After a month-long break, Formula One makes its comeback this week with the Miami Grand Prix in Florida... or at least, that's what's planned. But race organisers are growing increasingly anxious ahead of the weekend due to heavy rainfall forecasts that could see proceedings halted, in accordance with US law. Some forecasts suggest there is an 80-90% chance of rain on Sunday, but more crucially, a 50-60% chance of thunderstorms occurring through the Miami Gardens area. It's the latter figure