What does downburst mean?
A downburst is a column of sinking air produced by a thunderstorm that accelerates as it descends and then bursts outward when it strikes the ground, generating damaging straight-line winds. Meteorologist T. Theodore Fujita identified and named the phenomenon in the 1970s, distinguishing it from tornadoes: instead of spiraling winds, a downblast of cool air spreads radially from its point of impact, sometimes flattening trees and structures over an area several kilometers wide. Downbursts are classified by size, with the intense, short-lived variety known as microbursts. They are especially hazardous to aircraft during takeoff and landing, because the abrupt shift from headwind to tailwind can cause a dangerous loss of lift. The term is chiefly technical, appearing in weather reports, aviation safety literature, and news coverage of storm damage. Its association with sudden, invisible danger has made it one of the more consequential additions to the vocabulary of severe weather.
nounA powerful downdraft of air from a thunderstorm that strikes the ground and spreads outward in all directions, producing damaging straight-line winds. It is a localized phenomenon, distinct from the rotating winds of a tornado.
- A strong downdraft of cold air from a thunderstorm that reaches the ground and spreads outward, causing straight-line wind damage.
"The storm's downburst flattened trees across a swath of the campground in seconds."
"Investigators concluded the airliner had been caught in a violent downburst on final approach."
"A single downburst during the summer storm toppled dozens of century-old oaks along the parkway."
Regular plural; countable, so both singular and plural are common.
"Downbursts account for much of the straight-line wind damage attributed to severe thunderstorms."
Downbursts were only identified as a distinct weather phenomenon in the 1970s — before meteorologist T. Theodore Fujita named them, many were misclassified as tornadoes, and some aviation disasters were blamed on pilot error rather than this invisible wind hazard.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of downburst
Downburst is a transparent English compound formed from 'down', indicating downward motion, and 'burst', indicating sudden forceful release — following the pattern of older compounds such as 'updraft' and 'outburst'. The compound itself was coined relatively recently: meteorologist T. Theodore Fujita introduced the term in the mid-1970s to describe the ground-level wind phenomena he identified through damage surveys, notably after investigating the crash of Eastern Air Lines Flight 66 at New York's JFK Airport in 1975. Its elements trace back to Old English 'dūn' and the Norse-influenced verb 'burst', making the word thoroughly Germanic in origin despite its modern coinage.
How downburst is actually used
Downburst is primarily a technical term used in meteorology, aviation, and severe-weather reporting; it appears rarely in casual conversation. It is neutral in connotation but strongly associated with sudden, destructive weather events. The term is used identically in British and American English.
Easily confused with downburst
A microburst is a specific type of downburst confined to a small area (under about 4 km) with intense winds lasting roughly five minutes, whereas 'downburst' is the broader term covering both small-scale microbursts and larger macrobursts.
A tornado's winds rotate around a funnel-shaped vortex, while downburst winds move in straight lines radiating outward from where the air mass hits the ground.