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A terminal radar approach control has neither NEXRAD nor WARP, so weather radar echoes are displayed by the Airport Surveillance Radar (ASR) systems using Common Automated Radar Terminal System (Common ARTS) or Standard Terminal Automation Replacement System (STARS) digital weather processors. Paired with a weather processor, digitized ASR 9 and 11 systems display the four weather radar echo intensity categories to the controller.

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Terminal radar approach control facilities can, and do, display “light” (less than 30 dBZ) areas of precipitation.  Not all terminal facilities have digitized systems, however, and systems without digital processors cannot discern radar echo intensity. In these cases, ATC can describe the position of weather radar echoes, but will state “intensity unknown” instead of using the terms, “light,” “moderate,” “heavy,” or “extreme.” 

A critical element in interpreting weather information from ATC is a thorough understanding of pilot-controller communications.  Be sure to review the AIM Pilot/Controller Glossary, and clarify points you do not understand.
Datalink and Weather Avoidance Equipment. When analyzing this information, it is vital to remember that the quality of the information depends heavily upon update rate, resolution, and coverage area.  When flying an aircraft that has datalink equipment, safe and accurate interpretation of the information you receive depends on your understanding of each of these parameters.  
Datalink does not provide real-time information.  Although weather and other

navigation displays can give pilots an unprecedented quantity of high quality weather data, their use is safe and appropriate only for strategic decision making (attempting to avoid the hazard altogether). Datalink is not accurate enough or current enough to be safely used for tactical decision making (negotiating a path through a weather
hazard area, such as a broken line of thunderstorms).  
Be aware that onboard weather equipment can inappropriately influence your decision to continue a flight. No matter how “thin” a line of storms appears to be, or how many “holes” you think you see on the display, it is not safe to fly through them.
Perform – Putting It All Together
In the preflight planning process, you used weather data and analysis to develop a strategic, “big picture” weather flying plan.  During the en route phase, use the data and analysis to make tactical weather decisions.  Good tactical weather flying requires you to perceive the conditions around you, process (interpret) their impact on your flight, and perform by taking appropriate action at each stage.  
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DO reassess the weather on a continuous basis.  Designate specific fixes (e.g., airports) on or near your flight path as “weather check” checkpoints and use one of the in-flight resources described above to get updated information.  
　
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本文链接地址：General Aviation Pilot’s Guide to Preflight Weather Planning, Weather Self-Briefings, and Weather Decision Making(15)