NASA is monitoring Tropical Storm Harvey as it moves back into the Gulf of Mexico this morning (Aug. 28) after causing heavy rains and severe flooding across Texas and Louisiana this past weekend.
Harvey initially hit the Texas coast as a Category 4 hurricane on Friday (Aug. 25). NASA's aptly named Aqua satellite — "aqua" is Latin for "water" — has been gathering data that has helped scientists identify the clouds within the tropical storm that are capable of generating heavy rainfall.
On Sunday (Aug. 27), NASA's Johnson Space Center (JSC) in Houston was closed to everyone except mission-critical staff due to the flooding. JSC is home to Mission Control, which is responsible for NASA's operation of the International Space Station. The massive rainfall has flooded many of the roads surrounding JSC. [How to Donate to Harvey Victims Online]
The Aqua spacecraft made readings using one of its instruments, known as the Atmospheric Infrared Sounder (AIRS). The instrument detected the temperature of the clouds in the storm using infrared light, and scientists used that information to find out how large — and therefore how powerful — the storm clouds were in any given area the satellite surveyed, according to a NASA statement.
"The higher the cloud tops, the colder and the stronger they are," officials wrote in the statement. "So, infrared light … gathered by the AIRS instrument can identify the strongest storms within a tropical cyclone."