Shelf cloud
A shelf cloud is a low, horizontal, wedge-shaped arcus cloud. A shelf cloud is attached to the base of the parent cloud, which is usually a thunderstorm cumulonimbus, but could form on any type of convective clouds. Rising cloud motion can often be seen in the leading (outer) part of the shelf cloud, while the underside often appears turbulent and wind-torn. More… Cool, sinking air from a storm cloud’s downdraft spreads out across the land surface, with the leading edge called a gust front. This outflow cuts under warm air being drawn into the storm’s updraft. As the lower and cooler air lifts the warm moist air, its water condenses, creating a cloud which often rolls with the different winds above and below (wind shear).

Ready for impact by Francesco Dalla Stella
Early stage of a turbulent shelf cloud causing a sinister twilight to fall shortly before the most violent storm ever seen takes place

Magnificent shelf cloud over Riccione beach by Francesco Gennari
A great ending of an intense chasing day in Romagna.

Shelf cloud arriving at Riccione beach by Francesco Gennari
Panoramic view of shelf cloud arriving at Riccione beach, driven by strong winds and illuminated by sunset.

Awesome supercell and shelf cloud by Bruno Gonçalves
Supercell and shelf cloud captured in Maljamar, New Mexico.

Impressive shelf cloud over North Germany by Marius Block
Shelf cloud over North Germany at the coast of the Baltic Sea near the lighthouse.

Morning shelf cloud over the Island of Pag by Danijel Palčić
Beautiful storm structure over the Island of Pag

A small shelf cloud in Lido di Camaiore by Samuele Montedoro
A storm approaching Versilia, with its small shelf cloud

Stunning shelf cloud by Lukas Gallo
Panoramic view at the stunning shelf cloud near Bernartice

Sunset shelf cloud at Lake Red Rock by Mark De Bruin
Amazing shelf cloud at Lake Red Rock, Iowa at sunset

Approaching storm with a shelf cloud by Danijel Palčić
Mesmerizing shelf cloud near Island of Pag

Shelf cloud and double rainbow at Trutnovsko by Filip Petržílek
A beautiful view of an incoming and very photogenic storm from Poland

A beautiful shelf cloud at sunset by Maja Kraljik
The initial stage of formation before this beautiful shelf cloud grew into a beautiful monster

Beautiful shelf cloud and lightning by Danijel Palčić
Arrival of the beautiful shelf cloud and associated storm system to the southern part of the island of Pag

Surprising shelf cloud by Danijel Palčić
Nice Christmas surprise in front of Novalja

Clash of thunderstorms by Samuele Pincelli
Clash between two storms under a single shelf cloud

Shelf cloud over the rice fields by Alessandro Piazza
Squall line storm passing over Vercelli

Mammoth shelf cloud by Samuele Pincelli
A mammoth cloud immortalized for my birthday behind the house

Amazing shelf cloud near Wakita by Maurizio Signani
Shelf cloud captured near Wakita, Oklahoma

Frightening Halloween shelf cloud by Walter Rose
Amazing storm structure in the Halloween afternoon

A very close cloud to ground negative lightning strike on a unicell by Filip Petržílek
A beautiful view of an incoming and very photogenic storm from Poland

Lines by Sütő Máté
One of my favourite chases in 2020. Two HP supercells and this spectacular shelf cloud.

Stunning shelf cloud in South Bohemia by Lukas Gallo
This stunning shelf cloud was captured near Bernartice, South Bohemia region in Czechia