Feature

Text Size

Tropical Storm Ewiniar (Pacific Ocean)
10.02.12
 
On Sept. 29, MODIS captured this visible, true-color image of Ewiniar. › View larger image
On Sept. 29, NASA's Aqua satellite passed over Ewiniar at 0315 UTC (Sept. 28 at 11:15 p.m. EDT) and captured this visible, true-color image of the storm. Ewiniar had weakened more and became extra-tropical on Sept. 30. Wind shear took its toll and Ewiniar rolled into the tropical history books on Sept. 30
Credit: MODIS Rapid Response Team
NASA's Aqua satellite captured the image of a fading Tropical Storm Ewiniar off the coast of Japan.

The last official location for Ewiniar was posted by the Joint Typhoon Warning Center on Sept. 28 at 0900 UTC (5 a.m. EDT). At that time, Tropical Storm Ewiniar's maximum sustained winds dropped from 55 knots (63.2 mph/102 kmh) to 45 knots (51.7 mph/83.3 kmh). It was located near 32.3 North and 143.5 East, about 280 nautical miles (322 miles/518.6 km) southeast of Tokyo, Japan and further away since Sept. 27. Ewiniar is moving to the east-northeast at 8 knots (9.2 mph/14.8 kmh).

On Sept. 29, NASA's Aqua satellite passed over Ewiniar at 0315 UTC (Sept. 28 at 11:15 p.m. EDT) and captured this visible, true-color image of the storm. Ewiniar had weakened more and became extra-tropical on Sept. 30. Wind shear took its toll and Ewiniar rolled into the tropical history books on Sept. 30.

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




Sept. 28, 2012

TRMM satellite noticed light to moderate rainfall (blue and green) around most of Tropical Storm Ewiniar › View larger image
NASA's TRMM satellite noticed light to moderate rainfall (blue and green) around most of Tropical Storm Ewiniar, with the heaviest rainfall (red) east of the center of circulation. Rainfall in that area was falling at a rate of 2 inches (50 mm) per hour). Japan is visible in the top left corner of the image.
Credit: NASA JPL/Ed Olsen
NASA Sees Many Things Happening in Tropical Storm Ewiniar

There are a number of things happening under the hood of Tropical Storm Ewiniar's clouds that have been deciphered by satellite data today, Sept. 28, 2012, and NASA's TRMM satellite has noticed one area of heavy rainfall remaining.

NASA's Tropical Rainfall Measuring Mission (TRMM) satellite noticed light to moderate rainfall around most of the tropical storm, with the heaviest rainfall east of the center of circulation. Rainfall in that area was falling at a rate of 2 inches (50 mm) per hour).

Tropical Storm Ewiniar has a partially exposed low-level circulation center, which opens the lower level of the storm to outside winds that can adversely affect it. Satellite data also revealed that there are bands of convective thunderstorms wrapping around the center from the southeast to the northern quadrant of the storm. Within that band, the strongest thunderstorms are on the eastern quadrant. In addition, microwave satellite data shows an eye feature today, Sept. 28.

As Tropical Storm Ewiniar continues to move northward it remains embedded in an elongated area of low pressure (called a trough) off Japan's east coast. The trough continues to bring strong westerly winds into Ewiniar at a rate of speed between 40 and 50 knots. Although facing this strong wind shear, Ewiniar continues to keep its tropical warm core.

On Sept. 28 at 0900 UTC (5 a.m. EDT, Tropical Storm Ewiniar's maximum sustained winds dropped from 55 knots (63.2 mph/102 kmh) to 45 knots (51.7 mph/83.3 kmh). It was located near 32.3 North and 143.5 East, about 280 nautical miles (322 miles/518.6 km) southeast of Tokyo, Japan and further away since Sept. 27. Ewiniar is moving to the east-northeast at 8 knots (9.2 mph/14.8 kmh) and is expected to turn to the northeast over the weekend of Sept. 29 and 30, and farther away from Japan.

