The AIRS instrument onboard NASA's Aqua satellite captured this infrared image System 93L was strengthening into tropical depression 8, and before it became Tropical Storm Gordon. The image was taken on Aug. 15 at 12:53 p.m. EDT, and shows strong bands of thunderstorms (purple) to the north and west of the center of circulation, indicating strengthening. Credit: NASA/JPL, Ed Olsen

NASA has been watching the low pressure system called System 93L for the last week, and late on August 15 it organized into Tropical Depression 8, then Tropical Storm Gordon. NOAA's GOES-13 satellite captured a visible image of tiny Tropical Storm Gordon after sunrise on August 16.

System 93L started out on August 10 as a tropical wave and associated low pressure area, that moved off the African coast into the eastern Atlantic. Over the last six days it moved west across the Atlantic Ocean and had its ups and downs in terms of organization and development. On August 15 at 5 p.m. EDT, it strengthened into the Atlantic Ocean hurricane season's eighth tropical depression, just 15 hours after infrared data from the Atmospheric Infrared Sounder (AIRS) instrument onboard NASA's Aqua satellite identified a strong banding of thunderstorms around the center of circulation and northwest of the center. That banding was an indication of organization and strengthening.

Aqua's AIRS instrument captured another infrared image System 93L as it was strengthening into tropical depression 8, and before it became Tropical Storm Gordon. The image was taken on Aug. 15 at 12:53 p.m. EDT, and showed strong bands of thunderstorms to the north and west of the center of circulation where cloud tops were so high into the atmosphere that they were as cold as -63 Fahrenheit (-52 Celsius). When thunderstorms that make up tropical cyclones reach such heights, they likely contain heavy rainfall, and are indicative of a lot of strength within the cyclone.

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The GOES-13 satellite captured this visible image of newborn Tropical Storm Gordon on Aug. 16 at 1145 UTC (7:45 a.m. EDT). Credit: NASA GOES Project

At 5 a.m. EDT, Tropical Storm Gordon had maximum sustained wind near 40 mph (65 kmh), and some strengthening is expected, according to the National Hurricane Center (NHC). In fact, the NHC noted that Gordon could become a hurricane over the weekend of August 18-19 because the storm is expected to track over warm water and encounter very little wind shear.

The center of Tropical Storm Gordon was located about 585 miles (940 km) east of Bermuda, near latitude 32.2 north and longitude 54.8 west. Gordon is moving toward the north-northeast near 14 mph (22 kmh) and is expected to turn northeast and east, heading back into the north central Atlantic Ocean.

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An animation of satellite observations from Aug. 13-16, 2012 shows the birth of the Atlantic Ocean hurricane season's eighth tropical depression that strengthens into Tropical Storm Gordon. This visualization was created by the NASA GOES Project at NASA Goddard Space Flight Center, Greenbelt, Md., using observations from NOAA's GOES-13 satellite. Credit: NASA/NOAA GOES Project Center

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NASA sees System 93L explode into Tropical Storm Gordon