Definitions for "Microburst"
A microburst is a small downburst of wind, with outbursts of damaging winds extending 2.5 miles or less. (despite it's small horizontal scale, a microburst can induce wind speeds up to 150 knots or 172.6 miles per hour) Return to your previous position.
A small downburst affecting an area less than 2.5 km in diameter.
A strong localized downdraft (downburst) less than 4 km wide that occurs beneath thunderstorms. A strong downburst greater than 4 km across is called a microburst.
Keywords:  plunge, convective, dense, cold, cloud
a strong concentrated plunge of cold dense air from a convective cloud
a lovely phenomenon not unlike a small atomic bomb