A report cannot be classified as COR if it:

The classification of a report as COR, which stands for "Corrected Observations," is critically tied to the timeliness of the observation. If a report is not timely, meaning it was not filed within the appropriate timeframe for the expected reporting period, it cannot be accurately classified as COR. Timeliness ensures that the data remains relevant and useful for current weather analysis and forecasting. Without adherence to this key requirement, the integrity of the report and its ability to inform decision-making is undermined. Therefore, the correct classification hinges significantly on the promptness of report submission.