Microbursts: what causes the deadly, high-speed weather events?

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Microbursts: what causes the deadly, high-speed weather events?
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A Narrabeen woman has died after one of these severe storms delivered dangerous winds that felled trees and stripped roofs from houses

severe storm on Sydney’s northern beaches

A microburst refers to a downburst concentrated over a small area – less than 4km in diameter. Downbursts can affect wider areas than tornadoes – those that are larger than 4km in diameter are called macrobursts.Dr Linden Ashcroft, a climate scientist at the University of Melbourne, said downbursts can occur during severe thunderstorms.

A woman died and three people were injured when a tree fell in a car park in Narrabeen during a severe storm on Sydney’s northern beaches.Downbursts form when hail or large raindrops fall through drier air, cooling the surrounding air as they melt or evaporate. This colder air – which is more dense than warmer air – falls to the ground.

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