lee wave

In the worst case lee waves appear behind high islands.

This is due to lee waves triggered by hills just upstream of the cloud's formation.

Its location, east of the Sierra Nevada range, favors lee wave formation.

Lee waves provide a possibility for gliders to gain altitude or fly long distances when soaring.

Pilots come to Omarama to experience strong lee wave conditions, ridge soaring and thermal flying.

Many use the expression downburst for this extreme sailing weather condition, but it is certainly more related to lee waves.

Bermuda rigged sailing boats are vulnerable to lee waves.

They are one of many types of wave motion in stratified fluids (another example being Lee waves).

In meteorology, lee waves are atmospheric standing waves.

Long distances are now flown using any of the main sources of rising air: ridge lift, thermals and lee waves.

This is called the Pennine Lee Wave and can appear suddenly and disappear just as quickly.

Five principal types of lift are used: thermals, ridge lift, lee waves, convergences and dynamic soaring.

If the flow is strong enough, turbulent eddies known as "rotors" associated with lee waves may form, which are dangerous to ascending and descending aircraft.

Once launched sailplanes try to gain height using thermals, ridge lift, lee waves or convergence zones and can remain airborne for hours.

The strongest lee waves are produced when the lapse rate shows a stable layer above the obstruction, with an unstable layer above and below.

For his dissertation, he deployed 25 instrumented gliders to gather data on lee waves, the newly discovered features forming downwind of mountains.

All 113 passengers and 11 crew members died in the disaster, which was attributed to extreme clear air turbulence caused by lee waves downwind of the mountain.

Downwind of the hill, lee waves can form that are also used by glider pilots to gain height but this should not be confused with slope lift.

The group plans particularly to study lee wave clouds, clouds of ice particles that form downwind of mountain peaks, in Scandinavia and the Urals.

'Speed to fly' is a principle used by Gliding pilots when flying between sources of lift, usually thermals, ridge lift and Lee waves.

A foehn wall cloud may exist at the lee side of the mountains, however this is not a reliable indication of the presence of lee waves.

In the Northern hemisphere, the generation of lee waves by mountains may locally cool the lower stratosphere and lead to the formation of PSCs.

The records were set in the Sierra Nevada lee wave between Mojave, California and Inyokern, California.

Lenticular clouds are stationary lens-shaped clouds that are formed downwind of mountains by lee waves if the air mass is close to the dew point.

In the early 1950s, Kuettner came to the United States and joined the Sierra Wave Project as scientific field director, investigating lee waves in California.