What is a Wind Gust?
Definition
A gust is a brief, sudden increase in wind speed that typically lasts less than 20 seconds. It is characterized by a rapid surge in speed above the average wind speed, with a minimum threshold of 16 knots.
Causes
Gusts are caused by various factors, including:
- Obstructions: Tall buildings and other obstacles can create turbulence, leading to gusts.
- Weather conditions: Downdrafts from thunderstorms can form gust fronts, which are lines of strong, gusty winds.
Duration and Intensity
Gusts are generally short-lived, lasting only a few seconds. However, they can vary in intensity, with some gusts reaching speeds of up to 60 mph.
Impact
Gusts can have significant impacts, including:
- Wind damage: Gusts can cause damage to trees, power lines, and buildings.
- Transportation hazards: Gusts can create hazardous conditions for driving, boating, and flying.
Etymology
The term "gust" comes from the Middle English word "gust," meaning "a sudden rush of wind." It is related to the Old Norse word "gustr," meaning "a blast of wind."
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