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Pressure Trend
| Code | Symbol | Description |
|---|---|---|
| 0 |
|
increasing, then decreasing
athomspheric pressure the same as or higher than 3 hours ago |
| 1 |
|
increasing, then steady or increasing, then increasing more slowly
athomspheric pressure now higher than 3 hours ago |
| 2 |
|
increasing (steadily or unsteadily)
athomspheric pressure now higher than 3 hours ago |
| 3 |
|
decreasing or steady, then increasing or increasing, then increasing more rapidly
athomspheric pressure now higher than 3 hours ago |
| 4 |
|
steady
athomspheric pressure the same as 3 hours ago |
| 5 |
|
decreasing, then increasing
athomspheric pressure the same as or lower than 3 hours ago |
| 6 |
|
decreasing, then steady or decreasing, then decreasing more slowly
athomspheric pressure now lower than 3 hours ago |
| 7 |
|
decreasing (steadily or unsteadily)
athomspheric pressure now lower than 3 hours ago |
| 8 |
|
steady or increasing, then decreasing or decreasing, then decreasing more rapidly
athomspheric pressure now lower than 3 hours ago |
