Motorists crossing the Vasco da Gama Bridge in Lisbon, Portugal, on Thursday afternoon (28 March) witnessed an unusual weather phenomenon which local media said was possibly a tornado or waterspout. Impressive footage shows a whirling column of mist and spray looming over the bridge, which is the second-longest structure in Europe. Waterspouts are similar to tornadoes, but they form over a body of water. Tornadoes are not common in Europe but do occur occasionally in the northwest and south of the continent.