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

Cyclone Esther expected to form in Gulf overnight near NT-Queensland border

17:54 EDT

The Bureau of Meteorology (BOM) says Tropical Cyclone Esther is expected to form overnight and pass close to the tiny Northern Territory community of Robinson River on Monday.

Flooding rain spreads west across southern and central Queensland inland

16:47 EDT

More heavy rain is possible across Queensland's southern and central inland areas today in the wake of severe storms leading to flash flooding overnight.

Twin tropical cyclones odds on for northern Australia

15:17 EDT

Two active tropical cyclones are a high chance over northern Australian waters on Monday.