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Hurricane Season 2011: Tropical Depression 10 (Atlantic Ocean)
08.26.11
 
NASA's Aqua satellite passed over Tropical Depression 10's remnants on August 27 at 12:29 a.m. EDT. › View larger image
When NASA's Aqua satellite passed over Tropical Depression 10's remnants on August 27 at 12:29 a.m. EDT, the AIRS instrument captured on a small area of strong thunderstorms (purple) remaining in its remnant circulation.
Credit: NASA/JPL, Ed Olsen
Infrared NASA Satellite Image Sees Tropical Depression 10 Dissipate in Eastern Atlantic

The tenth tropical depression of the Atlantic Ocean season dissipated on Friday, August 26 in the far eastern Atlantic. The depression appeared as a small area of strong thunderstorms on infrared imagery from NASA's Aqua satellite on August 27.

At 11 p.m. EDT, on August 26, 2011, Tropical Depression 10 (TD10) was dissipating about 645 miles west of the southernmost Cape Verde Islands, near 16.0 North and 34.0 West. Its maximum sustained winds were near 30 mph at the time, and it was moving to the north-northwest near 7 mph into cooler waters.

When NASA's Aqua satellite passed overhead on August 27 at 12:29 a.m. EDT, the Atmospheric Infrared Sounder (AIRS) instrument captured on a small area of strong thunderstorms remaining in its remnant circulation, where thunderstorm cloud tops were as cold as -63 Fahrenheit (-52 Celsius).

Text Credit: Rob Gutro, NASA Goddard Space Flight Center, Greenbelt, Md.



August 26, 2011

The GOES-13 satellite saw Tropical Depression 10 far in the eastern Atlantic on August 26, 2011 at 1045 a.m. EDT. › View larger image
The GOES-13 satellite Tropical Depression 10 far in the eastern Atlantic on August 26, 2011 at 1045 a.m. EDT. The western African coast is visible to the right.
Credit: NASA/NOAA GOES Project
NOAA's GOES-13 satellite Sees 10th Atlantic Tropical Depression Struggling

The tenth Tropical depression of the Atlantic Ocean season is struggling in the eastern part of that ocean basin, and the GOES-13 satellite revealed that it didn't change much in the last 24 hours.

The Geostationary Operational Environmental Satellite called GOES-13 is operated by NOAA. GOES-13 images and animations are created at NASA's GOES Project at the NASA Goddard Space Flight Center, Greenbelt, Md. and in a visible image on Friday, August 26 at 10:45 a.m. EDT, Tropical Depression 10 appears no more organized than it was the day before.

At 11 a.m. EDT on August 26, TD10's maximum sustained winds were near 35 mph and little change is expected over the weekend. It is located near latitude 14.9 north and longitude 34.2 west, about 655 miles west of the southernmost Cape Verde Islands. The center of TD10 appears to be elongated from northeast to southwest and convection, rising air that forms thunderstorms that power a tropical cyclone, is declining.

The depression is moving toward the northwest near 8 mph and it is expected to continue in that direction over the next couple of days. TD10 is also moving over cooler waters, which will sap some of its energy. The National Hurricane Center noted that the depression could degenerate into a trough of low pressure later today.

Text Credit: Rob Gutro, NASA Goddard Space Flight Center, Greenbelt, Md.



August 25, 2011

GOES-13 saw Hurricane Irene moving through the Bahamas (left) and newly born Tropical Depression 10 (far right). › View larger image
The GOES-13 satellite saw Hurricane Irene moving through the Bahamas on August 25, 2011 at 1402 UTC (10:02 a.m. EDT) and far to the east was newly born Tropical Depression 10 (far left). Irene dwarfs Tropical Depression 10, and Irene is about 1/3rd the size of the entire U.S. East coast.
Credit: NASA/NOAA GOES Project
NASA Satellites See Hurricane Irene Dwarf Newborn Tropical Depression 10

Hurricane Irene is a major hurricane, and NASA satellite data shows its diameter is now about one-third the length of the U.S. Atlantic coastline. Meanwhile, far in the eastern Atlantic Ocean a tenth tropical depression formed. One satellite image captured both storms and shows the tremendous difference in their size.

