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TD2 (Atlantic Ocean)
July 23, 2014

[image-94]Satellite Shows Atlantic Tropical Depression Degenerate

NOAA's GOES-East satellite captured imagery of the Atlantic Ocean's Tropical Depression 2 is it degenerated into a tropical wave on July 23.

At 1445 UTC (10:45 a.m. EDT), NOAA's GOES-East satellite captured an image of what was once Tropical Depression 2 (TD2), about 400 miles east of the Lesser Antilles. The GOES-East visible satellite imagery indicated that the depression weakened since July 22. TD2 appeared as just a weak swirl of clouds with no strong thunderstorms or deep convection. The GOES image was created by NASA/NOAA's GOES Project at NASA's Goddard Space Flight Center in Greenbelt, Maryland. 

In addition, the NHC noted that low-level cloud motions showed no evidence of a closed surface circulation and declared TD2 a remnant low pressure area.

At 11 a.m. EDT (1500 UTC), the National Hurricane Center (NHC) issued their final advisory on TD2, and cited that it had degenerated into a tropical wave. Despite that, the remnants of the depression are expected to move through the Lesser Antilles this evening (July 23) with some areas of gusty winds and showers, according to the NHC.

The last NHC advisory placed the center of the degenerated depression's center near 14.0 north latitude and 56.0 west longitude, about 365 miles (590 km) east-southeast of the Lesser Antilles. It was moving quickly to the west at 25 mph (41 kph) and had maximum sustained winds near 35 mph (55 kph) what were quickly waning. TD2's minimum central pressure was near 1012 millibars.

Text credit:  Rob Gutro
NASA's Goddard Space Flight Center


[image-51][image-78]July 22, 2014 - NASA's Aqua Satellite Gets Infrared Hint on Tropical Depression 2

Infrared data gathered on the tropical low pressure area known as System 92L gave forecasters a hint that the low would become the Atlantic Ocean hurricane season's second tropical depression.

NASA's Aqua satellite passed over System 92L on July 21 at 11:53 a.m. EDT and the Atmospheric Infrared Sounder (AIRS) instrument gathered infrared data on the developing low pressure area. The infrared data shows temperature, and AIRS data showed some areas of very cold cloud top temperatures, exceeding the threshold of -63F/-52C that indicates cloud tops near the top of the troposphere. Those cloud top temperatures are also indicative of strong uplift (of air) and powerful thunderstorms. Soon after the AIRS data was taken the low that became Tropical Depression 2.

At 11 a.m. EDT (1500 UTC) on July 222, the center of Tropical Depression Two (TD2) was located near latitude 12.6 north and longitude 48.0 west, about 910 miles (1,465 km) east of the Lesser Antilles. Tropical Depression Two had maximum sustained winds near 35 mph (55 kph) but the National Hurricane Center (NHC) expects little change in strength over the next 24 hours. The depression is moving toward the west near 17 mph (28 kph) and that general motion is expected to continue for the next couple of days. The estimated minimum central pressure is 1012 millibars.

The NHC noted that Tropical Depression 2 will be moving through an environment of dry air and increasing vertical wind shear that will not favor strengthening. In fact, NHC forecasters expect that TD2 may weaken to a remnant low by Wednesday, July 23, and degenerate into a trough (elongated area) of low pressure on Thursday.

Text credit:  Rob Gutro
NASA's Goddard Space Flight Center

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AIRS image of TD2
This false-colored infrared image on July 21 at 11:53 a.m. EDT from NASA's Aqua satellite shows some high, cold (purple) thunderstorm cloud tops in the low that became Tropical Depression 2.
Image Credit: 
NASA JPL, Ed Olsen
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GOES Image of TD2
This visible image of Tropical Depression 2 was taken from NOAA's GOES-East satellite on July 22 at 1145 UTC (7:45 a.m. EDT).
Image Credit: 
NASA/NOAA GOES Project
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Remnants of TD2
TD2 appeared as just a weak swirl of clouds with no strong thunderstorms or deep convection.
Image Credit: 
NASA/NOAA GOES Project
Image Token: 
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Page Last Updated: July 23rd, 2014
Page Editor: Lynn Jenner