on march 30, the jma began monitoring an area of low pressure southwest of yap. by april 2, the system developed a low-level circulation, though convection appeared disorganized. exhibiting good outflow within a region of weak wind shear, the low was anticipated to develop further over the following several days as it drifted west-northwestward. after briefly stalling early on april 3, the storm turned towards the east. additionally, the jma considered the system sufficiently organized to be declared a tropical depression. as the system was to the west of 135°e, pagasa began issuing advisories on the depression as well, assigning it the name "amang". tracking northeastward, the depression eventually developed enough convection to be declared tropical depression 02w by the jtwc on april 4. however, this was expected to be brief as a decaying frontal boundary approached from the west and prompted the system to undergo an extratropical transition. this intensification prompted the national weather service (nws) in tiyan, guam to issue a tropical storm warning for the islands of agrihan, pagan and alamagan. interacting with the front and high wind shear, the system became partially exposed and elongated as it moved over cooler waters. early on april 6, the jtwc issued their final advisory on the depression as it began to dissipate over open waters. following degradation of the storm's structure, the nws discontinued warnings for the mariana islands on april 6. the jma continued to monitor the system for several more hours before ceasing advisories on it as well.