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Hurricane Season 2006: Rosa (Eastern Pacific)
11.09.06
 
Pacific's Tropical Storm Rosa and 20th Tropical Depression Come and Go Over Weekend

The eastern Pacific Ocean was active over Veteran's Day Weekend with Tropical Storm Rosa fading on Nov. 10 and the formation and dissipation of the basin's 20th tropical depression (20-E).

The National Hurricane Center (NHC) noted that Tropical Storm Rosa, shown here in images from an instrument on NASA's Aqua satellite on Nov. 9, dissipated by Nov. 10 at 1:00 p.m. PST. The NHC said that high-resolution visible satellite images showed Rosa's circulation collapsed into a very broad area of low pressure. Rosa lost the characteristics required to be classified as a tropical cyclone. The last forecast position for Rosa on Nov. 10 at 1:00 p.m. PST was 16.2 north latitude and 106.5 west longitude. At that time, Rosa's remnants had sustained winds of 25 knots (29 mph) and it was already dissipating.

Tropical Depression 20-E was short-lived. It formed on Nov. 11 at 2:00 a.m. PDT and dissipated late that night. The depression formed about 620 nautical miles south-southwest of the southern tip of Baja California, with sustained winds of 30 knots (35 mph). Its circulation was confirmed using NASA's QuikScat satellite data. It moved into an area of increasing west to northwesterly winds and over cooler sea surface temperatures. By 10:00 p.m. PST on Nov. 11, 20-E had dissipated.

This is an infrared image of Tropical Storm Rosa in the Eastern Pacific from the Atmospheric Infrared Sounder  on NASA's Aqua satellite on Nov. 9, 12:35 a.m. PST.
Click image to enlarge

The image above is an infrared image of Tropical Storm Rosa in the Eastern Pacific from the Atmospheric Infrared Sounder (AIRS) on NASA's Aqua satellite on Nov. 9, 12:35 a.m. PST. This AIRS image shows the temperature of the cloud tops or the surface of the Earth in cloud-free regions. The lowest temperatures (purple) are associated with high, cold cloud tops that make up the top of the tropical storm. 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 image is created from microwave radiation emitted by Earth's atmosphere and received by Aqua's AIRS instrument.
Click image to enlarge

This image is created from microwave radiation emitted by Earth's atmosphere and received by Aqua's AIRS instrument. It shows the small area where the heaviest rainfall was taking place (in blue, surrounded by yellow/green) in the storm. Blue areas outside of the tropical storm (bottom of image, near Baja California), where there are either some clouds or no clouds, indicate where the sea surface shines through. Credits: Image--NASA/JPL; Caption--Rob Gutro, GSFC



Rosa is the New Tropical Storm in the Eastern Pacific

Tropical Storm Rosa
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Tropical Depression #19-E became the newest tropical storm in the eastern Pacific Ocean on Thurs. Nov. 9 when her maximum sustained winds reached 35 knots (40 mph) with gusts to 45 knots (52 mph).

At 1:00 p.m. PST (2100 UTC) on Thurs. Nov. 9, the center of Rosa was located near 15.8 north latitude and 105.4 west longitude. Rosa was moving toward the north at 4 knots (4.6 mph), and had a minimum central pressure of 1003 millibars.

These images from the Tropical Rainfall Measuring Mission (TRMM) satellite were taken on Nov. 8, 1506 UTC (7:06 a.m. PDT) before Rosa developed into a tropical storm. When these images were developed Rosa was labeled "19E." That number that was used to keep track of it when National Hurricane Center (NHC) was watching it for possible development. The left image shows a top-down-view of the rain intensity obtained from TRMM's sensors. Estimated rain rates range from 1 millimeter to 30 millimeters (.3 to 1.18 inches) per hour. TRMM is a joint mission between NASA and the Japanese space agency JAXA.

The right-hand image shows the height of the clouds and rainfall. The tallest thunderstorm reaches approximately 15 kilometers (9 miles) high, indicative of a strengthening in the storm. The day after this image, Tropical Depression #19-E did in fact strengthen into Tropical Storm Rosa.

According to the National Hurricane Center, however, Rosa is expected to dissipate by early in the week of Nov. 20. Credits: Image-- NASA/JAXA, Hal Pierce, NASA GSFC; Caption--Rob Gutro, Goddard Space Flight Center



Nineteenth Tropical Depression Forms in the Eastern Pacific

Image of Tropical Depression 19 which formed in the Eastern Pacific as seen by GOES.

Tropical Depression #19-E (bottom right in image) can be seen in this satellite image from the National Oceanic and Atmospheric Administration's Geostationary Operational Environmental Satellite (GOES). This satellite image was captured on Wed., Nov. 8 at 7:49 a.m. EST (4:49 a.m. PST). This data was processed by NASA's GOES Project at the Goddard Space Flight Center, Greenbelt, Md.

At 7:00 a.m. PST (1500 UTC) on Nov. 8, Tropical Depression #19-E was located at 13.6 north latitude and 104.3 west longitude, centered some 300 plus miles south-southwest of Zihuatanejo, Mexico.

TD#19-E is moving to the northwest at 6 knots (7 mph) and is packing maximum sustained winds of 30 knots (35 mph) with gusts to 40 knots (46 mph). Its minimum central pressure is 1005 millibars.

The National Hurricane Center noted at 7:00 a.m. PST, that "The depression is near tropical storm strength and some intensification is likely over the next day or so. Thereafter it is expected that the system will feel the influence of the strong west-southwesterly flow just to its north which would limit the intensification process." Credit: NASA GOES Project