What are the recommended weather information sources for flight planning as described in the AIM?

• A. METARs and TAFs for current and forecast weather, winds aloft for altitude winds, area forecasts, pireps, NOTAMs, and other aviation weather products.
• B. Only METARs and winds aloft.
• C. Weather radar and satellite imagery only.
• D. Area forecasts only.

Answer: (A)

Flight planning requires using a broad mix of weather information sources described in the AIM to form a complete picture of what you’ll encounter. METARs provide current observed weather at airports, while TAFs give the forecast for those same locations, giving you both present conditions and near-term expectations. Winds aloft tell you how the wind behaves with altitude, which directly affects climb, cruise, descent, and fuel planning. Area forecasts extend that outlook to a larger region, helping you anticipate conditions between points you’ll fly through. PIREPs offer real-time in-flight reports from other pilots, validating or updating forecast trends with actual observed conditions. NOTAMs alert you to weather-related notices or hazards that could impact routing, usable airspace, or airport operations. Other aviation weather products—such as SIGMETs, AIRMETs, convective outlooks, and radar/satellite imagery—flag significant hazards and short-term weather developments.

Using all these sources together provides the most reliable basis for planning, rather than relying on any single source.