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Hurricane Season 2008: Omar (Atlantic Ocean)
 
Oct. 20, 2008

Omar's Remnants Dissipating in the Atlantic Ocean

Satellite image of Omar Image Credit: NASA/SSAI, Hal Pierce
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The National Hurricane Center issued their last advisory on Saturday, October 18th, on what was once Hurricane Omar. Omar's remnants are dissipating today, Oct. 20, in the open waters of the Atlantic Ocean.

On Oct. 18 at 11:00 a.m. EDT, Omar had degenerated into a remnant low pressure area about 820 miles east of Bermuda. Omar's remnants at that time were located near 33.4 north and 50.7 west. Omar was moving northeast and continued in that direction over this past weekend. Omar had sustained winds near 40 mph at that time, but his thunderstorm activity had diminished so much, that the storm couldn't be considered a tropical cyclone anymore.

The National Hurricane Center said that Omar's remnants were likely going to continue moving in a northeast direction, then east-northeast by a low level flow ahead of a cold front. Omar's remnants are expected to dissipate today, Oct. 20 in the Atlantic's open waters.

NASA's TRMM Satellite Analyzed Omar's Diminished Rainfall

The image above was made from data captured by the Tropical Rainfall Measuring Mission (TRMM) satellite on October 17 at 19:17 Zulu Time (3:17 p.m. EDT) as it passed over Omar from space. This TRMM image shows the horizontal pattern of rain intensity within Omar. The center is located near the yellow, green and red areas, which indicate rainfall between 20 and 40 millimeters (.78 to 1.57 inches) per hour. The tiny areas of red are considered moderate rainfall.

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



Oct. 16, 2008

Omar Weakening and Moving Toward Open Atlantic

Tropical Depression 16 on October 16, 2008
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Credit: Hal Pierce, SSAI/NASA
Hurricane Omar was weakening and moving away from the Northern Leeward Islands on Thursday, Oct. 16 at 11:00 a.m. EDT, and is headed into the open waters of the central Atlantic Ocean over the next several days.

Omar's maximum sustained winds were near 85 mph and he is expected to weaken over Oct. 17 and 18. At 11 a.m. on Oct. 16, Omar was about 180 miles northeast of the northern Leeward Islands, near latitude 20.2 north and longitude 61.3 west. Omar is speeding northeast near 23 mph and this general motion is expected during the next two days. Estimated minimum central pressure is 980 millibars.

NASA's TRMM Satellite Totals Omar's Rainfall from Space

The image above was made from data captured by the Tropical Rainfall Measuring Mission (TRMM) satellite on Oct. 15 at 14:32 Zulu Time or 10:32 a.m. as it passed overhead in space. This TRMM image shows the horizontal pattern of rain intensity within Omar. The center is located near the yellow, green and red areas, which indicate rainfall between 20 and 40 millimeters (.78 to 1.57 inches) per hour. The red area is considered moderate rainfall.

On Oct. 16, the threat of heavy rainfall still exists for northern and central Lesser Antilles as Omar pulls away. Omar is expected to produce additional rainfall amounts of 1 to 3 inches with maximum amounts up to 6 inches over portions of the northern and central Lesser Antilles from Antigua southward to Martinique. During the early morning hours of Oct. 16, Omar passed between St. Martin and the Virgin Islands, and its rains created flooding and mudslides in the U.S. Virgin Islands. Trees were also downed from the winds and heavy rains there.

Omar is forecast to stay far to the east of Bermuda and head back out in to the open waters of the central Atlantic.

For more information about how TRMM looks at rainfall, visit NASA's TRMM website at: http://trmm.gsfc.nasa.gov/. TRMM is a joint mission between NASA and the Japanese space agency JAXA. Text credit: Rob Gutro/Goddard Space Flight Center


Oct. 15, 2008

Omar Becomes Atlantic Hurricane, Could Strengthen to Category 2

Satellite image of Omar Credit: NASA/SSAI, Hal Pierce
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Tropical Storm Omar strengthened into a hurricane by 11 p.m. EDT on Tuesday, October 14, and by the 15th, was on its way to strengthening to a Category 2 hurricane, according to the National Hurricane Center. Omar is threatening many islands in the Caribbean.

Hurricane Omar had sustained winds near 80 mph with higher gusts at 8:00 a.m. EDT on Oct. 15. Strengthening is expected, and Omar could be a category 2 hurricane by the time it reaches the northern Leeward Islands. Omar's center was located about 265 miles southwest of St. Croix, and 265 miles south-southwest of San Juan, Puerto Rico. That's near 14.9 degrees north and 67.5 degrees west.

Omar is moving toward the northeast near 7 mph and is expected to continue over the next day or two, taking Omar through the Northern Leeward Islands tonight and early Thursday. The minimum central pressure estimated from air force Hurricane hunter aircraft observations is 984 millibars.

NASA's TRMM Satellite Analyzes Omar's Intense Rainfall

The image above was made from data captured by the Tropical Rainfall Measuring Mission (TRMM) satellite on October 13 at 8:36 p.m. EDT as it passed over Omar from space. This TRMM image shows the horizontal pattern of rain intensity within Omar. The center is located near the yellow, green and red areas, which indicate rainfall between 20 and 40 millimeters (.78 to 1.57 inches) per hour. The red area is considered moderate rainfall.

