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Aeronautical Information Manual (AIM), page 508

Index   507 -- Page 508 -- 509

7110.65R
AIM CHG 2



(j) Significant clouds. When significant
clouds are observed, they are shown in remarks,
along with the specified information as shown below:
(1) Cumulonimbus (CB), or Cumulonim-
bus 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.
EXAMPLE-
CB W MOV E . . . . . . . "cumulonimbus west moving
east"

CBMAM DSNT S . . . . "cumulonimbus mammatus
distant south"


(2) Towering Cumulus (TCU), location, (if
known), or direction from the station.
EXAMPLE-
TCU OHD . . . . . . . . . "towering cumulus overhead"
TCU W . . . . . . . . . . . . "towering cumulus west"

(3) Altocumulus Castellanus (ACC), Stra-
tocumulus Standing Lenticular (SCSL),
Altocumulus Standing Lenticular (ACSL), Cirrocu-
mulus Standing Lenticular (CCSL) or rotor clouds,

describing the clouds (if needed) and the direction

from the station.

EXAMPLE-
ACC W . . . . . . . . . . . . . "altocumulus castellanus west"
ACSL SW-S . . . . . . . . . "standing lenticular
altocumulus southwest
through south"

APRNT ROTOR CLD S "apparent rotor cloud south"
CCSL OVR MT E . . . . . "standing lenticular
cirrocumulus over the
mountains east"
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"
3/15/07
5/26/16
12/10/15

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.
EXAMPLE-
A2995 - "Altimeter two niner niner five"
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.
Except for precipitation, phenomena located 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."
Precipitation not occurring at the point of observation
but within 10 statute miles is also reported as in the
vicinity, "VC." Phenomena beyond 10 statute 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.

(a) There are two categories of remarks:

(1) Automated, manual, and plain

language.

(2) Additive and automated maintenance

data.
(b) Automated, Manual, and Plain Lan-
guage. This group of remarks may be generated

from either manual or automated weather reporting

stations and generally elaborate on parameters
reported in the body of the report. (Plain language
remarks are only provided by manual stations).
(1) Volcanic eruptions.

(2) Tornado, Funnel Cloud, Waterspout.

(3) Station Type (AO1 or AO2).

(4) PK WND.

(5) WSHFT (FROPA).

(6) TWR VIS or SFC VIS.

(7) VRB VIS.

(8) Sector VIS.
(9) VIS @ 2nd Site.

(10) (freq) LTG (type) (loc).

7-1-64 Meteorology

Page 508 of the Aeronautical Information Manual (AIM.pdf)
AIM: Official Guide to Basic Flight Information and ATC Procedures

Index   507 -- Page 508 -- 509