The National Weather Service issues a significant weather alert if hail size in a thunderstorm is less than 1 inch in diameter.
冰雹直徑不超過(guò)1寸時(shí)，國(guó)家氣象局會(huì)發(fā)布重要天氣警報(bào)。
那么，颶風(fēng)預(yù)警就是tornado warning，這里的暴雪預(yù)警就是heavy snow warning.
