NASA sees powerful storms within Tropical Cyclone Ashobaa
2015-06-10
(Press-News.org) wo NASA satellites provided a look inside and outside of Tropical Cyclone Ashobaa. NASA and JAXA's GPM satellite observed rainfall rates and cloud heights identifying powerful thunderstorms within the cyclone, and NASA's Aqua satellite provided an overall look at Ashobaa's cloud extent.
The Global Precipitation Measurement (GPM) core observatory had an excellent view of Tropical Cyclone Ashobaa in the Arabian Sea over on June 8, 2015 at 2131 UTC (5:31 p.m. EDT). As expected, Tropical Cyclone Ashobaa was more powerful than when seen by GPM earlier in the day. GPM's Microwave Imager (GMI) and Dual-Frequency Precipitation Radar (DPR) instruments showed that rain was falling at a rate of over 70.5 mm (about 2.8 inches) per hour in bands of storms west of the center of circulation.
Very powerful storms were seen west of tropical cyclone ASHOBAA's center of circulation by GPM's Ku Band Radar. A 3-D view constructed from GPM's Ku band radar data shows that Tropical Cyclone Ashobaa had some extremely tall storms. GPM radar data indicated that some of these very intense storms were reaching the amazing height of 21 km (13 miles).
On June 10 at 09:00 UTC (5 a.m. EDT), the Moderate Resolution Imaging Spectroradiometer or MODIS instrument aboard NASA's Aqua satellite captured a visible image of Tropical Cyclone Ashobaa off the coast of Oman. There was no visible eye in the system, although it appears to be strengthening. Bands of thunderstorms were spiraling into the low-level center from the west and east. The MODIS image showed that the northwestern quadrant of the tropical storm was already sweeping over eastern Oman.
The Joint Typhoon Warning Center (JTWC) noted that "Animated multispectral satellite imagery depicts tight spiral banding wrapping beneath a central dense overcast feature that is elongated to the west due to moderate (15-20 knot) easterly vertical wind shear that will persist throughout the forecast period." Microwave imagery shows disorganized convection along the western edge of the storm, while an eye feature can be seen in microwave data.
By 1500 UTC (11 a.m. EDT), Ashobaa's maximum sustained winds had increased to 55 knots (63.9 mph/ 101.9 kph). Ashobaa was centered near 20.9 North latitude and 61.0 east longitude, about 138 nautical miles (158.8 miles/255.6 km) east-northeast of Masirah Island, Oman. The tropical storm is slowly moving west at 3 knots (3.4 mph/5.5 kph).
The JTWC now expects that Ashobaa will not reach hurricane-strength before making landfall early on June 12 and will weaken quickly thereafter between the interaction with land and dry air that is forecast to move into the circulation.
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[Press-News.org] NASA sees powerful storms within Tropical Cyclone Ashobaa
