There have been a string of extreme rain and snow falls this year. This was predicted decades ago by climate scientists, due to global warming. Of course, we cannot know that a specific event was due to GW, but we know that it is contributing. Warm air can hold more moisture. When it meets cooler air, there will be increased precipitation.
http://www.msnbc.msn.com/id/38656393/ns/weather/
A 16-year-old girl died Wednesday when raging floodwaters swept three cars off a road near Des Moines, and hundreds had to evacuate their homes as widespread flooding struck Iowa after three nights of rain.
In Ames, flooding contributed to a water main break that forced the city to shut off water to its roughly 55,000 residents and left Iowa State University's basketball arena under 4 to 5 feet of water.
Rivers and creeks rose after storms dumped 2 to 4 inches of rain on central and eastern Iowa over night Wednesday, with 6 inches in some spots, the National Weather Service said. A snowy winter and wet spring and summer "set the stage" for the flooding, but the recent storms were the big problem, weather service meteorologist Jim Lee said.
"The bulk of this has been caused by those recent extreme rainfalls, especially back-to-back-to-back," he said.
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