Phillips also announced that this year's tournament, which runs from June 21 to July 4, will be a "World Cup-free zone", with football fans denied the chance to watch matches on the big screens at the All England Club.
They say there is particular concern over the very long-lived northern low pressure zone of circumpolar winds, called a vortex, found at between 13 and 34 km (8 and 21 miles) above the Earth's surface.