FAI Weather Practice Exam

The expected duration of an individual microburst is often around 15 minutes from the moment the burst strikes the ground until it dissipates. Microbursts are intense localized downdrafts that can result in strong winds and sudden changes in weather conditions. Their short-lived nature is due to the rapid upward motion of air that occurs in the surrounding thunderstorm. As the downdraft strikes the ground, it spreads out and can create hazardous conditions, but this process typically takes place quickly. Therefore, the assertion that they seldom last longer than 15 minutes accurately reflects the transient nature of microbursts in meteorological phenomena.

The other options either overstate the typical duration or provide a less accurate timeframe, which does not align with observed meteorological data regarding microburst lifespan.