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APPENDIX J ____________________________________________________PRESSURE TENDENCY

VAISALA ________________________________________________________________________ 101

APPENDIX J PRESSURE TENDENCY

The World Meteorological Organization (WMO) publication Manual on Codes

Vol. I.1, International Codes, Part A - Alphanumerical Codes, 1995 Edition,

WMO - No. 306. Section C, Code Table 0200: a - Characteristic of pressure

tendency during the 3 hours preceding the time of observation describes the

pressure tendency as follows:

Code figure

0 Increasing, then decreasing; atmospheric

pressure the same or higher than three hours

ago

1 Increasing, then steady; or increasing, then

increasing more slowly; atmospheric pressure

now higher than three hours ago

2 Increasing (steadily or unsteadily);

atmospheric pressure now higher than three

hours ago

3 Decreasing or steady, then increasing; or

increasing then increasing more rapidly;

atmospheric pressure now higher than three

hours ago

4 Steady; atmospheric pressure the same as

three hours ago

5 Decreasing, then increasing; atmospheric

pressure the same or lower than three hours

ago

6 Decreasing, then steady; or decreasing, then

decreasing more slowly; atmospheric pressure

now lower than three hours ago

7 Decreasing (steadily or unsteadily); atmospheric pressure now lower than

three hours ago

8 Steady or increasing, then decreasing; or decreasing then decreasing

more rapidly; atmospheric pressure now lower than three hours ago

In addition to this the PTB220 series barometers output code * when the

pressure tendency has not yet been calculated i.e. less than three hours have

elapsed since power-up of the barometer. The absence of the pressure trend is

indicated in the similar manner, too.

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Vaisala PTB220 Series Guía de usuario Pagina 107