A strange weather phenomenon known as a DANA has caused catastrophic flash flooding in Valencia, Spain, this week. More than 155 people have died and dozens remain missing in what meteorologists are calling one of the worst natural disasters in recent memory.
On Tuesday (Oct. 29), some areas received the equivalent of a year's worth of rainfall in just a few hours, triggering massive floods that devastated entire towns and left thousands of people stranded. In some areas, rainfall reached up to 20 inches of rainfall (500 liters per square meter).
