Definition
A pilot report (PIREP) describing the altitude of the top of a cloud layer, given as the height in feet above mean sea level (MSL) where the pilot broke out of the clouds into clear air above.
Plain English
A pilot's report telling air traffic control and other pilots how high the cloud layer goes. It is the altitude where you climb out the top of the clouds and into clear sky.
Context Anchor
Seen in IFR clearances and discussions about climbing to or operating VFR-on-top.
Derivation
Top' here refers to the upper surface of a cloud layer -- the point where the cloud ends and clear air begins. A 'top report' is simply a report of that height.
Why Pilots Care
Allows ATC and other pilots to confirm safe separation above cloud tops and supports accurate altitude selection.
Grounding Statement
If the cloud layer ends at 6,500 feet, a top report lets the pilot know that clear conditions may be available above that height.
Intuition Check
Do not read “top report” as a general summary or a report from the top of an organization. In this context, “top” means the upper surface of a cloud or weather layer.
Example Sentence 1
After climbing through the overcast, the pilot gave a top report of 7,500 feet to ATC.
Example Sentence 2
ATC asked for a top report to verify the aircraft could maintain VFR-On-Top.