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Billow clouds are created from instability associated with flows having marked vertical shear and weak thermal stratification. The common name for this instability is Kelvin-Helmholtz instability. One may visualize these instabilities as a row of horizontal eddies aligned within this layer of vertical shear.
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ww2010.atmos.uiuc.edu/(Gl)/guides/mtr/cld/oth/kh.rxml
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Kelvin-Helmholtz instability causes 'billow clouds', a system that is very dangerous, rare photograph by Kay Ekwall ... The common name for these clouds which resemble waves of the ocean breaking on the shore is "Billow Clouds". They result from a shearing instability formally called dynamic instability (or Kelvin...
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www.mtshastaphotography.com/R1n1.htm
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Kelvin Helmholtz Instability (KHI) is a natural phenomena described by Lord Kelvin and Hermann von Helmholtz. When KHI plays a role in the atmosphere, ...
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weather.about.com/od/cloudsandprecipitation/p/KelvinHel...
weather.about.com/od/cloudsandprecipitation/p/KelvinHelmholtz.htm
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small-scale eddies can be formed by a number of processes in the atmosphere: ... wind shear along the shear zone can generate eddies that are sometimes visible as billow clouds...
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apollo.lsc.vsc.edu/classes/met130/notes/chapter9/edd_sh...
apollo.lsc.vsc.edu/classes/met130/notes/chapter9/edd_shearzone.html
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While observing the contrail shadows on 29 October (see above) billow clouds were apparent in the northeast, in altostratus or altocumulus, as a front was approaching, and the wind seemed to be southwesterly, but I did not take care to notice the winds at higher levels.
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www.du.edu/~jcalvert/astro/skyobs.htm
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Clouds are classified into a system that uses Latin words to describe the appearance of clouds as seen by an observer on the ground. The table below summarizes the four principal components of this ... Other Cloud Types; Cloud types include: contrails, billow clouds, mammatus, orographic and pileus clouds.
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www.cartage.org.lb/en/themes/Sciences/Earthscience/Hydr...
www.cartage.org.lb/en/themes/Sciences/Earthscience/Hydrology/Meteorology/CloudsPrecipitation/CloudTypes/CloudTypes.htm
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A glance into the sky during early morning or late afternoon often reveals clouds arranged in parallel bands (figure 1). The observer lucky enough to see such clouds from the side may ... Ludlam, F.H., 1967, "Characteristics of billow clouds and their relation to clear air turbulence", Q. J. R. Met. Soc. 93, 419-435.
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salty.oce.orst.edu/Patch_summary.html
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Clouds form when the relative humidity reaches or exceeds 100%. The relative humidity is the ratio of the amount of water vapor in the air compared with the amount of water vapor that is possible to exist in the air.
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www.inclouds.com/Wx/
www.inclouds.com/Wx/
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billow clouds pictures, videos, images and albums from Webshots. ... Clouds billow over the fields ... The Sun is setting in these Billow Clouds...
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outdoors.webshots.com/explore/billow/clouds
outdoors.webshots.com/explore/billow/clouds
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