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Tropical Storm Lee made landfall over New Orleans on Sept. 2-3, 2011, with predicted rainfall of 15 to 20 inches over southern Louisiana. This coincided with a surge in discharge from the Mississippi River around that time. NASA's Aquarius instrument on the Aquarius/SAC-D spacecraft detected a corresponding low-salinty feature. This preliminary finding is likely the result of both the increased river discharge and heavy rainfall from the storm directly on the sea surface. [Source: NASA Jet Propulsion Laboratory]
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