It used to be that computer models of weather events such as thunderstorms could only be run using powerful - and expensive - supercomputers. Now, however, these kinds of models can be run on the humble laptop. This episode explores this democratisation of weather modelling using the example of a spectacular thunderstorm called 'Hector the Convector'. Dr Chris Chambers produced a computer model of this thunderstorm on his laptop, and shows us how accurate it is by running it side-by-side with a timelapse video of the actual thunderstorm.