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Mystery Lab / Observation & interpretation

The air passes through. Why can the cloud seem fixed?

Move the same air marker to three positions and compare the cloud’s location. Then hold the wave path fixed while changing the moisture assumption.

Observation & interpretation · two guided observations

Why explore a saucer-like cloud with an air marker?

A lenticular cloud has a lens- or smooth saucer-like form. In wave flow behind mountains, air can keep passing through while a persistent region of forming and evaporating droplets makes the cloud seem fixed.

First move the same air marker to before cloud entry, near the crest and after exit. Compare its small dots with the cloud region’s location. Next hold the wave path fixed and change whether sufficient moisture for cloud formation is assumed.

① Check whether the cloud region stays in place while the air marker moves. ② Check whether the cloud display changes with the moisture assumption while the wave path stays fixed.

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Continue with the story and its records

Explore how the difference you noticed connects with the surviving records of the historical story.

Read about lenticular clouds and moving air
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Sources and scope

WMO’s classification defines the scope of the name. National Weather Service explanations, its 2003 case account and UBC’s teaching material distinguish moving air from the region where cloud forms.

  1. 01
    Lenticularis · International Cloud Atlas World Meteorological Organization · 2017 edition · Checked 2026-10-22
  2. 02
    Altocumulus Standing Lenticular Clouds NOAA · National Weather Service, Albuquerque · Checked 2026-10-22
  3. 03
    ATSC 113 · Special Clouds: Lenticular Clouds University of British Columbia · Earth, Ocean and Atmospheric Sciences · Checked 2026-10-22
  4. 04
    Lenticular Clouds · Big Island, November 25, 2003 NOAA · National Weather Service, Honolulu · Checked 2026-10-22

The prose and explanatory diagrams are original. No cloud photograph, satellite image, institutional diagram, scan or logo is reproduced or traced. The assigned curve and cloud region explain a relationship; they calculate no real temperature, humidity, wind, height, time or droplet count and do not diagnose an image.