What does "WSHFT 30 FROPA" mean in a weather report?

The phrase "WSHFT 30 FROPA" in a weather report indicates a wind shift at an altitude of thirty degrees due to the passage of a front, which corresponds to atmospheric frontal systems that can influence wind patterns. When conditions change as a front moves through, the winds can shift direction and speed, which is crucial information for air traffic control and pilots. This data helps them understand potential changes in flight conditions, allowing for better preparation and planning. The reference to "30" suggests it is measured at a specific altitude or level. Recognizing wind shifts is important for maintaining safe and efficient flight operations.