Young Callum O’Connor enjoys the after-effects of a Perth barrage storm in March 2010. – ABC
Hail is acquired back raindrops are aerial up into the atmosphere during a thunderstorm and afresh supercooled by temperatures beneath freezing, axis them into ice balls.
Thunderstorms are acutely airy acclimate systems and apprehension draft in all directions, including able updrafts and downdrafts.
When the able apprehension central a thunderstorm backpack the baptize aerosol aerial abundant to freeze, they about-face into tiny barrage stones.
Small barrage stones get bigger back downdrafts backpack them beneath the freezing point, breadth they are coated with a band of aqueous water, afore actuality aerial up afresh breadth the new band of baptize freezes.
In this action pea-sized barrage can become golf ball-sized hail, which can in about-face become tennis ball-sized barrage in the appropriate conditions.
The blocks of ice abatement to apple already they are too big and abundant for apprehension to accumulate them in the air.
According to Bureau of Meteorology archives, the better appear barrage stones in Australia accept collapsed in south-east Queensland.
On November 11, 1869 there were letters of barrage stones with a bore of 20 centimetres, belief added than bisected a kilogram, battering the greater Brisbane area. An eyewitness remarked that “hail acquired abundant accident to crops and cotton.”
Twenty-centimetre barrage was additionally appear in the Sunshine Coast association of Holts Hill on December 13, 1943, back a citizen declared the barrage as “considerably bigger than hens’ eggs.”
© ABC 2013
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