"Steven P. McNicoll" wrote in message
k.net...

"Stan Prevost" wrote in message
...

Where does the 1000 come from?


From FAR 91.155(c).


§ 91.155 Basic VFR weather minimums.

(c) Except as provided in §91.157, no person may operate an aircraft
beneath the ceiling under VFR within the lateral boundaries of controlled
airspace designated to the surface for an airport when the ceiling is less
than 1,000 feet.


That does not define VFR conditions and is not permissive about operating
below 1000 ft under VFR. One still has to obey airspace cloud clearance
rules.