 In late May , an area of disturbed weather began to persist in the South China Sea . The JTWC began to monitor the storm cluster on May 29 . The following day , the JMA reclassified the system as a tropical depression ; initially the system remained highly disorganized due to the lack of deep convection . Persistent moderate wind shear and dry air prevented the cyclone from strengthening significantly in the storm 's early stages . These conditions abated as the depression tracked northeast , and at 0000 UTC on June 1 , the JMA upgraded the system to Tropical Storm Nangka . Throughout the course of the day , Nangka continued to strengthen as it accelerated northeast , and peaked in strength with a barometric pressure of 985 mbar ( hPa ; 29 @.@ 09 inHg ) and maximum sustained winds of 95 km / h ( 60 mph ) , making it a severe tropical storm . 
 In late May , an area of disturbed weather began to persist in the South China Sea . The JTWC began to monitor the storm cluster on May 29 . The following day , the JMA<a href='been_done' title='1'><mark></mark></a> reclassified the system as a tropical depression ; initially the system remained highly disorganized due to the lack of deep convection . Persistent moderate wind shear and dry air prevented the cyclone from strengthening significantly in the storm <a href='null_genetive' title='2'><mark>'s</mark></a>early stages . These conditions abated as the depression tracked northeast , and at 0000 UTC on June 1 , the JMA upgraded the system to Tropical Storm Nangka . Throughout the course of the day , Nangka continued to strengthen as it accelerated northeast , and<a href='been_done' title='3'><mark></mark></a> peaked in strength with a barometric pressure of 985 mbar ( hPa ; 29 @.@ 09 inHg ) and maximum sustained winds of 95 km / h ( 60 mph ) , making it a severe tropical storm . 
In late May , an area of disturbed weather began to persist in da South China Sea . TdaJTWC began to monitor thdatorm cluster on May 29 . The following day , thedaA been reclassified the system as a tropical depression ; initially the datem remained highly disorganized due to the lack of deep convection . Persistent moderate wind shear and dry air prevented the cyclone from strengthening significantly in the sdam  early stages . These conditions abated as the depression tracked northeast , and at 0000 UTC on June 1 , the JMA upgraded the system to Tropical Storm Nangka . Throughout the codae of the day , Nangka continued to strengthen as it accelerated northeast , and done peaked in strength with a barometric pressure of 985 mbar ( hPa ; 29 @.@ 09 inHg ) and maximum sustained winds of 95 km / h ( 60 mph ) , wit it a severe tropical storm .