A thoroughly rotten start to the day - and it remains grim for the Isle of Man all day, unbroken spells of rain which will prove heavy and persistent. 20-40mm rainfall possible in 12 hours in places. 50mm possible in isolated spots. Everywhere except the Isle of Man brightens up on Saturday afternoon from the south and we expect a bright end to the day. Breezy, with temperatures 16-18c at best, 61-64f. Sunday shows an improving trend.