Thunderstorms with lightning and gusty surface wind speed reaching 50-60 kmph and rainfall are very likely to occur in several parts of the State on Sunday, said the Regional Office of the Indian Metrological Department (IMD) here on Saturday. The IMD said the wind speed may increase on May 31 which would occur along with rainfall in different districts like Keonjhar, Mayurbhanj, Baleswar, Bhadrak, Jajpur, Cuttack, Dhenkanal, Ganjam, Nayagarh, Khordha, and Kandhamal.