21 Aug '12, 10am

here's what the dried-up mississippi looks like from space

here's what the dried-up mississippi looks like from space

View Image Comparison View Both Images In the spring of 2011, the Mississippi River swelled to historic levels, rising out of its banks, rolling across a wide flood plain, and eating at flood barriers. The story in 2012 could not be more different: the river has reached record-low levels in places. The contrast is illustrated in these two images, which show a stretch of the river just south of Memphis, Tennessee. Landsat 7 captured the top image on August 8, 2012, while Landsat 5 took the lower image on August 14, 2011. (The images are rotated so that north is to the left.) In the August 2011 image, the river was three months removed from the peak of the floods, and close to its normal level for the month. In August 2012, the river was several feet below the river stage for Memphis, and many sandbars were newly exposed or greatly expanded. On August 17, 2012, water levels ...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=78903

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