JPATS Weather - NETC

JPATS AVIATION WEATHER BOOKLET
FEW011 BKN040 OVC120 — Few clouds (1/8 to 2/8) at 1100 feet AGL, broken clouds (5/8 to
7/8) at 4000 AGL, overcast clouds (8/8) at 12,000 feet AGL.
Group 9: Temperature/Dew Point
Temperature and dew point are reported as two 2-digit groups, rounded to the nearest whole
degree Celsius, and separated with a (/) (Figure 6-11). Sub-zero temperatures or dew points will
be prefixed with the letter “M” (for Minus). If the temperature and dew point are not available,
the entire group is omitted. If only dew point is unavailable, then only temperature is coded,
followed by the (/).
METAR KNPA 082255Z 27004KT 7/8SM R04/4500FT DZ FG SCT000 BKN011 OVC380
19/18 A2997 RMK VIS1/2V1 CIG009V013 FG SCT000 BKN TOPS 027 SLP149
Figure 6-11 — Temperature and Dew Point in METAR
If necessary, convert between Fahrenheit and Celsius using the following formulas:
F = (C * 9/5) +32 C = (F - 32) * 5/9 (9/5 = 1.8)
or by using the conversion scale on the CR-2 circular slide rule.
Group 10: Altimeter Setting
The altimeter setting will be included in all reports. The altimeter group always starts with the
letter “A”, and will be followed with a 4-digit group using the tens, units, tenths, and hundredths
of inches of mercury. For example, A2992 indicates an altimeter setting of 29.92 inches of Hg
(Figure 6-12).
METAR KNPA 082255Z 27004KT 7/8SM R04/4500FT DZ FG SCT000 BKN011 OVC380
19/18 A2997 RMK VIS1/2V1 CIG009V013 FG SCT000 BKN TOPS 027 SLP149
Remarks Section
Figure 6-12 — Altimeter Setting in METAR
Remarks will be included in all METAR/SPECI reports if deemed appropriate. They will be
separated from the body of the report by a space and the abbreviation RMK. If there are no
remarks, then “RMK” is omitted (Figure 6-13). The remarks fall into three major categories, (1)
Manual and Automated remarks, (2) Plain language remarks, and (3) Additive data and
Maintenance remarks. Only the first two will be discussed in this chapter, as the last is of very
little importance to an aviator.
METAR KNPA 082255Z 27004KT 7/8SM R04/4500FT DZ FG SCT000 BKN011 OVC380
19/18 A2997 RMK VIS1/2V1 CIG009V013 FG SCT000 BKN TOPS 027 SLP149
Figure 6-13 — Remarks Section of METAR
Remarks are made in accordance with the following conventions.
A. Where plain language is called for, authorized abbreviations and symbols are used to
conserve time and space.
6-10 Version 3.2/Dec 08