Why can't F1 race when it's very wet?

Summary by Krater

An explainer on why heavy rain causes delays in Formula 1 racing, covering medical helicopter safety limits, aquaplaning physics, tyre tread designs, and visibility spray.

From the video

Answers: Why does rain cause delays and safety car starts in Formula 1?

• Formula 1 racing in wet weather
• Aquaplaning and hydroplaning physics
• F1 wet and intermediate tyre design
• Medical helicopter weather limits
• Spray and visibility in F1

What it concludes

• Active F1 sessions require a 20-minute window for safe medical helicopter flight to a staffed neurosurgery hospital.
• Standing water on the track causes cars to aquaplane, reducing tire traction and steering control.
• Intermediate and wet tyres use grooves and tread patterns to channel standing water away and maintain tire traction.
• Full wet tyres have a wider diameter that raises the car 5 millimetres higher off the ground.
• Heavy rain spray from chasing cars drastically reduces driver visibility at high speeds.