by APOD Robot » Sun Jun 12, 2016 4:11 am
A Roll Cloud Over Uruguay
Explanation: What kind of cloud is this? A type of
arcus cloud called a
roll cloud. These rare long clouds may form near advancing cold fronts. In particular, a downdraft from an advancing storm front can cause moist warm air to
rise, cool below its
dew point, and so form
a cloud. When this happens uniformly along an extended front, a
roll cloud may form.
Roll clouds may actually have air circulating along the
long horizontal axis of the cloud. A
roll cloud is not thought to be able to morph into a
tornado. Unlike a similar
shelf cloud, a roll cloud is completely detached from their parent
cumulonimbus cloud.
Pictured above, a
roll cloud extends far into the distance in 2009 January above Las Olas Beach in
Maldonado,
Uruguay.
[/b]
[url=http://apod.nasa.gov/apod/ap160612.html][img]http://apod.nasa.gov/apod/calendar/S_160612.jpg[/img] [size=150]A Roll Cloud Over Uruguay[/size][/url]
[b] Explanation: [/b] What kind of cloud is this? A type of [url=http://en.wikipedia.org/wiki/Arcus_cloud]arcus cloud[/url] called a [url=http://news.nationalgeographic.com/news/2013/11/131115-rare-roll-cloud-video-rare-morning-glory/]roll cloud[/url]. These rare long clouds may form near advancing cold fronts. In particular, a downdraft from an advancing storm front can cause moist warm air to [url=http://neveryetmelted.com/wp-content/uploads/2013/09/LaundryCat.gif]rise[/url], cool below its [url=http://en.wikipedia.org/wiki/Dew_point]dew point[/url], and so form [url=http://www.youtube.com/watch?v=hKI2Atj08Xk]a cloud[/url]. When this happens uniformly along an extended front, a [url=http://en.wikipedia.org/wiki/Roll_cloud]roll cloud[/url] may form. [url=http://apod.nasa.gov/apod/ap090824.html]Roll clouds[/url] may actually have air circulating along the [url=http://apod.nasa.gov/apod/ap060117.html]long horizontal axis[/url] of the cloud. A [url=http://www.weatherscapes.com/album.php?cat=clouds&subcat=roll_cloud]roll cloud[/url] is not thought to be able to morph into a [url=http://apod.nasa.gov/apod/ap130717.html]tornado[/url]. Unlike a similar [url=http://apod.nasa.gov/apod/ap080122.html]shelf cloud[/url], a roll cloud is completely detached from their parent [url=http://ww2010.atmos.uiuc.edu/(Gh)/guides/mtr/cld/cldtyp/vrt/cb.rxml]cumulonimbus[/url] cloud. [url=http://commons.wikimedia.org/wiki/File:Roll-cloud.JPG]Pictured above[/url], a [url=http://epod.usra.edu/blog/2006/04/lovelock-roll-cloud.html]roll cloud[/url] extends far into the distance in 2009 January above Las Olas Beach in [url=http://en.wikipedia.org/wiki/Maldonado_Department]Maldonado[/url], [url=http://en.wikipedia.org/wiki/Uruguay]Uruguay[/url].
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