 On February 23, a large area of convection developed south of the Philippines Sea.The convection developed into a low pressure area and was at first bombarded by wind shear, but conditions soon turned favorable which allowed it to strengthen rapidly on February 27 before becoming a Tropical depression later that day.The JMA upgraded 01W into a Tropical Storm before it drifted over the Philippines on February 29, and weakened slightly due to land interaction.