HEAVY showers and thunderstorms could bring some disruption to Cornwall tomorrow, the Met Office has warned - although some parts of Cornwall have already seen flooding this morning. 

An area of Ponsharden between Penryn and Falmouth is said to have heavy surface water and there are also treacherous driving conditions at the bottom of Arch Hill in Truro and the Norway Inn at Perranarworthal.

The Met Office has warned that tomorrow some places could see as much as 20mm of rain could fall within an hour with possibly 30 to 40mm of rainfall in around three hours.

A yellow weather warning has been issued for Cornwall between 11am and 8pm on Friday.

The warning extends to the whole of the south of England.

The Met Office's warning impact matrix deems the warning to have a medium likelihood and low impact.

This means that there may be some short lived disruption to day-to-day routines in affected areas, while incidents would be dealt with under ‘business as usual’ response by emergency services.

Some transport routes and travel services may be affected with some journeys requiring longer travel times.

In terms of what to expect, the Met Office says:

  • There is a good chance driving conditions will be affected by spray, standing water or hail, leading to longer journey times by car and bus
  • Delays to train services are possible
  • Perhaps damage to a few buildings and structures from lightning strikes
  • Some short term loss of power is possible

A Met Office spokesperson said: “Heavy showers and thunderstorms are expected to develop quite quickly later on Friday morning, but peaking during the afternoon for many, before probably becoming more restricted to the southeast and south coastal counties towards evening.

"Some places will miss the heavier rain, but other locations could see around 20 mm within an hour and perhaps 30 to 40 mm in around 3 hours, sufficient to cause issues on the roads.”