| Code/Flag Figure |
Description |
Status |
|
0
|
Increasing, then decreasing; atmospheric pressure the same or higher than three hours ago
|
Operational
|
|
1
|
Increasing, then steady; or increasing, then increasing more slowly
(Atmospheric pressure now higher than three hours ago)
|
Operational
|
|
2
|
Increasing (steadily or unsteadily)
(Atmospheric pressure now higher than three hours ago)
|
Operational
|
|
3
|
Decreasing or steady, then increasing; or increasing, then increasing more rapidly
(Atmospheric pressure now higher than three hours ago)
|
Operational
|
|
4
|
Steady; atmospheric pressure the same as three hours ago
|
Operational
|
|
5
|
Decreasing, then increasing; atmospheric pressure the same or lower than three hours ago
|
Operational
|
|
6
|
Decreasing, then steady; or decreasing, then decreasing more slowly
(Atmospheric pressure now lower than three hours ago)
|
Operational
|
|
7
|
Decreasing (steadily or unsteadily)
(Atmospheric pressure now lower than three hours ago)
|
Operational
|
|
8
|
Steady or increasing, then decreasing; or decreasing, then decreasing more rapidly
(Atmospheric pressure now lower than three hours ago)
|
Operational
|
|
9-14
|
Reserved
|
Operational
|
|
15
|
Missing value
|
Operational
|