A small area of convection 600 miles southeast of Rio de Janeiro moved into an area of low wind shear and barely 26°C warm waters on February 23, 2006. The wave had deep convection, was able to form a closed LLC and had 35 mi/h (56 km/h) winds as measured by Quikscat on February 24, 2006. These characteristics were operationally recognized for three hours before high shear began to tear the system apart, just short of the six hours required to be officially declared a tropical depression. It is possible that the system maintained these features longer and may have briefly been a tropical depression. While under study, the system was referred to as 90L Invest. The shear would eventually cause the system to dissipate later that night. Picture