How would the observation of a thunderstorm from 0307z to 0328z be encoded?

The encoding of the thunderstorm observation from 0307z to 0328z needs to be understood in the context of the timing and duration of the event. In the coding system, "TS" denotes the presence of a thunderstorm. Following this, the duration and timing details must be encapsulated correctly.

In this case, the "07" component indicates the beginning of the thunderstorm observation at 0307z. The "E28" signifies the observation lasted until 0328z, which equates to a duration of 21 minutes. Therefore, the notation reflects the start time of the thunderstorm and the end time appropriately.

This encoding format ensures clarity and precision in reporting, crucial for aviation weather assessments. The correct answer succinctly summarizes both the initiation and duration of the observed phenomenon.