In the meantime, fairly heavy rainfall of about 75mm-100mm is likely at some places in Eastern, Uva and North-Western provinces and Matara district.The sea areas extending from Trincomalee to Negombo via Kankesanturai, Mannar and Puttalam and the sea areas extending from Galle to Pottuvil via Hambantota can be fairly rough at times as the wind speed can increase up to 50-55 kmph at times.Temporary strongly, gusty winds up to 70-80 kmph and very rough seas can be expected during thundershowers.