If someone asks you about UK weather, you can probably say "lousy" with about 75 percent accuracy. But the UK's national weather service, the Met Office, needs a bit more precision than that, so it just purchased a £97 million ($156 million) Cray XC40 supercomputer. With 480,000 CPUs, the 140 tonne (154 ton) machine will run about 13 times faster than its current IBM system. It'll also let the Met provide updates every hour, three times more often than it can now. All that speed will enable forecasts down to a resolution of 1.5km (1 mile), giving UK denizens the weather down to a specific London borough, for instance. It should also provide much better flood and wind warnings, along with more accurate fog, ice and snow reports for airports.