Notation	Name	Description	Status
0	Increasing, then decreasing; atmospheric pressure the same or higher than three hours ago		stable
1	Increasing, then steady; or increasing, then increasing more slowly		stable
2	Increasing (steadily or unsteadily)		stable
3	Decreasing or steady, then increasing; or increasing, then increasing more rapidly		stable
4	Steady; atmospheric pressure the same as three hours ago		stable
5	Decreasing, then increasing; atmospheric pressure the same or lower than three hours ago		stable
6	Decreasing, then steady; or decreasing, then decreasing more slowly		stable
7	Decreasing (steadily or unsteadily)		stable
8	Steady or increasing, then decreasing; or decreasing, then decreasing more rapidly		stable
15	Missing value		stable