NOAA's GOES-13 satellite saw Hurricane Irene moving through the Bahamas on August 25, 2011 at 10:02 a.m. EDT and far to the east off the African coast was newly born Tropical Depression 10. The GOES-13 image shows Irene to be almost one third of the size of the U.S. east coast. The distance from Augusta, Maine to Miami, Florida is 1662.55 miles. Hurricane Irene's tropical storm-force winds extend 255 miles from the center making Irene 510 miles in diameter, almost one-third the size of the U.S. Hurricane-force winds extend 70 miles from the center, or 140 miles in diameter.

GOES-13 images and animations are created at NASA's GOES Project at the NASA Goddard Space Flight Center, Greenbelt, Md.

NASA satellites are providing valuable data to forecasters to assist them in the forecasts for Irene's track and power. As of this morning, a Hurricane Watch is now in effect for the coastal U.S.

On Thursday morning, August 24, a hurricane warning is in effect for the central and northwestern Bahamas. The National Hurricane Center (NHC) has also issued the first watch for the U.S. east coast. A hurricane watch is in effect for north of Surf City, North Carolina to the North Carolina-Virginia border including the Pamlico, Albemarle, and Currituck Sounds. A tropical storm watch is in effect for north of Edisto Beach, South Carolina to Surf City North Carolina.

NASA satellites are flying above Hurricane Irene, providing forecasters at NHC with temperature, pressure, wind, and cloud and sea surface temperature data. All of those things are critical in helping forecasters determine how Irene will behave and track.

The Moderate Resolution Imaging Spectroradiometer (MODIS) Instrument aboard NASA's Terra satellite captured a visible image of Hurricane Irene's eye directly over Crooked Island in the southern Bahamas on August 24, 2011 at 18:15 UTC (2:15 p.m. EDT).

By 11 a.m. EDT on August 25, Irene had moved north and was 75 miles (105 km) east-northeast of Nassau near 25.9 North latitude and 76.8 West longitude. Irene's winds dropped slightly from 120 mph (195 kmh) to 115 mph (kmh) and it was moving to the north-northwest near 13 mph (20 kmh). The NHC, however, noted that some further strengthening is possible today and tonight.

Irene's minimum central pressure has fallen from 954 to 951 millibars since the day before, indicating the storm is still intensifying despite the slight temporary drop in maximum sustained winds.

Hurricane-force wind gusts were already reaching Nassau at 8 a.m. EDT. Hurricane force winds are spreading over the northwestern Bahamas this morning and the central Bahamas are still being battered by hurricane or tropical storm force winds, which will diminish later today as Irene moves away.

Residents in South Florida are also under warnings for dangerous rip currents and high surf along the eastern shores through Friday, August 26. A tropical storm warning in effect for the offshore marine waters of Palm Beach County, Florida beyond 20 nautical miles, and at 5:30 a.m. EDT this morning, rainbands spreading west over the adjacent Atlantic waters. Numerous showers and thunderstorms are expected along the south Florida coast today and tonight.

Far in the eastern Atlantic, Tropical Depression 10 formed about 435 miles (700 km) west-southwest of the southernmost Cape Verde Islands. It was centered near 12.4 North and 30.4 West, and moving to the west-northwest near 13 mph (20 kmh). Tropical Depression 10 (TD10) has maximum sustained winds near 35 mph (55 kmh) and may become a tropical storm in the next day or two. It is not expected to be a threat to the U.S. and is expected to remain at sea.

In the meantime, evacuation plans are already under way in North Carolina for the massive Hurricane Irene.

Updates on Irene's strength and forecast track can be found at the National Hurricane Center's website: www.nhc.noaa.gov. Follow NASA's Hurricane coverage on Facebook and Twitter and at the NASA Hurricane Web page: www.nasa.gov/hurricane.

Text Credit: Rob Gutro, NASA Goddard Space Flight Center, Greenbelt, Md.