8.4.1
The synopses given in part
II of weather and sea bulletins shall have the following content and
order of items:
-
.1
date and time of reference in
UTC;
-
.2
synopsis of major features of
the surface weather chart; and
-
.3
direction and speed of movement
of significant pressure systems and tropical disturbances.
8.4.2
If possible, significant characteristics
of corresponding wave conditions (sea and swell) should be included
in the synopsis as well as characteristics of other sea-surface conditions
(drifting ice, currents, etc.) if feasible and significant.
8.4.3
Significant low-pressure systems
and tropical disturbances which affect or are expected to affect the
area within or near to the valid period of the forecast should be
described; the central pressure and/or intensity, location movement
and changes of intensity should be given for each system; significant
fronts, high-pressure centres, troughs and ridges should be included
whenever this helps to clarify the weather situation.
8.4.4
Direction and speed of movement
of significant pressure systems and tropical disturbances should be
indicated in compass points and metres per second or knots respectively.
8.4.5
Units used for speed of movement
of systems shall be indicated.