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indicated by using the abbreviations "FM" and "TL", respectively,
with their associated time groups. When the change
is forecast to commence at the beginning of the trend forecast
period but be completed before the end of that period, the
abbreviation "FM" and its associated time group shall be omitted
and only "TL" and its associated time group shall be used.
When the change is forecast to begin during the trend forecast
period and be completed at the end of that period, the abbreviation
"TL" and its associated time group shall be omitted and
only "FM" and its associated time group shall be used. When
the change is forecast to occur at a specified time during the
trend forecast period, the abbreviation "AT" followed by its
associated time group shall be used. When the change is forecast
to commence at the beginning of the trend forecast period
and be completed by the end of that period or when the change
is forecast to occur within the trend .forecast period but the
time is uncertain, the abbreviations "FM, "TL" or "AT" and
their associated time groups shall be omitted and the change
indicator "BECMG" shall be used alone.
2.3.3 The change indicator "TEMPO shall be used to
describe forecast temporary fluctuations in the meteorological
conditions which reach or pass specified values and last for a
period of less than one hour in each instance and, in the aggregate,
cover less than one-half of the period during which the
fluctuations are forecast to occur. The period during which the
temporary fluctuations are forecast to occur shall be indicated,
using the abbreviations "FM" andlor "TL", as appropriate,
each followed by a time group in hours and minutes. When the
period of temporary fluctuations in the meteorological conditions
is forecast to begin and end wholly within the trend
forecast period, the beginning and end of the period of temporary
fluctuations shall be indicated by using the abbreviations
"FM" and "TL", respectively, with their associated time
groups. When the period of temporary fluctuations is forecast
to commence at the beginning of the trend forecast period but
cease before the end of that period, the abbreviation "FM" and
its associated time group shall be omitted and only "TL" and
its associated time group shall be used. When the period of
temporary fluctuations is forecast to begin during the trend
forecast period and cease by the end of that period, the
abbreviation "TL" and its associated time group shall be omitted
and only "FM and its associated time group shall be used.
When the period of temporary fluctuations is forecast to commence
at the beginning of the trend forecast period and cease
by the end of that period, both abbreviations "FM and "TL"
and their associated time groups shall be omitted and the
change indicator "TEMPO" shall be used alone.
2.4 Use of the probability indicator
The indicator "PROB" shall not be used in trend forecasts.
3. CRITERIA RELATED TO FORECASTS FOR
TAKE-OFF
3.1 Format of forecasts for take-off
Recommendation.- The format of the forecast should be
as agreed between the meteorological authority and the operator
concerned. The order of the elements and the terminology,
units and scales used in forecasts for take-off should be the
same as those used in reports for the same aerodrome.
3.2 Amendments to forecasts for take-off
Recommendation.- The criteria for the issuance of
amendments for forecasts for take-off for sutj5ace wind
direction and speed, temperature and pressure and any other
elements agreed locally should be agreed between the
meteorological authoriry and the operators concerned. The
criteria should be consistent with the corresponding criteria
.for special reports established for the aerodrome in accordance
with Appendix 3, 2.3. I .
4. CRITERIA RELATED TO AREA AND
ROUTE FORECASTS, OTHER THAN
FORECASTS ISSUED WITHIN THE FRAMEWORK
OF THE WORLD AREA FORECAST SYSTEM
4.1 Format of area and route forecasts
4.1.1 Area and route forecasts and amendments thereto,
disseminated locally, shall be in one of the forms prescribed
for the exchange of such information between meteorological
offices or in another form as agreed locally.
4.1.2 Route forecasts and amendments thereto which are
exchanged between meteorological offices shall be in the
ROFOR code form prescribed by the World Meteorological
Organization.
Note.- The ROFOR code form is contained in WMO
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