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DO take action if you see or suspect deteriorating weather:

.  
Trust your eyes if you see weather conditions deteriorating.

.  
Contact EFAS for detailed information.

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Head for the nearest airport if you see clouds forming beneath your altitude, gray or black areas ahead, hard rain or moderate turbulence, or clouds forming above that require you to descend.  It is much easier to reevaluate conditions and make a new plan from the safety of an airport.

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DO contribute to the system by making pilot reports (PIREPS) when you call Flight Watch.  To learn more about making good PIREPS, take the Air Safety Foundation’s free online “Skyspotter” course.

ATC. If you need help from ATC in avoiding or escaping weather, ask sooner rather than later. Guidelines:

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DO be sensitive to ATC communications workload, but keep controllers advised of your weather conditions. Tell the controller if you need to deviate.

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DO remember that navigational guidance information issued to a VFR flight is advisory in nature. Suggested headings do not authorize you to violate regulations, and they are not guaranteed to keep you clear of all weather.

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DON’T hesitate to ask questions if you do not understand or if you are unsure.

.  
DON’T make assumptions about what the controller knows about your flight:

.  
If you need ATC’s help to avoid
convective weather, it never
hurts to remind the controller
that you have no onboard
weather avoidance equipment.  

.  
If you are handed off while on a suggested heading for weather avoidance, confirm that the next controller knows you are requesting weather avoidance assistance. For example, your initial call might be: “Center, N2817S, level 5,000, zero two zero heading for weather avoidance.”

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Never assume that “cleared direct when able” means that flying a direct course at that time will keep you clear of weather.  To ATC, “direct when able” means to fly direct when you are able to receive a signal and navigate directly to the fix. If you have any doubt, ASK whether a direct course will keep you clear of areas wit h moderate and heavy radar returns indicative of thunderstorm activity.

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Words such as “showers” and “precipitation” can be very misleading. Some pilots mistakenly assume that these words indicate areas of rain with no thunderheads present. In the world of ATC, weather radar echoes are all referred to as “precipitation.”  Do not proceed into areas of “showers” or “precipitation” without clarifyin g whether the level of precipitation is “light,” “moderate,” or “heavy.”  
　
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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(16)