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



Sept. 27, 2012

AIRS image of Ewiniar ›View larger image
This infrared image was created from AIRS data of Tropical Storm Ewiniar on Sept. 27 at 0323 UTC as the storm nears eastern central Japan. The strongest thunderstorms with very cold cloud top temperatures appear in purple.
Credit: NASA JPL/Ed Olsen
NASA Sees Tropical Storm Ewiniar Embedded in Low Pressure

NASA's Aqua satellite passed over Tropical Storm Ewiniar and noticed strong convection still persists in the storm, despite now being embedded in a subtropical area of low pressure off the coast of Japan.

As Tropical Storm Ewiniar continues to move northward it wound up in an elongated area of low pressure (called a trough) off Japan's east coast. The trough is bringing a strong westerly flow of air into Ewiniar. Despite being battered by those winds, infrared data from the Atmospheric Infrared Sounder (AIRS) instrument that flies aboard NASA's Aqua satellite is showing that Ewiniar is managing to keep its tropical characteristics. AIRS data on Sept. 27 at 0323 UTC revealed that there is still strong thunderstorms in a band over the northern semi-circle, and weaker bands of thunderstorms around the rest of Ewiniar.

On Sept. 27 at 1500 UTC (11 a.m. EDT, Tropical Storm Ewiniar had maximum sustained winds near 55 knots (63.2 mph/102 kmh). It was located near 31.8 North and 141.9 East, about 265 nautical miles (305 miles/491 km) south-southeast of Tokyo, Japan. Ewiniar is moving to the north-northwest 6 knots (7 mph/11 kmh) and is expected to turn to the north-northeast over the next several days, taking it away from Japan.

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



Sept. 26, 2012

TRMM satellite captured rainfall rates from Jelawat and Ewiniar on Sept. 24, 2012 at 12:10 p.m. EDT. › View larger image
The TRMM satellite captured rainfall rates from Typhoon Jelawat and Tropical Storm Ewiniar on Sept. 24, 2012 at 1610 UTC (12:10 p.m. EDT). TRMM data showed that heaviest rainfall (purple) falling at a rate of around 80 mm/3.1 inches per hour around the tight eye of Typhoon Jelawat, while Ewiniar had small areas of moderate to heavy rainfall northeast of the center of circulation. Heavy rainfall appears in red, falling at 2 inches/50 mm per hour. Light to moderate rainfall is depicted in blue and green (falling at a rate between .78 to 1.57 inches (20 to 40 mm) per hour.
Credit: SSAI/NASA, Hal Pierce
NASA Sees Very Heavy Rain in Super Typhoon Jelawat and Heavy Rain Pushed from Ewinar's Center

NASA's TRMM satellite measured the rainfall of Super Typhoon Jelawat and Tropical Storm Ewiniar as they continue moving through the western North Pacific Ocean. Super Typhoon Jelawat had super rainfall rates around its eye, while nearby Tropical Storm Ewinar's heaviest rainfall was pushed north and west of its center because of wind shear.

Jelawat was intensifying and close to a category five super typhoon when NASA's Tropical Rainfall Measuring Mission (TRMM) satellite passed above on September 24, 2012 at 1611 UTC (12:11 p.m.). A 3-D image was created using TRMM's Precipitation Radar (PR) instrument that showed hot towering thunderstorms around the tight center of circulation.

TRMM data showed that heaviest rainfall in Super Typhoon Jelawat was falling at a rate of around 3.1 inches (80 mm) per hour around the storm's tight eye. The eyewall replacement was completed today, Sept. 26, and Jelawat's clear eye is now 25 nautical miles (28.7 miles/46.3 km) wide, 8 nautical miles (9.2 miles/14.8 km) wider than it was on Sept. 25.

