Billow cloud: Difference between revisions
From Glossary of Meteorology
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{{Term | |||
|Display title=billow cloud | |||
{{ | |Definitions={{Definition | ||
|Num=1 | |||
|Meaning=Popular name for [[undulatus]]. | |||
|Explanation=Some forms are the result of [[shear instability]] ([[Kelvin–Helmholtz instability|Kelvin–Helmholtz]]), and some result from [[gravity waves]]. Billow clouds are present when there is sufficient moisture present in the upward motion of the waves to make the [[wave]] structure visible by [[condensation]] of [[cloud droplets]]. Billows formed from gravity waves exhibit broad, nearly parallel, lines of [[cloud]] oriented normal to the [[wind direction]], with cloud bases near an [[inversion]] surface. The distance between billows is on the order of 1000–2000 m. | |||
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Latest revision as of 22:04, 13 January 2024
Popular name for undulatus.
Some forms are the result of shear instability (Kelvin–Helmholtz), and some result from gravity waves. Billow clouds are present when there is sufficient moisture present in the upward motion of the waves to make the wave structure visible by condensation of cloud droplets. Billows formed from gravity waves exhibit broad, nearly parallel, lines of cloud oriented normal to the wind direction, with cloud bases near an inversion surface. The distance between billows is on the order of 1000–2000 m.
