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An outflow boundary from a dissipating thunderstorm can remain active for hours and can:
A.
Be safely overflown at 5,000 feet AGL — outflow boundaries only affect surface operations
B.
Trigger new thunderstorm development by acting as a mini cold front, lifting warm moist air — pilots should treat it as a significant hazard even with no storm visible above
C.
Only affect IFR aircraft — VFR operations are exempt from outflow boundary hazards
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