On Wednesday, Sept. 26, Jelawat was located 495 nautical miles (569 miles/917 km) south-southwest of Kadena Air Base, Okinawa, Japan, and has tracked northwestward at 5 knots (5.7 mph/9.3 kmh). Jelawat is forecast to continue tracking northwest and then make a turn to the northeast on Sept. 28 when it runs into an elongated area of low pressure moving east from the Yellow Sea. That turn puts Kadena Air Base, Okinawa, Japan near the center of the forecast track from the Joint Typhoon Warning Center.

NASA's Atmospheric Infrared Sounder (AIRS) instrument that flies aboard NASA's Aqua satellite captured this infrared image of Super Typhoon Jelawat on Sept. 25 at 1:23 p.m. EDT. The clear 28 mile wide eye is seen surrounded by strong thunderstorms with very cold cloud top temperatures exceeding -63F/-52C.

East of Jelawat, Tropical Storm Ewiniar is spinning in the western North Pacific Ocean. On Sept. 24, the TRMM satellite noticed that Tropical Storm Ewiniar had small areas of moderate to heavy rainfall northeast of the center of circulation. That rainfall was falling at 2 inches (50 mm) per hour. Rainfall had become weaker during the early part of Sept. 26 as wind shear continues to batter the storm from the southwest. On Sept. 26, Ewiniar's maximum sustained winds were near 45 knots (52 mph/83.3 kmh). Ewiniar was located 485 nautical miles (558 miles/898 km) south-southeast of Yokosuka, Japan, has tracked north-northeastward at 13 knots (15 mph/24 kmh). Ewiniar is forecast to turn more northward over the next day, and then turn to the northeast.

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



Sept. 25, 2012

This combined image was created from infrared AIRS data of Super Typhoon Jelawat on Sept. 25 and Tropical Storm Ewiniar on Sept. 24 to give perspective of their distance from each other. › View larger image
This combined image was created from infrared AIRS data of Super Typhoon Jelawat on Sept. 25 and Tropical Storm Ewiniar on Sept. 24 to give perspective of their distance from each other. The eye of Jelawat is clearly visible in the middle of powerful thunderstorms (purple) with very cold cloud top temperatures.
Credit: NASA JPL/Ed Olsen
NASA Infrared Data Compares Super Typhoon Jelawat with Tropical Storm Ewiniar

NASA's Aqua satellite has been obtaining infrared, visible and other data everytime it passes over Typhoon Jelawat and Tropical Storm Ewiniar in the western North Pacific, and a combination of two images from Aqua's AIRS satellite puts the storms in perspective.

A combined image created from infrared data obtained by the Atmospheric Infrared Sounder (AIRS) instrument that flies on NASA's Aqua satellite provides a comparison of the two monster storms in the western North Pacific Ocean basin . An infrared image of Typhoon Jelawat captured on Sept. 25 was combined with an image of Tropical Storm Ewiniar, that was taken on Sept. 24. The combined image gives perspective of the distance of the tropical cyclones from each other. The image showed the close proximity of the storms. Earlier in the week, Jelawat's outflow was affecting Ewiniar and preventing it from strengthening more quickly.

The data also showed a visible eye in the center of super typhoon Jelawat in the middle of powerful thunderstorms with very cold cloud top temperatures that exceed -63 Fahrenheit (-52 Celsius). Jelawat also has a rounded shape indicating that circulation is strong and symmetrical. Tropical Storm Ewiniar, however, appears somewhat asymmetrical, in the form of an elongated comma shape. The comma's "tail" is a large band of strong thunderstorms wrapping into Ewiniar's center from the southeast.

The Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured a natural-color image on September 24, 2012, showing Jelawat just east of the Philippines. Sporting a distinct eye and spiral arms characteristic of strong storms, Jelawat spanned hundreds of kilometers (miles). As of September 24, 2012, the Joint Typhoon Warning Center (JTWC) classified Jelawat as a super typhoon. For the MODIS image, visit: http://lance-modis.eosdis.nasa.gov/cgi-bin/imagery/single.cgi?image=Jelawat.A2012268.0430.2km.jpg.

