NASA measures heavy US rainfall from space
May 22, 2018, NASA's Goddard Space Flight Center
For close to two weeks the combination of a nearly stationary front and tropical moisture caused almost continuous precipitation over much of the Mid-Atlantic. Using data from a constellation of satellites, NASA calculated the extreme rainfall that occurred in parts of the U.S.
Record amounts of rain fell over the eastern United States with over a foot of rain reported in some parts of the Mid-Atlantic. The excessive rain led to flooding along several rivers including Washington D.C.'s Potomac River.
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https://phys.org/news/2018-05-nasa-heavy-rainfall-space.html#jCp