Metro-02
Meteorology and Flight Planning
e.
Significant Present Weather
(1) TSRA (Thunderstorm/Moderate Rain)
Format is a 2-character descriptor
(e.g., TS, SH, DR) sometimes followed by a
2-character weather phenomenon
(e.g., RA, SN, FG)
(2) Intensity or proximity of weather
phenomenon:
(a) "-" -- Light
(b) "+" -- Heavy
(c) "no sign" -- Moderate
(d) "VC" -- in the vicinity
f.
Clouds
(1) OVC010CB -- specifies cloud amount,
height, and type. Overcast clouds are
present at 1,000 ft consisting of
cumulonimbus clouds
(2) Cloud height is reported in hundreds of
feet. When clouds are composed of
towering cumulus or cumulonimbus, TCU
or CB will follow cloud height
(3) Clouds are categorized based on eighths
(octas) of the sky
(a) SKC -- Sky clear
(b) FEW -- >0-2 octas
(c) SCT -- 3-4 octas
(d) BKN -- 5-7 octas
(e) OVC -- 8 octas
(7-97) Original
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