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NASA/Goddard Space Flight Center
On Aug. 6, 2019 at 1217 a.m. EDT (0417 UTC). the AIRS instrument aboard NASA's Aqua satellite analyzed cloud top temperatures of Tropical Storm Francisco in infrared light. AIRS found coldest cloud top temperatures (purple) of strongest thunderstorms were as cold as or colder than minus 63 degrees Fahrenheit (minus 53 degrees Celsius).
NASA JPL/Heidar Thrastarson
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