| 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 Springs, 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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