How long are carbon copies of MF1M-10 supposed to be retained?

The retention period for carbon copies of the MF1M-10 is 90 days. This duration is established to ensure there is sufficient time to review and verify the data recorded in these carbon copies, as they can be crucial for tracking weather observations and related analyses. Holding on to this documentation for 90 days allows for proper record-keeping, facilitating any necessary investigations into weather data anomalies or discussions that may arise during that time frame. This practice is not only a matter of following regulations but also supports the integrity of the data collected, which is vital for maintaining accurate weather records and ensuring accountability in weather observation practices.