What is DANA, the weather system that brought Spain a year's worth of rain in one day and its worst natural disaster in modern history?

Flash floods in Spain this week have turned village streets into rivers, ruined homes, disrupted transportation and killed at least 95 people in the worst natural disaster to hit the European nation in recent memory. Spain's flash floods were caused by a destructive weather system in which cold and warm air meet and produce powerful rain clouds, a pattern believed to be becoming more prevalent due to climate change. This week's DANA was one of the three most intense such storms in the last century in the Valencia region, Ruben del Campo, spokesperson for the national weather agency Aemet, said. The UN Environment Programme describes the Mediterranean as "a climate change hotspot where vulnerabilities are exacerbated", with the basin warming 20 per cent faster than the global average.