by APOD Robot » Sun Aug 20, 2023 4:06 am
A Roll Cloud Over Wisconsin
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 here, a
roll cloud extends far into the distance as a storm approaches in 2007 in
Racine,
Wisconsin, USA.
[url=https://apod.nasa.gov/apod/ap230820.html] [img]https://apod.nasa.gov/apod/calendar/S_230820.jpg[/img] [size=150]A Roll Cloud Over Wisconsin[/size][/url]
[b] Explanation: [/b] What kind of cloud is this? A type of [url=https://en.wikipedia.org/wiki/Arcus_cloud]arcus cloud[/url] called a [url=https://epod.usra.edu/blog/2011/11/roll-cloud-shelf-cloud.html]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=https://en.wikipedia.org/wiki/Dew_point]dew point[/url], and so form [url=https://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=https://apod.nasa.gov/apod/ap090824.html]Roll clouds[/url] may actually have air circulating along the [url=https://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=https://apod.nasa.gov/apod/ap050613.html]tornado[/url]. Unlike a similar [url=https://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-Racine.jpg]Pictured here[/url], a [url=https://epod.usra.edu/blog/2006/04/lovelock-roll-cloud.html]roll cloud[/url] extends far into the distance as a storm approaches in 2007 in [url=https://youtu.be/b2ezPLnsRxk]Racine[/url], [url=https://en.wikipedia.org/wiki/Wisconsin]Wisconsin[/url], USA.
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