Which weather sources are used?

• A. NWS WSI and EWINS
• B. NWS and EWINS
• C. NOAA and EWINS
• D. METAR and TAF

Answer: (A)

Weather data for planning comes from multiple sources, combining official government data with commercial feeds and integrated distribution. The National Weather Service provides authoritative forecasts and observations, while Weather Services International delivers commercial, aviation-focused weather data and decision-support tools. EWINS represents a weather information network that brings together inputs from these providers for delivery to users. Together, NWS, WSI, and EWINS cover official data, commercial enhancements, and integrated dissemination, which is why this combination is the best fit. METAR and TAF are formats for weather reports and forecasts, not sources of data, and NOAA is the umbrella agency rather than the specific source name used in this context.