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obscuring phenomenon precedes the amount of
obscuration and three zeros.
EXAMPLEBKN000
(IN BODY) - “sky partially obscured.”
FU BKN000 (IN REMARKS) - “smoke obscuring five- to
seven-eighths of the sky.”
30.3.9.6 When sky conditions include a layer aloft
other than clouds, such as smoke or haze, the type of
phenomena, sky cover, and height are shown in
remarks.
30 AUG 07
AIP
United States of America
GEN 3.5-64
15 MAR 07
Nineteenth Edition Federal Aviation Administration
EXAMPLEBKN020
(IN BODY) - “ceiling two thousand broken.”
RMK FU BKN020 - “broken layer of smoke aloft, based at
two thousand.”
30.3.9.7 Variable Ceiling. When a ceiling is below
three thousand and is variable, the remark “CIG” will
be shown followed with the lowest and highest
ceiling heights separated by a “V.”
EXAMPLECIG
005V010 - “ceiling variable between five hundred
and one thousand.”
30.3.9.8 Second Site Sensor. When an automated
station uses meteorological discontinuity sensors,
remarks will be shown to identify site specific sky
conditions which differ and are lower than conditions
reported in the body.
EXAMPLECIG
020 RY11 - “ceiling two thousand at Runway One
One.”
30.3.9.9 Variable Cloud Layer. When a layer is
varying in sky cover, remarks will show the
variability range. If there is more than one cloud
layer, the variable layer will be identified by
including the layer height.
EXAMPLESCT
V BKN - “scattered layer variable to broken.”
BKN025 V OVC - “broken layer at two thousand five
hundred variable to overcast.”
30.3.9.10 Significant Clouds. When significant
clouds are observed, they are shown in remarks,
along with the specified information as shown below:
a) Cumulonimbus (CB), or Cumulonimbus Mammatus
(CBMAM), distance (if known), direction
from the station, and direction of movement, if
known. If the clouds are beyond 10 miles from the
airport, DSNT will indicate distance.
EXAMPLECB
W MOV E - “cumulonimbus west moving east.”
CBMAM DSNT S - “cumulonimbus mammatus distant
south.”
b) Towering Cumulus (TCU), location, (if
known), or direction from the station.
EXAMPLETCU
OHD - “towering cumulus overhead.”
TCU W - “towering cumulus west.”
c) Altocumulus Castellanus (ACC), Stratocumulus
Standing Lenticular (SCSL), Altocumulus
Standing Lenticular (ACSL), Cirrocumulus Standing
Lenticular (CCSL) or rotor clouds, describing the
clouds (if needed), and the direction from the station.
ACC W “altocumulus castellanus
west”
ACSL SW-S “standing lenticular
altocumulus southwest
through south”
APRNT ROTOR CLD S “apparent rotor cloud
south”
CCSL OVR E “standing lenticular
cirrocumulus over the
east”
30.3.10 Temperature/Dew Point. Temperature
and dew point are reported in two, two-digit groups
in degrees Celsius, separated by a solidus (/).
Temperatures below zero are prefixed with an “M.”
If the temperature is available but the dew point is
missing, the temperature is shown followed by a
solidus. If the temperature is missing, the group is
omitted from the report.
EXAMPLE-
15/08 . . . . . . . . “temperature one five, dew point 8”
00/M02 . . . . . . . “temperature zero, dew point minus 2”
M05/ . . . . . . . . . “temperature minus five, dew point
missing”
30.3.11 Altimeter. Altimeter settings are reported
in a four-digit format in inches of mercury prefixed
with an “A” to denote the units of pressure.
EXAMPLEA2995
. . . . . . . . “altimeter two niner niner five”
30.3.12 Remarks. Remarks will be included in all
observations, when appropriate. The contraction
“RMK” denotes the start of the remarks section of a
METAR report.
Location of a phenomena within 5 statute miles of the
point of observation will be reported as at the station.
Phenomena between 5 and 10 statute miles will be
reported in the vicinity, “VC.” Phenomena beyond
10statute miles will be shown as distant, “DSNT.”
Distances are in statute miles except for automated
lightning remarks which are in nautical miles.
Movement of clouds or weather will be indicated by
the direction toward which the phenomena is moving.
30 AUG 07
AIP
United States of America
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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