Clouds – Nuvole


Roll Clouds

A roll cloud is a low, horizontal tube-shaped arcus cloud associated with a thunderstorm gust front, or sometimes a cold front. Roll clouds can also be a sign of possible microburst activity. Cool air sinking air from a storm cloud’s downdraft spreads out across the surface with the leading edge called a gust front. This outflow undercuts warm air being drawn into the storm’s updraft. As the cool air lifts the warm moist air water condenses creating cloud, which often rolls with the different winds above and below (wind shear).

.

.

.

.

.

.

.

Nacreous Clouds

These rare clouds, sometimes called mother-of-pearl clouds, are 15 – 25km (9 -16 miles) high in the stratosphere and well above tropospheric clouds. They have iridescent colours but are higher and much rarer than ordinary iridescent clouds. They are seen mostly but not exclusively in polar regions and in winter at high latitudes, Scandinavia, Alaska, Northern Canada. Lower level iridescent clouds can be seen anywhere.

.

.

.

.

.

.

.

Mammatus Clouds
Mammatus are pouch-like cloud structures and a rare example of clouds in sinking air. Sometimes very ominous in appearance, mammatus clouds are harmless and do not mean that a tornado is about to form – a commonly held misconception. In fact, mammatus are usually seen after the worst of a thunderstorm has passed.


.

.

.

Noctilucent Clouds

Noctilucent Clouds or Polar Mesopheric Clouds: This is an extroadinarily rare cloud formation that occurs out on the verge of space between 82km to 102 km from the earth’s surface. Noctilucent clouds appear to be luminous yet they reflect the sunlight from the other side of the earth at night, giving them a glowing appearance.

.

.

.

.

.

.

.

.

Mushroom Clouds

A mushroom cloud is a distinctive mushroom-shaped cloud of smoke, condensed water vapor, or debris resulting from a very large explosion. They are most commonly associated with nuclear explosions, but any sufficiently large blast will produce the same sort of effect.

Volcano eruptions and impact events can produce natural mushroom clouds.

.

.

.

.

 

Cirrus Kelvin-Helmholtz

Appearing as a slender, horizontal spiral of cloud, cirrus Kelvin-Helmholtz is one of the most distinctive cloud formations. However, it tends to dissipate only a minute or two after forming and, as a result, is rarely observed.

.

.

.

.

Lenticular Clouds

Lenticular clouds, technically known as altocumulus standing lenticularis, are stationary lens-shaped clouds that form at high altitudes, normally aligned at right-angles to the wind direction. Where stable moist air flows over a mountain or a range of mountains, a series of large-scale standing waves may form on the downwind side. Lenticular clouds sometimes form at the crests of these waves. Under certain conditions, long strings of lenticular clouds can form, creating a formation known as a wave cloud.

Lenticular clouds near Mt Adams – by Darlisa Black

.

.

.

.

.

.

.

.

.

.

..

Shelf Clouds

A shelf cloud is a low, horizontal wedge-shaped arcus cloud, associated with a thunderstorm gust front (or occasionally with a cold front, even in the absence of thunderstorms). Unlike a roll cloud, a shelf cloud is attached to the base of the parent cloud above it (usually a thunderstorm). Rising cloud motion often can be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent, boiling, and wind-torn.

.

.

.

.

.

credits:

video youtube:

_______________________

Aggiornamento 23/01/2013:

Sono stato contattato via email dall’autrice di una di queste foto, Darlisa Black, che mi ha, in verità molto gentilmente, ricordato di rispettare i credit dei fotografi che hanno pubblicato tali immagini e che le rendono disponibili su Flickr. In effetti da sprovveduto le ho inserite senza rispetto dei diritti di pubblicazione. Mi ha autorizzato alla pubblicazione ed ecco qui il link alla sua pagina Flickr. Le sue foto sono fantastiche.  Assolutamente da vedere. Grazie Darlisa.

IMG_4422    4:40 pm

http://www.flickr.com/photos/starlisa/

http://www.flickr.com/photos/starlisa/sets/72157613492935029/

3 thoughts on “Clouds – Nuvole

  1. Pardon me, it’s my fault. I have found it on one of the links reported here or on google. Your photos are fantastic. May I ask you for permission now, please? If you aren’t agree I’ll cancel it soon. CIAO
    PS My English is so bad that I am ashamed.

  2. Pingback: Nuvole Mammatus in Michigan | STONEHENGE

Lascia un commento

Inserisci i tuoi dati qui sotto o clicca su un'icona per effettuare l'accesso:

Logo WordPress.com

Stai commentando usando il tuo account WordPress.com. Chiudi sessione / Modifica )

Foto Twitter

Stai commentando usando il tuo account Twitter. Chiudi sessione / Modifica )

Foto di Facebook

Stai commentando usando il tuo account Facebook. Chiudi sessione / Modifica )

Google+ photo

Stai commentando usando il tuo account Google+. Chiudi sessione / Modifica )

Connessione a %s...