macroburst

(from the article `thunderstorm`) Sometimes thunderstorms will produce intense downdrafts that create damaging winds on the ground. These downdrafts are referred to as macrobursts or ...
Found on http://www.britannica.com/eb/a-z/m/6

macroburst

macroburst A strong downdraft, of over 2.5 miles in diameter, that can cause damaging winds. A downdraft, or downburst, is a column of sinking air that is capable of producing damaging straight-line winds of over 150 mph (240 km/h), similar to, but distinguishable from tornadoes. Downburst damage will radiate from a central point as the descending
Found on http://www.wordinfo.info/words/index/info/view_unit/1234/2

MACROBURST

A large downburst with an outflow diameter of 2.5 miles (4 kilometers) or larger and damaging winds.
Found on http://www.weather.com/glossary/m.html

Macroburst

Large downburst with a 2.5 mile or greater outflow diameter and damaging winds lasting 5 to 20 minutes.
Found on http://www.erh.noaa.gov/box/glossary.htm

MACROBURST

Large downbursts with a 2.5 mi or greater outflow diameter and damaging winds lasting 5 to 20 minutes.
Found on http://ggweather.com/glossary.htm

Macroburst

A large downdraft of air with an outflow diameter of 2.5 miles or greater and damaging winds lasting from 5 to 20 minutes. May reach tornado intensity.
Found on http://www.weca.org/nws-terms.html

Macroburst

A large downburst with an outflow diameter of 2.5 miles (4 kilometers) or larger and damaging winds.
Found on http://www.superglossary.com/Glossary/Science/Weather/
No exact match found