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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Weather News

Earthquake felt in Darwin

14:13 EST

A powerful magnitude 7.2 earthquake located in the Banda Sea, near Indonesia, could be felt across Darwin on Monday afternoon.

South Australia's lowest temperature in seven years

08:32 EST

Getting out of bed on Monday morning was harder than usual in South Australia, with the state registering its lowest temperature since 2012.

Queensland graziers still counting costs of flood devastation

17:19 EST

The oars were missing and the rowboat had a hole in it but Ron Cook tied it to the verandah of the farmhouse and planned his escape.