Although the storm was tropical at this time , the NHC did not issue advisories for several hours .
However , the NHC first thought it did not become a tropical storm until later .
However , the NHC first thought it did not become a tropical storm until later .
이 문장을 더 간단한 방식으로 다시 작성하십시오: Although the storm was tropical at this time , the NHC did not issue advisories for several hours . 산출: