Which chart is updated four times a day and provides wind and temperature forecasts aloft?

The chart that is updated four times a day and provides wind and temperature forecasts aloft is the FB - Winds and Temperatures Aloft Forecast. This chart specifically indicates the forecasted wind speeds and directions as well as temperatures at various altitudes, helping pilots and meteorologists assess conditions at higher levels of the atmosphere. Its updates are synchronized with regular aviation forecasts, making it a critical resource for flight planning and operations.

The other options serve different purposes in weather analysis and forecasting. The Radar Summary Chart primarily presents information on precipitation and storm activity based on radar data, while the Surface Analysis Chart depicts conditions at the Earth's surface, including pressure systems and weather fronts, rather than aloft. The TAF (Terminal Aerodrome Forecast) focuses on expected weather conditions at specific airports, generally within a 24 to 30-hour timeframe, and is more concerned with surface weather rather than aloft conditions. Thus, the FB - Winds and Temperatures Aloft Forecast is the most appropriate and specialized chart for wind and temperature forecasts at higher altitudes.