'Convection Streets' Structure
Blushing to be encountred with a cloud,
Shall I speake for thee?
William Shakespeare, "The Tragedie of Titus Andronicus", Actus Secunda
If in the ground flowing humid air, which is covered with approx. 1.5-2 km high lying inversion layer, turbulent movements appear, then the cloud streets can form into this air.
The emergence of “cloud streets” happened often if the higher air sinks, like e.g. possibly at the high pressure of area (anticyclone) or during the nocturnal ground fog.
The “cloud streets” are observed normally in masses, particularly in the centre of the Pacific in Kiritimati (Christmas Island) area (so-called "Kiritimati Cloud Province") and in/around Arab sea.
Generally, they appear within ±30° band from Equator, in most cases even within ±15°.
This is a spreading type of the cloud structure.
There are cloud street structures, which have the same emergence, but form in middle latitude under strong cold flowing wind above relatively warm water.
Not rare the “cloud streets” structure is observed with the other round-like cloud structure.
| Global occurrence
diagram of 'Convection Streets'
sea-breeze and horizontal convective rolls
Peter S. Dailey and Robert G. Fovell
history of Rolls