DICT.TW Dictionary Taiwan

 Squall n.  A sudden and violent gust of wind often attended with rain or snow.
    The gray skirts of a lifting squall.   --Tennyson.
 Black squall, a squall attended with dark, heavy clouds.
 Thick squall, a black squall accompanied by rain, hail, sleet, or snow. --Totten.
 White squall, a squall which comes unexpectedly, without being marked in its approach by the clouds.