When decoding a METAR, how does sea level pressure (SLP) work?

Question

The METAR for my area states in the remarks section "SLP147=". I'm not sure whether to put a 10 in front or a 9. I also don't get what the equals sign is there for.

Answer 1

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Well, sea level pressure usually ranges from around 950.0mb to 1040.0mb (though the records are 870 and 1080.  So basically if the SLP value is above 500 (50.0) you put a 9 in front and if it is below 400 (40.0) you put a 10.

= means the end.

Source(s): https://en.m.wikipedia.org/wiki/METAR

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• flyingtiggeruk

  Lv 7

  8 months agoReport

  It will be 1014.7
  

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Answer 2

If it's 947 you may wish to get your aircraft under cover.

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