NASA AIRS Time Series of Tropical Storm Songda (IMAGE)
Caption
This series of three infrared images shows the strengthening of Tropical Storm Songda over the period of May 19-22, 2011. Notice that the area with strongest convection (purple) has expanded over that time. That area has the coldest, highest thunderstorm cloud tops near -63 F/-52C, and heaviest rainfall. Over those four days, Songda took on a more rounded shape.
Credit
NASA/JPL, Ed Olsen
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