Amazing shelf clouds...

A SHELF CLOUD is a type of arcus cloud.

An arcus cloud is a low, horizontal cloud formation associated with the leading edge of thunderstorm outflow, or occasionally with a cold front even in the absence of thunderstorms. Roll clouds and SHELF CLOUDS are the two types of arcus clouds, slight variations in their generation and look being the difference.

[A] shelf cloud is attached to the base of the parent cloud (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 and wind-torn.

Occasionally people seeing a shelf cloud may believe they have seen a wall cloud. This is a common mistake, since an approaching shelf cloud appears to form a wall made of cloud. Generally speaking, a shelf cloud appears on the leading edge of a storm, and a wall cloud will usually be at the rear of the storm.
~source

Yesterday, people shared shelf clouds they've encountered over the summer in the eastern part of the country... My personal best was in South Dakota... I'll share that in a minute...

With permission, here is a shelf cloud that Annie B. encountered during her vacation at Daytona Beach.... when Annie's friend Matt saw that, he shared with her his shot on his south Georgia farm of an awesome shelf in Lenox, GA. He also gave me permission to share...Looks like a scene straight out of the plains, doesn't it? Great shots, guys and thanks for sharing.

Here is my SD shelf cloud... what an amazing experience this was.They look ominous for a reason... they are generally a good indication of some powerful weather coming. Mine incorporated an amazingly powerful sand storm and winds that knocked down a tractor trailer. The other side held tornadic wall clouds... with multiple funnels. If you see something like this approaching, find a safe spot.

Sign of danger
A sharp, strong gust front will cause the lowest part of the leading edge of an arcus to be ragged and lined with rising fractus clouds. In a severe case there will be vortices along the edge with twisting masses of scud that may reach to the ground or be accompanied by rising dust. A very low shelf cloud accompanied by these signs is the best indicator that a potentially violent wind squall is approaching. An extreme example of this phenomenon looks almost like a tornado and is known as a gustnado.

Have a great day and wonderful weekend!
~Dewdrop