Parse sea level pressure in remarks
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mivek commented
In remarks sea level pressure are encoded SLPppp
where SLP
is the remark identifier and ppp
is the pressure
If ppp
starts with 1, add 10 before ppp
and put a comma before last number
If ppp
starts with 9, add 9 before ppp
and put a comma before last number.
Eg:
- SLP134 => 1013,4
- SLP998 => 999,8
SLPNO
means sea-level pressure is not available