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5th November 2007 | 17:05

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2engop

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Joined: Apr 2003

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From: England

Sig Weather Charts

Could someone please tell me what the 2 small perpendicular lines on jet streams indicate? Thanks

5th November 2007 | 17:49

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bookworm

Joined: Aug 2000

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From: UK

It's a change bar. It means that the speed of the jet has changed by 20 knots but either the changes are too close together to show both values clearly, or the software is just being lazy.

5th November 2007 | 17:59

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Gary Lager

Joined: Jan 2005

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From: uk

...or that the altitude of the jet has changed by 3000+.

5th November 2007 | 18:11

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2engop

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From: England

Thanks guys

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