The clerk of the course has announced a one-hour delay to today's racing schedule.
Roads are due to start closing on the Mountain at 10am before the rest of the course closes at 11am.
Today is due to see supersport and suberbike races before roads reopen this afternoon - when the course is fully closed again this evening it'll be time for the first superstock race.
All roads should reopen no later than 10.30pm tonight.
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