TRMM data will be used to investigate Omar's rainfall, as the National Hurricane Center expects total rainfall amounts of 4 to 8 inches over portions of the Netherlands Antilles with maximum amounts of 12 inches possible. Rainfall amounts of 2 to 4 inches with maximum amounts of 6 inches are possible across extreme northwestern and North-central Venezuela and the northern Guajira peninsula. Total rainfall amounts of 5 to 10 inches with maximum amounts up to 20 inches will be possible across Puerto Rico and the northern Leeward Islands. These rains could produce life-threatening flash floods and mud slides.

Coastal storm surge flooding of 1 to 2 feet above normal tide levels, along with large and dangerous battering waves can be expected near and to the right of the path of Omar. In addition Omar is expected to produce large swells that will affect the west-and south-facing coasts of Puerto Rico and the islands of the Lesser Antilles. These swells could cause beach erosion and damage to coastal structures.

Hurricane and Tropical Storm Warnings and Watches are Abundant

There are a lot of hurricane warnings posted as Omar makes his way through the eastern Caribbean. A hurricane warning is in effect for the U.S. Virgin Islands and the Islands of Vieques and Culebra. A hurricane warning is also in effect for St. Martin/Marten, Saba, St. Eustatius, St. Barthelemy, the British Virgin Islands, Anguilla, St. Kitts and Nevis. A hurricane warning means that hurricane conditions are expected within the warning area within the next 24 hours.

A tropical storm warning is in effect for Antigua, Barbuda and Montserrat. A tropical storm warning means that tropical storm conditions are expected within the warning area within the next 24 hours.

A hurricane watch and a tropical storm warning also remain in effect for Puerto Rico. A hurricane watch means that hurricane conditions are possible within the watch area generally within 36 hours. A hurricane warning could be required for Puerto Rico later today.

The Extent of the Strong Winds

Hurricane-force winds in Omar only extend outward to 15 miles from the center. Tropical storm force winds (up to 73 mph) have a much wider reach, out to 105 miles from the center.

For more information about how TRMM looks at rainfall, visit NASA's TRMM website at http://trmm.gsfc.nasa.gov/. TRMM is a joint mission between NASA and the Japanese space agency JAXA.

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



Oct. 14, 2008

Tropical Storm Omar and Tropical Depression 16 Form Near Each Other

Satellite image of Omar Credit: NASA/NOAA GOES Project
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Tropical Storm Omar, the 15th tropical depression of the Atlantic Hurricane Season is drenching the Netherlands Antilles Islands in the Caribbean, and strengthening. Meanwhile, Tropical Depression 16 formed west of Tropical Storm Omar.

This visible satellite image of the Atlantic Ocean basin shows Tropical Storm Omar to the lower right, and Tropical Depression 16 to the lower left. It was created on Oct. 14 at 9:48 a.m. EDT from the Geostationary Operational Environmental Satellites GOES-11 and GOES-12, which are operated by the National Oceanic and Atmospheric Administration. The image was created by NASA's GOES Project, located at NASA's Goddard Space Flight Center, Greenbelt, Md.

Tropical Storm Omar is bringing heavy rainfall over the Netherlands Antilles, and tropical storm watches are up for Puerto Rico, the U.S. Virgin Islands, British Virgin Islands, and the extreme eastern Dominican Republic. Portions of the Netherlands Antilles can expect between 4 and 8 inches of rain, with maximum amounts of 12 inches possible. Omar's rains also extend south into northern central Venezuela and the northern Guajira Peninsula. Up to 6 inches of rain from Omar are possible in those areas. All of these rains could produce life-threatening flash floods.

On Oct. 14 at 11:00 a.m. EDT Omar had maximum sustained winds near 40 mph, and was located near latitude 14.0 north and longitude 69.0 west. That's about 355 miles southwest of San Juan, Puerto Rico. Omar is moving southeast near 2 mph, and will turn east then northeast later today. The estimated minimum central pressure is 1001 millibars.

A tropical storm watch may be required later this afternoon for the islands of St. Martin, St. Eustatius and Saba.

Tropical Depression 16 Forms Raining on Honduras

Meanwhile, Tropical Depression 16 (TD16) has formed to the west of Omar, and is located about miles north-northeast of Cabo Gracias a Dios on the Nicaragua/Honduras Border. That's near 15.6 north latitude and 83.0 west longitude. TD 16's maximum sustained winds are near 30 mph and some strengthening is expected during the next couple of days as long as the center of depression remains offshore. That means TD16 could become a tropical storm by Wednesday. Its moving northwest near 7 mph, and will turn west later today. Minimum central pressure was 1004 millibars.

TD16 will bring heavy rains (4 to 8 inches, with isolated amounts up to 15 inches) over parts of Nicaragua, Honduras, and Belize over the next couple of days, and the government of Honduras issued a tropical storm warning from the border between Honduras and Nicaragua, westward to Limon.

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