What kind of cloud is this?
A roll cloud.
These rare long clouds may form near advancing cold fronts.
In particular, a downdraft from an advancing storm front can cause moist warm air to rise, cool below its dew point, and so form
When this happens uniformly along an extended front, a
roll cloud may form.
may actually have air circulating along the long horizontal axis of the cloud.
A roll cloud is not thought to be able to morph into a
Unlike a similar
a roll cloud, a type of
is completely detached from their parent
roll cloud extends far into the distance in 2009 January
above Las Olas Beach in
Daniela Mirner Eberl