Weather decisions begin before departure and continue throughout a flight. A useful plan connects the available information with the pilot’s qualifications, the aircraft’s limitations and realistic alternatives. This article introduces the subject; it is not a procedure for penetrating hazardous weather or conducting a particular flight.
Build a complete picture
Use an appropriate briefing and examine observations, forecasts and hazards relevant to the route and time of flight. A METAR describes observed conditions at a reporting location, while a TAF is a forecast for an airport area and period. Neither alone describes every point along a route.
The FAA Aviation Weather Handbook explains products and weather processes. Learn each product’s coverage, issue time and limitations instead of relying on the color or headline in a single app.
Match the plan to the flight
Consider terrain, alternates, fuel planning, aircraft equipment and the limits that apply to your operation. Personal minimums should be developed with appropriate instruction and experience. A forecast meeting a regulatory minimum does not automatically make a flight suitable for a particular pilot or aircraft.
Build options into the plan: a different departure time, route or destination, or remaining on the ground. Make those decisions while there is time to evaluate them rather than treating a deteriorating situation as a test of determination.
Understand cockpit weather delays
Datalink radar imagery can be delayed by collection, processing and transmission. A display’s apparent age does not necessarily represent the age of every observation in the image. It should not be used to pick a close path between thunderstorm cells as though it were a live view.
The FAA’s weather information guidance explains these limitations and broader sources of weather information. Use equipment according to its approved purpose, training and operator procedures.
Good weather judgment combines information with conservative options and timely decisions. Knowing when the plan no longer fits the conditions is as important as knowing how to read a forecast.