Why do they seem to stay still?

Cloud forms where air rises and vanishes where it sinks

Lenticular Clouds Quiz: UFO-Shaped Clouds Over Mountains

This lenticular clouds quiz looks up at smooth, saucer-shaped clouds parked over mountain peaks. Play 10 interactive questions on stable moist air flowing over mountains, standing waves downwind, clouds that stay put while wind blows through them, stacked layers like plates, frequent UFO reports, caps on Mount Rainier and Mount Fuji and glider pilots who soar on wave lift.

Start Lenticular Clouds Quiz

🎯 Daily Trivia Challenge • 🧠 10 Questions • ⏱️ 150 Seconds

Question 1 / 10 Time: 150s

Shape
What shape are lenticular clouds?
Where
Where do they usually form?
Waves
What forms downwind of mountains to make them?
Air
What kind of air helps them form?
Still
Why do they seem to stay still?
Stack
What do stacked lenticular clouds look like?
UFO
Why are they often reported as UFOs?
Rainier
Which US mountain often wears lenticular caps?
Fuji
Which Japanese mountain is famous for cap clouds?
Gliders
Who uses mountain wave lift?

Explanations: answer key for all 10 questions

Q1: What shape are lenticular clouds?
Answer: Lens or saucer-shaped
Lenticular means lens-like.
Q2: Where do they usually form?
Answer: Near or over mountains
Mountains create waves.
Q3: What forms downwind of mountains to make them?
Answer: Standing waves in the air
Air rises and falls like ripples.
Q4: What kind of air helps them form?
Answer: Stable, moist air
Strong winds flow over peaks.
Q5: Why do they seem to stay still?
Answer: Cloud forms where air rises and vanishes where it sinks
The wind can be strong.
Q6: What do stacked lenticular clouds look like?
Answer: A pile of plates
Layers form at different heights.
Q7: Why are they often reported as UFOs?
Answer: Their smooth saucer shape
They look unearthly.
Q8: Which US mountain often wears lenticular caps?
Answer: Mount Rainier
It is in Washington State.
Q9: Which Japanese mountain is famous for cap clouds?
Answer: Mount Fuji
Locals read them as weather signs.
Q10: Who uses mountain wave lift?
Answer: Glider pilots
It can carry gliders very high.

Saucers in the Sky

Lenticular clouds are smooth, lens or saucer-shaped clouds that form near mountains. When stable, moist air flows over a mountain, it sets up standing waves downwind, like ripples in a stream. Where air rises in a wave, it cools and forms cloud; where it sinks, the cloud evaporates.

Because cloud forms and vanishes in the same places, lenticular clouds seem to stay still even when strong winds blow through them. Sometimes they stack at different heights like a pile of plates. Their smooth saucer shapes often lead to UFO reports.

Mount Rainier in Washington and Mount Fuji in Japan often wear lenticular caps, which locals read as weather signs. Glider pilots use mountain wave lift to soar very high, setting altitude records in these smooth rising currents.

What This Quiz Teaches

Weather fans will enjoy these questions.

What lenticular clouds look like
How they form
Why they stay put
Where they appear
Who uses the waves

Did You Know?

Turbulence can lie beneath them.
Sunsets turn them pink and gold.
They can signal approaching weather.
Pilots of small planes avoid wave rotors.
Photographers time-lapse them.