If significant weather is expected, what abbreviation would be used in the TAF?

In Terminal Aerodrome Forecasts (TAF), the abbreviation used to indicate significant weather phenomena is "WS," which stands for "significant weather." This abbreviation signifies that significant weather such as thunderstorms, heavy precipitation, or other notable meteorological events are expected to occur during the forecast period. It alerts pilots and other aviation personnel to pay attention to these potentially hazardous conditions.

The other options represent different weather phenomena: "SW" typically refers to a wind direction from the southwest, "SE" is used for southeast winds, and "SS" signifies sandstorm conditions. While these elements are important in meteorology and aviation, they do not directly indicate significant weather events in a TAF context. "WS" is specifically designated for significant weather, making it the correct choice in this scenario.