Most typhoons begin between the 5th and 10th parallels, with Guam being a frequent starting point in the Western Pacific. When the wind speed there exceeds 60 kilometers per second, the Joint Typhoon Warning Center gives the storm a name and a typhoon is born.
以西太平洋來說，大約都在關島附近成形，待其中心風速每秒超過六十公尺，關島的「颱風聯合警戒中心」就會正式為它命名，宣佈又一颱風誕生。