FAA Aircraft Dispatcher (ADX)MeteorologyHard
A dispatcher reviewing weather radar reflectivity data notes several thunderstorm cells classified as VIP (Video Integrator Processor) Level 4. According to FAA guidance, what minimum lateral clearance should be maintained from these cells due to the potential for severe turbulence and hail?
- A5 nautical miles
- B50 nautical miles
- C10 nautical miles
- D20 nautical miles
Show answer & explanationAnswer & explanation
Correct answer: D. 20 nautical miles
FAA guidance (AC 00-24) recommends avoiding thunderstorm cells identified as VIP Level 3 or greater by at least 20 nautical miles, especially near the top of the storm or downwind of it, due to the potential for severe turbulence, hail, and lightning associated with these intense reflectivity levels.
Why the other options are wrong
- A. Too close a distance for a VIP Level 4 cell per FAA guidance.
- B. Exceeds the standard recommended distance, though not incorrect to be more cautious, it is not the published guidance figure.
- C. Still insufficient clearance for a strong echo intensity level.
VIP Radar Reflectivity Levels
A 6-level scale (VIP 1-6) categorizing radar echo intensity from light to extreme, used to assess thunderstorm hazard severity for flight planning.
- Levels 1-2: light to moderate precipitation, minimal hazard
- Levels 3-6: heavy to extreme, associated with severe turbulence and hail
- FAA recommends 20 NM lateral clearance from cells VIP Level 3 or greater
Memory trick: Level 3 and up? Stay 20 NM away, no exceptions.