At what height do clear sky bumps often occur?

Clear sky bumps mostly occur above 7000 meters above sea level.

Clear-sky turbulence refers to turbulence encountered outside convective clouds. Clear-sky bumps include bumps in or near cirrus clouds, lenticular clouds, and clear-sky bumps near thunderstorms in some cases, excluding bumps caused by thunderstorms, low-level inversion layers, thermal effects or topographic features. Usually, the clear sky bumps will occur at a height of more than 7000 meters, which has nothing to do with strong convective activities.

Its occurrence is not accompanied by obvious weather phenomena, and there is no obvious boundary between bumpy area and non-bumpy area, which is difficult for pilots to detect. With the temperature rising and the arrival of summer, the number of bumps in flight will also increase. At this time of year, many passengers and crew members are injured by air bumps. If you encounter strong turbulence, the plane may descend hundreds of meters in a few seconds, so you need to fasten your seat belt all the way when you take the plane.

Measures to prevent aircraft from bumping;

1, meteorological information analysis.

In the pre-preparation stage before flight, the crew should know the weather change trend of flight route and landing airport, the distribution of thunderstorm and air injection area, and the turbulence index of each waypoint. This chart is used to predict the turbulence intensity in this area, so as to understand the possible bad weather effects and plan the flight route according to the flight plan.

2, pre-flight cooperation

Before the flight, the crew will obtain the weather information of relevant routes, destinations, departure places and alternate airports from the air traffic control meteorologists. And inform the flight weather of the crew, inform the bumpy area, predict the arrival time after take-off, the early warning signal of bumps, the operation requirements of the crew when bumps occur, and clarify the corresponding treatment plan for passengers who are seriously bumped.

3. Radar monitoring in flight

Airborne radar on aircraft is a fully automatic radar, which can display important meteorological information in all areas at any time without clutter and the influence of aircraft attitude without the need for pilots to input scanning angle and set gain.

For unpredictable bumps, the flight crew will always refresh. Once entering the bumpy state, the passengers in the cabin will be reminded by the seat belt bell at the first time, and related actions such as deceleration will be carried out; When the turbulence is too strong or lasts for a long time, the pilot will also find a stable area by changing the flight altitude and changing the flight route.