Multi-cell thunderstorm

Multicell thunderstorms are several individually connected thunderstorm cells. The individual
Cells are different. These thunderstorm cells interact with each other,
i.e. the downdraft of a thunderstorm cell promotes the formation of a new cell.

Multi-cell line:
One speaks of a multi-cell line (squallines) when several thunderstorms are in a line
arrange These multi-cell lines can exist for a long time because the downdrafts of the cells along
this line again and again form new cells in the direction of pull. In principle, this is done by
that the cold air from the downdraft pushes under the warm air and lifts it up again.

Derechos:
Derechos are a special form of a multi-cell line, which moves very quickly and has very strong
wind brings. By definition, a multicell is a derecho if it has a
minimum length of 450 km and repeatedly forms strong gusts of wind of at least 93 km/h.

Multicell cluster:
When thunderstorms form a group, it is called a cluster. Such arrangements leave
recognize themselves on the radar image by the fact that they have a very large area and the whole
Cluster on radar or satellite imagery is almost circular in shape.

Such a cluster is commonly called MCS (mesoscale convective system).
if the system has a minimum size of 100,000 square kilometers and a duration of at least
6 hours, one speaks of an MCC (mesoscale convective cluster).