I was on an IFR arrival into Houston a while ago with busy Approach Control, when I heard the following exchange: Approach Control: "N1234 say altitude
When asked to say altitude
, the pilot advised he was at 11,500 and climbing.
The researchers say altitude
is the key: the high-pressure system is much taller than the surrounding clouds and thus more exposed to the Sun's UV rays.
We've seen it before: In busy controlled airspace, ATC asks the pilot to say altitude
, followed by a directive to turn off the Mode C.
Well, we're not receiving your transponder, sir; turn right 90 degrees for radar identification and say altitude
Atlanta Center: "Cessna Six Two Niner Three Five, say altitude