Tropical Cyclone Sandra (19P) Off Coast of Australia
The area of convection off the coast of Australia (click here for previous images) has been upgraded to Tropical Cyclone Sandra (19P). The system, located approximately 710 nm northwest of Noumea, New Caledonia, has tracked northeastward at 05 knots over the past six hours. Maximum significant wave height is 15 feet.
Animated multispectral satellite imagery shows flaring deep central convection over a well-defined low-level circulation center (LLCC). The initial position is based on an extrapolation from an SSMIS 37ghz image, close to the KNES and ABRF center fixes, with poor confidence due to the extrapolation method.
The initial intensity is based on congruent Dvorak estimates of 45 knots from all reporting agencies (PGTW, KNES, and ABRF). Upper-level analysis indicates the system is west of an anticyclone in an area of light to moderate (10-20 knot) easterly vertical wind shear (VWS).
Animated water vapor imagery shows ample equatorward outflow with enhanced eastward outflow into deep troughing near the dateline. Additionally, there is slight poleward enhancement to the outflow provided by an upper-level low over eastern Australia.