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Hurricane Season 2007: Ingrid (Atlantic)
Ingrid Dissipating East of the Leeward Islands

Satellite image of Ingrid
Click image for enlargement.

Satellite imagery taken early Monday morning, Sept. 17, indicated that tropical depression Ingrid is dissipating.

At 5:00 a.m. EDT (0900z) the center of the dissipating tropical depression was estimated near latitude 17.5 north, longitude 60.0 west, or about 120 miles (195 km) east-northeast of Antigua.

The depression was moving toward the west near 9 mph (15 km/hr). Ingrid's remnants are expected to move slowly to the west-northwest over the next day or two.

Her maximum sustained winds are near 30 mph (45 km/hr) with higher gusts. These winds are expected to diminish over the next day or two. Estimated minimum central pressure is 1010 millibars.

This image from the National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite-12 (GOES-12) shows a very disorganized tropical depression Ingrid just northeast of the Lesser Antilles in the lower right corner. This image was taken on Monday, Sept. 16 at 20:45 UTC (4:45 p.m. EDT). The image was created by NASA's GOES Project, located at NASA's Goddard Space Flight Center, Greenbelt, Md.

Elsewhere, the National Hurricane Center reports that a tropical wave located 950 miles further east of the Lesser Antilles is associated with a large area of showers, however, they remain disorganized. Any development of this system is expected to be slow, as the area of showers continues to move westward at 10 to 15 mph.

Rob Gutro (from NHC Reports)
Goddard Space Flight Center
Image credit: NASA GOES Project

NASA Takes a Side and Top-Down View of Tropical Storm Ingrid

Satellite image of Tropical Storm Ingrid
Click image for higher resolution.

Between NASA's CloudSat and Aqua satellites, scientists can see Tropical Storm Ingrid from the top and the sides.

NASA's CloudSat satellite's Cloud Profiling Radar captured a sideways look across Tropical Storm Ingrid on Thursday, Sept. 13 at 5:00 UTC (1:00 a.m. EDT) churning in the open waters of the Atlantic Ocean.

At 11:00 a.m. EDT Ingrid was located near latitude 15.2 north and longitude 50.0 west or about 755 miles west of the Lesser Antilles. Ingrid was moving toward the west-northwest near 7 mph and is expected to turn toward the northwest. She had a minimum central pressure of 1004 millibars.

Maximum sustained winds are near 45 mph with higher gusts. The National Hurricane Center noted, "Some weakening is expected in the next day or so."

The top image is from the National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite (GOES). The image on the bottom is the vertical cross section of radar reflectivity along this path, basically what Ingrid's clouds looked like sideways. The colors indicate the intensity of the reflected radar energy. The top of Ingrid's clouds reach almost to 14 kilometers, or approximately 8.7 miles high.

The blue areas along the top of the clouds indicates cloud ice, while the wavy blue lines on the bottom center of the image indicate intense rainfall. Notice that the solid line along the bottom of the panel, which is the ground, disappears in this area of intense precipitation. It is likely that in the area the precipitation rate exceeds 30mm/hr (1.18 inches/hour) based on previous studies.

A Look at the Coldest and Highest Cloud Tops

Satellite image of Tropical Storm Ingrid
Click image for higher resolution.

This infrared image from Sept. 14 at 3:59 UTC (11:59 p.m. EDT, Sept. 13), was created by data from the Atmospheric Infrared Sounder (AIRS) instrument on NASA's Aqua satellite.

This AIRS image shows the temperature of the cloud tops or the surface of the Earth in cloud-free regions. The lowest temperatures (in purple) are associated with high, cold cloud tops that make up the top of Ingrid. The infrared signal does not penetrate through clouds. Where there are no clouds the AIRS instrument reads the infrared signal from the surface of the Earth, revealing warmer temperatures (red). This infrared image shows large areas of stronger convection surrounding the core of the storm (in purple). There is no visible eye in this AIRS image, as it would appear as a yellow dot in the center of the blue and purple area.

Rob Gutro
Goddard Space Flight Center
Image credits: NASA/JPL/Colorado State University/Naval Research Laboratory-Monterey; NASA/JPL

Tropical Storm Humberto Named; Tropical Depression Eight Intensifying

Tropical depression eight and nine formed in the Atlantic Ocean and the Gulf of Mexico on Wednesday Sept. 12, 2007. Tropical depression nine, located in the northwestern Gulf of Mexico, was further upgraded to a tropical storm and named Humberto at 2:00 p.m. on Sept. 12, is expected to move slowly northward and affect the Texas and Louisiana coasts.

Humberto Bringing Rains to Texas and Louisiana

Satellite image of Tropical Storm Humberto
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A tropical storm warning remains in effect from Port O'Connor, Texas to Cameron, Louisiana. A tropical storm warning means that tropical storm conditions are expected within the warning area within the next 24 hours.

At 2:00 p.m. EDT Tropical Storm Humberto's center was located near latitude 28.3 north and longitude 95.1 west or about 70 miles south-southwest of Galveston, Texas and about 145 miles east-northeast of Corpus Christi, Texas.

Humberto is moving toward the north near 6 mph and this general motion is expected to continue over the next 24 hours. On the forecast track, the National Hurricane Center reports that the center of Humberto should be crossing the Texas coast within the warning area tonight.

Maximum sustained winds have increased and are now near 45 mph with higher gusts. Some additional strengthening is possible prior to landfall. Estimated minimum central pressure is 1005 millibars.

Rainfall amounts of 5 to 10 inches are expected along the middle and upper Texas coast and in extreme southwestern Louisiana, with isolated maximum accumulations of 15 inches possible.

Tropical Depression Eight in the Mid-Atlantic

Satellite image of TD-8
Click image for enlargement.

Tropical depression eight (TD#8) is far away from land in the Atlantic Ocean east of the Caribbean Sea and is expected to intensify and be named tropical storm Ingrid as it moves toward the west-northwest.

At 11:00 a.m. EDT, TD#8 was located at 13.2 degrees north latitude and 44.6 west longitude. TD#8 is moving west-northwest near 12 mph and has maximum sustained winds near 35 mph. TD#8's minimum central pressure was 1007 millibars. The National Hurricane Center noted in its 11 a.m. EDT advisory "Some strengthening is forecast during the next 24 hours and the depression could become a tropical storm later today or tonight."

The images above were made from data captured by the Tropical Rainfall Measuring Mission (TRMM) satellite and show the horizontal pattern of rain intensity within the storms. The rainfall analysis of forming tropical depression eight was made from data received on Sept. 12 at 0839 UTC (4:39 a.m. EDT) and the image of forming tropical storm HUMBERTO used TRMM data from Sept. 12 at 1004 UTC (6:04 a.m. EDT).

For more information about how TRMM looks at rainfall, visit NASA's TRMM website. TRMM is a joint mission between NASA and the Japanese space agency JAXA.

Steve Lang SSAI / Goddard Space Flight Center
Rob Gutro Goddard Space Flight Center
Images credit: Hal Pierce (SSAI/NASA GSFC)