The Department of Meteorology says mainly fair weather is expected to prevail over the island today (Jan.16).Misty conditions are likely in parts of the Western, Sabaragamuwa, Central, Uva, North Western, Southern and North-central provinces in the morning.Ground frost is possible at some places in Nuwara-Eliya District during the early hours of the morning.Sea areas:Mainly fair weather will prevail in the sea areas around the island as well.Winds will be north-easterly and wind speed will be 20-30 kmph.Wind speed may increase up to 45 kmph at times in the sea areas off the coasts extending from Colombo to Mannar via Puttalam and from Pottuvil to Matara via Hambantota.The sea areas off the coasts extending from Colombo to Mannar via Puttalam and from Pottuvil to Matara via Hambantota can be fairly rough at times.