Pradesh and Bihar, with heavy showers disrupting rail traffic in UP's Ballia district. GRP station in-charge Vivekanand Yadav said that due to the rainfall, a tree fell on the railway line between Sahatwar and Bansdih stations, as well as between Revati and Dal Chhapra. The rail traffic was restored after the fallen tree was removed. The railway tracks between Bakulha and Manjhi railway stations and in Dal Chhapra were also affected due to soil erosion. IMD, on Saturday, said a fresh intense western disturbance is likely to cause heavy rainfall & hailstorm over Northwest India during October 5-7 with peak intensity on Monday. The weather department also said a well-marked low-pressure area will bring heavy to very heavy rainfall in sub-Himalayan West Bengal till Monday morning. Issuing a red warning for the sub-Himalayan districts of Darjeeling, Kalimpong, Cooch Behar, Jalpaiguri and Alipurduar, it said one or two places in these districts are likely to receive extremely heavy rain till Sunday morning, which will continue till Monday morning in Alipurduar....