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Chapter 4 ________________________________________________________________ Operation
VAISALA _______________________________________________________________________ 63
Pressure tendency graphics and codes:
The characteristic symbols of pressure tendency during the 3 hours
preceding the time of observation are described as follows:
0604-055
Figure 40 Pressure Tendency Description
where:
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
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