Department of Meteorology expects a slight increase in rain activity across most parts of the island today.Showers or thundershowers may occur at several places across most parts of the island after 1.00 pm, with fairly heavy showers above 50 millimetres likely at some places in Sabaragamuwa, Central, and North-Central provinces, as well as Trincomalee and Mullaitivu districts.Showers may also occur in Western and Southern provinces during the morning.Misty conditions can be expected at some places in Sabaragamuwa, Central, and Uva provinces, and in Kurunegala and Anuradhapura districts during the early morning.