Jelawat remains a super typhoon today, Sept. 25, with maximum sustained winds near 140 knots (161 mph/259 kmh). It is located 385 nautical miles east-northeast of Manila, Philippines, and is moving north-northwestward at 6 knots (7 mph/11 kmh). Satellite imagery is showing tightly wrapped bands of thunderstorms spiraling into the eye of the storm. The eye is about 17 nautical miles wide. High pressure in the upper atmosphere and low wind shear are helping the super typhoon maintain its intensity. The JTWC projected storm track showed the storm moving toward the north-northwest over the next several days, passing near the island of Taiwan before turning toward the northeast.

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



Sept. 24, 2012

This infrared image was taken on Sept. 24 and revealed that Typhoon Jelawat and Tropical Storm Ewinar had large areas of strong thunderstorms and heavy rainfall around the center of circulation. › View larger image
This infrared image was taken on Sept. 24 and revealed that Typhoon Jelawat and Tropical Storm Ewinar had large areas of strong thunderstorms and heavy rainfall around the center of circulation. The above infrared images of Tropical Storm Jelawat (top) and Tropical Storm Ewiniar (bottom) were captured by the AIRS instrument aboard NASA's Aqua satellite. The images were taken on Sept. 24 and revealed that Typhoon Jelawat and Tropical Storm Ewiniar had large areas of strong thunderstorms (purple) and heavy rainfall around the center of circulation.
Credit: NASA JPL, Ed Olsen
Frigid Cloudtop Temperatures Indicate Strength in Super Typhoon Jelawat and Tropical Storm Ewiniar

Tropical Storm Jelawat had been moving toward the Philippines since the week of Sept. 17 and on Sept. 24 it became a super typhoon east of the country. Meanwhile, the nineteenth tropical depression formed just east of Jelawat in the western North Pacific Ocean and quickly strengthened into a tropical storm. Both storms were captured on one infrared image from NASA's Aqua satellite.

The Atmospheric Infrared Sounder (AIRS) instrument aboard NASA's Aqua satellite revealed a large area of powerful thunderstorms around the center of Typhoon Jelawat and a band of thunderstorms west of the center on Sept. 23. Those thunderstorms continued to strengthen on Sept. 24 and cloud top temperatures exceeded -63 Fahrenheit (-52 Celsius). Cloud top temperatures are an indication of uplift in a storm. Uplift is the push of air upward that allows formation of towering clouds and thunderstorms that make up a tropical cyclone.

Jelawat's center continues to stay east of the Philippines, but is causing rough surf (with wave heights up to 37 feet/11.2 meters) along the eastern coasts of the country and its large extent is bringing rains and gusty winds as well.

Jelawat is a powerful Super Typhoon with a clear 23 nautical mile-wide eye and maximum sustained winds near 130 knots (149.6 mph/240.8 kmh).Jelawat is a Category 4 typhoon on the Saffir-Simpson scale. It is located near 15.0 North latitude and 127.9 East longitude, approximately 410 nautical miles (472 miles/759 km) east of Manila, Philippines. Jelawat's minimum central pressure is near 926 millibars. Jelawat is forecast to track to the northwest through the Philippine Sea and move toward Taiwan.

Tropical Storm Ewiniar had maximum sustained winds near 35 knots (40 mph/64.8 kmh) on Sept 24 at 1500 UTC (11:00 a.m. EDT). It was centered near 20.9 North and 138.9 East, a 300 nautical miles (345 miles/555.6 km) south-southwest of Iwo To. AIRS data showed that the low-level center is slowly consolidating (organizing) and becoming less elongated. The strongest convection and thunderstorms were seen in a band of thunderstorms east of the center of circulation. Ewiniar is getting organized slowly because of westerly wind shear caused by nearby Typhoon Jelawat.

The Joint Typhoon Warning Center expects Ewiniar to track to the north-northeast and affect Iwo Two tomorrow, Sept. 25 as it continues in a northeasterly direction.

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