Acronyms: O's

OAC	Oceanic area control center
OAT	Outside Air Temperature OBND
OBS	Observe or observe or observation
OBSC	Obscure or obscured or obscuring
OBSCD	Obscured
OBSCG	Obscuring
OBST	Obstacle
OCFNT	Occluded front
OCLD	Occlude
OCLDD	Occluded
OCLDG	Occluding
OCLDS	Occludes
OCLN	Occlusion
OCNL	Occasional or occasionally
OCNLY	Occasionally
OCR	Occur
OCRD	Occurred
OCRG	Occurring
OCRS	Occurs
OCT	October
OFC	Office
OFF	Offshore Forecast
OFP	Occluded frontal passage
OFSHR	Offshore
OH	Ohio or Office of Hydrology, located in Silver Spring, MD.
OHD	Overhead
OHP	One-Hour Rainfall Rate
OK	Oklahoma
OML	Operations Manual Letter
OMTNS	Over mountains
ONSHR	Onshore
OPA	Opaque, white type of ice formation
OPMET	Operational meteorological (information)
OPN	Open or opening or opened
OPR	Operator or operate or operative or operating or operational
OPS	Operations
OR	Oregon
ORGPHC	Orographic
ORIG	Original
OSV	Ocean station vessel
OTLK	Outlook
OTP	On top
OTR	Other
OTRW	Otherwise
OUBD	Outbound
OUTFLO	Outflow
OVC	Overcast
OVNGT	Overnight
OVR	Over
OVRN	Overrun
OVRNG	Overrunning
OVTK	Overtake
OVTKG	Overtaking
OVTKS	Overtakes

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