The Manx Grand Prix racing previously planned for Friday has been brought forward to tomorrow.
The decision has been made by Clerk of the Course, Gary Thompson, as bad weather is forecast for Friday.
As a result, Thursday will see roads on the TT course closed from 11.30am and are expected to re-open at 4.50pm.
The day will see the MGP Light and Ultralightweight race take place from 12.15pm followed by the Senior race at 2.35pm.
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Part of TT course closed tomorrow