Weather Glossary - J

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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.

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Sydney temperatures to plummet tonight as 'deceptive' cold front moves through NSW

19:34 EST

A fast-moving storm has hit Sydney and the Illawarra region, with winds hitting more than 100 kilometres per hour.

Snow blankets central Victoria as Ballarat records coldest September day in more than 50 years

19:13 EST

Victorians have been left shivering by an Antarctic blast that swept across the state, bringing significant snowfalls and the coldest September day in more than half a century to the regional city of Ballarat.