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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”
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”
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
5statute 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 Language.
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).
2/14/08 AIM
Meteorology 7-1-65
(11) Beginning/Ending of Precipitation/
TSTMS.
(12) TSTM Location MVMT.
(13) Hailstone Size (GR).
(14) Virga.
(15) VRB CIG (height).
(16) Obscuration.
(17) VRB Sky Condition.
(18) Significant Cloud Types.
(19) Ceiling Height 2nd Location.
(20) PRESFR PRESRR.
(21) Sea-Level Pressure.
(22) ACFT Mishap (not transmitted).
(23) NOSPECI.
(24) SNINCR.
(25) Other SIG Info.
(c) Additive and Automated Maintenance
Data.
(1) Hourly Precipitation.
(2) 3- and 6-Hour Precipitation Amount.
(3) 24-Hour Precipitation.
(4) Snow Depth on Ground.
(5) Water Equivalent of Snow.
(6) Cloud Type.
(7) Duration of Sunshine.
(8) Hourly Temperature/Dew Point
(Tenths).
(9) 6-Hour Maximum Temperature.
(10) 6-Hour Minimum Temperature.
(11) 24-Hour Maximum/Minimum
Temperature.
(12) Pressure Tendency.
(13) Sensor Status.
PWINO
FZRANO
TSNO
RVRNO
PNO
VISNO
Examples of METAR reports and explanation:
METAR KBNA 281250Z 33018KT 290V360
1/2SM R31/2700FT SN BLSN FG VV008 00/M03
A2991 RMK RAE42SNB42
METAR . . . . . . aviation routine weather
report
KBNA . . . . . . . . Nashville, TN
281250Z . . . . . . date 28th, time 1250 UTC
(no modifier) . . This is a manually generated
report, due to the absence of
“AUTO” and “AO1 or AO2”
in remarks
33018KT . . . . . wind three three zero at one
eight
290V360 . . . . . . wind variable between
two nine zero and three six
zero
1/2SM . . . . . . . . visibility one half
R31/2700FT . . . Runway three one RVR two
thousand seven hundred
SN . . . . . . . . . . . moderate snow
BLSN FG . . . . . visibility obscured by
blowing snow and fog
VV008 . . . . . . . indefinite ceiling eight
hundred
00/M03 . . . . . . . temperature zero, dew point
minus three
A2991 . . . . . . . . altimeter two niner niner one
RMK . . . . . . . . remarks
RAE42 . . . . . . . rain ended at four two
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