Hong Kong Observatory Brand Hong Kong - Asia's world city
GovHK Traditional Chinese Simplified Chinese Search
Search Site Map Contact Us
Print Version
Back

Print Version PDF Version

What is Windshear?

Windshear is a sustained change (i.e. lasting more than a few seconds) in headwind or tailwind resulting in changes in the lift to the aircraft. A decreased lift will cause the aircraft to go below the intended flight path. A change of 15 knots or more in headwind or tailwind is considered significant windshear which may require timely and appropriate corrective action by the pilot.

Schematic diagram of windshear

 2003 | Important notices | Privacy policy Last revision date: <15 Aug 2011>