Theo tin NASA July 25, 2017 Sonca (was 08W – South China Sea) NASA Sees Tropical Storm Sonca Making Landfall in Vietnam NASA’s Aqua satellite passed over Tropical Storm Sonca as it began making landfall in Vietnam. Aqua gathered temperature data using infrared light that showed the extent of the strongest storms. Those storms were generating heavy rains that were expected to affect Vietnam, Thailand and Laos. The Atmospheric Infrared Sounder or AIRS instrument aboard NASA’s Aqua satellite analyzed Tropical Storm Sonca in infrared light on July 24 at 1:41 a.m. EDT (0541 UTC). Infrared light provides scientists with temperature data and that’s important when trying to understand how strong storms can be. The higher the cloud tops, the colder and the stronger they are. So infrared light as that gathered by the AIRS instrument can identify the strongest storms within a tropical cyclone. AIRS infrared data showed an area of strong storms with cloud top temperatures as cold as minus 63 degrees Fahrenheit (minus 53 degrees Celsius) around the center as the western quadrant of the storm was already over the Vietnam coast. NASA research has shown that cloud tops that cold, which are high in the troposphere, have the ability to generate heavy rainfall. By 5 a.m. EDT (0900 UTC) on July 25, Sonca had made landfall and the Joint Typhoon Warning Center issued their final warning on the system. At that time, Sonca was located about 87 miles northwest of Da Nang, Vietnam near 17.0 degrees north latitude and 107.2 degrees east longitude. It made landfall with maximum sustained winds near 40 knots (46 mph/74 kph) and was moving west at 12 knots (13.8 mph/22.2 kph). Sonca is expected to dissipate inland but will continue to bring heavy rainfall over Vietnam, Thailand and Laos. The Thailand Meteorological Department warned that as Sonca continues to move west, it will bring heavy rain to most of Thailand from July 25 to 28. For updated forecasts from Vietnam’s National Center for Hydro-Meteorological Forecasting (NCHMF), visit: http://www.nchmf.gov.vn/web/en-US/43/Default.aspx For updated forecasts and warnings from the Thailand Meteorological Department, visit: https://www.tmd.go.th/en/ By Rob Gutro NASA’s Goddard Space Flight Center
Theo tin NASA July 24, 2017 Sonca (was 08W – South China Sea) NASA Watches as Vietnam Braces for Tropical Storm Sonca 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 July 24 at 1:45 a.m. EDT (05:45 UTC) NASA’s Aqua satellite captured this visible-light image of Tropical Storm Sonca approaching Vietnam.
Credits: NASA Goddard MODIS Rapid Response TeamTheo tin NOAA
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