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following values: 1 500,3 200 or 5 000 m.
SPEC1 is issued when the runway visual range is improving and changes to or passes through one
or more of the following values, or when the runway visual range is deteriorating and passes
through one or more of the following values: 400 or 800 m.
SPECI concerning the onset or cessation of ice crystals is not issued.
SPECI is issued when the height of base of the lowest cloud layer of BKN or OVC extent is lifting
and changes to or passes through one or more of the following values, or when the height of base
of the lowest cloud layer of BKN or OVC extent is lowering and passes through one or more of
the following values: 30, 180 or 450 m.
SPECI is issued when the sky is obscured and the vertical visibility is improving and changes to or
passes through one or more of the following values, or when the vertical visibility is deteriorating
and passes through one or more of the following values: 30, 180 or 450 m.
4.1.3.1 In local routine and special reports, an averaging period for surface wind observation is 10 minutes.
4.1.4.2 b) 1) In local routine and special reports and in METAR and SPECI, variations of wind direction are
given if the total variation is 60" or more with mean wind speeds above 6 kmlh (3 kt).
b) 2) In local routine and special reports and in METAR and SPECI, wind direction is indicated as
b) 3) "VRB" when a variation of wind direction is 60" or more with mean wind speeds below 6 km/h
(3 kt).
* Recommended Practice
4.7.3.2
APPENDIX 6
1.1.4
In local routine and special reports, when a wind speed of 200 kmth (100 kt) or more is reported, it
is indicated as it is.
In local routine and special reports and in METAR and SPECI, visibility is expressed in steps of
100 m even when the visibility is less than 800 m. It is indicated as it is, regardless of whether its
value is 10 km or more. In local routine and special reports, the abbreviation "CAVOK" is not
used.
When the visibility is not the same in different directions, the visibility explained by 1) or 2) or 3)
below and its general direction in relation to the aerodrome indicated by reference to one of the
eight points of the compass are reported in addition to the prevailing visibility.
1) The visibility, whose value is twice the prevailing visibility or more, is observed when the
prevailing visibility is 5 000 m or less.
2) The visibility, whose value is 50 per cent of the prevailing visibility or less, is observed when
the prevailing visibility is 5 000 m or less.
3) The visibility, whose value is 5 000 m or less than 50 per cent of the prevailing visibility, is
observed when the prevailing visibility is more than 5 000 m.
In local routine and special reports, the averaging period for runway visual range values is
10 minutes.
In METAR and SPECI, the runway visual range is based on the light intensity actually in use on
that runway.
The reporting scale consists of increments of 50 m for runway visual range below 800 m and
increments of 100 m for above 800 m.
The upper limit for runway visual range is 1 800 m.
When a thunderstorm is observed, it is reported as "TS" regardless of its location. When a funnel
cloud is observed, it is reported as "VCFC" regardless of its location.
The height of the base of cloud is reported in steps of 30 m (100 ft) up to 1 500 m (5 000 ft), in
steps of 300 m (1 000 ft) between 1 500 m (5 000 ft) and 9 000 m (30 000 ft) and in steps of
1 500 m (5 000 ft) above 9 000 m (30 000 ft).
In local routine and special reports, the abbreviations "CAVOK and "NSC are not used. If there
are no clouds of operational significance, no cumulonimbus and no restriction on vertical visibility
and if "SKC" is not appropriate, types of clouds are reported.
In local routine and special reports, QFE is not reported.
SIGMET information concerning thunderstorms (OBSC TS, OBSC/EMBD/FRQ/SQL TS), icing
(SEV ICE (FZRA)), mountain waves (SEV MTW), duststorms (HVY DS) and sandstorms (HVY
SS) is not issued.
* Recommended Practice
15/6/05
SUPPLEMENTTO ANNEX3 (FIFTEENTHE DITION) LATVIA I
CHAPTER 4
4.4.2 b) SPEC1 reports are not issued.
4.4.3
Remark: In accordance with EUR ANP.
4.6.2.1 Definition of prevailing visibility is not applicable.
4.6.2.3* For METAR reports, the visibility observations are representative of the touchdown zone of the
runway.
CHAPTER 5
5.2 a)
CHAPTER 6
6.2.1
Routine aircraft observations during en-route and climb-out phases of the flight are not made.
Aerodrome forecasts for Ventspils aerodrome are not issued.
Remark: No requirements from operators. Compliance is expected by 2008.
　
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