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Old 16th May 2017, 07:47
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peekay4
 
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The 9xx group refers to the 24-hour barometric pressure change in 0.1 hPa increments (similar to the preceeding 5axxx group which is the 3-hour pressure tendency).

So 957 means 5.7 hPa pressure change in the last 24 hours.
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