A severe localized downdraft from a thunderstorm or shower. This outward burst of cool or colder air creates damaging winds at or near the surface. Sometimes the damage resembles tornado damage.
Downdraft - A sudden descent of cool or cold air to the ground, usually with precipitation, and associated with a thunderstorm or shower. Contrast with an updraft.
Flash Flood - A flood that rises and falls quite rapidly with little or no advance warning, usually as the result of intense rainfall over a relatively small area. Flash floods can be caused by situations such as a sudden excessive rainfall, the failure of a dam, or the thaw of an ice jam.
Flood - High water flow or an overflow of rivers or streams from their natural or artificial banks, inundating adjacent low lying areas.
Flood Plain - Level land that may be submerged by floodwaters.
Flood Stage - The level of a river or stream where overflow onto surroundings areas can occur.
Fog - A visible aggregate of minute water droplets suspended in the atmosphere at or near the surface of the earth, reducing horizontal visibility to less than 5/8 statute miles. It is created when the temperature and the dew point of the air have become the same, or nearly the same, and sufficient condensation nuclei are present.
Microburst - A severe localized wind blasting down from a thunderstorm. It covers an area less than 2.5 miles (4 kilometers) in diameter and is of short duration, usually less than 5 minutes. See downburst.
Thunderstorm - Produced by a cumulonimbus cloud, it is a microscale event of relatively short duration characterized by thunder, lightning, gusty surface winds, turbulence, hail, icing, precipitation, moderate to extreme up and downdrafts, and under the most severe conditions, tornadoes.