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For checklist questions and weather analysis worksheets to help you analyze the impact of these weather elements on your specific flight, see Appendix 6 (VFR) and Appendix 7 (IFR).
Perform – Making a Weather Plan
The third step in practical preflight weather planning is to perform an honest evaluation of whether your skill and/or aircraft capability are up to the challenge posed by this particular set of weather conditions.  It is very important to consider whether the combined “pilot-aircraft team” is sufficient.  For example, you may be a very experienced, proficient, and current pilot, but your weather flying ability is still limited if you are flying a 1980s-model aircraft with no weather avoidance gear. On the other hand, you may have a new technically advanced aircraft with moving map GPS, weather datalink, and autopilot – but if you do not have much weather flying experience, you must not count on the airplane’s capability to fully compensate for your own lack of experience.  You must also ensure that you are fully proficient in the use of onboard equipment, and that it is functioning properly.
One way to “self-check” your decision (regardless of your experience) is to ask yourself if the flight has any chance of appearing in the next day’s newspaper.  If the result of the evaluation process leaves you in any doubt, then you need to develop safe alternatives.
Think of the preflight weather plan as a strategic, “big picture” exercise.  The goal is to ensure that you have identified all the weather-related hazards for this particular flight, and planned for ways to eliminate or mitigate each one.  To this end, there are several items you should include in the weather flying plan:
Escape Options:  Know where you can find good weather within your aircraft’s range and endurance capability. Where is it? Which direction do you turn to get there? How long will it take to get there?  When the weather is IMC (ceiling 1,000 or less and visibility 3 nm or less), identify an acceptable alternative airport for each 25-30 nm segment of your route.  The worksheets in Appendices 5, 6, and 7 include space to record some of this information.
Reserve Fuel:  Knowing where to find VFR weather does you no good unless you have enough fuel to reach it. Flight planning for only a legal fuel reserve could significantly limit your options if the weather deteriorates.  More fuel means access to more alternatives.  Having plenty of fuel also spares you the worry (and distraction) of fearing fuel exhaustion when weather has already increased your cockpit workload.
Terrain Avoidance: Know how low you can go without encountering terrain and/or obstacles. Consider a terrain avoidance plan for any flight that involves:
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Weather at or below MVFR (ceiling 1,000 to 3,000; visibility 3 to 5 miles)

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A temperature/dew point spread of 4° C. or less;
　
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本文鏈接地址：General Aviation Pilot’s Guide to Preflight Weather Planning, Weather Self-Briefings, and Weather Decision Making(9)