Cold Air Development - Weather Events

by ZAMG and KNMI

Parameter Description

Precipitation

Thunderstorms, rain and hail showers during the whole life cycle.

Temperature

No remarkable changes.

Wind (incl. gusts)

Increasing wind during the development of the Comma to a full-scale vortex.

Other relevant information

In stages of development the Comma tail is more weather active with heavy convective development due to a left exit region of a jet streak.
Convective cells mostly develop within the Comma tail and move to the head where they dissipate.
In a more mature stage different conveyor belts are situated on top of each other and a Cold Front will develop.

	06 March 2009/12.00 UTC - Meteosat 8 IR 10.8 image; blue: weather events

Menu Of Cold Air Development

Typical Appearance In Vertical Cross Sections

References

Parameter	Description
Precipitation	Thunderstorms, rain and hail showers during the whole life cycle.
Temperature	No remarkable changes.
Wind (incl. gusts)	Increasing wind during the development of the Comma to a full-scale vortex.
Other relevant information	In stages of development the Comma tail is more weather active with heavy convective development due to a left exit region of a jet streak. Convective cells mostly develop within the Comma tail and move to the head where they dissipate. In a more mature stage different conveyor belts are situated on top of each other and a Cold Front will develop.