Some of this heavy rain has fallen on existing moderate to extreme drought conditions over western Iowa, eastern Nebraska, and South Dakota.
In fact, Monday morning, the Floyd River reached an all-time record crest, 7.2 feet above flood stage, in northwest Iowa near Alton. This river gauge has been keeping records for at least 60 years!
What Drought? Midwest Deluge Continues | Weather Underground
Disrupting the Borg is expensive and time consuming!
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Real Science 
Below 350ppm –
On May 31, 1889 The Johnstown Flood (or Great Flood of 1889 as it became known locally). It was the result of the catastrophic failure of the South Fork Dam situated on the Little Conemaugh River 14 miles (23 km) upstream of the town of Johnstown, Pennsylvania, USA, made worse by several days of extremely heavy rainfall. The flood killed 2,209 people and caused US$17 million of damage (the equivalent of about $425 million in 2012 dollars).
http://en.wikipedia.org/wiki/Johnstown_Flood
I love the term “flash drought” – kinda reminds me of droughtflood.
Reblogged this on Climate Ponderings.