Atmospheric pressure is observed (measured) to the nearest tenth of a mbar or a tenth of a hPa.. That's five digits. Standard atmospheric pressure is 1013.25 mbar or 101.325 kPa or 1013.25 hPa.
Hope this clarifies.
Stan Doore
This may seem to be contradictory, or at least, paradoxal. The explanation is that 1013.25 hPa would be transmitted on the aeronauical weather network simply as 01325, while 995.67 hPa would be transmitted as 99657. Since these are transmitted in a standard format there is no need of explanation or decimal point.
-- Joseph B. Reid 17 Glebe Road West Toronto M5P 1C8 Telephone 416-486-6071
