Altimeter Ceiling Visual Flight Rules 
Pilot Institute
APRIL 24, 2024
They try to make the underlying airspace easily navigable by visual flight rules (VFR) aircraft. This central core extends up to around 10,000 feet MSL, the airspace’s ceiling. However, the ceiling for each shelf is the same as the core. The shelves extend outwards from the core.
AeroSavvy
JANUARY 16, 2024
Green – VFR ( Visual Flight Rules ) Ceiling > 3,000 ft. C ( 12°F)/-11.0°C C ( 12°F) Remark: Very light icing In other words, typical gorgeous day atop Mt. Washington! Years ago, when we first had access to live, inflight METARs, I would have fun with my first officers by pulling up Mt Washington’s METAR.
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