MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
M maritime (air mass)
M in temperature field means "minus" or below zero (MEYAR)
M in RVR field, indicates Visibility less than lowest sensor value (M0600FT)
M missing (weather reports only)
M mountain standard time (time groups only)
MA map analysis
MAN Manitoba
MEGG merging
METAR Aviation routine Weather Report (ICAO)
MEX Mexico
MHKVLY Mohawk Valley
MI shallow (METAR)
MIFN midnight
MIFG patches of shallow fog no over two meters deep (METAR)
MLTLVL melting level
MMG main meteorological office
MNLD mainland
MOD moderate (PIREP)
MOGR moderate or greater
MONTR monitor
MOV move
MRGL marginal
MRNG morning
MRTM maritime
MS minus
MSTLY mostly
MSTR moisture
MTN mountain
MVFR marginal VFR
MX mixed icing type (PIREP)
MXD mixed
NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
NB New Brunswick
NCWX no change in weather
NELY northeasterly (weather reports only)
NERN northeastern
NEW ENG New England
NFLD Newfoundland
NGT night
NL no layer
NMBR number
NNERN north-northeastern (weather reports only)
NNEWD north-northeastward (weather reports only)
NNWRN north-northwestern (weather reports only)
NN
NO not available (e.g. SLPNO, RVRNO)
NORIP no pilot balloon observation unless weather changes significantly
NOSPL no special observations taken (weather reports only)
NPRS nonpersistent
NS nimbostratus
NS Nova Scotia
NSCSWD no small craft or storm warnings displayed
NSW no significant weather (TAF)
NVA negative vorticity avection
NWLY northwesterly (weather reports only)
NWRN northwestern (weather reports only)
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OBS observation
OBSC obscure
OCFNT occluded front
OCLD occlude
OCLN occlusion
OCNL occasional
OFP occluded frontal passage
OFSHR offshore
OMTNS over mountains
ONSHR on shore
ONT Ontario
ORGPHC orographic
OSV ocean station vessel
OTAS on top and smooth
OTLK outlook
OTP on top (PIREP)
/OV location (PIREP only)
OVC overcast
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P pacific standard time (time group only)
P polar (air mass)
P in RVR field (visibility greater than highest sensor value e.g. P6000FT)
P6SM visibility greater than 6 statute miles (TAF only)
PAC Pacific
PBL probable
PCPN precipitation
PDMT predominant
PDMT predominate
PDW priority delayed weather
PE ice pellets (METAR)
PEN peninsula
PGTSND Puget Sound
PIBAL pilot balloon observation
PISE no pilot balloon observation due to sea conditions
PISO no pilot balloon observation due to snow
PIWI no pilot balloon observation due to surface winds
PK WND peak wind
PL ice pellets (METAR)
PLW plow (snow)
PNHDL panhandle
PO dust/sand whirls (METAR)
PPINA radar weather report omitted for reason different than stated
PPINE radar weather report no echoes observed
PPINO no radar weather report due to breakdown
PPIOK radar weather reports resumed
PPIOM no radar weather reports due to maintenance
PR partial (METAR)
PRBLTY probability
PRESFR pressure falling rapidly
PRESRR pressure rising rapidly
PRFG fog partial (METAR)
PRJMP pressure jump (weather reports only)
PROB30 slight chance, probability 30 percent (TAF)
PROB40 probability 40 percent (TAF)
PROG prognosis or prognostic
PRSNT present
PS plus
PSG passage
PSG passing
PSR packed snow on runway
PTCHY patchy
PTLY partly
PVA positive vorticity avection
PWING precipitation identifier not available (weather reports only)
PY spray (METAR)
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QSTNRY quasi-stationary
QUE Quebec

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