An upward current of air, usually within a thundercloud. Winds that shift in a clockwise direction, a shift caused by a high-pressure system. Water droplets or ice crystals that fall from high clouds but that evaporate before hitting the ground. The leading edge of a mass of warmer air that displaces a mass of colder air. A threatening weather condition is occuring as indicated by a radar or spotter, or is expected to occur or strike an area very soon.
Conditions are favorable for a certain threatening weather condition to occur.
It doesn't mean the threatening weather condition is occuring. A tornado-like formation over water, usually much smaller and less vigorous than a true tornado. Waterspouts tend to occur most frequently in tropical waters, although they have been observed on the Great Lakes and on other northern lakes in Canada and the United States. The invisible gaseous form of water. A small cyclonic circulation in the early stages of development that moves along a cold front.