updraft

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updraft

A localized upward current of air.
References in periodicals archive ?
It's when an RFD tries to swing around the base of the storm, narrowing the area of wind flowing into the updraught and increasing its spin (in the same way figure skaters turn faster when their arms are pulled in) that you might want to get into your getaway car.
To create a supercell, take a storm where wind speed increases with height, while wind direction veers; a situation in which updraughts and downdraughts within the thunderstorm can support each other's existence rather than cancel each other out.
By visual inspection of these variables, evidence of updraughts could be seen in both wind speed and mixing ratio at several locations marked by the grey areas in the figure.
Wind speed anomalies in downdraughts were larger than in updraughts. The amplitude given in Table 4 is a measure of the wind speed anomalies that the rolls give rise to rather than the speed of the roll circulation, which more readily could be given by the latitudinal wind variations.
Clear and correlated patterns of horizontal and vertical wind speed are evident, with lower horizontal wind speed in the updraughts and higher in the downdraughts.
Peak updrafts on YSU PBL are about 4 m/s much weaker than on Shin-Hong (7.5 m/s) and WRF-LES (9 m/s), and the horizontal distance between updraughts is much smaller.
Observations show when water vapour is taken up by the atmosphere through evaporation, the updraughts can either rise to 15 km to form clouds that produce heavy rains or rise just a few kilometres before returning to the surface without forming rain clouds.
The crashes are usually because the land rises imperceptibly into a largely featureless expanse, an area prone to sudden cloud, mist, updraughts and crosswinds.
Updraughts of air lead to rapid movement with ice and water particles rubbing against each leading to a massive build-up of static.
Also on This Day: 1478: Birth of humanist andstatesman Sir Thomas More; 1863: the HMS Orpheus was wrecked on the New Zealand coast with 185 people dying; 1964: the Beatles arrived in America for the first time; 1976: Joan Bazely became the first woman football referee of a male match at Croydon, Surrey; 1989: sardines rained over the Australian town of Ipswich as a violent storm caused updraughts to take the fish from shallow waters into the atmosphere.
How storms develop such immense amounts of electric charge is still not fully understood, but the most likely way is by raindrops carried skywards in updraughts in the clouds.
novelist Charles Dickens; 1886: The richest gold reef in the world was discovered by George Walker, an Englishman, in Transvaal, South Africa; 1989: Sardines rained over the Australian town of Ipswich as violent storms caused updraughts to take the fish from shallow waters into the atmosphere; 1990: An amendment to Article Six of the Soviet Union's constitution, claiming 'full authority to government', announced the first step towards democracy.