github.com/maxp/metar-decoder - JavaScript routine to decode METAR data.
Function decode(metar_string) parses METAR data and returns following structure:
ts: timestamp :date
t: temperature Celsius degrees :int
d: dew point :int (t - xx)
p: pressure hPa (about 700-1400) :int
q: pressure (altimeter) hPa at sea level :int
w: wind m/s (0-100) :int
g: wind gust m/s (0-100) :int
b: wind bearing (0-359, VBR: 360) :int
vis: visibility m (0-9999) :int
vid: visibility direction [N,NE,E,SE,S,SW,W,NW]
vv: vertical visibility :int (in 30 m steps)
cl: [clouds, vertical visibility, type]
clouds in octas (SKC/CLR/NSC - 0, FEW - 2, SCT - 4, BKN - 7, OVC - 8) :int
vertical visibility (m) :int
type: CU = cumulus, CB = cumulonumbus, CI = cirrus, TCU = towering cumulus
# ?not supported: SC - stratocumuls, AC - altocumulus
clb: cloud base (m) :int
prw: [intencity, descriptor, precipitation, obscuration, other]
present weather -
http://www.ivao.aero/training/tutorials/metar/metar.htm
http://www.wunderground.com/metarFAQ.asp
http://ru.wikipedia.org/wiki/METAR
rwy: {NN: {dep:"XXXX", fc:"DD"}} - deposit and friction on each runway NN
flg: [list of flags]
icao: ICAO aeroport code
unk: [unknown METAR token list]
err: error message
Momentjs used for UTC date handling.
Runway state group coding (in flags):
Thunderstorm RETS
Freezing rain REFZRA
Freezing drizzle REFZDZ
Moderate or heavy rain RERA
Moderate or heavy snow RESN
Moderate or heavy drizzle REDZ
Moderate or heavy ice pellets REPL
Moderate or heavy snow grains RESG
Moderate or heavy showers of rain RESHRA
Moderate or heavy showers of snow RESHSN
Moderate or heavy shower of small hail RESHGS
Moderate or heavy showers of snow pellets RESHGS
Moderate or heavy showers of hail RESHGR
Moderate or heavy blowing snow REBLSN
Sandstorm RESS
Dust storm REDS
Funnel cloud REFC
Volcanic ash REVA