But lenticular clouds
of the type supposedly seen at Gallipoli have frequently been mistaken for UFOs.
, as they are called, are formed when stable moist air flows over mountains.
Though a roll cloud may not be seen, strong chinooks are often accompanied by spectacular multiple-layered standing lenticular clouds
("altocumulus standing lenticular" or ACSL) and a chinook arch, a broad mid-level altocumulus or cirrus cloud extending leeward from the mountains.
Above this drier air layer, there is reasonably responsive air as one will have seen when cloud towers reach these levels and lenticular clouds
form as a cap on the upthrusting cumulus head.
However, scientists say the unusual formations are Lenticular clouds
, which form at high altitudes.
If moisture and temperatures are right, lenticular clouds
can form, but it's more common to simply find small, stratus clouds evenly spaced downwind from the mountain.
Above us, lenticular clouds
are forming, whirling in the cool katabatic winds sweeping off the glaciers.
Weather experts say lenticular clouds
- so-called because of their lens shape - form when certain atmospheric conditions are present.