video: The Global Hawk UAV flies over Hurricane Karl to reveal a hot tower. Red shows reflectivity that is 12 km from the surface, orange is 10 km, yellow is 7.5 km, green is 6 km, and blue is under 6 km.This movie shows the eyewall of the storm develop as the UAV monitors from above.
FULL RELATED STORY: http://www.nasa.gov/content/goddard/nasa-hs3-mission-animations-peer-in-and-outside-of-tropical-cyclones/
Credit: NASA