Thermobaric cloud

Thermobaric clouds are a hazardous type of gaseous formation, which can be extremely dangerous to starship navigation.

Noted Encounters:

The region of space known as the Delphic Expanse was surrounded by a thick layer of thermobaric clouds.

• This made it extremely difficult for ships to enter and exit the area, and it took at least six hours to traverse at sublight velocities.

In 2153, a Vulcan starship attempted to chart the thermobaric perimeter of the Expanse.

• After several days, the Vulcans encountered a subspace eddy, and were pulled inside.

Later in 2153, the Enterprise penetrated the Expanse's perimeter in a mission to locate the Xindi.

• While inside the thermobaric clouds, the Enterprise was attacked by the Klingons

• The thermobaric clouds prevented the Klingons from getting a weapons lock on the Starfleet ship

The thermobaric clouds surrounding the Delphic Expanse dissipated in 2154, upon the destruction of the Sphere network that was responsible for the unusual properties of that area of space.