[Jason Smith]

Please upload your photos/images of various Convective Accessory clouds and weather you have for the Library. This section includes basically any accessory clouds, phenomenon resulting from a thunderstorm, ranging from roll clouds, the whales mouth, lightning, hail etc, apart from funnels/tornadoes.

This link can help to a certain extent with your cloud identification.

http://amsglossary.a...ss.com/glossary

[Andy Ball]

MAMMA (Mammatus)

This type of cloud feature forms under most convective clouds but is most dramatic under large CB clouds. The cloud consists of bulges which is where the mamma comes from (latin for udder), and is formed when a downdraft carries cold air down into the warmer layer causing it to cool rapidly and form water droplets, causing an upside down type of convection. You can see this type of cloud under any 'us' (i.e Cirrocumulus, the 'us' part is put on all types that are convective) cloud but in smaller clouds is usually distorted or not that visually amazing, but can look very spectaular under the back edge or side of a thunderstorm anvil. They can occur at any levels from very low to very high in the atmosphere, the anvil picture below demonstrates how it can form very high up in the atmosphere on the leading edge of a developing anvil.

Here are some of my picture(s) of this cloud:

[Si Taylor]

Lightning

Captured on July 2nd 2006 using a Minolta A200 Camers on ISO 50, F11 and a two second exposure.

[Si Taylor]

Mammatus

Captured in April 2006 on the visit to the Peaks.

 

[Paul Corfield]

Photo I took June 2005 from Poole.

[Conor]

Hail

[PaulKn]

Wall cloud

South Dakota - May 20th 2005.

[John Mason]

More mammatus....

Cheers - John 

[ozzie]

Here are some CG strikes of storm that hit us in the early hours of 27/7/06

[trogdor]

Lightning + mammatus, south of France 13th of July 2006

[Stuart_W]

Gust Front. Stamford, Lincolnshire, UK. 22 July 2006

[RichC]

Lightning taken in 2006 during a violent thunderstorm over Tiverton.

[RichC]

Mammatus with Rainbow over Tiverton in Dec 06.

[Jane B]

Roll Cloud. 19th July 2007.

[Linda Bennett]

Gust Front (Roll Cloud)

[Dan C]

Taken 28/08/07 Looking East Towards Bedfordshire

[Linda Bennett]

ROLL CLOUD (by Paul Hunter)

[thunder god]

Hail Storm.







Cone shaped hail

[Linda Bennett]

Pileus (cap cloud) by Rob Noble

[Weatherboy11]

Shelf cloud from Gust Front 17/07/07