The Watchers - April 8, 2013 - by Chillymanjaro
New tropical disturbance is taking shape in waters of Indian Ocean. According to latest report by Joint Typhoon Warning Center (JTWC), Tropical Cyclone 21S is located approximately 335 nm south- southwest of Diego Garcia, and is moving south-westward at speed of 11 knots.
MODIS satellite image captured on April 7, 213 (Credit: LANCE/MODIS/Worlview)
Animated infrared satellite imagery depicts a partially-exposed low-level circulation center located east of persistent deep convection. Sustainable winds of 35-40 knot were recorded over the western portion of the low level circulation center, which are wrapping into the center. Upper-level analysis indicates TC 21S is approximately five degrees equatorward of the subtropical ridge axis. Vertical wind shear remains moderate (15-20 knots), causing the deep convection to be sheared to the west. Animated water vapor imagery depicts moderate poleward outflow; however, equatorward outflow is limited due to troughing.
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