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Question regarding the synoptic chart

  • hellyeah_ravah@hotmail.com
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hellyeah_ravah@hotmail.com created the topic: Question regarding the synoptic chart

Hey everyone.

I've got a relatively easy problem that I'm struggling to get my head around.

The spacing between ISOBARS is 2hpa

The question is "If the pressure at Perth s 1015 HPA, the pressure at LAUNCESTON (LT) would be-

A. 1005 hpa
B. 1007 hpa
C. 1009 hpa
D. 1023 hpa


The answer is B and I was torn between A and B because both ISOBARS are nearly identical in distance to LT. I ended up choosing A because it "simply looked closer".

My question is, is it a thing to take the pressure of the ISOBAR before the location or after it?

Attached is the synoptic chart that was used for the question.

Thanks in advance.
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bobtait replied the topic: Question regarding the synoptic chart

I don't know where you got that chart from, but the spacing of the isobars on a mean sea-level analysis chart is usually 4 hPa. It is quite permissible to interpolate between two isobars if the location is half-way between two isobars. Launceston is halfway between two isobars, so you would normally use a value between the two isobars on either side of Launceston.

Bob
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  • hellyeah_ravah@hotmail.com
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hellyeah_ravah@hotmail.com replied the topic: Question regarding the synoptic chart

Thanks Bob for the clarity.

I have the AFT book which has your content as well as their own, just so happend to be in the AFT area.

Yea unsure why the question is set to 2 hpa when the standard is 4.

Good to know its silly question with unrealistic answers.
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