Fairfax Media Network

Weather Glossary - J

Search

Jet max

(Speed Max, Jet Streak) A point or area of relative maximum wind speeds within a jetstream.

Jet streak

A local wind speed maximum within a jetstream.

Jetstream

Relatively strong winds concentrated in a narrow stream in the atmosphere, normally referring to horizontal, high-altitude winds. The position and orientation of jetstreams vary from day to day. General weather patterns (hot/cold, wet/dry) are related closely to the position, strength and orientation of the jetstream (or jetstreams). A jetstream at low levels is known as a low level jet.

JTWC

Joint Typhoon Warning Center. The JTWC issues warnings and forecasts for tropical systems across the Pacific and Indian Oceans.

Display Your Local Weather

Weather News

NSW Upper Western wades through a wet winter

17:44 EST

Much of the state has seen great rainfall over winter, with only the north and central coast missing out.

Snow falls on WA's Bluff Knoll for second time in weeks

17:21 EST

Snow has fallen in Western Australia's Stirling Ranges, including Bluff Knoll, for the second time in a matter of weeks, after a chilly night in the Great Southern.

First day of spring: Change of seasons springs to life in photos

16:20 EST

Amateur photographers have been all too happy to bid farewell to winter in stunning style, capturing picture-perfect shots of the first day of spring from around the country.