12 May '11, 6am

You look up and see this thing heading your way: a shelf cloud...should you be worried? via @NASA_EO #nasa

You look up and see this thing heading your way: a shelf cloud...should you be worried? via @NASA_EO #nasa

In early May 2011, more rain fell in one day in parts of Namibia and South Africa than typically falls in an entire year. For several months, unusually heavy and persistent rains have soaked southern and western Africa and filled a few river basins that have been quiescent for years. The latest storm moistened arid desert regions. The map above depicts rainfall for Namibia and South Africa on May 5, 2011. The estimates were made from the Multi-satellite Precipitation Analysis, based on data from the Tropical Rainfall Measuring Mission (TRMM). Shown in shades of green and blue, rainfall estimates range from 20 millimeters (0.8 inches) to greater than 70 millimeters (2.8 inches). In much of the Namib desert near the coast, less than 20 millimeters of rain fall in a year. The photo depicts what is likely a “shelf cloud” associated with a high precipitation supercell thunderst...

Full article: http://earthobservatory.nasa.gov/IOTD/view.php?id=50573

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