Jet Stream

The jet stream consists of ribbons of very strong winds which move weather systems around the globe. Jet streams are found 9-16 km above the surface of the Earth, just below the tropopause, and can reach speeds of 200 mph.


Jetteau

A jet of water. 


Jokulhlaup

Jokulhlaups, or glacial outburst floods (GLOFS) are a key part of the deglaciation of alpine mountains and ice sheet margins. They are a hazard to people and infrastructure, and can cause widespread land form modification through erosion and deposition. These floods occur very suddenly discharge large volumes of water, ice and debris from a glacial source. They can occur anywhere where water accumulates in a sub glacial lake beneath a glacier. The flood is initiated following the failure of an ice or moraine dam.

 


Juvenile Water

 Water brought to the surface or added to underground supplies from magma.