Cornwall residents hoping to enjoy uninterrupted sunshine may need to adjust their plans this afternoon. 

Just as the Duchy welcomed back clear skies following Monday's rain showers, the Met Office has issued a yellow weather warning for thunder, lightning, and rain this afternoon.

The Met Office anticipates scattered heavy showers and thunderstorms throughout the afternoon, continuing into the evening.

Rainfall predictions range from 15-20mm within an hour, with some areas potentially experiencing up to 30mm in a few hours.

Lightning strikes are also a potential hazard, with a slight chance of hail in isolated areas.

The good news is that the Met Office expects the thunderstorms to subside by this evening.

However, they've issued safety advice for residents to stay safe before, during, and after the storm.

Staying Safe During Thunderstorms

Before the Storm:

  • Lightning can cause power surges. Unplug non-essential appliances if not already protected by a surge protector.
  • Seek shelter if possible. If you hear thunder, you're already close enough to be struck by lightning, which can travel up to 10 miles from a storm's centre.

During the Storm:

  • Avoid using landline telephones unless for emergencies, as telephone lines can conduct electricity.
  • If you're outdoors, stay away from water and find a low-lying open area at a safe distance from trees, poles, or metal objects.
  • Avoid activities like golf, fishing, or boating on a lake.
  • Be aware of metal objects that conduct electricity, including umbrellas, bikes, and mobility scooters. If you're in a tent, maintain distance from the metal poles.
  • If caught in an exposed location, squat low to the ground with your hands on your knees and head tucked between them. Minimize body contact with the ground.
  • If your hair stands on end, drop into the squatting position immediately.

After the Storm:

  • Avoid downed power lines and broken cables.
  • If someone is struck by lightning, check for a pulse and signs of burns.

Driving During a Thunderstorm:

  • If caught in a storm while driving, pull over, roll up the windows, and stay inside your car.
  • Most cars with metal roofs act as a Faraday cage, protecting passengers from electrical currents.
  • Soft-top convertibles are at higher risk and could catch fire if struck by lightning.
  • Be aware that current can travel through other car parts like GPS and radio systems. Metal components like steering wheels can also conduct electricity.
  • Lightning strikes can damage cars both internally and externally.
  • Thunderstorms can bring strong winds, posing a risk to cyclists, motorcyclists, and high-sided vehicles.
  • Give extra space to vulnerable road users, as they're more likely to be blown around by wind gusts. Reduce your speed to maintain control of your vehicle.