VIIRS Instrument Sees Dorian (image) NASA/Goddard Space Flight Center Caption This night-time, infrared image of Tropical Storm Dorian was taken from the VIIRS instrument aboard the Suomi-NPP satellite on July 25 at 03:52 UTC. The red and purple areas are very high thunderstorms. Credit Image Credit: UWI-Madison/NASA-NOAA Usage Restrictions None Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.