Final answer:
BCM, PROB30, and FM on a TAF indicate specific meanings related to weather conditions.
Step-by-step explanation:
On a Terminal Aerodrome Forecast (TAF), the codes BCMG, PROB30, and FM have specific meanings:
- BCMG stands for "Becoming" and indicates a change in weather conditions that is expected to occur during the time period mentioned in the forecast. For example, BCMG SCT010 BKN050 would mean that the cloud cover is expected to change from scattered clouds at 1,000 feet to broken clouds at 5,000 feet.
- PROB30 stands for "Probability of 30%" and indicates the likelihood of a specific weather condition occurring. For example, PROB30 TSRA means that there is a 30% chance of thunderstorms with rain.
- FM stands for "From" and indicates the time when a change in weather conditions is expected to occur. For example, FM1400 means that the change is expected to happen at 1400 UTC (Coordinated Universal Time).