Theo tin NASA Sept. 13, 2017 Doksuri (was 21W – NW Pacific Ocean) NASA Sees Spiraling Bands of Storms Wrap into Tropical Cyclone Doksuri NASA’s Aqua satellite observed fragmented feeder bands of strong thunderstorms spiraling into the low-level center of Tropical Cyclone Doksuri. On Sept. 13 at 2:10 a.m. EDT (0610 UTC) the Moderate Resolution Imaging Spectroradiometer or MODIS instrument that flies aboard NASA’s Aqua satellite captured a visible-light image of the storm as it moved west in the South China Sea. Fragmented bands of thunderstorms spiraled into the center from the western and southern sides of the storm. Tropical depression 21W strengthened into a tropical storm and was renamed “Doksuri.” On Sept. 13, 2017 at 11 a.m. EDT (1500 UTC) Doksuri’s maximum sustained winds were near 51.7 mph (45 knots/83.3 kph), so it is at tropical storm strength. Doksuri was centered near 15.8 degrees north latitude and 114.0 degrees east longitude, about 359 nautical miles east of Da Nang, Vietnam. Doksuri has tracked to the west-northwestward at 16 mph (14 knots/26 kph). The Joint Typhoon Warning Center expects Doksuri to intensify over the next day and a half and move through the Gulf of Tonkin and make landfall in northeastern Vietnam on Sept. 15. After landfall, the system is forecast to rapidly erode and dissipate by tau 72 over the mountains of northern Thailand. NASA’s Aqua satellite took a look at an elongated Tropical Storm Sonca in the South China Sea as it approached Vietnam where it is expected to make landfall. Tropical Depression 08W strengthened into a tropical storm on July 23 and was renamed Sonca. On July 24 at 1:45 a.m. EDT (05:45 UTC) the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA’s Aqua satellite captured a visible-light image of Tropical Storm Sonca approaching Vietnam. Sonca appears slightly elongated in the visible imagery. Forecasters at the Joint Typhoon Warning Center who looked at Sonca with multispectral satellite imagery noted that the central convection and thunderstorms associated with the storm were displaced slightly to the west of the center as a result of wind shear. That displacement makes the storm appear somewhat elongated on visible imagery. That easterly wind shear is weakening, however, which will allow Sonca to strengthen slightly before it makes landfall just south of the city of Vinh. Vinh is the capital of Nghệ An Province and is located on the North Central Coast. At 5 a.m. EDT (0900 UTC) on July 24, Sonca’s maximum sustained winds were near 46 mph (40 knots/74 kph). It was centered near 17.0 degrees north latitude and 110.9 degrees east longitude. That’s about 161 miles east-northeast of Da Nang, Vietnam. Sonca was moving west at 5.7 mph (5 knots/9.2 kph). Warnings and watches stretch from the North Bacbo Gulf in northern Vietnam to Cau Mau to Binj Thujan in the south. Sonca is forecast to strengthen to 57 mph (50 knots/92 kph) before making landfall in central Vietnam on July 25. For updated watches and warnings from the Vietnam’ National Centre for Hydro-Meteorological Forecasting http://www.nchmf.gov.vn. By Rob Gutro NASA’s Goddard Space Flight Center https://www.nasa.gov/feature/goddard/2017/08w-south-china-sea
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On Sept. 13 at 2:10 a.m. EDT (0610 UTC) the MODIS instrument aboard NASA’s Aqua satellite captured this visible image of Typhoon Doksuri in the South China Sea. Credit: Credits: NASA Goddard MODIS Rapid Response Team
Credits: NASA Goddard MODIS Rapid Response TeamTheo tin NOAA
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