Animation of the weather of spring 2015 from the Met Office Unified Model. The top panel shows 250 hPa wind (corresponding to an altitude of approximately 10km coincident with the Jet Stream), and 850 hPa actual temperature. The bottom panel shows 850 hPa wind and precipitation. The animation runs from 1 March 2015 to 31 May 2015 with a 3 hour time-step. Courtesy David Fereday, Met Office Hadley Centre.