Tropical Cyclone 21S formed in Indian Ocean

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.

Meteosat’s Southwest Indian Ocean Infrared satellite image (Credit: Météo France)

 

Tc 21s will continue to track west-southwestward through the next 48 hours under the influence of the deep layered subtropical ridge to the south. A gradual decrease in vertical wind shear and fair outflow will allow for intensification. Additionally, a pool of higher ocean heat content located along the forecast track will aid in this intensification.

Tropical Cyclone 21S forecast track (Credit: JTWC)

Satellite Animations

• Storm-Centered Infrared (Meteosat 7; CIMSS)
• Storm-Centered Enhanced Infrared (Meteosat 7; CIMSS)
• Storm-Centered Water Vapor (Meteosat 7; CIMSS)
• Storm-Centered Visible (Meteosat 7; CIMSS)

• Meteosat 7 Infrared (Meteosat 7; CIMSS)
• Meteosat 7 Infrared (Color Background) (Meteosat 7; CIMSS)
• Meteosat 7 Infrared (NHC Color Enhancement) (Meteosat 7; CIMSS)
• Meteosat 7 Water Vapor (Meteosat 7; CIMSS)
• Meteosat 7 Water Vapor (Color Background) (Meteosat 7; CIMSS)