Racing around the Mountain Course is now resuming.
The combined Supertwin/Lightweight will be run over two laps, followed by a reduced, three-lap Senior at 3.15pm.
The former had started just after midday after a number of delays, but was red flagged about 12.50pm, with the leaders on their second lap, because of the drizzly, misty weather.
James Cowton had built up a considerable lead when the flags came out, but is out of the resumed racing after bike problems.
Schools returning for new academic year
Police issue advice for road users ahead of the back-to-school rush
Garff Commissioners says windfarm process has been 'almost impossible' responsibility
It comes as the local authority submits its final response to the examination panel
Chairman 'really proud' of MGP Supporters Club legacy
Charity winding down operations after 51 years
Election-themed music show to raise funds for four local charities
Shows to include well-known songs with reworked lyrics