Air pressure |
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changes in inHg |
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| changes in hPa |
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The horizontal axis represents the last 12 hours air pressure recording
The vertical axis represents the air pressure changes in inHg (+0.12, +0.06, 0,
0.12.The “0” represents the current air pressure). The newly measured pressure was compared to the previously recorded pressure reading. The pressure change
is expressed by the difference between the current ("0h") and the past readings in division of ±2 hPa or ±0.06 inHg. If the bars are rising it indicates that the weather is getting better due to an increase in air pressure. If the bars go down it indicates a drop of the air pressure and the weather is expected to get worse from the present time "0".
At every full hour the current air pressure is used as a basis for the display of a new graph bar. The existing graph is then moved one column to the left.
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