When Nangka was upgraded to a tropical storm by the JTWC early on July 4 , convective bands were wrapping into the center .
When Nangka was upgraded to a tropical storm by the JTWC early on July 4 , convective bands limited by dry air to the west .
When Nangka was upgraded to a tropical storm by the JTWC early on July 4 , convective bands were wrapping into the center , but limited by dry air to the west .