134 / 476
124
SIGNIFICANTABBREVIATIONS (AIPGEN 3.5)
In reports, terminal forecasts and low level area forecasts, the amount of
cloudwill be indicated by the following abbreviations:
NCD Nil CloudDetected (in fullyautomated reports only)
SKC
SkyClear
FEW
Few
1 to 2OKTAS
SCT
Scattered
3 to 4OKTAS
BKN
Broken
5 to 7OKTAS
OVC
Overcast
8OKTAS
NSC Nil Significant Cloud
CAVOK Cloud andvisibilityOK
Theonly cloud type that are included in aeronautical code format are towering
cumulus (TCU) and cumulonimbus (CB). Forecasts innarrative form, such
as low level area forecasts, will include cloud types other thanCB and
TCUwhen appropriate; and in the case of CB and TCU, the amountwill be
indicated as follows:
ISOL
isolated
for individual CBs
OCNL occasional
forwell-separatedCBs
FREQ frequent
for CBswith littleor no separation
EMBD embedded embedded in layers of other cloud
GOOD
is used in the visibility section of low level area forecasts to indicate
a visibility greater than10 kmover the entire area.Whenweather elements
are forecast to reduce the visibility below 10 km,
GOOD
is replacedby those
elements and their associated visibilities. Note that the visibility remains
greater than 10 km in parts of the area unaffected by those elements.
2 – me t eorology
forecasts and reports