Paris - Heavy snowfall in the French Alps left some 15 000 drivers stranded on Saturday, prompting officials to open emergency shelters and urge travellers to stay home.The snow and ice hit as a rush of holidaymakers were heading to and leaving from ski resorts in the Savoie region in southeastern France, where authorities set up shelters in at least 12 towns.The snow and freezing rain also caused the death of a 27-year-old man whose car slid into a ravine in the Belledonne mountain range.France's Interior Minister Bernard Cazeneuve in a statement urged drivers "to exercise the utmost caution" and asked those who could delay their trips to do so.The country declared an orange weather alert - one step under the maximum red alert - in 19 regional departments.Conditions 'hellish'France's meteorological services said they expected more snowfall and "significant re-freezing" on Saturday night and warned of slippery roads.Elsewhere in France, it was wind and not snow that wrought havoc for holiday travellers. Storms packing gusts of up to 160 km p/h forced the temporary closure of France's port of Calais on the English Channel and the suspension of car ferries to and from Britain. A few kilometres outside the industrial northern city, thousands of illegal migrants living in makeshift camps struggled through a second night of freezing temperatures."The conditions outside are hellish in the 'jungles'," said David Lacour, the director of Solid'R, which is running a care centre to help migrants survive the cold. "The storm blew away a lot of tents - some now have nothing."1000's of migrantsMattresses line the floor of the old warehouse, once used to store flowers now filled with groups of migrants, some playing cards, some sleeping, some trying to dry their soaked shoes and socks after walking for more than an hour to get here.Up to 2 300 migrants are thought to be in Calais and surrounding areas, where they live in flimsy tents waiting for a change to complete their final journey to Britain. "This is a good shelter here, people help us a lot. It is difficult to survive in the 'jungle'," 23-year-old Eritrean Petrus said.Strong winds also forced the closure of the gardens of the famed château of Versailles near Paris. Snow caused disruption in Britain too, leading to power shortages in more than 100 000 homes and delays at airports.The heaviest snow was in Leek, western central England, where 11 cm fell.Flights to European destinations took off with delays from Manchester Airport, the third-biggest in Britain.Forecasters predict that temperatures in Britain could drop as low as minus 10°C next week.