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## Synoptic charts and measuring QNH

• rodcarey
• Topic Author

### rodcarey created the topic: Synoptic charts and measuring QNH

Hi all,

Just wonder where on the synoptic chart you take the QNH measurement Ie in the middle of either a low or high is the QNH measurement, each gradient line after that has a value which is on the line. I have attached a sample for Melbourne, the high is 1024, and the next gradient line is 1016. Melbourne sits north of the Gradient line, between 1016 and 1024. I would assume the gradient line 1016, and the area between this and 1024 is all a QNH of 1016, and once you hit the gradient line around the high, then it would become 1024?