Definition
A service in which Air Traffic Control, workload permitting, provides pilots with information about observed precipitation and thunderstorm activity, and may suggest headings or routes to help the pilot avoid hazardous weather. The pilot remains responsible for the final decision to deviate and for the safe operation of the aircraft.
Plain English
When ATC has the time and the radar information to help, controllers can tell pilots where the bad weather is and suggest a way around it. The pilot still decides whether to take that suggestion and is still in charge of flying the airplane safely.
Context Anchor
Seen in instrument flying when a pilot needs help avoiding thunderstorms, heavy precipitation, or other unsafe weather while already airborne.
Why Pilots Care
Allows safe deviation from planned routes without losing ATC separation or entering IMC hazards.
Grounding Statement
If the weather ahead looks unsafe or uncertain, ATC may help the pilot find a safer way around it, but the pilot still owns the decision.
Intuition Check
Do not read “assistance” as “ATC takes over the weather decision.” Here, assistance means ATC can help with information or routing when able; the pilot remains responsible for avoiding unsafe weather.
Example Sentence 1
Approaching a line of building cells, the pilot requested ATC inflight weather avoidance assistance and was given a suggested heading of 270 to get around the heaviest returns.
Example Sentence 2
Controllers issued a heading change as inflight weather avoidance assistance when the aircraft approached a line of thunderstorms.