The A30 is blocked westbound due to an accident involving two vehicles between the A38 Launceston Road (Callywith) and the A391 Truro Road (Innis Downs Junction).
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A mix of some showery outbreaks of rain and brighter spells in the west feeling cooler than Wednesday.
Showery outbreaks of rain will become more widespread through today, with heavy and locally thundery downpours possible.
It will be a bright and warm evening but clouds will arrive as midnight approaches.