Significant weather (SIGWX) charts are issued for which flight levels?

FL100 to FL450 (high-level) and SFC to FL100/FL240 (low/medium-level)

Correct

Surface to FL100 only

FL450 and above only

Only for oceanic routes

Explanation

SIGWX charts are produced for high level (FL100-FL450 or FL250-FL630) and low/medium level, depicting hazards such as CB, turbulence, icing, jet streams, and fronts.

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