Moderate gale - 50-60km/h, sets whole trees in motion
Fresh gale - 61-73km/h, breaks twigs from trees
Strong gale - 74-86km/h slight damage to buildings ie rooftops/chimneys
Whole gale - 87-100km/h, uproots trees and causes structural damage to buildings
Winds in excess of 100km/h are classed as storms and capable of causnig widespread damage to buildings and infrastructue - these are rare in the UK but they cause widespread disruption for a short period of time.
Wind speeds above 120km/h are unlikely to be experienced in the British Isles. Storms of such a magnitude are classified as hurricanes. Every year gales are expected to result in short term disruption to transport and power supplie but such damage is usually minor
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