Vaisala PTB330 User Manual
Page 52
USER'S GUIDE____________________________________________________________________
50 __________________________________________________________________ M210855EN-D
Figure 31
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
6
=
Decreasing, then steady; or decreasing, then decreasing more
slowly; atmospheric pressure now lower than three hours ago
7
=
Decreasing (steadily or unsteadily); atmospheric pressure now
lower than three hours ago
8
=
Steady or increasing, then decreasing; or decreasing then
decreasing more rapidly; atmospheric pressure now lower
than three hours ago
Source: The World Meteorological Organization (WMO) publication
Manual on Codes Vol. 1.1, International Codes, Part A -
Alphanumerical Codes, 1995 Edition, WMO - No. C, Code Table
0200:a.