OCNL

AcronymDefinition
OCNLOccasional (weather forecasts)
OCNLOntorion Controlled Natural Language
OCNLOregon Coastal Natural Lake
References in periodicals archive ?
Some of the changes to the AIRMET text included the removal of OCNL or FRQ (for occasional or frequent), trend remarks such as CONDS SPRDG EWD (conditions spreading eastward), changes in intensity such as INTSF or WKN (intensifying or weakening), reasons for amendment or cancellation of the AIRMET, causes of turbulence, strong surface winds and low-level wind-shear potential, type of icing and location of icing with respect to clouds and precipitation.
Coastal events covering a large area may be captured by the area forecast, but the FA may simply say, "OCNL VIS 3-5SM," with no fog warning.