According to NASA:
The image above was produced with data acquired by RapidScat as Ana approached the coast on the afternoon of May 8, 2015. Arrows represent the direction of near-surface winds. Shades of blue indicate the range of wind speeds (lighter blue and green represent faster-moving winds). The image below, acquired with the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Terra satellite, shows a natural-color view of the same storm as it appeared on the morning of May 9.
Hurricane season is just getting started, and we can expect plenty more cool NASA images as things kick into high gear. [NASA Earth Observatory]
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