reference|http://artefacts.ceda.ac.uk/badc_datadocs/surface/code.html
short_description|Pressure characteristic over last 3 hours
wmo_code|0200
long_description|Characteristic of pressure tendency.
codeTYPE|I
@| Values
0|Increasing, then decreasing: atmospheric pressure the same as or higher than 3 hrs ago
1|Increasing, then steady: atmospheric pressure now higher than 3 hrs ago
2|Increasing (steadily or unsteadily): atmospheric pressure now higher than 3 hrs ago
3|Decreasing or steady, then increasing; or increasing, then increasing more rapidly: atmospheric pressure now higher than 3 hrs ago
4|Steady: atmospheric pressure the same as 3 hrs ago
5|Decreasing, then increasing: atmospheric pressure the same as or lower than 3 hrs ago
6|Decreasing, then steady; or decreasing then decreasing more slowly: atmospheric pressure now lower than 3 hrs ago
7|Decreasing (steadily or unsteadily): atmospheric pressure now lower than 3 hrs ago
8|Steady or increasing, then decreasing; or decreasing, then decreasing more rapidly: atmospheric pressure now lower than 3 hrs ago